(57) Abstract:The invention: the invention relates to the field of military technology and can be used in designs requiring high mechanical strength, in particular in body armor designs. The ceramic material includes the following oxides in wt.%: aluminum oxide 95,025; silicon oxide 1,25; calcium oxide 0,005; iron oxide 0,04; magnesium oxide 0,63; titanium oxide 2,0; yttrium oxide 1,0; sodium oxide of 0.05. table 1. The invention relates to the field of military technology and can be used in designs requiring high mechanical strength, in particular in body armor designs.Known corundum ceramic materials having high mechanical strength 
In corundum ceramics combine a number of valuable properties, due to which it has found wide application in various fields of mechanics. Corundum ceramics has high strength and dielectric properties, and high chemical resistance.However, the process of obtaining such ceramics are difficult and labor-intensive, in particular the need to perform sintering at a high temperature of 1800oC. the Introduction of admixtures and additives the properties of ceramics.Known charge for making agrarias, including silicon carbide, carbide fight, clay refractory, kaolin, aluminium oxide and an additive comprising sodium carbonate and by-products from the production of caprolactam and antioxidant 
The lack of charge is low mechanical strength.Closest to the present invention is corundum ceramic material with a low sintering temperature 
Corundum ceramic material, taken as a prototype, has the following composition:
Aluminum oxide 94,02%
The silicon oxide (IV) 2,22%
Calcium oxide is 0.01%
Iron oxide (III) 0,06%
Magnesium oxide (II) 1,14%
The titanium oxide (IV) 2.5% of
The sodium oxide of 0.05%
Calcium oxide and iron oxide (III) are present as impurities in the composition of the starting components.Ceramic material, taken as a prototype, has the following advantages: reduced the sintering temperature due to the addition of titanium oxide (IV) and magnesium oxide (II), the material has a high technical and economic parameters. This material is used for manufacturing reasons resistors.The disadvantage of the material is low apparent density ( 3,67 g/cm3), Kotelnich conditions does not provide sufficient mechanical strength, allowing the use of this material, particularly in armored structures. In tough spot-kick and the concentration of the load is the destruction of the elements made of ceramic material. The degree of destruction depends primarily on the properties of the material itself: the sintering temperature, apparent density, environment sintering, the ultimate strength in static bending.The invention is aimed at improving the strength characteristics of the material by increasing the apparent density and mechanical strength for use in his armored structures.To achieve this goal ceramic material based on aluminum oxide, containing as mineralizuyushchie additives magnesium oxide (II), silicon oxide (IV), titanium oxide (IV) and mixtures of calcium oxide (II), iron oxide (III), sodium oxide included in the source components, further comprises yttrium oxide (III) in the following ratio, wt.Aluminum oxide 95,025
The silicon oxide (IV) 1,25
Calcium oxide 0,005
Iron oxide (III) 0.04
Magnesium oxide (II) 0,63
The titanium oxide (IV) 2,0
Yttrium oxide (III) 1,0
The sodium oxide 0,05
Talc pre-sorted, crushed and burned at t 1170oC. All materials were dispersively separately in different mill to a specific surface area of not less than 10000 cm2/year Produced mixing wet grinding in a ball mill MS-60 using distilled water. The prepared slurry was obezvozhivani, dried, screened, progulivali at t 900oC, again sieved, adminicula and the obtained mixture prepared press the powder from which the extruded billet bilateral pressed in hydraulic presses. The task in obtaining a ceramic material with a high apparent density and mechanical strength was achieved by obtaining pieces of material with fine-grained structure, as the crystalline structure is associated with a decrease in strength properties.As in the prototype, the proposed material is aluminum oxide and the mineralizing additive was introduced in conjunction