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Silicon carbide/boron nitride fiber co-doped with aluminum and zirconium and its preparation method

A boron nitride fiber, co-doping technology, applied in the chemical characteristics of fibers, textiles and papermaking, etc., can solve the problems of low thermal conductivity, poor thermal shock resistance, etc., to improve mechanical properties and high temperature resistance, heat resistance Strong impact, improve the effect of densification

Active Publication Date: 2021-07-30
JIANGXI JIAJIEXINDA NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to the shortcomings of the existing ultra-high temperature ceramics such as poor thermal shock resistance or low thermal conductivity, the design and preparation of fiber-reinforced ultra-high temperature ceramic matrix composites is an inevitable trend in the development of ultra-high temperature ceramics.

Method used

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Examples

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preparation example Construction

[0022] The invention provides a method for preparing silicon carbide / boron nitride fibers co-doped with aluminum and zirconium, which comprises the following steps.

[0023] S1: Preparation of silicon carbide / boron nitride precursors co-doped with aluminum and zirconium

[0024] Take aluminum acetate, zirconium acetylacetonate (Zr(AcAc) 3 ) and polyborosilazane were placed in the autoclave, and pure polydimethylsilane (PCS) was slowly injected into the autoclave, evenly covering the surface of the mixture of aluminum acetate, zirconium acetylacetonate and polyborosilazane, and then Rapidly heated to 180°C at a rate of 20°C / min and held for 2 hours to obtain crude material; among them, the purity of zirconium acetylacetonate and aluminum acetate was >99%; the purity of polyborosilazane was >99%, and the softening point was 70±5 °C, MW3536;

[0025] The crude material is dissolved in xylene, filtered, and distilled under reduced pressure to obtain the silicon carbide / boron nit...

Embodiment 1

[0033] This embodiment provides a method for preparing silicon carbide / boron nitride fibers co-doped with aluminum and zirconium, including the following steps.

[0034] S1: Preparation of silicon carbide / boron nitride precursors co-doped with aluminum and zirconium

[0035] Take aluminum acetate, zirconium acetylacetonate (Zr(AcAc) with a mass ratio of 1:100:15 3 ) and polyborosilazane were placed in the autoclave, and pure polydimethylsilane (PCS) was slowly injected into the autoclave, evenly covering the surface of the mixture of aluminum acetate, zirconium acetylacetonate and polyborosilazane, and then Heating at a rate of 20°C / min to 180°C and holding for 2 hours to obtain crude material; among them, the purity of zirconium acetylacetonate and aluminum acetate is >99%; the purity of polyborosilazane is >99%, and the softening point is 70±5°C , MW3536;

[0036] The crude material is dissolved in xylene, filtered, and distilled under reduced pressure to obtain the silico...

Embodiment 2

[0044] This embodiment provides a method for preparing silicon carbide / boron nitride fibers co-doped with aluminum and zirconium, including the following steps.

[0045] S1: Preparation of silicon carbide / boron nitride precursors co-doped with aluminum and zirconium

[0046] Take aluminum acetate, zirconium acetylacetonate (Zr(AcAc) with a mass ratio of 3:100:15 3 ) and polyborosilazane were placed in the autoclave, and pure polydimethylsilane (PCS) was slowly injected into the autoclave, evenly covering the surface of the mixture of aluminum acetate, zirconium acetylacetonate and polyborosilazane, and then Heating at a rate of 20°C / min to 180°C and holding for 2 hours to obtain crude material; among them, the purity of zirconium acetylacetonate and aluminum acetate is >99%; the purity of polyborosilazane is >99%, and the softening point is 70±5°C , MW3536;

[0047] The crude material is dissolved in xylene, filtered, and distilled under reduced pressure to obtain the silico...

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Abstract

The invention discloses a silicon carbide / boron nitride fiber co-doped with aluminum and zirconium and a preparation method thereof, comprising the steps of: mixing aluminum acetate, zirconium acetylacetonate and polyborosilazane, and then injecting polydimethylsilane And evenly cover the surface of the mixture, keep warm after heating, then dissolve in xylene, filter, and distill under reduced pressure to obtain fine materials; melt-spin the fine materials, and then sinter to obtain silicon carbide / zirconium co-doped with aluminum and zirconium Boron nitride fibers. The present invention introduces aluminum, zirconium, boron and nitrogen elements into the precursor, and reintroduces N element during the sintering process, especially silicon carbide / boron nitride fibers have silicon carbonitride nanometers at the interface, and the prepared silicon carbide / nitrogen The strength of boronized fiber at room temperature is 3.5±0.3GPa, and the elastic modulus is 280±20GPa; after being treated in an air environment at 1100°C for 100 hours, the strength retention rate can still reach more than 85%, which has a wide range of practical value and Application prospects.

Description

technical field [0001] The invention relates to the technical field of high-performance ceramic fibers, in particular to a silicon carbide / boron nitride fiber co-doped with aluminum and zirconium and a preparation method thereof. Background technique [0002] Silicon carbide (SiC) fiber is a kind of ceramic fiber with high strength and high modulus, oxidation resistance, wear resistance, corrosion resistance and small specific gravity. Various countries in the world have carried out extensive research on the preparation of continuous SiC fibers, which have extremely broad application prospects in high-tech fields such as aviation, machinery, chemical industry, aerospace, and weapons. At present, the strength of SiC fiber can reach 3.0±0.4GPa, the modulus can reach 200±20GPa, and the service temperature can reach 1000°C. Due to its low room temperature strength and insufficient toughness, its application is limited to a certain extent. In order to improve the strength and to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/10C04B35/5835C04B35/565C04B35/622
Inventor 吴宝林侯振华
Owner JIANGXI JIAJIEXINDA NEW MATERIAL TECH CO LTD
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