Luminescent nanostructural composition ceramic material

FIELD: chemistry.

SUBSTANCE: invention relates to field of creating luminescent nanostructural composition ceramic materials on the basis of silicon dioxide and zinc orthosilicate (willemite) and can be applied in light-emitting and blinker devices development, for instance, plasma display panels, light matrix indicators, traffic lights, etc., which irradiate definite colour tone of visible spectrum. Luminescent nanostructural composition ceramic material, which contains silicon dioxide SiO2 and doped with manganese willemite Zn2SiO4, additionally contains zinc oxide ZnO, silicon dioxide representing crystobalite, willemite is doped with manganese by formula Zn2-xMnxSiO4, where variable x takes values in range from 0.05 to 0.15, material components are taken in following ratio: crystobalite - 45÷55 wt %, zinc oxide 5÷7 wt %, willemite 38÷50 wt %, cristobalite and zinc oxide grains size being in range from 55 to 70 nm, and sizes of willemite grains being in range from 10 to 22 nm.

EFFECT: created material has radiation of increased green light intensity in band 500÷570 nm, and allows increasing efficiency of glow centre excitation and increase quantum yield.

9 ex, 1 tbl, 1 dwg

 

The invention relates to the field of creation of luminescent nanostructured composite ceramic materials based on silicon dioxide and orthosilicate zinc (willemite) and can be used in the development of light-emitting and light-signaling devices (for example, plasma display panels, light dot matrix indicators, lights etc), emitting a specific color tone of the visible spectrum.

Nanostructured composite ceramic materials based on silicon dioxide, characterized by a large ratio of surface area to volume of the matrix and the specifics of the relationship between pore material, promising to create materials with luminescence in different parts of the spectrum of visible light. For example, known nanostructured silicon dioxide [Vscore, Appazaar, Suvorov, Ammersee, Y defects in nanostructured silicon dioxide. Solid-state physics, 2006, t, V, str÷1211]obtained in partially crystallized form by thermal decomposition polysilazane (600°C) and subsequent annealing (1400°C), luminesce in the visible range of the spectrum with maxima in the green and blue areas.

The disadvantage of this material is a wide range of wavelengths of luminescence, which reduces the efficiency of the phosphor when it is used for Faure is investing radiation in one of these regions of the spectrum.

In accordance with known measurements [Viyu, Gppgolf, Alamanov, Revkin, Bulletin of Sevkat, series of Physical-chemical", 2003, №1(7), p.79-84 (see also patent RF №1648167)] material Aerosil (dispersed amorphous silicon dioxide SiO2) luminesce with a maximum at 670 nm in the band 600÷750 nm (orange and red), and orthosilicate zinc Zn2SiO4, subsidized manganese, has a luminescence with maximum at 525 nm in the band 480÷570 nm (green).

The disadvantage of amorphous silicon dioxide is also reduced efficiency when using only one of the color areas of the light.

The lack of doped manganese of orthosilicate zinc is low intensity radiation under photoexcitation in the air (the energy of the photons is not more than 6.0 eV). However, the excitation by photons with energies more than 6.0 eV requires the use of a vacuum environment, which limits the practical application of this material.

Also known luminescent ceramic powder material [RF patent №2144053], which is the phosphor with green radiation and represents a mixture of powders - activated metals zinc sulphide ZnS:Cu, Au,Al), activated with terbium borate India Interest3:b, and activated manganese willemet Zn2SiO4:Mn. This is the material one of the components (activated manganese willemite) obtained by mixing until smooth zinc oxide (ZnO zinc) in an amount of 4 g, silicon dioxide (SiO2) in the amount of 6 grams of manganese sulfate (nSO4) in an amount of 0.2 grams, followed by firing at 1200°C for two hours, rinsing and drying.

The disadvantage of this material lies in the complexity of its composition and of low intensity radiation.

Known nanostructured composite material [the application for a patent of Russia №2005137151, as well as European and international application EP 2004/004573, WO 2004/096943], including y nanoparticles containing the core, obtained from luminescense metal salt selected from phosphates, sulfates or fluorides, in particular, using zinc, surrounded by a membrane derived from a salt or metal oxide, is able to prevent or reduce the transfer of energy from the nucleus after electronic excitation to the surface of the nanoparticles. The material obtained by heat treatment of the respective liquid mixtures of starting materials using organic environments at temperatures of 50-350°C. Such a material with a core made of salts of cerium Grey4and the shell of the salts of lanthanum LaPO4, fluorescent simultaneously in four areas of visible light with a maximum emission 488, 545, 586, 617 nm (respectively, blue, green, yellow, and orange).

