A method for preparing a boron and zirconium element-doped polycarbosilane ceramic precursor and a precursor filament

CN122167748APending Publication Date: 2026-06-09SUZHOU SAILIFEI CERAMIC FIBER CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SUZHOU SAILIFEI CERAMIC FIBER CO LTD
Filing Date
2024-12-09
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

The existing technology for preparing silicon carbide fibers is complex and costly, and the introduction of oxygen causes the fiber performance to degrade at high temperatures, making it difficult to meet the requirements of high-temperature application environments.

Method used

A method for preparing boron- and zirconium-doped polycarbosilane ceramic precursors and precursor fibers was developed. The doped polycarbosilane ceramic precursors were prepared by polycondensation reaction of a mixed pyrolysis solution with borate esters and zirconium acetylacetonate, followed by melt spinning. This method simplifies the process and improves the high-temperature stability of the fibers.

Benefits of technology

This method enables the preparation of high-performance silicon carbide fibers with low cost and simple process, improving the high-temperature stability and density of the fibers, and avoiding the performance degradation caused by the introduction of oxygen.

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Abstract

The present application uses the mixture of residual liquid and cracking product (LPS) after the cracking of polydimethylsilane (PDMS) as raw material, and the polymerization reaction with tributyl borate or triethyl borate obtains viscous liquid (LPCS), which introduces the heterogeneous element boron; the viscous liquid (LPCS) further reacts with zirconium acetylacetonate to introduce the heterogeneous element zirconium, and the polycarbosilane ceramic precursor (PBZCS) doped with boron and zirconium elements is obtained; the precursor silk obtained after the melt spinning can be inosculated by the relatively simple air oxidation crosslinking method, and the boron and zirconium elements act as sintering agents to densify the fiber in high-temperature sintering, and the high-temperature-resistant ceramic fiber is obtained.
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