Inorganic salt impregnation process for anti-oxidation of carbon graphite products

Abstract

The invention relates to the field of preparation of carbon graphite materials, in particular to a process of impregnating an inorganic salt for oxidation resistance of carbon graphite products. The process includes steps 1) pressurized impregnation, heating the product in an oven, putting the heated product into the impregnation barrel, and then putting the impregnation barrel together into a stainless steel vacuum tank to extract the vacuum; 1.2) under the condition of maintaining vacuum, Introduce the impregnation liquid a heated to boiling state into the impregnation vacuum tank; after the impregnation liquid submerges the product, let in the air, and finally open the vacuum tank, take out the product and the impregnation barrel; 1.3) Put the product and the impregnation barrel into the lower bell jar of the hydraulic press , and then sequentially perform sealing, adding air pressure, maintaining pressure, releasing pressure, pouring out the impregnation solution, and taking out the product; 2) curing the product; 3) secondary impregnation. Through this process, the problem of high-temperature oxidation resistance of carbon graphite products is solved, and the anti-oxidation weight loss rate is 5% lower in the air at 650°C, the density increase rate is ≮6%, and the treated material has no moisture absorption in the air.

Description

technical field

[0001] The invention relates to the technical field of preparation of carbon graphite materials, in particular to a process of impregnating an inorganic salt for oxidation resistance of carbon graphite products. Background technique

[0002] With the continuous development of science and technology, carbon graphite materials have become important materials in contemporary industry. Carbon graphite materials have unique self-lubricating properties, low thermal expansion rate and good wear resistance, and are widely used in the sealing field. A series of advantages such as high thermal resistance, high thermal shock resistance, low thermal expansion, low elasticity and easy finishing make it widely used in aero-engines and become an indispensable material for engine sealing.

[0003] Carbon graphite material is a granular structure material, which is made of various raw materials by adding binders, kneading, forming, roasting, and graphitization. During the m...

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