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Preparation method of ZrB2-SiC composite ceramic

A technology of composite ceramics and zrb2-sic, which is applied in the field of preparing ZrB2-SiC composite ceramics by high-temperature vacuum sintering method, can solve the problems of easy oxidation and brittleness, catastrophic damage of components, difficult sintering, etc., and achieves easy preparation, high product rate, The effect of simple method

Inactive Publication Date: 2017-03-08
HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

ZrB 2 Ceramics (zirconium diboride ceramics) are common ultra-high temperature ceramics, but this material also has many shortcomings, such as: difficult to sinter into a dense sintered body, easy to oxidize at high temperature, and its own brittleness can easily lead to catastrophic failure of components

Method used

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  • Preparation method of ZrB2-SiC composite ceramic
  • Preparation method of ZrB2-SiC composite ceramic
  • Preparation method of ZrB2-SiC composite ceramic

Examples

Experimental program
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Embodiment 1

[0031] Such as figure 1 As shown, the present embodiment prepares ZrB according to the following steps 2 -SiC composite ceramics:

[0032] (1) Mixing: commercially available ZrO 2 , B 4 C and C powder are used as raw materials. The particle sizes of these three materials are all less than 10µm and the particle sizes of the three are different. ZrO 2 , B 4 The molar ratio of C and C powder is 2:1:3. After weighing, pour them into the ball mill jar, use ZrO 2 Carry out ball milling and mixing for 8 hours to achieve the effect of uniform mixing. The mixed powder is heat-treated in a vacuum furnace, put the mixed powder into an alumina ceramic cup, put it into a vacuum sintering furnace, and heat it to 1600°C for 1 hour for calcination to obtain ZrB 2 Powder.

[0033] The reaction equation is as follows:

[0034] 2ZrO 2 +B 4 C+3C→2ZrB 2 +4CO (1)

[0035] Using the above ZrO 2 -B 4 ZrB synthesized by C-C system 2 With SiC powder as the raw material, the particle size ...

Embodiment 2

[0042] Such as figure 2 As shown, the present embodiment prepares ZrB according to the following steps 2 -SiC composite ceramics:

[0043] (1) Mixture:

[0044] Using commercially available ZrO 2 , B 2 o 3 , C powder as raw materials, the particle size of these three raw materials is less than 10µm and the particle size of the three is different, ZrO 2 , B 2 o 3 , The molar ratio of C powder is 1:1.10:5.00. After weighing, pour them into the ball mill jar, use ZrO 2 Carry out ball milling and mixing for 8 hours to achieve the effect of uniform mixing.

[0045] The mixed powder is heat-treated in a vacuum furnace, put the mixed powder into an alumina ceramic cup, put it into a vacuum sintering furnace, and heat it to 1600°C for 1 hour for calcination to obtain ZrB 2 Powder.

[0046] The reaction equation is as follows:

[0047] ZrO 2 +B 2 o 3 +5C→ ZrB 2 +5CO (2)

[0048] Using the above ZrO 2 -B 2 o 3 ZrB synthesized by -C system 2 With SiC powder as the r...

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Abstract

The invention discloses a preparation method of ZrB2-SiC composite ceramic. The preparation method includes the steps of firstly, sufficiently mixing ZrB2 powder and SiC in a ball milling tank, and calcining the mixed powder in a vacuum furnace to obtain ZrB2-SiC mixed powder; secondly, adding adhesive into the ZrB2-SiC powder, evenly stirring, loading into a mould to perform compression moulding, and demoulding to obtain a biscuit; thirdly, flatly placing the biscuit on a high-purity aluminum oxide ceramic plate, sintering the ceramic plate with the biscuit in a vacuum sintering furnace, and cooling along with the furnace to obtain the ZrB2-SiC composite ceramic. The preparation method has the advantages that the ZrB2-SiC composite ceramic is prepared by using the vacuum sintering method, ZrB2-SiC does not have direct reaction, and deviated component proportion is avoided; the ZrB2-SiC composite ceramic is easy in preparation operation, and yield is increased effectively.

Description

technical field [0001] The invention belongs to the technical field and relates to a ZrB 2 -The preparation method of SiC composite ceramics, specifically relates to a kind of adopting high-temperature vacuum sintering method to prepare ZrB 2 - A method of SiC composite ceramics. Background technique [0002] ZrB 2 -SiC composite ceramics are advanced ceramics that can still be used as usual under harsh environmental conditions such as oxygen atmosphere above 2000°C as Ultra High Temperature Ceramics (UHTCs for short). ZrB 2 Zirconium diboride ceramics is a common ultra-high temperature ceramic, but this material also has many shortcomings, such as: difficult to sinter into a dense sintered body, easy to oxidize at high temperature, and its own brittleness can easily lead to catastrophic failure of components . Studies have shown that the addition of SiC can not only improve the ZrB 2 The sintering performance of ceramics is improved, and its oxidation resistance and m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/64
CPCC04B35/58078C04B35/64C04B2235/3826C04B2235/5436C04B2235/6581
Inventor 刘宝良李长青冯晓艳程玲孙立红
Owner HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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