Technology for preparing cordierite-based continuous fiber by using sol-gel method

Abstract

The invention discloses a technology for preparing cordierite-based continuous fiber by using a sol-gel method. According to the invention, aluminum nitrate, a magnesium-containing compound, organic acid and an inorganic additive are added to water, such that a mixed solution is formed; the mixed solution is subject to a reaction with continuous stirring under a certain temperature, such that an aluminum-magnesium gel is obtained; a certain amount of a solvent is added to the aluminum-magnesium gel, and a certain amount of a silicon-containing additive and a high-polymer spin finish aid are added to the mixture, such that a cordierite-based fiber precursor solution is obtained; the solution is condensed, such that a spinnable cordierite-based fiber precursor sol is obtained; a dry spinning method or a wet spinning method is adopted, and cordierite-based continuous fiber protofilaments containing organics are obtained; and the protofilaments are dried and sintered, such that cordierite-based continuous fiber is obtained. The cordierite-based continuous fiber can be used as reinforcement in a composite material for improving the strength and the toughness of the material, and for improving the thermal resistance of the material. The cordierite-based continuous fiber can be widely applied in fields of aeronautics and astronautics, automobiles, and industrial kilns.

Description

technical field [0001] The invention relates to a preparation process of cordierite-based continuous fibers that can be used as winding, lamination or other two-dimensional and three-dimensional weaving. Background technique [0002] The chemical formula of cordierite is 2MgO 2Al 2 o 3 ·5SiO2 2 , Theoretical chemical composition: MgO is 13.7%, Al 2 o 3 34.9%, SiO 2 It is 51.4%; its melting point is 1460°C. Synthetic cordierite is usually hexagonal, the space group is P6Pmcc, and the unit cell parameters are: a=9.800, c=9.345. In the cordierite structure, composed of 5 [SiO 4 ] tetrahedron and 1 [AlO 4 ] tetrahedra form a six-membered ring; the six-membered rings are arranged coaxially along the c-axis, and the adjacent two layers are staggered at an angle of 30°; the six-membered rings are surrounded by [AlO 4 ] tetrahedron and [MgO 6 ] octahedral connections; [AlO 4 ] tetrahedron and [MgO 6 ] The octahedrons share edges to form a stable cordierite structure [<...

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Problems solved by technology

However, the common disadvantage of these two methods is that the melting temperature or sintering temperature is relatively high.

[0008] The sol-gel spinning process has the advantages of small mixing scale, uniform mixing, and low firing temperature, but there is no relevant literature report on the process of preparing continuous cordierite fibers by sol-gel method

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