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Method for preparing texturing boride super-high-temperature ceramic

An ultra-high temperature ceramic and boride technology, which is applied in the field of preparation of non-oxide composite ceramic materials, can solve problems such as no obvious improvement in mechanical properties, and achieve the effects of improved performance, obvious thermal conductivity and high degree of texture.

Active Publication Date: 2013-06-05
江苏先进无机材料研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although boride ceramics are hexagonal crystals, boride ceramics prepared by a strong magnetic field are still equiaxed grains in microscopic morphology, and their mechanical properties are not significantly improved compared with untextured ceramics

Method used

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  • Method for preparing texturing boride super-high-temperature ceramic
  • Method for preparing texturing boride super-high-temperature ceramic
  • Method for preparing texturing boride super-high-temperature ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Weighing according to the stoichiometric ratio: 45.612 grams of Zr powder, 10.811 grams of B powder, 2.399 grams of Mo powder and 1.404 grams of Si powder, mixed; with acetone as solvent, at a speed of 560 rpm, with ZrO 2 The ball and planet ball milled for 8 hours, and the resulting slurry was dried by rotary evaporation to obtain a uniformly mixed powder; the uniformly mixed powder was compacted with a dry press, placed in a graphite mold, and reacted and synthesized in a vacuum, and the temperature was raised The rate is 10°C / min, the temperature is raised to 1400°C and kept for 1 hour; after the heat preservation is completed, the multiphase powder containing boride seed crystals is obtained by natural cooling; the prepared multiphase powder containing boride seed crystals is mixed with boride After the ceramic powder is mixed in a molar ratio of 1:9, it is added to a mixed solution of ethanol and butanone (ethanol: butanone=1:2, volume ratio), and a dispersant (glyc...

Embodiment 2

[0042] Weigh according to the stoichiometric ratio: Zr powder 45.612 grams, B powder 10.811 grams, Mo powder 9.114 grams and Si powder 5.336 grams, mix.

[0043] All the other contents are the same as those described in Example 1.

[0044] It is found from the test that the relative density of the prepared textured boride-based ultra-high temperature ceramics is 98.7%; the Lotgering orientation factor f(00l) is 0.92; the bending strength of the sample: vertical to the hot pressing direction, 913 MPa; parallel to the hot pressing direction , 759MPa.

Embodiment 3

[0046] Weigh according to the stoichiometric ratio: Zr powder 45.612 grams, B powder 10.811 grams, Mo powder 23.985 grams and Si powder 14.043 grams, mix.

[0047] All the other contents are the same as those described in Example 1.

[0048] It is found from the test that the relative density of the prepared textured boride-based ultra-high temperature ceramics is 99.0%; the Lotgering orientation factor f(00l) is 0.95; the bending strength of the sample: vertical to the hot pressing direction, 882 MPa; parallel to the hot pressing direction , 746MPa.

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Abstract

The invention discloses a method for preparing texturing boride super-high-temperature ceramic. The method for preparing the texturing boride super-high-temperature ceramic comprises the steps that IVB group metal simple substance, amorphous boron powder, silica powder, and transition metal are adopted as raw materials, and complex-phase powder containing boride seed crystal and silicide particles is prepared; and slurry is prepared by mixing the complex-phase powder and boride ceramic powder, a ceramic body is prepared by means of the casting process technology or high-intensity magnetic field orientation process technology, and then hot pressed sintering is carried out on the ceramic body. According to the method for preparing the texturing boride super-high-temperature ceramic, the boride seed crystal is enabled to grow in the ceramic body in a orientation-arrangement mode due to the preparation of boride seed crystal with anisotropic microstructure and the adoption of the casting process technology or high-intensity magnetic field orientation process technology for preparation of the ceramic body, and then the texturing boride super-high-temperature ceramic with anisotropic crystal particle morphology is prepared. According to the ceramic prepared with the method, relative density is more than 98%, material Lotgering orientation factor f (001) can reach to 0.95, and obvious anisotropism can be represented by each performance.

Description

technical field [0001] The invention relates to a method for preparing textured boride-based ultra-high temperature ceramics, in particular to a method for preparing textured boride-based ultra-high temperature ceramics based on a template grain growth method, which belongs to non-oxide complex phase Technical field of ceramic material preparation. Background technique [0002] Transition metal boride MB 2 (M=Ti, Zr, Hf) has become an important candidate material for ultra-high temperature ceramics due to its high melting point, high hardness and good thermal conductivity, and is expected to be used as high-temperature heat-resistant components in the industrial field. However, single-phase boride ceramics are difficult to densify and have poor oxidation resistance at high temperatures (>1100°C). Studies have shown that by adding molybdenum disilicide (MoSi 2 ) and other silicides can promote the densification of boride ceramics, and can also significantly improve thei...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/622
Inventor 张国军刘海涛王新刚阚艳梅
Owner 江苏先进无机材料研究院
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