Method for improving heat shock resistance and strength of ZrB2-SiC superhigh temperature ceramic material

A technology of ultra-high temperature ceramics and thermal shock resistance, which is applied in the field of improving the thermal shock resistance and strength of ceramic materials, can solve the problems of poor strength and poor thermal shock resistance, and achieves improved strength, thermal shock resistance, and thermal resistance. The effect of impact performance

Inactive Publication Date: 2010-06-23
HARBIN INST OF TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] The present invention provides a ZrB 2 -Methods for thermal shoc

Method used

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  • Method for improving heat shock resistance and strength of ZrB2-SiC superhigh temperature ceramic material
  • Method for improving heat shock resistance and strength of ZrB2-SiC superhigh temperature ceramic material
  • Method for improving heat shock resistance and strength of ZrB2-SiC superhigh temperature ceramic material

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specific Embodiment approach 1

[0007] Specific implementation mode one: this implementation mode improves ZrB 2 -The method for thermal shock resistance and strength of SiC ultra-high temperature ceramic materials is carried out according to the following steps: 1. Take 70-85 parts of zirconium boride powder and 15-30 parts of silicon carbide powder according to the ratio of parts by weight; Put the weighed zirconium boride powder and silicon carbide powder in a star ball mill to mix and disperse, the dispersion medium is absolute ethanol, the speed of the ball mill is 180-200r / min, the mass ratio of the ball mill is 4:1, The amount added is 3 to 5 times the total mass of zirconium boride powder and silicon carbide powder mixed; 3. Dry the mixture obtained in step 2 at 60-65°C to obtain mixed powder; 4. Put the mixed powder in In a graphite mold, sinter in a vacuum or inert atmosphere. The sintering temperature is 1900-2000°C, the sintering pressure is 28-32MPa, the sintering time is 40-60min, and then cool...

specific Embodiment approach 2

[0012] Embodiment 2: This embodiment differs from Embodiment 1 in that the average particle size of the zirconium boride powder in step 1 is 1-5 μm, and the purity of the zirconium boride powder is 98%-99.9%. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0013] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the average particle size of the silicon carbide powder in step 1 is 30 nm-2 μm, and the purity of the silicon carbide powder is 98%-99.9%. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention discloses a method for improving the heat shock resistance and the strength of a ZrB2-SiC superhigh temperature ceramic material, which relates to a method for improving the heat shock resistance and the strength of a ceramic material and solves the problem that the traditional ZrB2-SiC based superhigh temperature ceramic material has poor heat shock resistance and strength. The method comprises the following steps: firstly, weighing raw materials; secondly, ball milling and dispersing; thirdly, drying; fourthly, sintering; fifthly, oxidizing; and sixthly, heating and maintaining the temperature, so the heat shock resistance and the strength of the ZrB2-SiC superhigh temperature ceramic material can be improved. The method effectively improves the heat shock resistance and the strength of the ZrB2-SiC superhigh temperature ceramic material; and compared with the traditional ZrB2-SiC based superhigh temperature ceramic material, the heat shock resistance is improved by about 50 percent and the mechanical property is improved by about 30 percent.

Description

technical field [0001] The present invention relates to a method of increasing the thermal shock resistance and strength of ceramic materials. Background technique [0002] Zirconium diboride-based ceramics have the characteristics of high melting point, high hardness, good electrical and thermal conductivity, and good neutron control ability, and can be widely used in high-temperature structural ceramics, composite materials, electrode materials, thin film materials, refractory materials, and nuclear control materials. and other fields. Ultra-high temperature ceramic material refers to a special ceramic material that can maintain physical and chemical stability in high temperature environment and reaction atmosphere. Such materials mainly include transition metal borides, carbides and nitrides, all of which have melting points exceeding 3000°C. Among them, transition metal borides have become the most advantageous high-temperature structural ceramic materials due to their...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B35/58
Inventor 张幸红胡平韩杰才孟松鹤王智
Owner HARBIN INST OF TECH
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