with tavernost not less than 10000 cm2/g, this helped to produce a mixture of initial components and to create favorable conditions for sintering. The result is a material with a uniform density distribution throughout the volume of the workpiece material.Precalcination talc at t 1170oC, lower in comparison with the prototype, contributed to the higher reactivity of the components of talc, providing optimal conditions for sintering workpieces material and, eventually, obtain the crystalline structure. The chemistry of the process was the fact that talc greatest lagoudaki when firing is the most intensive in the temperature range 900-1100oC.In addition, lowering the temperature of the heat treatment of talc increased the efficiency of dispersion, which led to a reduction of the time of grinding.Compared with the prototype of the content of magnesium oxide (II) in the proposed ceramic material is reduced 1.8 times to 0.63% This is sufficient for the formation on the surface of particles of aluminum oxide spinel, which inhibits the growth of crystals during compaction of the material during firing.The reduced content of magnesium oxide, which has the ability the ü material.The titanium oxide (IV) reduced the sintering temperature, while the rapid growth of the crystals. Compared with the prototype of its contents reduced to 2.0% when the sintering temperature is not increased and improved conditions for the formation of the crystalline structure.In the proposed material unlike the prototype introduced additive oxide yttrium (III) 1,0%
Introduction this Supplement helped to cause the reduction of crystal growth, reduction of intracrystalline porosity and, as a consequence, the increase in apparent density and mechanical strength of the material.Yttrium oxide enters steklovata, stabilizing the sintering process, allows you to save the fine-grained structure, increasing the density and mechanical strength of samples by reducing the number of pores and microcracks.Thus, the combination of the above factors causes directional crystallization of the material, in particular a delay of crystal growth, reducing the number of pores and microcracks.We offer ceramic material unlike the prototype has a new ratio of components and the additive oxide yttrium (III). The obtained ceramic material has characteristics that preds the prototype, a tensile strength on the level with the prototype.Ceramic material has high strength properties (apparent density and tensile strength in static bending) that it could be used for the manufacture of elements for armored structures, in particular of body armor.The test results armour blocks of the proposed ceramic material of positive, provide protection from bullets B-32 and ABOUT FSC/CST cartridge of 7.62 x 54 rifle SVD. Survivability armor plates 6-8 shots. Ceramic material based on aluminum oxide, containing as mineralizing additives titanium oxide (IV) oxide, silicon (IV), magnesium oxide (II) and mixtures of calcium oxide, iron oxide, sodium oxide, characterized in that it additionally introduced the addition of yttrium oxide (III) in the following ratio of components:
Aluminum oxide 95,025
The silicon oxide (IV) 1,25
Calcium oxide 0,005
Iron oxide (III) 0.04
Magnesium oxide (II) 0,63
The titanium oxide (IV) 2
Yttrium oxide (III) 1
The sodium oxide 0.05 to about
FIELD: production of ceramic articles; production of materials on base of aluminum oxide for manufacture of wear-resistant ceramic parts.
SUBSTANCE: proposed method includes mixing of annealed aluminum oxide with additives of silicon, calcium, magnesium and boron oxides at simultaneous wet grinding in ball mill followed by drying of powder and annealing in air, dry grinding, molding with plasticizing agent, distillation of plasticizing agent, machining of blank and sintering. Starting charge contains the following components, mass-%: B2O3, 5.0-7.0; SiO2, 3.0-4.3; CaO, 4.0-5.7; MgO, 0.3-0.4; the remainder being Al2O3. Dried powder is annealed at temperature of 950-1050°C; sintering of blanks is carried out at temperature of 1275-1295°C.
EFFECT: facilitated procedure of method; enhanced density, strength and hardness characteristics.
