Method for preparing silicon carbide granulation powder for reflecting mirror

A manufacturing method and technology of silicon carbide powder, which are applied in the field of ceramic materials, can solve problems such as affecting the surface processing quality of mirrors, and achieve the effect of avoiding hollow spherical particles and improving processing quality.

Inactive Publication Date: 2017-03-08
北京钢研新冶精特科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

During the ceramic sintering process, the hollow spherical particles will produce porosity defects due to the aggregation of the binder, which will seriously affect the surface processing quality of the mirror

Method used

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  • Method for preparing silicon carbide granulation powder for reflecting mirror

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Embodiment 1

[0023] A method for preparing silicon carbide granulated powder for reflectors, comprising the following steps:

[0024] 1) Mixing: Add appropriate amount of silicon carbide ceramic grinding medium to the vertical stirring mill, the mass ratio of silicon carbide ceramic grinding medium to ceramic slurry is 2:1; add deionized water to silicon carbide powder according to the mass ratio of 1.6:1 Ionized water and silicon carbide powder; based on silicon carbide powder, add B 4 C, 5% mixture of B and C, 1% tetramethylammonium hydride, 0.1% n-octanol, start stirring after mixing. After stirring for 1 hour, add 6% diethylhexyl phthalate, continue stirring for 0.5 hour, then add 10% polyethylene glycol, and stir for another 1 hour to extract the slurry.

[0025] 2) Vacuum defoaming: put the uniformly stirred ceramic slurry in a vacuum defoaming machine, the vacuum degree is controlled at 20 Pa, keep it for 1 hour, and then take it out.

[0026] 3) Spray drying: adjust the inlet tem...

Embodiment 2

[0029] A method for preparing silicon carbide granulated powder for reflectors, comprising the following steps:

[0030] 1) Mixing: Add appropriate amount of silicon carbide ceramic grinding medium to the vertical stirring mill, the mass ratio of silicon carbide ceramic grinding medium to ceramic slurry is 2.5:1; add deionized water to silicon carbide powder according to the mass ratio of 1.8:1 Ionized water and silicon carbide powder; based on silicon carbide powder, add B 4 C, 6.8% mixture of B and C, 1.1% aminoethanol, 0.25% polyoxyethylene polyoxypropylene pentaerythritol ether, start stirring after mixing. After stirring for 1 hour, add dioctyl phthalate 12%, continue stirring for 0.5 hour, add polyvinyl butyral 13.5%, and stir for 1 hour, then take out the slurry.

[0031] 2) Vacuum defoaming: put the uniformly stirred ceramic slurry in a vacuum defoaming machine, the vacuum degree is controlled at 10 Pa, keep it for 2 hours, and then take it out.

[0032] 3) Spray dry...

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Abstract

The invention provides a method for preparing silicon carbide granulation powder for a reflecting mirror. The carbide granulation powder contains silicon carbide powder, an organic binder, a sintering aid and the like and is formed by binding a plurality of silicon carbide particles with the binder. The method comprises the steps as follows: the silicon carbide powder, the sintering aid, a dispersant, a plasticizer, the binder and a defoamer are added in sequence to deionized water as a solvent, and are stirred and then subjected to vacuum defoaming and spray drying after being stirred uniformly, and the silicon carbide granulation powder is obtained. The granulation powder with good sphericity and good fluidity can be prepared with the addition of the binder, the dispersant and the plasticizer in a proper proportion; hollow spherical particles are prevented from being prepared by the aid of the defoamer and a vacuum defoaming process, and the surface processing quality of the silicon carbide reflecting mirror is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, in particular to a method for preparing silicon carbide granulated powder for reflecting mirrors. Background technique [0002] Reflectors are an important part of large space telescopes, large ground telescopes, detection satellites, reconnaissance satellites, weather satellites, high-energy laser weapons, lidar systems and high-resolution space camera optical systems. Material requirements for mirror preparation: good thermal stability, high specific stiffness, diffraction-limited resolution of electromagnetic waves, low scattering rate, and a weight-reducing structure that can be processed. In addition to meeting the physical properties required by mirrors, silicon carbide materials can achieve diffraction-limited resolution in the visible light range after grinding, polishing, and coating. Therefore, silicon carbide is currently the preferred material for preparing mirrors. Pressur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/626
CPCC04B35/565C04B35/6261C04B35/62655C04B2235/5436
Inventor 贺志勇张启富王晓波千粉玲王峰
Owner 北京钢研新冶精特科技有限公司
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