A kind of preparation method of mullite whisker ceramic material with high aspect ratio

A technology for mullite whiskers and ceramic materials, which is applied in the field of preparation of mullite whisker ceramic materials with high aspect ratio, can solve the problem that it is difficult to obtain equal mullite with high aspect ratio, and achieve dimensional stability, Effects of improved mechanical properties and improved heat resistance

Active Publication Date: 2020-04-28
JINGDEZHEN CERAMIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, mullite ceramic materials prepared by using these mineralizers to generate mullite whiskers in situ are difficult to obtain high aspect ratio and high purity mullite phase due to the existence of impurity phases.

Method used

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  • A kind of preparation method of mullite whisker ceramic material with high aspect ratio
  • A kind of preparation method of mullite whisker ceramic material with high aspect ratio

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment is a method for synthesizing ceramic materials with high aspect ratio mullite whiskers as the main crystal phase, and the steps are as follows:

[0026] (1) The mullite ceramic material contains the following components by weight: quartz glass powder 22%, Al 2 o 3 75%, Y 2 o 3 1.0%, metal tungsten powder 1.0%, amorphous silicon powder 1.0%, impurity K 2 O and Na 2 The sum of O contents is less than 0.5%.

[0027] (2) Quartz glass powder in the above raw materials requires SiO 2 Content greater than 98%, Al 2 o 3 Purity greater than 97%, Y 2 o 3 The purity of metal tungsten powder is greater than 99%, the Si content in amorphous silicon is not less than 98%, and all raw materials pass through a 200-mesh standard sieve.

[0028] (3) Preliminary ball milling is carried out with zirconia ball mills after weighing and mixing evenly according to the proportion. The mass ratio of the ball mills to the mixture is 2:1, the ball milling speed is 400 r / m...

Embodiment 2

[0035] This embodiment is a method for synthesizing ceramic materials with high aspect ratio mullite whiskers as the main crystal phase, and the steps are as follows:

[0036] (1) The mullite ceramic material contains the following components by weight: 25% of quartz glass powder, Al 2 o 3 73%, Y 2 o 3 0.7%, metal tungsten powder 0.5%, amorphous silicon powder 0.8%. K in impurities 2 O and Na 2 The sum of O contents is less than 0.5%.

[0037] (2) Quartz glass powder in the above raw materials requires SiO 2 Content greater than 98%, Al 2 o 3 Purity greater than 97%, Y 2 o 3 The purity of metal tungsten powder is greater than 99%, the Si content in amorphous silicon is not less than 98%, and all raw materials pass through a 200-mesh standard sieve.

[0038] (3) Preliminary ball milling is carried out with zirconia ball mills after being weighed and mixed evenly according to the proportion. The mass ratio of the ball mills to the mixture is 4:1, the ball milling speed...

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Abstract

The invention relates to a preparation method of a high length-diameter ratio mullite whisker ceramic material. The high length-diameter ratio mullite whisker ceramic material is characterized by comprising the following materials by weight percent: 20-26% of quartz glass powder, 72-78% of Al2O3, 0.5-2.0% of Y2O3, 0.5-2.0% of metal tungsten powder and 0.5-2.0% of amorphous silicon powder, and thehigh length-diameter ratio mullite whisker ceramic material is obtained through the steps of mixing the raw materials, primarily grinding, grinding again, screening, performing compression moulding, sintering, and naturally cooling. The preparation method overcomes the defects of the prior art, an additive having no toxic or side effects is properly added on the basis of the existing process and composition formula for the in-situ preparation of the mullite ceramic material, part of the raw materials is pretreated, the preparation process is optimized, and the ceramic material taking a high length-diameter ratio mullite whisker as a main crystalline phase is formed in situ. The shrinking percentage of the prepared ceramic material is within 5% relative to a green body, and the prepared ceramic material has relatively lower heat conductivity coefficient, relatively high porosity and relatively high mechanical strength.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a preparation method of a mullite whisker ceramic material with a high aspect ratio, which can be widely used in industrial fields such as thermal insulation and high-temperature filtration. Background technique [0002] Mullite ceramics is a very important aluminum silicate ceramic material, which is SiO 2 -Al 2 o 3 The only stable phase in the system, it has good high-temperature thermal stability, high-temperature strength, excellent oxidation resistance and low thermal expansion coefficient, and is widely used in industrial fields such as thermal insulation and high-temperature filtration. Mullite whiskers refer to mullite single crystals with a high aspect ratio. Due to the interweaving and growth of the whiskers, the ceramic material with mullite whiskers as the main crystal phase not only has a lower Density and greater porosity also have higher strength, which is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/185C04B35/81C04B35/622C04B38/00
CPCC04B35/185C04B35/622C04B38/00C04B2235/3225C04B2235/36C04B2235/404C04B2235/428C04B2235/5276C04B2235/6562C04B2235/6567C04B2235/96C04B2235/9607C04B35/803
Inventor 肖卓豪孔令兵李秀英董晓烽罗文艳
Owner JINGDEZHEN CERAMIC UNIV
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