4 cl, 1 tbl, 3 ex
SUBSTANCE: invention refers to ceramic materials technology based on aluminium oxide with using sol-helium methods for making composites and can be used for making dynamic and static load-resistant and high heat-resistant products. According to the declared method, alumina GK-1 is mixed with reactive bimodal alumina CL 370 and water-soluble titanyl and ammonium double sulphate salt in cake ratio, wt %: alumina GK-1 5-83, alumina CL 370 5-94, TiO2 1-12. Prepared mixture is added with water-soluble binding agent at total moisture 6 to 24% over 100% in ratio of binding agent and water 1:4 to 1:16. Products are burnt maintaining isothermal ageing: at 200-300°C, 500-600°C, 700-800°C, the process is finished at complete transition temperature of anatase titanium dioxide in rutile: 1500-1600°C.
EFFECT: making nanostructure stipulating mechanical strength and thermal stability of products in transient thermal conditions.
12 ex, 2 tbl
SUBSTANCE: invention may be used in production of insulators in metal-ceramic lamps, spark plugs, insulation location parts. New composition of charge is suggested, which contains α-alumina, glass-forming composition and double-strontium borate with the following ratio of components, wt %: double-strontium borate 2-3; glass-forming composition 6-8, α-alumina - the rest. Glass-forming composition is a cake of alumina, quartz sand and magnesium carbonate.
EFFECT: reduced temperature for preliminary annealing of productions, avoidance of adsorbent sintering, improved level of dielectric properties in the area of high temperatures.
FIELD: oil-and-gas industry.
SUBSTANCE: invention related to pivotal propping agents preparation and application methods, also for additives preparation and application methods, which prevents borehole inflow, used for hydraulic fracturing operations. Cemented propping agent and additive, preventing borehole inflow, pivotal shaped have big strength and conductivity. Cemented pivots includes approximately from 0.2 up to 4% of aluminium titanat. In come cases manufacture cemented pivots by mixing bauxite and non-bauxite aluminium oxide sources, which can contain a few admixes, for instance TiO2 extruding the mixture and cementing it. A source material can be grained for better packing and resistance to crushing in final cemented pivot (optional). Hydraulic fracturing liquid may include only cemented pivots or in combination with propping agent, preferably with the propping agent of a different form.
EFFECT: propping agent conductivity and permeability increase, production cast cutting and well operation lifetime increase.
63 cl, 2 tbl
SUBSTANCE: invention relates to methods of producing alumina ceramic material meant for making articles from structural ceramic with high static loads. According to the invention, alumina is mixed with a mineralising agent characterised by viscosity of 1-5 Pa·s and surface tension (50-250)·10-3 N/m a temperature interval for burning ceramic in amount of 1-2 wt % on the cation-oxygen component. Sinter is obtained at 1300°C. The sinter is ground, pressed and burnt at 1350-1400°C. The mineralising agent used is in form of chlorides of alkali and alkali-earth metals KCl, MgCl2, LiCl, CaCl2, NaCl, BaCl2.
EFFECT: high ceramic sintering temperature with increase in ultimate bending strength.
SUBSTANCE: to manufacture structural alumina ceramics, the initial alloy of aluminium with silicon (10-14 wt %) is treated with an aqueous solution of caustic soda with concentration of 5-27% with heat recovery from the reaction volume by a coolant with the temperature of 15-25°C. Then the aluminium hydroxide residue is released from the mother solution with inclusions of sodium methyl silicate, its washing is carried out to the value of the medium pH of 8-9. The residue is dried, thermally treated on air at the temperature of 1280-1350°C for 1-3 hours, the produced cake is ground, and the charge is prepared. Items are pressed under the pressure of 150-200 MPa and are baked on air at the temperature of 1450-1500°C for 1-2 hours. The phase composition of ceramics is represented by α-Al2O3 (73-77 vol.%) and NaAlSiO4 (23-27 vol.%). It is characterised with availability of closed porosity (24%), its density - 2.9-3.0 g/cm3. The strength at impact bending is 3.5·103-4.5·103 J/m, the relative loss of bending strength after a heat cycle (in the mode of 1200°C - air) - 10-20%.
EFFECT: increased heat resistance of ceramics and its impact strength, reduced temperature of its baking.
