Method for synthesizing mullite whiskers by normal pressure sintering

A technology for synthesizing mullite and sintering under normal pressure, which is applied in chemical instruments and methods, single crystal growth, crystal growth, etc. Low purity and other problems, to achieve the effect of high aspect ratio and purity, high degree of dispersion, and uniform particle size distribution

Inactive Publication Date: 2011-01-05
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The mullite whiskers prepared by this method contain many impurities and low purity, so it is difficult to apply to strengthening and toughening metals and ceramic materials.

Method used

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  • Method for synthesizing mullite whiskers by normal pressure sintering
  • Method for synthesizing mullite whiskers by normal pressure sintering
  • Method for synthesizing mullite whiskers by normal pressure sintering

Examples

Experimental program
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Embodiment 1

[0025] Embodiment 1: raw material adopts industrial aluminum hydroxide 75.5%, silicon dioxide 24.5%, add the vanadium pentoxide of 2% aluminum fluoride of raw material quality and 4% of raw material quality, by raw material: alcohol: ball=2: Add 4:8 into a planetary ball mill and carry out wet ball milling for 8 hours to obtain a mixed powder with a particle size of 75-100um. The ball-milled powder is dried in an oven at 100°C for 4 hours, and the powder in the ball-milled powder is removed. Alcohol, to obtain a uniformly mixed powder; then add this powder to a polyvinyl alcohol solution with a concentration of 15% of 3% by weight of the raw material mass, mix it with a grinding rod for 25 minutes, and age it for 24 hours. Press the tablet machine into 10-15mm×5-10mm flakes, put them into a closed alumina ceramic crucible, and put them into a muffle furnace from room temperature to 800°C at a rate of 3°C / min, and keep warm for 2h Then, raise the temperature to 1250°C at a rate...

Embodiment 2

[0026] Embodiment 2: raw materials adopt industrial aluminum hydroxide 80.5%, silicon dioxide 19.5%, additives aluminum fluoride and vanadium pentoxide are respectively 6% and 2% of raw material quality, wet ball milling in planetary ball mill, obtain mixed Uniform powder, baked at 80°C for 6 hours, then added 4% by weight of polyvinyl alcohol solution with a concentration of 12% to the powder, mixed with a grinding rod for 40 minutes, put it into a closed container and aged for 18 hours, Press it into 10-15mm×5-10mm tablets with a powder tablet press, put them in a closed alumina ceramic crucible, and then put them in a muffle furnace from room temperature to 900°C at a heating rate of 4°C / min, keep warm After 1.5h, the temperature was raised to 1350°C at a rate of 8°C / min and held for 2.5h, and then the sample was cooled with the furnace to obtain the desired product. Scanning electron microscopy shows that the generated mullite whiskers are well dispersed, the whisker lengt...

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Abstract

The invention relates to a method for synthesizing mullite whiskers by normal pressure sintering. A second phase whisker material capable of enhancing and toughening a metal or ceramic matrix at the temperature of over 1,200 DEG C is prepared by using the high-temperature creep resistance of the mullite whiskers. The method for synthesizing the mullite whiskers by the normal pressure powder sintering has simple process; and the synthesized mullite whiskers have the advantages of high dispersion degree, uniform granule size distribution and high length-diameter ratio and purity, and can be used as enhancing and toughening whiskers for metal and ceramic materials.

Description

technical field [0001] The invention relates to a method for synthesizing mullite whiskers by normal-pressure sintering, which belongs to the field of material preparation. Background technique [0002] Mullite whiskers have outstanding advantages such as high temperature resistance, wear resistance, oxidation resistance, low thermal expansion coefficient, and excellent thermal shock resistance, and their excellent high temperature creep resistance makes them particularly suitable for use as metals and ceramics in high temperature environments. The material is reinforced and toughened using whiskers. [0003] There have been many literature and patent reports on the preparation of mullite whiskers. Al prepared from ethyl orthosilicate and aluminum nitrate by Japan Okada et al. 2 o 3 -SiO 2 Xerogel, same as AlF 3 Mullite whiskers were synthesized by calcining in a closed container (see Materials Science Communications. 8[9](1989): 1052-1054). The method adopts ethyl ort...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/20C30B29/62C30B1/10
Inventor 彭金辉刘永鹤孟彬郭胜惠张利波夏洪应曹威扬姚现昭
Owner KUNMING UNIV OF SCI & TECH
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