Preparation method of narrow molecular weight carbide fiber containing zircon

Abstract

The invention relates to a preparation method of narrow molecular-weight silicon carbide fiber containing zeolite. The method comprises the following steps: dissolving liquid polyhydrogen carbosilaneinto a propanol and xylene mixed solution, then performing distillation, and collecting pure distillate polyhydrogen carbosilane; respectively performing ball milling the polyhydrogen carbosilane andzeolite, so as to respectively obtain nanometer particles; mixing the two nanometer particles and methanol, and heating and stirring, so as to obtain a mixed solution; performing air distillation on the mixed solution, collecting mixed powder, and performing non-melting treatment and then high temperature sintering, so as to obtain silicon carbide fiber. The method has the advantages that zeoliteis added during the preparation of the silicon carbide fiber, water molecule of zeolite can freely move and get in and out of channels, and can be freely desorbed under the trend of heating power anddoes not affect a skeleton structure; water molecule becomes water vapor and is separated out from cracks and takes away part of heat, and meanwhile, the vacancy of the water molecule increases the heating area of a material, the problem that excess temperature inside a fiber pile during a non-melting process can be solved, and melting and combination of the fiber are reduced.

Description

technical field [0001] The invention relates to the technical field of silicon carbide fiber preparation, in particular to a preparation method of zeolite-containing narrow molecular weight silicon carbide fiber. Background technique [0002] Silicon carbide fiber is a new type of high-tech ceramic fiber, which has the advantages of high specific strength, large specific modulus, small linear expansion coefficient, and good high temperature resistance. And it has good compatibility with metals, ceramics and polymers, and has extremely broad application prospects in aerospace, weapon shipbuilding and other fields. In the existing preparation, the purpose of the non-melting treatment of the polyhydrocarbosilane fiber is to change it from a thermoplastic material to a thermosetting material. During the non-melting preparation process, the accumulation of fibers causes the temperature in the stack to be too high, and the heat cannot be dissipated in time. If the local temperatu...

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Problems solved by technology

[0003] In view of the defects in the prior art, the purpose of the present invention is to provide a method for preparing zeolite-containing narrow-molecular-weight silicon carbide fibers. By adding zeolite during the preparation process of silicon carbide fibers, the water molecules of the zeolite can move freely and enter and exit the pores. , under the tendency of heat, it can be desorbed freely without affecting its skeleton structure; a small amount of cracks are generated on the surface of silicon carbide fibers during the molding process, and water molecules become water vapor to precipitate from the cracks and take away part of the heat , at the same time, the vacancies of water molecules increase the heating area of ​​the material, which can solve the problem of excessive internal temperature of the fiber stack during the non-melting process, reduce the fusion of fibers, and produce silicon carbide fibers with narrow molecular weight distribution