Ceramic composite material containing graphite and silicon carbide and preparation method thereof

Abstract

The invention relates to a ceramic composite material containing graphite and silicon carbide and a preparation method thereof, relates to a composite material and a preparation method thereof, and is used for solving the problems that the traditional ceramic composite material does not have the characteristics of corrosion resistance, wear resistance, low friction coefficient and thermal impact resistance. The first scheme is as follows: the composite material is composed of 5-30 parts of graphite, 65-90 parts of silicon carbide and 5 parts of silica fume by volume. The second scheme is as follows: the preparation method comprises the following steps: (1) uniformly mixing graphite powder and silicon carbide powder in a ball milling tank; (2) pressing in a steel mold to obtain powder green compact, wherein the pressure is 150-200 MPa; (3) infiltrating the powder green compact in molten silicon liquid for 1-3 hours, applying 0.5-10 MPa argon gas pressure on the surface of the molten silicon liquid during the infiltration process, and taking out infiltrated powder green compact; and (4) sintering the powder green compact in a sintering furnace at the temperature of 1700-1800 DEG C for 2-5 hours. The preparation method is used for preparing the composite material.

Description

technical field [0001] The invention relates to a composite material and a preparation method thereof. Background technique [0002] Alumina or silicon carbide ceramic materials or high-quality graphite materials are commonly used for sliding bearings or mechanical seal rings in various pumps of fluid transportation equipment. The above-mentioned ceramic materials have the characteristics of corrosion resistance, wear resistance and long life, and are widely used especially in the working conditions of transporting corrosive media such as strong acid and alkali. The graphite material has corrosion resistance and excellent lubricating properties and has been widely used in actual working conditions. In seals, ceramic and graphite are often used in combination. However, in actual production, the water pump often starts dry or works without water, which causes the sliding bearings or seals in the pump to move relative to each other at high speed, friction heat, and rapid temp...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a graphite-containing silicon carbide ceramic composite material and its preparation method to solve the problems that the current ceramic composite materials do not have the characteristics of corrosion resistance, wear resistance, small friction coefficient and thermal shock resistance