Insulation foamed carbon composite material
(57) Abstract:Usage: as lining in a metallurgical furnaces, as well as for filling cavities and insulation of constructions in the auto, aircraft and shipbuilding. The inventive material comprises in wt.h.: foamcoke - product heat treatment, the binder-based oligomer, mainly furfuryl alcohol 98 - 99, filiform crystals of refractory compounds, mainly of silicon carbide 1 - 2. Characteristics: compressive strength 54 - 85 kg/cm2, Flexural strength 20 - 35 kg/cm2. table 2. This invention relates to thermal insulation materials with low density and can be used as linings in metallurgical furnaces, as well as for filling cavities and insulation of constructions from UKM in the auto, aircraft and shipbuilding, working under vacuum or in an inert atmosphere at temperatures up to 2500oC.Known insulating foam ACM  including paralizovannnuyu matrix of a mixture of thermosetting resin and carbon fibers and hollow balls of carbon with a further coating of pyrolytic graphite.A significant drawback of this material are the two who CSOs UKM, and also not sufficiently high mechanical strength.The closest known insulating materials is foamcoke brand VK-20-900  consisting of a matrix product heat treatment of synthetic, thermosetting resins and paralizovannoj filler in the matrix is coated. The disadvantage of the above-mentioned insulating material is insufficient mechanical strength:
< / BR>The aim of the invention is the improvement of physico-mechanical properties.This objective is achieved in that, as the matrix is used foamcoke heat-treated oligomer of furfuryl alcohol with a reinforcing filler SiC whiskers. The distinguishing characteristics of heat-insulating foamed ACM are:
as the matrix used foamcoke, which is the product of the heat treatment of polystyrene-based oligomer of furfuryl alcohol;
as the reinforcing filler is entered refractory compounds in the form of SiC whiskers (NC SiC).All this allows to obtain durable reinforced foamcoke.Analysis of existing in this area of materials shows that currently, the processing of foam-based oligomer of furfuryl alcohol.Getting reinforced foam coke is carried out on the following technology. The foam obtained on the basis of CFC and filler NC SiC, the recipe is given in tab. 1, pre rigidly fixed to the heat-resistant pot, pour the activated carbon and subjected to heat treatment up to 1000oC with an average speed of temperature rise of 10oC/hour in an inert atmosphere.This leads to the change of physico-chemical status foam coke by creating the heat treatment of polystyrene-based CFC structural frame SiC single crystals in coke residue wall monocacy.Examples of formulations of the compositions shown in table 1. The results of physico-chemical tests are summarized in table 2. As can be seen from table 2, the physical-mechanical characteristics of the obtained foamed UKM for the best recipes 2, 3, 4 average 3 to 3.5 times higher than in the known foam UKM, which allows you to create items and use them in aeronautical engineering. Insulation foamed carbon composite material comprising a matrix of products heat treatment of synthetic thermosetting resin and a reinforcing filler, characterized in that the matrix quality alcohol, as the reinforcing filler - filamentary crystals of refractory compounds, mainly of silicon carbide, in the following ratio, wt.h.Foamcoke 98 99
Reinforcing filler 1 2i
FIELD: metallurgy, aircraft industry, power engineering, semiconductor technique.
SUBSTANCE: plate tar cake is ground to produce fractional makeup having at least 97 mass % of <0.09 mm-fraction and at least 91 % of <0.045 mm-fraction. Grinded cake is mixed with 35-40 % of coal-tar asphalt and 0.015-1.5 mass % of organic additive at 120-130°C. As organic additive space-hindered phenols and/or phenylphosphites are used. Obtained mass is formed, cooled and crushed followed by pressing to produce semimanufactured article with density of1.01-1.06 g/cm3. Said articles are sintered at 800-1300°C and black-leaded at 3000°C. Finished black-leaded material has bulk density of 1760-1950 kg/cm3, compression strength of 90-105 MPa and blending strength of 60-75 MPa. Material of present invention is useful in production of electrodes, seal assembly and material of high purity.
