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Preparation method of mullite ceramic powder

A technology of ceramic powder and mullite, which is applied in the field of preparation of mullite ceramic powder, can solve the problems of environmental hazards of liquid waste, coarse synthetic crystal grains and high synthesis temperature, and achieves low cost, uniform distribution and repeatability. high effect

Inactive Publication Date: 2014-09-03
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, the current synthesis method of mullite has the advantages of high synthesis temperature, coarse synthetic crystal grains, complicated steps, and usually the synthetic product contains more impurities. In addition, since the mixing of raw materials is mostly carried out in liquid, so The liquid waste brought is also very harmful to the environment

Method used

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  • Preparation method of mullite ceramic powder
  • Preparation method of mullite ceramic powder

Examples

Experimental program
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Effect test

Embodiment 1

[0023] A preparation method of mullite ceramic powder, comprising the steps of:

[0024] (1) Take 5g of Al with a purity ≥ 99% and a particle size of 0.1 μm 2 o 3 The powder is passed through a 200-mesh sieve, placed in a vapor deposition reaction chamber, vacuumed to 5Pa, preheated to 500°C for coating, and 10g of tetraethyl orthosilicate (purity greater than 99%) is added to the raw material tank, heated to 90°C, turn on the rotary knob, adjust the selection rate to 15 rpm, open the valve of the raw material tank, and introduce argon gas, use the argon gas to introduce tetraethyl orthosilicate vapor into the reaction chamber, and then introduce oxygen into the reaction chamber, Wherein, the flow rate of argon is 35sccm, the flow rate of oxygen is 15sccm, adjust the pressure in the reaction chamber to 400Pa, coat for 120min, then stop the rotation, finish the coating, close the raw material supply valve, grind the coated powder, and 200-mesh sieve, then put it into a high-t...

Embodiment 2

[0026] A preparation method of mullite ceramic powder, comprising the steps of:

[0027] (1) Take 5g of Al with a purity ≥ 99% and a particle size of 1 μm 2 o 3 Powder, passed through a 200 mesh sieve, placed in a vapor deposition reaction chamber, vacuumed to 10Pa, preheated to 500°C to prepare for coating SiO 2 , add 12g of tetraethyl orthosilicate (purity greater than 99%) into the raw material tank, heat to 100 ° C, turn on the rotary knob, adjust the selection rate to 30 rpm, open the valve of the raw material tank, feed argon, use argon Introduce tetraethyl silicate vapor into the reaction chamber, and then introduce oxygen into the reaction chamber, wherein the flow rate of argon is 30 sccm, the flow rate of oxygen is 20 sccm, adjust the pressure in the reaction chamber to 600Pa, cover for 140min, and then stop Rotate, finish coating, close the raw material supply valve, grind the coated powder, pass through a 200-mesh sieve, then put it into a high-temperature furnac...

Embodiment 3

[0029] A preparation method of mullite ceramic powder, comprising the steps of:

[0030] (1) Take 5g of Al with a purity ≥ 99% and a particle size of 5 μm 2 o 3 Powder, passed through a 200 mesh sieve, placed in a vapor deposition reaction chamber, vacuumed to 10Pa, preheated to 500°C to prepare for coating SiO 2 , add 15g of tetraethyl orthosilicate (purity greater than 99%) to the raw material tank, heat to 110°C, turn on the rotary knob, adjust the selection rate to 45 rpm, open the valve of the raw material tank, feed argon gas, use argon Introduce tetraethyl silicate vapor into the reaction chamber, and then introduce oxygen into the reaction chamber, wherein, the flow rate of argon is 40 sccm, the flow rate of oxygen is 10 sccm, adjust the pressure in the reaction chamber to 800Pa, cover for 160min, and then stop Rotate, finish coating, close the raw material supply valve, grind the coated powder, pass through a 200-mesh sieve, then put it into a high-temperature furna...

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Abstract

The invention discloses a preparation method of mullite ceramic powder. The method comprises the following steps: wrapping a SiO2 nano layer composite microstructure on the surface of Al2O3 powder to prepare mullite powder, wherein the average grain size of initial powder Al2O3 powder is 0.1-10 microns; by taking TEOS with purity being over 99% as a raw material of SiO2, wrapping SiO2 on the surface of Al2O3 powder at 500-600 DEG C; and finally, sintering at 1250-1350 DEG C. The mullite powder prepared by the method provided by the invention has purity being over 97%, and has uniform grain size and the components. According to the user demand, the mullite powder with different grain sizes is produced and synthesized with low cost by selecting different Al2O3 powder. The method has the advantages of good repeatability and the like, and is simple to operate and easy to industrialize, and the prepared mullite powder structure is high in heat stability, low in cost, uniform in grain size distribution and suitable for commercial application on a large scale.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and in particular relates to a method for preparing mullite ceramic powder used as refractory materials, high-temperature engineering materials, electronic packaging materials and optical materials. Background technique [0002] Mullite ceramics are Al 2 o 3 -SiO 2 The only stable binary compound in the system, SiO 2 and Al 2 o 3 The molar ratio is 2:3. It has many advantages such as good thermal shock resistance, high refractoriness, and strong electrical insulation. It can be used as a refractory material in metallurgy, glass, ceramics and other industries. Since the content of natural mullite in the earth's crust is very rare, many countries use Al 2 o 3 and SiO 2 Mullite is synthesized as a raw material, and the specific synthesis methods include electric melting method, sintering method and solid-state reaction method. Jin Xihai and others have used sol-gel technology...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/185C04B35/626
Inventor 张建峰吴玉萍高文文洪晟郭文敏
Owner HOHAI UNIV
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