7 cl, 3 ex, 1 tbl
SUBSTANCE: invention relates to the technology of producing ceramic articles based on aluminium oxide with high mechanical properties, meant for prolonged operation in conditions of high wearing loads. The method of producing articles from alumina ceramic involves mixing submicron finely dispersed aluminium oxide with particle size 190-210 nm with modifying additives of nanopowder of aluminium oxide, magnesium oxide and amorphous silicon dioxide. Components of the mixture of Al2O3 submicron powder, Al2O3 nanopowder, MgO and SiO2 nanopowder are ratio of 100:2.95:2.0:0.05 (wt %). The obtained powder mixture is pressed and sintered at temperature 1400-1600°C.
EFFECT: high microhardness of articles.
2 ex, 3 dwg
SUBSTANCE: invention relates to fibres from polycrystalline corundum, essentially consisting of corundum and an oxide of elements of the main subgroups of groups I and II, which can be used in producing fabric and composite materials. The fibres are produced using a method which involves adding nucleating seeds and a precursor of an oxide of elements of the main subgroups of groups I and II to aluminium chlorohydrate, adding a water-soluble polymer, subsequent spinning of fibres from said mixture and annealing said fibres at temperature 1100°C or higher. The nucleating seeds used are ultra-finely dispersed diaspore, haematite or corundum, which are added to the spinning solution in amount of 0.1-10 wt %. The oxides of elements of main subgroups of groups I and II are in the fibres in amount of 0.01-0.5 wt %. Crystallites of said corundum fibres are characterised by the following grain-size distribution: from 0 to 0.06 mcm (34%), from 0.06 to 0.122 mcm (55%) and from 0.122 to 0.3 mcm (11%).
EFFECT: fibres have improved mechanical properties.
4 cl, 1 ex
SUBSTANCE: invention relates to chemical engineering of highly porous ceramic materials and is meant for use directly for filtering and adsorbing gaseous radioactive and harmful substances in high temperature conditions (above 1000°C) and chemically aggressive media in processes for handling gaseous radioactive wastes and spent nuclear fuel at nuclear power plants and radiochemical companies in the nuclear industry. To obtain universal ceramic filter-sorbents based on a corundum highly porous block-cellular matrix, obtained by reproducing the structure of reticulated polyurethane foam, a mixture of alumina sol and silica sol in ratio of 20:80-80:20 is deposited by repeated saturation, followed by heat treatment. After the first saturation, heat treatment is carried out at 950-1100°C, and at 500-550°C after further saturation. Total content of deposited aluminium and silicon oxides deposited is equal to 5-20 wt % of the weight of the matrix.
EFFECT: obtaining an active layer with a highly developed surface, which enables to use the obtained sorption-filter elements as supports for depositing special sorbents and selective trapping of separate components of gaseous radioactive and harmful wastes.
SUBSTANCE: invention relates to technology of obtaining porous ceramic material and is intended for obtaining artificial endoprosthesis of bone tissue. Method of obtaining porous ceramic material includes preparation of mixture from ceramic powder and additive, having the function of plasticiser and pore-forming agent, formation of product with required configuration from powder mixture and further sintering. As ceramic powder used is ultradisperse powder Al2O3 or ultradisperse powder of ZrO2-based hard solutions with dissolved in it MgO or Y2O3 components, hydrosol Al(OH)3 or Zr(OH)4 in amount from 1 to 50 vol.% from mixture volume being used as plasticiser and pore-forming agent. In order to give mixture forming properties distilled water is added. Formation of product with required configuration is carried out by pressing under pressure 12-25 kN, sintering is performed at temperature1450-1600°C with isothermal exposure for 1-5 hours. With 20-45% porosity ultimate compressive strength of Al2O3-based ceramic material reaches 1000-800 MPa, that of ZrO2(Mg,Y)-based ceramic material being 800-650 MPa.
EFFECT: increase of strength characteristics of material, possessing developed porosity.