The disadvantage of the material is the distribution of the study several the colour areas that reduces the effectiveness and efficiency of the phosphor for any selected area with radiation.

Also known luminescent nanostructured composite material [U.S. patent No. 7205048], including y nanoparticles containing a core of cadmium selenide CdSe, surrounded by a shell of zinc sulfide ZnS with organic inclusions. The material obtained by the process liquid mixtures of starting materials and luminesce in the band 500÷600 nm (green and yellow).

The disadvantage of the material is the distribution of radiation in two color areas, reducing the effectiveness of the phosphor for any of the above areas of radiation.

The closest to the invention a luminescent nanostructured composite ceramic material [Journal of the Electrochemical Society, 2005, Vol.152, No.9, H146÷H151]containing particles, each of which includes a core made of amorphous silicon dioxide SiO2surrounded by a shell of orthosilicate zinc Zn2SiO4doped manganese in the amount of 2 mol.%. The average diameter of the core is 750 nm, the average thickness of the single layer sheath of 150 nm on a dual - 220 nm. Size of grains of the specified shell correspond to the particle size of nanostructured materials. Material-prototype get in two stages. At first make the semi-finished product comprising a liquid component and dioxidine, by performing chemical reactions in solutions with the participation of tetraethoxysilane and other components with subsequent centrifugalism. Then produce drying (100÷500°C) and annealing (thermal processing, sintering) at a temperature of 1000°C and receive material with particles as cores of amorphous silicon dioxide covered with shells of doped manganese of orthosilicate zinc. This material has a luminescence with a maximum at 521÷522 nm (green).

The disadvantage of the prototype is the reduced intensity of the radiation.

The objective of the invention is to provide a luminescent nanostructured composite ceramic material providing luminescence of high intensity radiation in a narrow band of wavelengths of the visible range, corresponding to one green hue, the efficiency of excitation of luminescence centers and the increase of the quantum yield.

To solve the problem luminescent nanostructured composite ceramic material containing silicon dioxide SiO2and doped manganese willemet Zn2SiO4, characterized in that it additionally contains zinc oxide ZnO, silicon dioxide is a cristobalite, willemite derovan manganese by the formula Zn2-xMnxSiO4where the variable x takes knowledge is possible in the range from 0.05 to 0.15, components of the material taken in the following ratio: cristobalite - 45÷55 wt.%, zinc oxide 5÷7 wt.%, willemet 38÷50 wt.%, moreover, the grain size of cristobalite and zinc oxide are in the range from 55 to 70 nm, and the grain size of willemite in the range from 10 to 20 nm.

The technical result of the proposed invention is to increase the intensity and extension of technical tools (luminescent nanostructured composite ceramic materials), intensely luminescent in a narrow band of the visible spectrum, i.e. in the form of a single hue. Namely created luminescent nanostructured composite ceramic material having a high radiation intensity of green color in the band 500÷570 nm. This is achieved experimentally selected, the above composition and structure of the proposed material.

In the material prototype luminescence is carried out by absorption of the exciting radiation directly in willemite centers of luminescence in the form of ions MP2+in the energy of 5.0 eV [the above-mentioned Journal of the Electrochemical Society, 2005, Vol.152, No.9, fig.6]. In the proposed material, this process also takes place, but, in addition, it is effective absorption of the excitation radiation in the energy region of 5.7 eV defective E'-centers (entry in the form of vacancies of oxygen atom with a localized electron), in the crystalline phase silica (cristobalite), and subsequent nonradiative transfer of this energy located in willemite centers of luminescence in the form of ions MP2+. The action proposed in the material of both of these processes improves the efficiency of excitation of luminescence centers and the increase of the quantum yield.

The drawing shows the spectra of cathodoluminescence four fluorescent materials: 1, 2 and 3 samples, respectively, No. 1, 2 and 3 of the proposed material; 4 - sample No. 4 material, the composition of which is outside the proposed composition of the fluorescent material. The abscissa axis of the graph deferred wavelength in nanometers (nm)on the y - axis the radiation intensity in relative units (UNED).

