Preparation method of low-cost mullite fiber

Abstract

The invention discloses a preparation method of low-cost mullite fibers. The preparation method comprises the following steps: firstly, preparing an aluminum carboxylate solution; preparing a silicon additive; and mixing the aluminum carboxylate solution with the silicon additive, reacting to obtain precursor sol, and performing concentration aging, spinning, heat treatment and the like to obtain the mullite fiber. Harmful gases such as chlorine, nitrogen dioxide and sulfur dioxide are not generated in the production process; the raw materials are low in requirement and easy to store, commercially available raw materials can be directly used, and the technical problem that the commercially available aluminum hydroxide raw materials cannot be used for preparing spinnable mullite fibers is solved. The preparation process is simple, green and environment-friendly.

Description

technical field [0001] The invention belongs to the field of preparation of inorganic nanometer materials, in particular to a preparation method of low-cost mullite fiber. Background technique [0002] Mullite ceramic fiber is an engineering material with excellent comprehensive performance. It can be used as a reinforcing component of ceramics, metals, plastics and other materials. It has the characteristics of high temperature resistance, corrosion resistance, high strength, good thermal shock resistance, and good thermal insulation performance. , plays an important role in the industrial and aerospace fields. [0003] Most of the existing technologies use the sol-gel method and the inorganic aluminum salt method to prepare mullite fibers, and the preparation of the precursor sol in the sol-gel method is the most critical process. In the prior art, although aluminum hydroxide is used as an aluminum source to prepare mullite fibers, the process is cumbersome and complicate...

AI Technical Summary

Problems solved by technology

In the prior art, although aluminum hydroxide is used as an aluminum source to prepare mullite fibers, the process is cumbersome and complicated, and the requirements for the activity of raw materials are extremely high, and the prepared mullite fibers often do not have spinnability.

In most of the processes for preparing spinnable mullite fibers, aluminum hydroxide and silica sol as the main raw materials must be produced and used now, which increases the process flow and preparation costs, and for the existing aluminum hydroxide and silica sol There are quality requirements, and the commercially available aluminum hydroxide will be placed for a long time from the preparation to the market, resulting in a decrease in activity. The silica-alumina sol prepared by using this aluminum hydroxide is not spinnable, so the same commercially available common Raw materials cannot produce satisfactory spinnable sols

[0004] The inorganic aluminum salt method mainly uses aluminum powder and aluminum salt to reflux at high temperature to produce aluminum sol, and then adds silica sol to produce mullite fiber, but dangerous hydrogen gas will be generated during the reaction process, and some aluminum salts containing Cl and N The by-products precipitated during the reaction will also greatly pollute the environment

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