A kind of preparation technology of high-hardness and high-toughness silicon nitride ceramic complex structure
A silicon nitride ceramic and complex structure technology is applied in the field of preparation technology of high-hardness and high-toughness silicon nitride ceramic complex structural parts, and achieves the effects of high surface hardness, good internal toughness, and improved damage resistance.
Active Publication Date: 2022-07-05
BEIJING INSTITUTE OF TECHNOLOGYGY
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[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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[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0027] The purpose of the present invention is to provide a preparation process for high-hardness and high-toughness silicon nitride ceramic complex structural parts, to solve the problem of performance regulation of silicon nitride complex structural parts, so as to ensure that the ceramic parts can have stable and reliable performance indicators to meet service requirements .
[0028] In order to make the above objects, features a...
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Abstract
The invention discloses a preparation process for a high-hardness and high-toughness silicon nitride ceramic complex structural member, and relates to the technical field of preparation technology for silicon nitride ceramic materials, comprising the following steps: step 1, preparing silicon nitride composite powder; The silicon nitride composite powder is subjected to cold isostatic pressing to obtain a silicon nitride ceramic blank; step 3, the silicon nitride ceramic blank is machined to obtain a silicon nitride ceramic complex structure blank; step 4, the nitrided ceramic blank is obtained The silicon ceramic complex structural body is pre-sintered at low temperature and low pressure; in step 5, sintering at high temperature and high pressure is performed. By adopting the invention, a complex structure of silicon nitride ceramics with high surface hardness and good internal toughness can be obtained, which can effectively solve the problem of high hardness and high toughness of silicon nitride ceramic structures in the prior art. The wear resistance requirements of ceramic parts can also improve the damage resistance of structural parts, which has great application potential in the fields of wear-resistant structural parts and ceramic tools.
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 a complex structural member of high-hardness and high-toughness silicon nitride ceramics. Background technique [0002] Silicon nitride ceramics have excellent fracture toughness and flexural strength, and are successfully used in wear-resistant structural parts with complex structures such as high-precision bearing balls, high-speed impellers, and ceramic pistons. Atmosphere sintering is a common preparation process for ceramic materials. High-pressure nitrogen is usually used as a protective gas, which can realize the densification of ceramics with complex structures and mass production, especially in the preparation of silicon nitride ceramic complex structures. Widely used . [0003] For silicon nitride ceramic materials, the crystal structure usually contains equiaxed α-Si 3 N 4 and hexagonal ...
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IPC IPC(8): C04B35/584C04B35/622C04B35/64
CPCC04B35/584C04B35/622C04B35/64C04B2235/612C04B2235/3225C04B2235/3217C04B2235/77C04B2235/96
Inventor 赵斌王瑞斌王西彬周天丰焦黎解丽静刘志兵梁志强颜培仇天阳沈文华滕龙龙
Owner BEIJING INSTITUTE OF TECHNOLOGYGY