The spectra shown in the drawing pulse cathodoluminescence were excited at room temperature by electron beam accelerator RADAN (current density 1 A/cm square, the electron energy of 180 Kev, pulse duration 3 NS) and were recorded using a CCD and computer.

In the table below (column 1÷5) described examples (composition) proposed luminescent nanostructured composite ceramic material (samples№№1÷3, 5÷9) and an example implementation of another luminescent nanostructured composite ke is omicheskogo material (sample No. 4), the composition and structure of which does not correspond to the composition and structure of the proposed material.

The grain size of cristobalite and zinc oxide all listed in the table, the samples are in the range from 55 to 70 nm, and the grain size of willemite in the range from 10 to 20 nm, with the exception of sample No. 4, the grain size of all components which exceed 120 nm. In the table (column 6) also shows relative values (Otel.) the intensity of radiation samples of the proposed material at the wavelength of 521 nm in comparison with a single-level radiation of the sample No. 4 other material.

Table
No. sampleSilica amorphous, wt.%Silicon dioxide cristobalite and/or zinc oxide are suitable. wt.% wt.%Willemet, derovan. manganese, wt.%Manganese in willemite Zn2-xMnxSiO4the value of xThe relative intensities of radiation (Otel.)
123456
1 -49340,0722,1
6
2-45500,157,3
5
3-55380,056,25
7
472-
-
280,031,0
5-47470,1521,6
6
6-52420,14 20,4
6
7-47470,1115,5
6
8-52420,1014,05
6
9-52420,0711,4
6

As shown in the drawing, the value of the amplitude spectrum radiation at a wavelength of 521 nm for the proposed material (curve 1, sample No. 1) is 530 relative units, and for the material, the composition of which is beyond the proposed limits (curve 4, sample No. 4), the value of the amplitude spectrum of the radiation at the same wavelength (521 nm) is 24 relative units. That is, the radiation intensity of sample No. 1 of the proposed material in 22.1 times higher than the emission intensity of the sample No. 4 (column 6 of the table). The fluorescent intensity is ncii other samples of the proposed material (No. 1÷3, 5÷9) of 6.25÷21.6 times the intensity of sample No. 4. Mentioned relative values of the intensity levels of the samples given in the table.

Below are examples of the manufacturing methods described in the table of samples of fluorescent materials.

Example 1.

The powder of silicon dioxide (Aerosil 90) with a specific surface area of 90±15 m2/g and an average particle size of 20±5 nm is formed by pressing under a pressure of 0.4 GPA to obtain a porous matrix of silica with a relative density of 0.35. Molded by hot pressing, static or dynamic.

The resulting matrix can be in the form of tablets with a diameter of from 10 to 20 mm, thickness from 0.3 to 1.0 mm, or any other desired shape (e.g. the shape of a plate).

Then shestibalny powder manganese nitrate MP(NO3)2·6N2O and an aqueous solution of zinc nitrate Zn(NO3)2having a concentration of 50±10 g/l, mixed in such proportions that 1 ml of aqueous solution of zinc nitrate accounted for 0.07 g setevogo powder manganese nitrate. Thus willemet will derovan manganese by the formula Zn2-xMnxSiO4where the variable x has a value of 0.07, which coincides with the above number of grams of powder of manganese nitrate in 1 ml aqueous solution of zinc nitrate.

The obtained liquid mixture is impregnated with Pori is thuja matrix of silicon dioxide. The impregnated matrix is dried at a temperature below the boiling temperature of the liquid component of the specified liquid mixture, in particular at a temperature of 70°C for 2 hours. This cycle of operations impregnation-drying is carried out twice, to achieve the concentration of manganese in 0.41 wt.% of the total final weight pressed.

Finally, produce annealing the dried matrix in an atmosphere of air at a temperature of 1200°C for 1 hour.

The resulting luminescent nanostructured composite ceramic material, the composition and the intensity of the radiation which corresponds to sample No. 1 (table).

Received a sample of material in the form of the above-mentioned tablet or other form, if necessary, can be turned into a powder with the desired particle size.

Example 2.

