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Aluminum-zirconium co-doped silicon carbide/boron nitride fiber and preparation method thereof

A boron nitride fiber and co-doping technology, which is applied in the fields of fiber chemical characteristics, textiles and papermaking, etc., can solve the problems of poor thermal shock resistance and low thermal conductivity, achieve strong thermal shock resistance, improve mechanical properties and High temperature resistance, effect of inhibiting grain growth

Active Publication Date: 2019-05-31
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

Experimental program
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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 includes the following steps.

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

[0024] Take aluminum acetate and zirconium acetylacetonate (Zr(AcAc) with a mass ratio of (1~4.5)): 100:15 3 ) And polyborosilazane are placed in the autoclave, and pure polydimethylsilane (PCS) is slowly injected into the autoclave, evenly covering the surface of the mixture of aluminum acetate, zirconium acetylacetonate and polyborosilazane, and then Rapid heating to 180°C at a rate of 20°C / min and holding for 2h to obtain a 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 ℃, MW3536;

[0025] The coarse material is dissolved in xylene, filtered, and distilled under reduced pressure to obtain a si...

Embodiment 1

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

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

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

[0036] The coarse material is dissolved in xylene, filtered, and distilled under reduced pressure to obtain a silicon carbide / boro...

Embodiment 2

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

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

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

[0047] The coarse material is dissolved in xylene, filtered, and distilled under reduced pressure to obtain a silicon carbide / boro...

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Abstract

The invention discloses aluminum-zirconium co-doped silicon carbide / boron nitride fiber and a preparation method thereof. The method includes the following steps that aluminum acetate, zirconium acetoacetate and polyborosilicazane are mixed, polydimethylsilane is injected to uniformly cover the surface of a mixture, heat preservation is conducted after heating, and after dissolving with xylene, filtering, and vacuum distillation, fine materials are obtained; the fine materials are subjected to melt spinning, sintering is conducted, and the aluminum-zirconium co-doped silicon carbide / boron nitride fiber is obtained. Aluminum, zirconium, boron and nitrogen elements are introduced into a precursor, N elements are re-introduced in the sintering process, especially the interface of the siliconcarbide / boron nitride fiber contains nanon silicon carbide nitride, the strength of the prepared aluminum-zirconium co-doped silicon carbide / boron nitride fiber is 3.5+ / -0.3 GPa at room temperature, and the elastic modulus is 280+20 GPa. After treatment in an air environment of 1100 DEG C for 100 hours, the strength retention rate of the fiber still reaches 85% or above, and the fiber has practical value and a wide application prospect in the field of high-performance fiber.

Description

Technical field [0001] The invention relates to the technical field of high-performance ceramic fibers, and in particular to an aluminum-zirconium co-doped silicon carbide / boron nitride fiber and a preparation method thereof. Background technique [0002] Silicon carbide (SiC) fiber is a ceramic fiber with high strength, high modulus, anti-oxidation, wear resistance, corrosion resistance, small specific gravity and other excellent properties. Countries around the world have conducted extensive research on the preparation of continuous SiC fibers, which have extremely broad application prospects in high-end 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℃. Due to its low room temperature strength and insufficient toughness, its application is subject to certain limitations. In order to improve the strength and ...

Claims

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Application Information

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Patent Type & Authority Applications(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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