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Composite ceramic fiber and preparation method thereof

A technology of multiphase ceramics and fibers, applied in the chemical characteristics of fibers, textiles and papermaking, etc., can solve the problems of low mass fraction, high oxygen content, difficult to achieve uniform dispersion, etc., and achieve low melt spinning temperature and non-melting temperature. , The effect of improving high temperature creep resistance and broadening the scope of use

Active Publication Date: 2014-12-24
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the disadvantages of SiC fibers in the prior art that introduce metal elements such as titanium and zirconium with low mass fraction and high oxygen content, it is difficult to achieve uniform dispersion and form a multi-phase ceramic structure, so it is impossible to obtain ceramic fibers with higher oxidation resistance. The object of the present invention is to provide a kind of novel carbide and / or boride composite phase ceramic fiber and preparation method thereof

Method used

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  • Composite ceramic fiber and preparation method thereof
  • Composite ceramic fiber and preparation method thereof
  • Composite ceramic fiber and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Add polyzirconium carbosilane (containing Zr, Si, C, H) with a softening point of 70°C, a molecular weight of 1500, and a molecular weight distribution of 1.2 into the melt spinning tank, melt at 160°C, keep the temperature for 4 hours, and perform defoaming After treatment, the temperature was lowered to 120° C., and the pressure was increased to 0.5 MPa with nitrogen, and spinning was carried out on a spinning machine, and fibrils were obtained at a spinning speed of 2 m / s. The microscopic morphology of the prepared fibrils is as follows figure 1 As can be seen from the figure, the resulting fibrils have a smooth surface and a diameter of about 20 microns. 2 g of the fibrils obtained in Example 1 were aged in oxygen at 200°C for 20 minutes, then heated up to 1100°C at 0.5°C / min under an Ar atmosphere, kept for 1 hour, and then cooled to obtain 1.25 g of gray-black solid fibers.

[0035] The content of Zr element in the obtained fiber was measured by an inductively co...

Embodiment 2

[0037] The softening point is 75 ° C, the molecular weight is 2400, and the polyzirconium carbosilane-polyborazane (containing Zr, Si, C, B, H) composite precursor with a molecular weight distribution of 1.3 is added to the melt-spinning feed tank, at 180 Melting at ℃, constant temperature for 6h, defoaming treatment, then cooling to 110℃, using nitrogen to pressurize to 0.7MPa, spinning on a spinning machine, and obtaining fibrils at a spinning speed of 2.5m / s. The microscopic morphology of the prepared fibrils is as follows: Figure 4 As can be seen from the figure, the resulting fibrils have a smooth surface and a diameter of about 25 microns. 2 g of the obtained fibrils were aged in oxygen at 150°C for 40 min, then heated up to 1400°C at 1.5°C / min under an Ar atmosphere, kept for 1 h, and then cooled to obtain 1.30 g of gray-black solid fibers.

[0038] The content of Zr element in the fiber was measured by inductively coupled plasma atomic emission spectrometer, and the ...

Embodiment 3

[0040] Add polytitanium carbosilane (containing Ti, Si, C, H) with a softening point of 80°C, a molecular weight of 1850, and a molecular weight distribution of 1.2 into the melt spinning tank, melt at 140°C, keep the temperature for 8 hours, and perform defoaming After treatment, the temperature was lowered to 100° C., and the pressure was increased to 0.3 MPa with nitrogen, and spinning was carried out on a spinning machine. Fibrils were obtained at a spinning speed of 2.8 m / s, and the diameter of the obtained fibrils was about 18 microns. 2 g of the obtained fibrils were aged in oxygen at 110 °C for 60 min, then heated up to 1500 °C at 3 °C / min under an Ar atmosphere, kept for 1 h, and then cooled to obtain 0.92 g of gray-black solid fibers.

[0041] The content of Ti element in the obtained fiber was measured by an inductively coupled plasma atomic emission spectrometer, and the test result was 12.2%. XRD was used for detection, and the results showed that the obtained fib...

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Abstract

The invention relates to a composite ceramic fiber and a preparation method thereof. The composite ceramic fiber comprises the components of SiC (silicon carbide), MC and / or MB2, SiC which are evenly diffused and distributed, wherein M is one or more of Ti, Zr and Hf. The composite ceramic fiber uses a single or composite organic macromolecule precursor containing M, Si, C, H and a selectable B element as a raw material, a melt spinning technology is used, and the polybasic composite ceramic fiber is prepared from fiber stabilization and ceramic. The composite ceramic fiber disclosed by the invention has excellent mechanical and high-temperature-resistant antioxygenic properties, and can be used as a reinforcement body for preparing ceramic fiber reinforced composite materials.

Description

technical field [0001] The present invention generally relates to a ceramic fiber and a preparation method thereof, in particular to a carbide and / or boride composite ceramic fiber and a preparation method thereof. Background technique [0002] High-performance ceramic fibers combine the textile processing characteristics of fibers with the excellent properties of ceramics such as high strength, high modulus, high temperature resistance, corrosion resistance, oxidation resistance, and low density. They are widely used in the reinforcement of composite materials and for the preparation of metal composite materials such as ceramic matrix. ZrC ZrB 2 SiC multi-component multi-phase ultra-high temperature ceramics have better thermal stability and oxidation resistance than SiC at high temperatures, and the maximum service temperature exceeds 1600 ° C. It has broad application prospects in aerospace, national defense and civil fields. At present, high-temperature non-oxide ceram...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/10C04B35/565C04B35/58C04B35/622
Inventor 张伟刚戈敏田跃龙于守泉吕晓旭
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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