Preparation method of mullite whiskers

A mullite whisker and sol technology, which is applied in chemical instruments and methods, crystal growth, single crystal growth, etc., can solve the problems of high raw material cost, complex mullite whisker process, whisker morphology, and insufficient composition Uniformity and other issues, to achieve the effect of simple process

Inactive Publication Date: 2006-06-14
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of preparing mullite whiskers by the former process is complicated and the cost of raw materials is relatively high; while the latter process is difficult to achieve uniform mixing due to the use of alumina and silicon oxide powder raw materials, so the prepared whiskers have morphology, The composition is not uniform enough

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. Add industrial pure aluminum sol to deionized water while stirring, the weight ratio of aluminum sol to deionized water is 1:2, and heat to 90°C in a water bath;

[0023] 2. Add industrial pure silica sol to 2 times deionized water and stir;

[0024] 3. Press SiO2 2 : Al 2 o 3 =2:3 molar ratio Add the silica sol in step 2 dropwise to the alumina sol in step 1, and stir thoroughly for 1.5 hours.

[0025] 4. Dry the viscous mixed sol in step 3 at 70° C., pulverize, and pass through a 100-mesh sieve to obtain a mullite precursor xerogel powder.

[0026] 5. Mix mullite precursor xerogel with industrial pure aluminum fluoride in a ratio of 3:1, put it into a closed alumina crucible and calcinate at a temperature of 1400° C. to obtain mullite whisker powder. The diameter of the mullite whiskers is 0.3-1 μm, and the aspect ratio is 30-100. Yield 100%. After ball milling and sieving, the mullite whisker product with the required particle size can be obtained.

Embodiment 2

[0028] 1. Add industrial pure aluminum sol to deionized water while stirring, the weight ratio of aluminum sol to deionized water is 1:3, and heat the water bath to 90°C;

[0029] 2. Add industrial pure silica sol to 3 times deionized water and stir;

[0030] 3. Press SiO2 2 : Al 2 o 3 =2:3 molar ratio Add the silica sol in step 2 dropwise to the alumina sol in step 1, and stir thoroughly for 2 hours.

[0031] 4. Dry the viscous mixed sol in step 3 at 80° C., pulverize, and pass through a 180-mesh sieve to obtain a mullite precursor xerogel powder.

[0032] 5. Mix mullite precursor xerogel with industrially pure aluminum fluoride in a ratio of 4:1, put it into a closed alumina crucible and calcinate at a temperature of 1500° C. to obtain mullite whisker powder. The diameter of the mullite whiskers is 0.3-1 μm, and the aspect ratio is 30-100. Yield 100%. After ball milling and sieving, the mullite whisker product with the required particle size can be obtained.

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Abstract

The present invention relates to a preparation method of mullite whiskers, belonging to the field of new material technology. Its preparation method includes the following steps: using industrial pure aluminium sol and silicon sol as raw material, adopting sol-gel process to prepare mullite precursor body dried gel, then mixing the dried gel powder and industrial pure aluminium fluoride, high-temperature calcining in closed alumina ceramic crucible so as to obtain the invented mullite whiskers.

Description

(1) Technical field [0001] The invention relates to a method for preparing mullite whiskers used for toughening and reinforcing high-temperature structural ceramics, metals and plastics, and belongs to the technical field of new materials. (2) Background technology [0002] Mullite whisker has the properties of high temperature resistance, oxidation resistance, corrosion resistance, small thermal expansion coefficient, high temperature strength, etc. It is an excellent toughening and reinforcing agent for metals, ceramics and plastics, and can also be used in friction materials and other fields. [0003] There are many literature and patent reports about the preparation of mullite whiskers. Japan's Okada et al. used ethyl orthosilicate and aluminum nitrate as raw materials to prepare Al by sol-gel method. 2 o 3 -SiO 2 dry gel, and mix the dry gel with AlF 3 Mixed, and then calcined in a closed container to synthesize mullite whiskers, see Materials Science Communications...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/185C30B29/34C30B29/62
Inventor 张玉军谭砂砾谭训彦王洪彬张敏
Owner SHANDONG UNIV
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