Sintering method of ZrB2-SiC superhigh temperature ceramics

A technology of ultra-high temperature ceramics and sintering method, which is applied in the field of sintering of ultra-high temperature ceramics, which can solve the problems of high energy consumption and high sintering temperature, and achieve the effects of large specific surface area, lower sintering temperature and energy consumption

Inactive Publication Date: 2012-07-18
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention is to solve existing preparation ZrB 2 -The process of SiC ultra-high temperature ceramics has the problems of high sintering temperature and high energy consumption, and a ZrB 2 -Sintering method of SiC ultra-high temperature ceramics

Method used

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  • Sintering method of ZrB2-SiC superhigh temperature ceramics
  • Sintering method of ZrB2-SiC superhigh temperature ceramics

Examples

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specific Embodiment approach 1

[0010] Specific implementation mode one: a kind of ZrB in this implementation mode 2 -The sintering method of SiC ultra-high temperature ceramics is carried out according to the following steps: 1. Weigh ZrB 2 powder, SiC powder and citric acid, ZrB 2 The volume ratio of SiC powder and SiC powder is (3~5):1, and the mass of citric acid is ZrB 2 1% to 3% of the total mass of powder and SiC powder, ZrB 2 The average particle size of SiC powder and SiC powder is 50-70nm; 2. Add absolute ethanol to the ball mill tank as a solvent medium, and then add the citric acid, ZrB 2 powder and SiC powder, ball milling to disperse to obtain a slurry; 3. Dry the slurry obtained in step 2 to obtain a composite powder; 4. Put the composite powder in a graphite mold and sinter under vacuum conditions, and the sintering temperature is 1500~ 1600°C, the sintering pressure is 25-35MPa, the sintering time is 1-1.5h, and then cooled to room temperature to obtain ZrB 2 -SiC ultra-high temperature ...

specific Embodiment approach 2

[0013] Specific embodiment two: the difference between this embodiment and specific embodiment one is: ZrB in step one 2 The average particle size of SiC powder and SiC powder is 55-65nm. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0014] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: in step one, ZrB 2 The volume ratio of SiC powder and SiC powder is (3.5~4):1, and the mass of citric acid is ZrB 2 1.5% to 2.5% of the total mass of SiC powder and SiC powder. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a sintering method of ZrB2-SiC superhigh temperature ceramics and relates to a sintering method of superhigh temperature ceramics. The invention aims at solving the problems of high sintering temperature and high energy consumption in the existing process of preparing ZrB2-SiC superhigh temperature ceramics. The method comprises the following steps of: weighing ZrB2 powder, SiC powder and citric acid; ball-milling and mixing to obtain slurry; drying the slurry to obtain composite powder; and performing vacuum sintering at the temperature of 1500 to 1600 DEG C to obtain the ZrB2-SiC superhigh temperature ceramics. According to the sintering method of the ZrB2-SiC superhigh temperature ceramics provided by the invention, the sintering temperature is lowered by about 300 DEG C, thus energy consumption is reduced. The density of the obtained product can achieve 98%, thus the requirement of being used in oxygen-containing atmosphere at the temperature of 1800 DEG C is met. The method is used for preparing the ZrB2-SiC superhigh temperature ceramics.

Description

technical field [0001] The invention relates to a sintering method of ultra-high temperature ceramics. Background technique [0002] In the ultra-high temperature ceramic material system, ZrB 2 Due to its relatively low density (6.09g·cm -3 ), higher melting point (3245°C), higher hardness (Mohs hardness is 9, microhardness is 22.1GPa), good thermal conductivity (thermal conductivity is 23-25W·m -1 ·K -1 ) and good electrical conductivity (conductivity at room temperature is ~1×108S m -1 ) and other characteristics, it has been widely used and paid attention to in the fields of high-temperature structural ceramic materials and ceramic matrix composite materials. In recent years, with the development of aerospace industry, ZrB 2 The research on ultra-high-temperature ceramic materials based on ultra-high temperature ceramics has been highly valued by developed countries, and has become one of the materials with extremely rapid development, especially in the aspect of oxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/622
Inventor 胡平张幸红侯杨何汝杰金鑫鑫
Owner HARBIN INST OF TECH
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