Calcium zirconate fiber and preparation method thereof

Abstract

The invention relates to a calcium zirconate fiber and a preparation method thereof. The diameter of the calcium zirconate fiber is 0.5-2 mu m, and the calcium zirconate fiber belongs to the orthorhombic crystal system, is single-phase calcium zirconate and is free of the second phase. The preparation method comprises steps as follows: basic zirconium carbonate, glacial acetic acid, a calcium source and a solvent are proportionally and sufficiently stirred at 25-90 DEG C until a solution is clear, and a precursor solution is formed; a spinning aid is added to the precursor solution and is stirred and dissolved at 25-60 DEG C, the obtained precursor solution is regulated by the solvent to reach certain viscosity, and a precursor spinning solution is obtained; the precursor spinning solutionis subjected to electrostatic spinning, a precursor fiber is obtained and subjected to high-temperature heat treatment, and the calcium zirconate fiber is obtained. The preparation technology is simple, the cost is low, and molecular-level uniformity is realized in a preparation process. The fiber is uniform in diameter and reliable in quality, has excellent high-temperature stability and alkaliresistance, and has broad application prospect in the fields of a high-temperature thermal insulation material, a thermal barrier coating material, a chrome-free brick for a rotary cement kiln and ananti-corrosion crucible for titanium alloy melting.

Description

technical field [0001] The invention relates to the technical field of synthetic fibers, in particular to a calcium zirconate fiber and a preparation method thereof. Background technique [0002] Calcium zirconate (CaZrO 3 ) is CaO-ZrO 2 The compound with the highest and most stable CaO content in the system belongs to the perovskite compound. At 1750 ° C, it changes from an orthogonal structure to a cubic structure. It has a high melting point (higher than 2300 ° C), a small thermal expansion coefficient, and good thermal shock resistance. It is widely used as structural ceramics and refractory materials. Calcium zirconate has excellent alkali resistance and has been used to produce chromium-free cement kiln refractory bricks, see CN101759229A calcium zirconate and magnesium calcium zirconium bricks for cement kilns prepared by using calcium zirconate. Calcium zirconate has good chemical stability and is very suitable for casting high chemically active alloys such as tit...

AI Technical Summary

Problems solved by technology

[0003] There are many shortcomings in the traditional preparation method of calcium zirconate materials. For example, it is difficult to mix the raw materials evenly by the high-temperature solid-state reaction method, so it is difficult to obtain materials with uniform microstructure in the later process, and the mechanically ground mixture often needs to be processed at a higher temperature. High temperature, long reaction time, and it is easy to cause uneven grain growth; the melting method has the disadvantages of high energy consumption; the ball milling method has the disadvantages of low purity of the reaction product, incomplete reaction, and low yield.

[0004] At present, calcium zirconate materials are mostly in the form of materials such as powder, shell, ceramics, etc. The inventors of the present invention used the method of centrifugal spinning to prepare calcium zirconate fibers in the early stage, but the diameter of the fibers obtained by this method is relatively thick. Moreover, the preparation process of the precursor sol is relatively complicated.

Images