EFFECT: black-leaded material with improved physical characteristics.
1 tbl, 10 ex
FIELD: aircraft industry, power production.
SUBSTANCE: carbon-carbonic material is impregnated with mixture, containing potassium hydrophosphate, manganese hydrophosphate, phosphoric acid and water in mass ratio of (0.5-0.7):(1.0-2.8):(1.8-2.2):(10-50), respectively. Then material is dried and heat treated with temperature rising rate of 15-20°C/h up to 650-700°C to produce 2.0-5.0 mass % of ultraphosphate as calculated to starting material weight. Dried material is cooled, impregnated with mixture of furfuryl alcohol and phenol-phormaldehyde resin in mass ratio of (8.0-9.0):(1.2-2.0), respectively, heat treated again with temperature rising rate of 8-20°C/h up to 280-350°C to produce solid residual content of 0.5-5.0 mass %. Method of present invention makes it possible to reduce oxidative losses when heating at 600°C in air up to 0.1-0.25 %/h and to obtain material with compressive resistance of 120-150 MPa and long-term serviceability at 520-550°C.
EFFECT: decreased oxidation losses; material with increased compressive resistance and serviceability.
1 tbl, 5 ex
FIELD: chemical industry branches, special technical equipment, possibly manufacture of different articles and heat exchanging systems.
SUBSTANCE: process comprises manufacture of preliminarily prepared coke-filler of green or baked petroleum coke by performing steps of disintegrating till fraction 90 micrometers at content of fraction 20 -50 micrometers no less than 60 -65 %, mixing it with coal cake in relation 5.0 - 2.0 respectively; heating up to 1100 -1300°C; cooling, disintegrating till fraction no more than 90 micrometers; using prepared coke-filler for making molding mass of articles; pressing articles, firing them and graphitizating. Steps of mixing disintegrated coke with cake at relation 5.0 - 2.0, heating mixture, cooling it and again disintegrating may be repeated twice. Density of articles 1.78 - 1.80 g/cm3, compression strength 67.0 - 72.0 MPa.
EFFECT: enhanced quality of articles having no surface flaws.
2 cl, 2 ex
SUBSTANCE: invention relates to refractory compositions for gluing graphite-containing articles to metal and can be used in metallurgy, in particular in electrolyzers for imbedding cathode rods into bottom blocks. Composition is constituted by filler including graphite and thermal anthracite, binder containing coal-tar pitch with phenol-formaldehyde resin and curing agent, said filler further containing gray iron in the form of cuttings 0.1 to 1.6 mm in size and including also some amounts of phosphorus and silicon (0.8-1.6 and 2.5-3.6%, respectively, on the weight of gray iron) and said pitch additionally containing methylnaphthalene. Total composition of ingredients is the following, wt %: gray iron 60-70, graphite/thermal anthracite fraction up to 0.2 mm, 8-12, and binder 22-28; and, more specifically: coal-tar pitch 11-21, methylnaphthalene 2-4, phenol-formaldehyde resin 4.3-6.7, and curing agent 0.3-0.7.
EFFECT: reduced bottom voltage drop and increased wear resistance of bottom block due improved physicochemical properties of composition.
FIELD: chemical industry and special-purpose technique; manufacture of large-sized blanks of shaped articles for chemical and heat-exchange apparatus.
SUBSTANCE: starting coke-filler is mixed with coal-tar pitch and is impregnated with it; then mixture is calcined at temperature of 1100°C and ground to size not exceeding 1.25 mm at content of particles of no more than 0.07 mm in the amount not exceeding 50%. For obtaining fine-grained materials, grinding is continued till particles of 0.5 mm have been obtained. Powder thus obtained is mixed with pitch and blanks are molded from hot coke-pitch mass by extrusion through tip or in mold, after which blanks are subjected to roasting and graphitization. After roasting and graphitization, blanks may be again impregnated with coal-tar pitch and subjected to repeated roasting. Density of material thus made ranges from 1.65 to 1.78 g/cm3, compressive strength ranges from 30.0 to 51.3 Mpa and bending strength ranges from 16 to 26.4 Mpa.
