Preparation method of tough wear-resistant silicon nitride based composite ceramic

A silicon nitride-based, composite ceramic technology is applied in the field of new materials to achieve high-temperature toughness and anti-wear performance, eliminate gaps, and reduce cost problems.

Active Publication Date: 2019-09-20
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, fracture brittleness is always one of the main factors limiting the development of silicon nitride, depending on the inherent covalently bonded crystal structure of ceramics and less grain boundary slip

Method used

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  • Preparation method of tough wear-resistant silicon nitride based composite ceramic
  • Preparation method of tough wear-resistant silicon nitride based composite ceramic
  • Preparation method of tough wear-resistant silicon nitride based composite ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 A method for preparing a tough and wear-resistant silicon nitride-based composite ceramic, comprising the following steps:

[0029] ⑴In terms of mass percentage, 95% of α-Si 3 N 4 powder and 5% C 4 h 6 CoO 4 • 4H 2 After mixing the O aqueous solution, stir it magnetically at 100°C at 500rmp for 5h until the solvent is completely evaporated to dryness to obtain the mixed powder;

[0030] (2) After the mixed powder is crushed through a 100-mesh sieve, it is put into a cylindrical steel mold with a diameter of 25 mm for pre-pressing, the pressure is 120 MPa, and the holding time is 10 s to obtain a pre-pressed sample;

[0031] (3) After demolding the pre-compressed sample, put it into a cylindrical graphite with a diameter of 25 mm. The pressure is 30 MPa, the sintering temperature is 1680 ° C, the heating rate is 200 ° C / min, the holding time is 3 min, and the vacuum degree is 10 -2 Under the condition of Pa, it is sintered under high temperature and hig...

Embodiment 2

[0035] Example 2 A method for preparing a tough and wear-resistant silicon nitride-based composite ceramic, comprising the following steps:

[0036] ⑴In terms of mass percentage, 90% of α-Si 3 N 4 powder and 10% C 4 h 6 CoO 4 • 4H 2 After mixing the O aqueous solution, stir it magnetically at 100°C at 500rmp for 5h until the solvent is completely evaporated to dryness to obtain the mixed powder;

[0037] (2) After the mixed powder is crushed through a 100-mesh sieve, it is put into a cylindrical steel mold with a diameter of 25 mm for pre-pressing, the pressure is 120 MPa, and the holding time is 10 s to obtain a pre-pressed sample;

[0038] (3) After demolding the pre-compressed sample, put it into a cylindrical graphite with a diameter of 25 mm. The pressure is 30 MPa, the sintering temperature is 1680 ° C, the heating rate is 200 ° C / min, the holding time is 3 min, and the vacuum degree is 10 -2 Under the condition of Pa, it is sintered under high temperature and hi...

Embodiment 3

[0042] Example 3 A method for preparing a tough and wear-resistant silicon nitride-based composite ceramic, comprising the following steps:

[0043] ⑴In terms of mass percentage, 80% of α-Si 3 N 4 powder and 20% C 4 h 6 CoO 4 • 4H 2 After mixing the O aqueous solution, stir it magnetically at 100°C at 500rmp for 5h until the solvent is completely evaporated to dryness to obtain the mixed powder;

[0044] (2) After the mixed powder is crushed through a 100-mesh sieve, it is put into a cylindrical steel mold with a diameter of 25 mm for pre-pressing, the pressure is 120 MPa, and the holding time is 10 s to obtain a pre-pressed sample;

[0045] (3) After demolding the pre-compressed sample, put it into a cylindrical graphite with a diameter of 25 mm. The pressure is 30 MPa, the sintering temperature is 1680 ° C, the heating rate is 200 ° C / min, the holding time is 3 min, and the vacuum degree is 10 -2 Under the condition of Pa, it is sintered under high temperature and hi...

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Abstract

The invention relates to a preparation method of a tough wear-resistant silicon nitride based composite ceramic. The preparation method comprises following steps: (1) mixing following components in percentage by weight: 80 to 95% of alpha-Si3N4 powder and 5 to 20% of a C4H6CoO4.4H2O water solution, and stirring the solution by a magnetic force under a heating condition until the solvent is totally evaporated to obtain mixed powder; (2) crushing the mixed powder, sieving the mixed powder by a 100-mesh sieve, filling the mixed powder into a steel die, and pre-pressing the mixed powder to obtain a pre-pressed sample; (3) sintering the pre-pressed sample at a high temperature under a high pressure, and cooling the sample in the furnace to obtain a blank; and (4) polishing the surface of the blank to obtain silicon nitride based composite ceramic. The technology is simple and controllable, the production efficiency is high, the powder does not need any special treatment, and the preparation method is suitable for massive production. The high temperature toughness and wear resistant performance of the prepared finished product are excellent. The service life of ceramic parts in a high temperature environment is largely prolonged.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a preparation method of a tough and wear-resistant silicon nitride-based composite ceramic. Background technique [0002] In recent years, with the development of my country's chemical industry, national defense, metallurgy, electronics, aerospace and other fields, advanced ceramic materials have played an irreplaceable role in the national economy and national defense construction. Compared with functional ceramics, structural ceramics have high hardness, high strength, high temperature resistance and good thermal vibration stability, and can be processed into cutting tools, molds, wear-resistant parts, engine parts, heat exchangers and armor, etc. One of the industries that the country gives priority to support development. Among them, silicon nitride ceramics have become the focus of research by scholars at home and abroad because of their high thermal conductivity and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/587C04B35/584C04B35/622
CPCC04B35/584C04B35/587C04B35/622C04B2235/3891
Inventor 乔竹辉刘炯杰杨军朱圣宇程军于源刘维民
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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