Reaction sintering lightweight silicon carbide mirror blank and preparation method thereof

Abstract

The invention relates to a reaction sintered lightweight silicon carbide reflective mirror blank and a preparation method thereof, belonging to the field of optical materials. The invention adopts the method of porous carburizing silicon carbide to prepare reaction sintered silicon carbide material, and further prepares light-weight silicon carbide mirror blank. The present invention is characterized in that furfuryl alcohol and / or furfuryl alcohol resin is used as carbon source, alcohols such as diethylene glycol are used as solvent and pore-forming agent, p-toluenesulfonic acid or sodium p-toluenesulfonate is used as catalyst, and polymerization phase separation technology is adopted The green body of pure porous carbon with controllable pore size was prepared, and the reaction sintered silicon carbide was prepared by liquid phase or vapor siliconizing. The silicon carbide mirror blank provided by the present invention does not contain the original added coarse silicon carbide particles in the blank, and all the silicon carbide in the product is formed in the reaction process, so the prepared silicon carbide material is different from the traditional reaction sintered silicon carbide Compared with the material, the material has the advantages of uniform microstructure, fine crystal grains, low silicon content, excellent performance, etc.; at the same time, the preparation method of the mirror blank provided by the invention is simple in process and easy to implement, and the prepared mirror blank has high reliability and stable quality.

Description

Reaction sintering lightweight silicon carbide mirror blank and preparation method thereof technical field The invention relates to a reaction sintered lightweight silicon carbide reflective mirror blank and a preparation method thereof, belonging to the field of optical materials. Background technique Lightweight space mirrors are the core components of space remote sensing optical systems. Initially, fused silica and glass-ceramics were mainly used as mirror materials. With the gradual improvement of the resolution of the space remote sensing optical system, the diameter of the reflector also increases, the overall quality of the optical system continues to increase, and the requirements for the temperature control system are also getting higher and higher. In this case, materials such as Be and SiC with excellent properties such as low density, low thermal expansion coefficient, high specific stiffness, and high thermal conductivity have become the main candidates for l...

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Problems solved by technology

Up to now, there are no relevant patents and literature reports on the preparation of lightweight silicon carbide mirror blank products using reaction sintered silicon carbide materials prepared by porous carburizing silicon carbide

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