Preparation process of high-hardness and high-toughness silicon nitride ceramic complex structural member

Abstract

The invention discloses a preparation process of a high-hardness and high-toughness silicon nitride ceramic complex structural member, and relates to the technical field of preparation processes of silicon nitride ceramic materials. The preparation process comprises the following steps of: 1, preparing silicon nitride composite powder; 2, performing cold isostatic pressing treatment on the silicon nitride composite powder to obtain a silicon nitride ceramic blank; 3, cutting the silicon nitride ceramic blank to obtain a silicon nitride ceramic complex structural part blank; 4, performing low-temperature and low-pressure pre-sintering on the silicon nitride ceramic complex structural part blank; and 5, performing high-temperature and high-pressure sintering. By adopting the method, a silicon nitride ceramic complex structural part with high surface hardness and good internal toughness can be obtained, the problem that high hardness and high toughness of a silicon nitride ceramic structural part cannot be both achieved in the prior art can be effectively solved, the wear resistance requirement of the silicon nitride ceramic part can be met, and the breakage resistance of the structural part can be improved. The process has a great application potential in the fields of wear-resistant structural members, ceramic cutters and the like.

Description

technical field [0001] The invention relates to the technical field of preparation technology of silicon nitride ceramic materials, in particular to a preparation technology of complex structural parts of high-hardness and high-toughness silicon nitride ceramics. Background technique [0002] Silicon nitride ceramics have excellent fracture toughness and flexural strength and have been successfully applied to wear-resistant structural parts with complex structures such as high-precision bearing balls, high-speed impellers, and ceramic pistons. Atmosphere sintering is a commonly used preparation process for ceramic materials. Usually, high-pressure nitrogen is used as a protective gas, which can realize the densification of ceramics with complex structures and mass production, especially in the preparation of complex structural parts of silicon nitride ceramics. Widely used . [0003] For silicon nitride ceramic materials, the crystal structure usually contains equiaxed α-Si...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation process for complex structural parts of high-hardness and high-toughness silicon nitride ceramics, to solve the problem of performance regulation of complex structural parts of silicon nitride, so as to ensure that ceramic components can have stable and reliable performance indicators to meet service requirements

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