Zirconium-containing high-temperature silicon carbide fiber and preparation method thereof

Abstract

The invention relates to a zirconium-containing high-temperature silicon carbide fiber and a preparation method thereof. The preparation method comprises the following steps: S101, dissolving yttriumoxide into ethanol, heating, and uniformly stirring so as to obtain a first solution; S102, mixing and uniformly mixing the first solution with a nano-zirconia dispersion so as to obtain a second solution; S103, dissolving polycarbosilane into dimethylbenzene, adding a second solution, stirring, heating till a solvent is completely volatized so as to obtain a powder product; S104, performing melting spinning and non-melting treatment on the powder product so as to obtain a cross-linked fiber bundle; and S105, performing high-temperature sintering on the cross-linked fiber bundle in an inert atmosphere, and cooling to the room temperature, thereby obtaining the silicon carbide fiber. Zirconium oxide and yttrium oxide are introduced in the preparation process of the silicon carbide fiber preparation process, by virtue of the phase change size expansion of the zirconium oxide and the high-temperature flowability of the yttrium oxide, the silicon carbide fiber which is high in strength andstable in property at high temperatures is prepared, and the silicon carbide fiber has high application prospects in high-temperature fields such as aerospace.

Description

technical field [0001] The invention relates to the technical field of high-performance fibers, in particular to a zirconium-containing high-temperature resistant silicon carbide fiber and a preparation method thereof. Background technique [0002] Silicon carbide (SiC) fiber is a kind of ceramic fiber with high strength, high modulus and excellent high temperature resistance. Based on its excellent physical mechanics and high temperature resistance, silicon carbide fiber has extremely broad application prospects in cutting-edge defense fields such as aviation, aerospace, and weaponry; therefore, it has always been an embargoed item from Western countries to my country. Based on this, the study of silicon carbide fiber preparation technology, breaking the foreign technology blockade, and realizing the independent production of silicon carbide fiber will definitely improve the research and application level of my country's advanced composite materials and weaponry, and it is ...

AI Technical Summary

Problems solved by technology

However, the performance of SiC fiber is very sensitive to high temperature treatment temperature; it is generally believed that at high temperature, as the temperature increases, the β-SiC crystallite grain size in silicon carbide fiber grows, and obvious holes and microcrystals appear inside the fiber. Cracks, resulting in a sharp drop in fiber strength