Sample No. 2 obtained by the method described in example 1, except that the powder of silicon dioxide (Aerosil 90) is formed by pressing under a pressure of 0.5 GPA to obtain a porous matrix of silica with a relative density of 0.5. In addition, shestibalny powder manganese nitrate and an aqueous solution of zinc nitrate are mixed in proportions when 1 ml of aqueous solution of zinc nitrate accounted for 0.15 g setevogo powder manganese nitrate, and the cycle of operations impregnation-drying is carried out to achieve a concentration of Mar is the like to 0.64 wt.% of the total final weight pressed.

Example 3.

In the manufacture of sample No. 3 used in the same way as in the sample No. 1 except as follows:

the powder of silicon dioxide (Aerosil 90) is formed by pressing under a pressure of 0.3 PA to obtain a porous matrix of silica with a relative density of 0.2;

shestibalny powder manganese nitrate and an aqueous solution of zinc nitrate are mixed in proportions when 1 ml of aqueous solution of zinc nitrate had 0,05 setevogo powder manganese nitrate;

the cycle of operations impregnation-drying is carried out to achieve the manganese concentration of 0.18 wt.% of the total final weight pressed.

Example 4.

Sample No. 4 with the lowest level of intensity of radiation, does not contain, in contrast to the proposed material, cristobalite and zinc oxide obtained by the method different from the method described in example 1, the following characteristics. The powder of silicon dioxide (Aerosil 90) is formed by pressing under a pressure of 0.2 GPA to obtain a porous matrix of silica with a relative density of 0.15. In addition, shestibalny powder manganese nitrate and an aqueous solution of zinc nitrate are mixed in proportions when 1 ml of aqueous solution of zinc nitrate accounted for 0.04 g setevogo powder manganese nitrate, the cycle of operations impregnation-drying etc which lead to the achievement of manganese concentration of 0.15 wt.% of the total final weight of pressing. Finally, annealing the dried matrix is carried out at a temperature of 1050°C for 1.5 hours.

Example 5.

Sample No. 5 obtained by the method described in example 1, except that the powder of silicon dioxide (Aerosil 90) is formed by pressing to obtain a porous matrix of silica with a relative density of 0.4. In addition, shestibalny powder manganese nitrate and an aqueous solution of zinc nitrate are mixed in proportions when 1 ml of aqueous solution of zinc nitrate accounted for 0.15 g setevogo powder manganese nitrate, and the cycle of operations impregnation-drying is conducted until reaching the concentration of manganese at 0.49 wt.% of the total final weight of pressing. Annealing the dried matrix is carried out at a temperature of 1200°C for 5 hours.

Example 6.

In the manufacture of sample No. 3 used in the same way as in the sample No. 1 except as follows:

the powder of silicon dioxide (Aerosil 90) is formed by pressing under a pressure of 0.3 PA to obtain a porous matrix of silica with a relative density of 0.42;

shestibalny powder manganese nitrate and an aqueous solution of zinc nitrate are mixed in proportions when 1 ml of aqueous solution of zinc nitrate had 0,06 setevogo powder manganese nitrate;

drying the impregnated matrix, silicon dioxide Khujand is realized at a temperature of 80°C for 4.5 hours.

Example 7.

Sample No. 7 obtained by the method described in example 5, except that by mixing a powder of manganese nitrate and aqueous solution of zinc nitrate in 1 ml aqueous solution of zinc nitrate accounted for 0.11 g setevogo powder manganese nitrate, and the cycle of operations impregnation-drying is carried out to achieve the concentration of manganese in 0.23 wt.% of the total final weight pressed.

Example 8.

Sample No. 8 obtained by the method described in example 6, except that when mixing the powder of manganese nitrate and aqueous solution of zinc nitrate in 1 ml aqueous solution of zinc nitrate accounted for 0.1 g setevogo powder manganese nitrate, and the cycle of operations impregnation-drying is carried out to achieve the manganese concentration of 0.21 wt.% of the total final weight pressed.

Example 9.

Sample No. 9 obtained by the method described in example 8, except that when mixing the powder of manganese nitrate and aqueous solution of zinc nitrate in 1 ml aqueous solution of zinc nitrate accounted for 0.07 g setevogo powder manganese nitrate, the cycle of operations impregnation-drying is carried out to achieve the concentration of manganese in to 0.19 wt.% of the total final weight pressing and annealing the dried matrix is carried out at a temperature of 1100°C for 0.5 hours.

