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Boron-carbon-nitrogen ceramic fiber and preparation method thereof

A technology of ceramic fiber and boron carbon nitrogen, which is applied in the field of ceramic fiber and its preparation, can solve the problems of limited adjustment range of chemical composition of products, and achieve the effects of easy industrial production, low cost and simple process

Inactive Publication Date: 2012-07-11
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The adjustment range of the chemical composition of the product is also limited by the preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The boron carbon nitrogen ceramic fiber of the present embodiment is continuous fiber, and chemical composition is B 1.0 C 3 N 1.1 .

[0019] Preparation:

[0020] (1) Apply a tension of 30 MPa to the polyacrylonitrile precursor, place it in a closed heating furnace, and feed a mixed gas of boron trichloride and nitrogen. In the mixed gas, the volume content of boron trichloride is 50%. Heat up to 100°C at a heating rate of ℃ / h, heat from 100°C to 300°C at a heating rate of 20°C / h, and heat-preserve for 5 hours; replace the remaining mixed gas with nitrogen, feed ammonia gas, and heat-insulate for 5 hours;

[0021] (2) Keep the tension in the above-mentioned closed heating furnace, replace the remaining ammonia with nitrogen, and feed the mixed gas of boron trichloride and nitrogen. In the mixed gas, the volume content of boron trichloride is 50%. The heating rate of °C / h is from 300 °C to 600 °C, and the heat preservation treatment is 5 hours; the remaining mixed ...

Embodiment 2

[0025] The continuous boron carbon nitrogen ceramic fiber of the present embodiment is a continuous fiber, and its chemical composition is B 1.5 C 3 N 1.5 .

[0026] The difference between the preparation method of the continuous boron-carbon-nitrogen ceramic fiber in this example and the preparation method in Example 1 is that in the mixed gas of boron trichloride and nitrogen used in the preparation, the volume content of boron trichloride is 100%.

[0027] The resistivity of the continuous boron carbon nitrogen ceramic fiber of the present embodiment is 1×10 3 Ω cm, the tensile strength is 1.6 GPa.

Embodiment 3

[0029] The boron carbon nitrogen ceramic fiber of the present embodiment is continuous fiber, and chemical composition is B 0.4 C 3 N 0.5 .

[0030] The difference between the preparation method of the continuous boron carbon nitrogen ceramic fiber of this example and the preparation method of Example 1 is that the volume content of boron trichloride is 5%.

[0031] The resistivity of the continuous boron carbon nitrogen ceramic fiber of the present embodiment is 4×10 -1 Ω·cm, the tensile strength is 1.8 GPa.

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Abstract

The invention relates to a boron-carbon-nitrogen ceramic fiber and a preparation method thereof. The boron-carbon-nitrogen ceramic fiber is of a continuous fiber, the chemical composition is of BxC3Ny, in the formula, x equals to 0.1-1.5, y equals to 0.1-1.5, the resistivity is 1.0 multiplied by 10<-2>-1.0 multiplied by10<3>omega.cm, and the tensile strength is 1.0-2.0GPa. The preparation method disclosed by the invention comprises the following steps of taking polyacrylonitrile precursors as raw materials, and performing circulating treatment with boron trichloride and ammonia so as to get the continuous boron-carbon-nitrogen ceramic fiber. The preparation method has the advantages of simple process, low cost and easy industrialized production; and the chemical composition and the resistivity of the boron-carbon-nitrogen ceramic fiber can be regulated, and the fiber can be applied to the field of functional composite materials with the functions of stealth, heat insulation and the like.

Description

technical field [0001] The invention relates to a ceramic fiber and a preparation method thereof, in particular to a boron carbon nitrogen ceramic fiber and a preparation method thereof. Background technique [0002] Boron carbon nitride materials have aroused great interest because of their special mechanical, thermal, electrical and optical properties and potential applications. Ternary boron carbonitride has a hexagonal and cubic structure similar to boron nitride and carbon. The properties of hexagonal boron carbonitride (h-BCN) are between graphite and hexagonal boron nitride (h-BN). It is a semiconductor Or semimetal, and by changing the atomic composition, its forbidden band width and semiconductor performance are tunable. [0003] The synthesis methods of boron carbon nitrogen compounds reported in the literature can be mainly summarized as solid-phase nitriding method, solid-phase pyrolysis method, chemical vapor deposition (CVD), physical vapor deposition (PVD), h...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/622
Inventor 楚增勇闫佳邢欣程海峰周永江
Owner NAT UNIV OF DEFENSE TECH
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