Preparation method of silicon carbide ceramic sealing material

Abstract

The invention belongs to the technical field of preparation of sealing materials and particularly relates to a preparation method of a silicon carbide ceramic sealing material. The preparation methodtakes rice husk ash as a raw material and comprises the following steps: adding palm wax and peels to obtain fermentation filter dreg; mixing the fermentation filter dreg and diamond grains to obtainridged powder; putting the rigid powder into a muffle furnace and roasting to obtain self-lubricating silicon carbide micro-powder; mixing the self-lubricating silicon carbide micro-powder with additives including maganthophyllite powder, white corundum, walnut shell powder and the like to obtain a material to be sintered; finally, putting the material to be sintered into a graphite mold to obtainthe silicon carbide ceramic sealing material. Nitrogen-containing composite powder and a boron-containing ceramic binding agent are mixed and then are hotly pressed and sintered to form a hexagonal boron nitride crystal, so that the wear-resisting performance and self-lubricating performance of the sealing material are improved; the fermentation filter dreg containing the rice husk ash is reducedand carbonized on the surface of a diamond, and the densification of the sealing material is promoted; then a polytetrafluoroethylene film is sprayed to form an impermeable lubricating protection layer on the surface of the sealing material; the silicon carbide ceramic sealing material has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of sealing material preparation, and in particular relates to a method for preparing a silicon carbide ceramic sealing material. Background technique [0002] In industrial production and daily life, sealing is of great significance. Advanced sealing means can not only improve the operating cycle of equipment, reduce consumption, save energy, reduce pollution, but also an important guarantee for safe production. The performance of the sealing material is the primary factor in determining the reliability of the seal. Sealing materials refer to materials that can withstand joint displacement to achieve airtight and watertight purposes, and are embedded in joints such as devices and buildings. Sealing materials involve almost all industrial and civil fields, and play an important role in national defense, chemical industry, coal, petroleum, metallurgy, transportation, machinery manufacturing industry and aero...

AI Technical Summary

Problems solved by technology

[0008] The technical problem mainly solved by the present invention is aimed at the defect that silicon carbide ceramics as a mechanical sealing material has poor self-lubricating performance, and in a dry friction state, it will easily fail due to a large friction coefficient, and the wear rate will also increase accordingly. A kind of preparation method of silicon carbide ceramic sealing material