Luminescent nanostructured composite ceramic material, containing silicon dioxide SiO2and doped manganese willemet Zn2SiO4, characterized in that it contains zinc oxide ZnO, silicon dioxide is a cristobalite, willemite derovan manganese by the formula Zn2-xMnxSiO4where the variable x takes values in the range from 0.05 to 0.15, components of the material taken in the following ratio: cristobalite 45÷55 wt.%, zinc oxide 5÷7 wt.%, willemet 38÷50 wt.%, moreover, the grain size of cristobalite and zinc oxide are in the range from 55 to 70 nm, and the grain size of willemite in the range from 10 to 20 nm.



 

Same patents:

FIELD: manufacture of electroluminescent devices.

SUBSTANCE: proposed charge contains the following components, mass-%: copper monochloride CuCl, 0.05-0.15; manganese fluoride MnF2·3H2O, 0.2-0.45 or manganous nitrate Mn(NO3)2·6H2O, 0.196-0.43; ammonium halogenide, 0.5-1.5; zinc chloride ZnCl2·2H2O, 0.25-1; or zinc bromide ZnBr2, 0.28-1.2; oxalic acid, H2C2O4·2H2O or hydrazine sulfate (NH2OH)2·H2SO4, or hydroxylamine hydrosulfate NH2OH·HCl, 1-3; sulfur, 2-4; the remainder being zinc sulfide ZnS. Charge may contain ammonium chloride NH4Cl, ammonium bromide NH4Br or ammonium iodide NH4J used as ammonium halogenide. Charge components are thoroughly mixed, sieved and calcined in reducing atmosphere at temperature of 850-1050°C. Calcined luminophor is cooled, sorted out and subjected to chemical treatment, dried and sieved afterwards. Proposed charge increases luminosity by 2 times.

EFFECT: intensified luminosity; increased service life of articles; possibility of changing the color at constant level of brightness.

2 cl, 2 tbl, 4 ex

FIELD: manufacture of electroluminescent devices.

SUBSTANCE: proposed charge contains the following components, mass-%: copper monochloride CuCl, 0.05-0.15; manganese fluoride MnF2·3H2O, 0.2-0.45 or manganous nitrate Mn(NO3)2·6H2O, 0.196-0.43; ammonium halogenide, 0.5-1.5; zinc chloride ZnCl2·2H2O, 0.25-1; or zinc bromide ZnBr2, 0.28-1.2; oxalic acid, H2C2O4·2H2O or hydrazine sulfate (NH2OH)2·H2SO4, or hydroxylamine hydrosulfate NH2OH·HCl, 1-3; sulfur, 2-4; the remainder being zinc sulfide ZnS. Charge may contain ammonium chloride NH4Cl, ammonium bromide NH4Br or ammonium iodide NH4J used as ammonium halogenide. Charge components are thoroughly mixed, sieved and calcined in reducing atmosphere at temperature of 850-1050°C. Calcined luminophor is cooled, sorted out and subjected to chemical treatment, dried and sieved afterwards. Proposed charge increases luminosity by 2 times.

EFFECT: intensified luminosity; increased service life of articles; possibility of changing the color at constant level of brightness.

2 cl, 2 tbl, 4 ex

The invention relates to optoelectronics nuclear physics research, but rather making a powerful solid-state lasers operating in the UV region of the spectrum
The invention relates to inorganic chemistry, to methods for sulfide electroluminophores, in particular electroluminors type a2IN6

The invention relates to opto - and acoustoelectronics and can be used in the production of luminescence indicators photo, katada and-excitation, spectrometers and elements of various equipment

FIELD: metallurgy.

SUBSTANCE: invention relates to building materials and is provided for lining of thermal units by filling, for instance ladles and soaking pits. Lining of thermal units contains siliceous filler, refractory clay, chromomagnesite, silicate - lump and compound for coating on the basis of mixer graphite. Lining additionally contains nanocrystalline silicon dioxide and mixture made of carbon black and fullerenes at following ratio of ocomponents, wt %: siliceous component - 54-76, refractory clay - 9-15, chromomagnesite 8-13, silicate - lump 2-10, nanocrystalline silicon dioxide 1-6, mixture made of carbon black and fullerenes 2-7. Received mixture is shut by water and it is applied on inner surface of ladle, after what it is applied coating on the basis of mixer graphite, which additionally contains nanocrystalline silicon dioxide and mixture made of carbon black and fullerenes at following ratio of components, wt %: nanocrystalline silicon dioxide 10-15, mixture made of carbon black and fullerenes 15-25 and mixer graphite - the rest.