EFFECT: avoidance of rejects.
3 cl, 3 ex
FIELD: electrical production of ferro-alloys and steel; manufacture of self-roasting electrodes.
SUBSTANCE: proposed electrode mass contains thermo-anthracite, coal-tar pitch and modifying agent in form of polymers of benzene separation at the following ratio of components, mass-%: thermo-anthracite, 70-79; coal-tar pitch, 20-28; polymers of benzene separation (wastes of by-product coke industry), 1-2. Ratio of fractions of thermo-anthracite in electrode mass, mass/%: -16+6 mm, 11-21; -6+0.063 mm, 28-38; the remainder being lesser than +0.063 mm. Benzene separation polymers have the following ratio of components, mass-%: agents not soluble in toluene, 2.0-4.0; water, 0.05-0.10; ash, 0.10-0.15; the remainder being aromatic hydrocarbons. Mechanical strength of electrodes is equal to 19.7-22.3 Mpa and porosity of electrodes is equal to 19.8-20.6%.
EFFECT: enhanced efficiency.
3 cl, 2 tbl
FIELD: by-product-coking industry; electrode industry; production of compositions for impregnation of graphitized carbon products.
SUBSTANCE: the invention is pertaining to the compositions for impregnation of graphitized carbon products and may be used in the by-product-coking industry and electrode industry. The impregnating composition of graphitized carbon products includes a coal-tar pitch and a plasticizer, in capacity of which use polymeric compounds of the benzene group (wastes of the by-product-coking process), at the following ratio of the components (in mass %): the coal-tar pitch - 94-96; polymeric compounds of the benzol group - the rest. The polymeric compounds of the benzol group have following composition(in mass %): substances insoluble in a toluene - 1.0-3.0; water - 0.05-0.10; ash - 0.10-0.15; aromatic hydrocarbons - the rest. Density of the graphitized carbon products impregnated with this composition after burning makes 1.78÷1.89 g/cm3; after graphitization - 1.85÷1,90 g/cm3, porosity - 19.2÷19.9 %, a mechanical strength - 26.5÷27.5 MPa. The invention also allows to improve production conditions due to reduction of the content of the carcinogenic substances in the peck.
EFFECT: the invention ensures an increased density of the graphitized carbon products impregnated with this composition by several percents, improved production conditions due to reduction of the carcinogenic substances share in the peck.
2 cl, 2 tbl
FIELD: metallurgy; semiconductor and aeronautical engineering; manufacture of electrodes, seals for aircraft engines and super clean articles.
SUBSTANCE: coke at yield of volatile agents of 4.0-12.0 mass-% in which fraction of size lesser than 0.09 mm is no less than 97 mass-% and fraction of size lesser than 0.045 mm is no less than 91 mass-% is mixed with 30-40 mass-% of coal-tar pitch, 0.015-2.0 mass-% of sterically hindered phenols and/or phenyl phosphites and 0.015-2.0 mass-% of stearic acid. Mass ratio of stearic acid to sterically hindered phenols and/or phenyl phosphites ranges from 1:1 to 2:1. Mixing with coal-tar pitch is performed at temperature of 110-160°C. Mass thus obtained is cooled to room temperature, crushed, ground and blanks at density of 1.01-1.25 g/cm3 are molded and roasted at 1000°C. Roasted blanks are graphitized at temperature rise by the following scheme: to 800°C, 30-60°C/h; to 1500, 5-25°C/h; to 2200°C, 15045°C/h. Holding time at each stage is equal to 3/7 h. Material thus obtained has apparent density of 1650-1870 kg/m3 at compressive strength of 103-160 Mpa and bending strength of 81-88 Mpa.
EFFECT: enhanced efficiency.
2 tbl, 1 ex