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Preparation method of amorphous SiOC ceramic powder

A ceramic powder and amorphous technology, which is applied in the field of preparation of amorphous SiOC ceramic powder, can solve the problems of high-purity amorphous SiOC ceramic powder, low purity of amorphous SiOC ceramic powder, and difficulty in industrial application. Achieve the effect of controllable powder particle size distribution, solve the problem of high cost of raw materials, and easy control of structure and performance

Active Publication Date: 2015-01-21
常州宇超钢管有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the purity of the amorphous SiOC ceramic powder prepared by this method is low and contains a large amount of residual SiO 2 powder and undissolved C powder, and the yield is low
Therefore, it is not easy to realize industrial application by adopting the above method
[0004] At present, there are no relevant reports on the preparation of high-purity amorphous SiOC ceramic powders with different element contents and different particle size distributions.

Method used

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  • Preparation method of amorphous SiOC ceramic powder
  • Preparation method of amorphous SiOC ceramic powder
  • Preparation method of amorphous SiOC ceramic powder

Examples

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Embodiment 1

[0031] A preparation method of amorphous SiOC ceramic powder, comprising the following steps:

[0032] 1) Using 10.08wt% oxygen, the main chain is Si-CH 2 -Si, and Si and CH in the main chain at the same time 3 The linear polycarbosilane (LPCS) with the group connected to the H group is used as a precursor polymer, and the precursor is 2 Under the atmosphere, from room temperature, the temperature was raised to 190°C at a rate of 10°C / min, kept for 1 hour for cross-linking and curing, and then the cross-linked and cured product was crushed and passed through a 60-mesh sieve to obtain precursor particles;

[0033] 2) Put the precursor particles in the tube furnace, under N 2 Under the atmosphere, from room temperature to 900 °C at a rate of 2 °C / min, keep the temperature for 1 hour, and cool to room temperature with the furnace after the heat preservation is over, to obtain pyrolytic ceramic particles with a particle size of 60 μm-2 mm and irregular particle shape ;

[0034...

Embodiment 2

[0038] A preparation method of amorphous SiOC ceramic powder, comprising the following steps:

[0039] 1) Using 10.08wt% oxygen, the main chain is Si-CH 2 -Si, and Si and CH in the main chain at the same time 3 The linear polycarbosilane (LPCS) whose group is connected to the H group and the main chain is Si-O-Si, and Si in the main chain is simultaneously with CH 3 The group is connected to the H group, and the linear polysiloxane (LPSO) with an average relative molecular weight of 1700-3200 is used as a precursor polymer, and the mass ratio of polycarbosilane and polysiloxane is: 75:25 Mixing, magnetic stirring for 20min, the precursor in N 2 Under the atmosphere, from room temperature, the temperature was raised to 190°C at a rate of 10°C / min, kept for 1 hour for cross-linking and curing, and then the cross-linked and cured product was crushed and passed through a 60-mesh sieve to obtain precursor particles;

[0040] 2) Put the precursor particles in the tube furnace, un...

Embodiment 3

[0045] A preparation method of amorphous SiOC ceramic powder, comprising the following steps:

[0046] 1) Using 10.08wt% oxygen, the main chain is Si-CH 2 -Si, and Si and CH in the main chain at the same time 3 The linear polycarbosilane (LPCS) whose group is connected to the H group and the main chain is Si-O-Si, and Si in the main chain is simultaneously with CH 3 The group is connected to the H group, and the linear polysiloxane (LPSO) with an average relative molecular weight of 1700-3200 is used as a precursor polymer, and polycarbosilane and polysiloxane are mixed in a mass ratio of 60:40 , magnetic stirring for 20min, the precursor in N 2 Under the atmosphere, from room temperature, the temperature was raised to 190°C at a rate of 10°C / min, and kept for 1 hour for cross-linking and curing, and then the cross-linked and cured product was crushed and passed through a 40-mesh sieve to obtain precursor particles;

[0047] 2) Put the precursor particles in the tube furnac...

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Abstract

The invention discloses a preparation method of amorphous SiOC ceramic powder, which comprises the following steps: 1) carrying out low-temperature crosslinking curing on a precursor polymer, crushing the crosslinking curing product, and screening to obtain precursor particles, wherein the precursor polymer is linear polycarbosilane or a mixture of linear polycarbosilane and linear polysiloxane; 2) carrying out pyrolysis reaction on the precursor particles to obtain pyrolysis ceramic particles with irregular particle morphology, of which the particle size is 60 mu m-2mm; and 3) carrying out ball milling on the pyrolysis ceramic particles to obtain the amorphous SiOC ceramic powder. The amorphous SiOC ceramic powder has the characteristics of controllable Si, O and C element contents, controllable powder particle size and controllable crystallization temperature. The method has the advantages of simple preparation technique, low cost and the like, and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of new materials, and relates to a preparation method of ceramic powder, in particular to a preparation method of amorphous SiOC ceramic powder. Background technique [0002] Due to the excellent mechanical properties, oxidation resistance and high temperature creep resistance of amorphous SiOC ceramics, it is an excellent lightweight and high temperature resistant structural material. Composite materials based on it have received extensive attention and in-depth research. Aviation, aerospace, automobile, machinery, petrochemical and electronic industries have a wide range of applications. [0003] At present, there are two common methods for preparing amorphous SiOC ceramic powder: one is laser aerosol spray pyrolysis. For example, France uses small molecule silicon ether and small molecule silane to prepare amorphous SiOC ceramic powder with high purity and ultrafine particles (20nm-30nm) by laser aerosol...

Claims

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Application Information

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IPC IPC(8): C04B35/01C04B35/626
Inventor 王红洁马明波牛敏夏鸿雁史忠旗
Owner 常州宇超钢管有限公司
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