EFFECT: strength increasing of lining at compression after heating up to 1500°C and metal-durability.

6 ex, 3 tbl

FIELD: construction.

SUBSTANCE: three versions of method for manufacture of construction product, where moulding mixture is prepared for bearing layers by mixing of the following components, wt %: mineral filler 65-85 and finely dispersed binder - the rest based on highly concentrated suspension of siliceous raw materials with content of particles of less than 5 mcm - 20-50%, and humidity of 12-20%. Binder is modified by organo-mineral additive - 0.02-0.1 wt % from mass of dry substance of suspension or it additionally comprises plasticising additive - 2-5% from mass of dry substance. Layerwise moulding of product is carried out from moulding mixes for bearing layers and heat insulation layers installed between then, and strengthening according to three versions.

EFFECT: reduced time for manufacture of multi-layer products with preservation and improvement of mechanical strength, porosity, density, frost resistance.

25 cl, 10 ex, 10 tbl

FIELD: construction.

SUBSTANCE: raw mix for manufacture of wall ceramic products includes microsilica of crystalline silicon production and spillage of crushed processed coal lining of electrolytic cells at the following ratio of components wt %: microsilica - 82-88; spillage from crushed processed coal lining of electrolytic cells - 12-18. Method for manufacture of raw mix includes mixing of components, mix moistening in plate-type granulator to obtain moulding humidity of 21%, moulding of products from produced granulate, drying and baking at the temperature of 1000°C.

EFFECT: increased strength and coefficient of structural quality.

2 cl, 1 ex, 2 tbl

FIELD: fire safety.

SUBSTANCE: invention relates to refractories industry, namely to the production of lightweight refractory products for heat unit lining. Silica lightweight refractory is produced from refractory mixture containing, wt %: quartzite - 55-70, coke breeze - 30-45, microsilica - 2-5 (over 100%), mineraliser - 5-7 (over 100%) in the form of interground of limestone, refractory clay and converter residues with the relation in the mixture, wt %: 46-54 limestone, 30-34 refractory clay, 16-20 converter residues. It is preferable for the quartzite to have the coarseness less than 0.09 mm, for the coke breeze - less than 0.5 mm, and the moisture content to account for 15-20 wt %.

EFFECT: silica lightweight refractory is characterised by the improved mechanical strength and porousity, small volume weight and can be used not only as heat insulation but also in bearing structures.

2 cl, 1 tbl

Ceramic paste // 2354628

FIELD: construction.

SUBSTANCE: ceramic paste includes opal cristobalite rock reduced to particle size under 1 mm, superplastification agent C-3, water and marl clay with particle size under 0.1 mm, at the following component rate, wt %: opal cristobalite rock - 50-80; marl clay - 5-30; superplastification agent C-3 - 0.1-1.2; the rest is water.

EFFECT: obtaining ceramic facing items of light tones with reduced average density and heat conductivity parametres.

4 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to fireproof industry, namely to obtaining plastic fireproof mass for temporary closing of tuyer openings of blast furnaces when replacing blowing tuyers. Plastic fireproof mass contains following components, wt %: mixture of novolacquer and resol-type phenol resin with ethylene glycol 7.0-8.0, fireproof clay 8.0-15.0, SAS (sodium alkylbenzosulphonate) 1.0-1.5, plasticiser 3.0-5.0, silica filler - the remaining part.

EFFECT: obtaining of mass, which has increased plasticity, small shrinkage in work and long service life, secures easy unseaning of tuyer opening when replacing blowing tuyer.

2 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to compositions for hot repairing of fireproof masonry of industrial furnaces by method of ceramic welding and can be used in metallurgical industry in coke chemical production. Ceramic mixture for repairing coke furnace masonry includes quartz sand, silicon and coke dust with the following component ratio in wt %: quartz sand - 65-75; silicon -15 -30; coke dust -5-15.

EFFECT: obtaining heat-resistant and mechanically durable ceramic welding with homogeneous mineralogical composition.

3 cl, 1 tbl

FIELD: chemistry.

