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Non-oxide MAX-phase toughened and toughened silicon nitride ceramic composite material and preparation method thereof

A technology of silicon nitride ceramics and composite materials, which is applied in the field of non-oxide MAX phase toughened silicon nitride ceramic composite materials, can solve the problems of poor machinability, etc., to promote strengthening and toughness, improve machinability, and improve The effect of sintering efficiency

Active Publication Date: 2021-08-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of thermal structure ceramic Si 3 N 4 Due to the low eutectic temperature, the problems of softening, slippage and significant high-temperature creep behavior and poor processability are prone to occur under high-temperature stress loading conditions. The purpose of the present invention is to adopt a typical cermet MAX phase Ti 3 SiC 2 This kind of non-oxide sintering aid replaces the traditional preparation method of metal oxide-rare earth oxide sintering aid, and obtains silicon nitride ceramic composite material with high temperature creep resistance and conductive machinability

Method used

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  • Non-oxide MAX-phase toughened and toughened silicon nitride ceramic composite material and preparation method thereof
  • Non-oxide MAX-phase toughened and toughened silicon nitride ceramic composite material and preparation method thereof
  • Non-oxide MAX-phase toughened and toughened silicon nitride ceramic composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] via as attached figure 2 The process shown for the preparation of silicon nitride ceramic composites specifically includes:

[0034] Accurately weigh two groups of ceramic powders containing silicon nitride (α-Si 3 N 4 powder) and sintering aid Ti 3 SiC 2 Raw material combination of powder, each group of raw material combination contains α-Si 3 N 4 Powder and Ti 3 SiC 2 The mass ratio of the powder is 1.44:100, 4.41:100, 7.51:100, 15.86:100, 25.18:100, 35.68:100 (the corresponding volume ratio is 99:1, 97:3, 95:5, 90:10, 85 :15, 80:20) multiple combinations;

[0035] (2) Using the method of planetary wet ball milling, the weighed α-Si 3 N 4 with Ti 3 SiC 2 The powder, an appropriate amount of ball milling medium and absolute ethanol were placed in a stainless steel ball mill tank lined with polytetrafluoroethylene for wet mixing, and were ball milled at a speed of 200 rpm for 10 hours through a planetary ball mill and zirconia ball mill beads, and each Rev...

Embodiment 2

[0040] The silicon nitride ceramic composite material obtained in Example 1 is characterized as follows:

[0041] Based on the measurement principle of Archimedes drainage method, according to ASTMD297-93, D792-00, D618, D891, GB / T1033, JISK6530, ISO2781 test standards, using HTY-120E high-precision solid density tester to measure the apparent density and opening of the sample Ratio, obtain the density of multiple silicon nitride ceramic composite materials obtained, and compare it with the ratio of theoretical density, the results are shown in the attached image 3 As shown, where the theoretical density is calculated as follows:

[0042]

[0043] In the formula, ρ T ——Theoretical density of silicon nitride ceramic composite material (g / cm 3 );

[0044] ρ 1 ——Silicon nitride density (g / cm 3 );

[0045] ρ 2 ——Ti 3 SiC 2 Density (g / cm 3 );

[0046] m 1 - mass of silicon nitride raw material (g);

[0047] m 2 ——Ti 3 SiC 2 Raw material mass (g).

[0048] pass ...

Embodiment 3

[0055] Carry out X-ray diffraction spectrum and microstructure characterization to the silicon nitride ceramic composite material gained in embodiment 1, as attached Figure 7-8 As shown, it can be seen that the present invention uses the non-oxide sintering aid Ti 3 SiC 2 The prepared silicon nitride ceramic composite is mainly composed of high temperature stable β-Si 3 N 4 Phase, C 0.3 N 0.7 Ti phase and SiC phase composition, and C 0 . 3 N 0.7 The diffraction characteristic peaks at 36.46° and 42.35° of the Ti phase and the peak heights of the SiC phase diffraction peaks show an obvious strengthening trend with the increase of the content of sintering aids, and the C 0.3 N 0.7 The Ti phase and SiC phase are evenly distributed around the hexagonal rod-shaped silicon nitride grains.

[0056] attached Figure 8 The cross-sectional micromorphology of silicon nitride ceramics prepared by hot pressing at 1700 °C under different contents of sintering aids. It can be seen...

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Abstract

The invention discloses a non-oxide MAX phase strengthened and toughened silicon nitride ceramic composite material and a preparation method thereof, the preparation method takes Ti3SiC2 as a sintering aid, and Si3N4 powder is subjected to hot pressed sintering in an inert atmosphere to obtain the non-oxide MAX phase strengthened and toughened silicon nitride ceramic composite material. The preparation method is simple in process and high in preparation efficiency, and the obtained material is the MAX-phase silicon nitride ceramic composite material with high toughness, high strength, high density and good electrical properties.

Description

technical field [0001] The invention relates to the technical field of non-oxide MAX phase toughened silicon nitride ceramic composite materials. Background technique [0002] Silicon nitride (Si 3 N 4 ) Ceramics have excellent comprehensive properties such as mechanical properties, high temperature resistance, corrosion resistance and wear resistance. They are used in aerospace industry (such as rocket nozzles, throat linings, piston tops and other high Bearings, ceramic knives, etc.), chemical industry (such as seal rings, filters, heat exchanger parts, etc.), semiconductor industry (such as circuit substrates, film capacitors, etc.) Carriers of fissile substances, etc.) and other fields play a unique role. [0003] But existing Si 3 N 4 Ceramics still have two problems of poor high temperature creep resistance and difficult processing, which seriously restrict Si 3 N 4 The promotion and application of ceramics as hot end components in high temperature stress load s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/64C04B35/584
CPCC04B35/593C04B2235/3843C04B2235/6562C04B2235/3856C04B2235/3826C04B2235/96
Inventor 罗衡李杨张海斌
Owner CENT SOUTH UNIV
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