FIELD: chemistry.
SUBSTANCE: invention relates to production of low-density carbon-graphite heat-insulating materials for high-temperature vacuum furnaces or non-oxidising atmosphere furnaces and can be used in production of carbon-carbon composite materials. Oxidised graphite obtained using nitrate or bisulphate technology is exposed to a thermal shock. Carbon fibre is added to particles of thermally expanded graphite. A workpiece with density of not more than 0.07 g/cm3 is formed. The moulded porous workpiece undergoes pyrolytic saturation in cyclic mode through deposition of pyrolytic carbon on the entire volume until attaining pyrolytic saturation between 5 and 100%. A layer of graphite foil is glued on the other side of the obtained material. The material is carbonised.
EFFECT: invention simplifies technology, enables to obtain high-temperature heat-insulating material with low heat-conductivity and sufficient strength.
11 cl, 1 tbl
| Title | Year | Author | Number |
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|
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