SUBSTANCE: present invention pertains to aviation and rocket technology, mainly to making rocket antenna domes. The method of making composite material based on sintered silicon dioxide involves saturating the work piece with an acetone solution of phenol-formaldehyde resin for a period of 1-2 hours. The work piece is then dried in air, saturated with an acetone solution of a mixture of phenol-formaldehyde and silicon resin in ratio of 1:1 and then polymerised.

EFFECT: increased strength and thermal stability of the product.

3 ex

FIELD: chemistry.

SUBSTANCE: present invention pertains to rocket technology, mainly to making antenna covers. The technical outcome of the invention is improved mechanical and radio-technical properties. The method of making a cover of an antenna cap from quartz ceramic involves slip casting a water suspension into a gypsum mould and drying. The half-finished cover is then dried at 500-600°C for 3-5 hours and saturated with silicon resin, with subsequent polymerisation at 220-350°C in a period of 4-5 hours. The cover is then mechanically processed into the required dimensions, thermally processed at 700-900°C for 4-6 hours, repeatedly saturated with silicon resin and polymerised.

EFFECT: improvement of mechanical and radio-technical characteristics.

4 ex

Fireproof mass // 2345040

FIELD: chemistry.

SUBSTANCE: invention relates to fireproof mass compositions, which can be used for fettling of smelters, production of forms for casting, mainly, non-ferrous metals. Fireproof mass contains chromomagnesite, boric acid, quartzite, zircon, alumina and fluorine phlogopite, lime with folowing component ratio, wt %: chromomagnesite - 25.0-35.0; boric acid - 3.0-5.0; zircon - 8.0-12.0; alumina - 8.0-12.0; fluorine phlogopite - 3.0-5.0; quartzite - remaining part.

EFFECT: increase of product resistance to erosion.

1 tbl

FIELD: nanotechnology.

SUBSTANCE: invention relates to nanotechnology and nanomaterials and can be used at receiving of inorganic and organic-inorganic fine-grained and nano-structured metallised materials, metal-polymers and nanocomposite. Suspension of organic-inorganic nanostructures, containing nanoparticles of noble metals, implemented in the form of poly-complex in two-phase reacting system, consisting of two volume contacting immiscible liquids. Poly-complex includes organic molecules, containing amides in amount 2 or more, and nanoparticles of noble metals. Suspension is received by means of forming of two-phase reacting system, consisting of two contacting volumetric immiscible liquids, addition in it of restorative and synthesis of nanoparticles. Additionally metallised molecules of precursors are dissolved in hydrophobic phase, reducer is added into aqueous phase, and in the capacity of ligands there are used organic molecules, into content of which there are included amides in amount 2 or more. Invention provides receiving of new nano-structured organic-inorganic polymeric complexes on the basis of polyamines, containing nanoparticles of noble metals (Pd, Au) of size up to 10 nm, which allows high specific surface area and are characterised by narrow dispersion of dimensions.

EFFECT: it is provided high density of particles packing in organic-inorganic nano-structures and high performance of transformation of initial material into nanoparticles of noble metals.

23 cl, 12 dwg, 1 ex

FIELD: electrical engineering.

SUBSTANCE: invention relates to semiconductor electronics and can be used for making heavy duty and high-precision transistors. The transistor contains a first set, which includes N1>1000000 regions with the same conductivity, a second set which includes N2 >1000000 regions with the same conductivity, as well as a third set, which includes N3>1000000 regions with opposite conductivity. The regions are made with formation of a first set of separate same-type point p-n junctions between regions from the first and third sets and a second set of separate same-type point p-n junctions between regions from the second and third sets. Electrodes, adjacent regions included in at least one of the said sets, for which the condition Ni>1000000, where i∈{1, 2, 3}, is satisfied, are connected in parallel by one conductor, i.e. are connected into a single current node.

EFFECT: obtaining high-precision heavy duty transistors with stable electrical parametres.

21 cl, 9 dwg

FIELD: physics.

SUBSTANCE: invention is related to the field of nanomaterials application. It is suggested to use carbon of bulbous structure as sensitive element of detector in terahertz range of waves that absorbs electromagnet radiation (EMR) in the range of frequencies of 30 - 230 THz.

EFFECT: improved performance characteristics.

3 dwg

Up!