Preparation method of surface crease boron carbon nitride fiber

A technology of boron carbon nitrogen and fiber, applied in the field of preparation of boron carbon nitrogen fiber, to achieve good mechanical properties, improve mechanical properties, and facilitate industrial production

Active Publication Date: 2016-11-09
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] There is no literature report on the preparation of boron carbon nitrogen fibers with wrinkled surface

Method used

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  • Preparation method of surface crease boron carbon nitride fiber
  • Preparation method of surface crease boron carbon nitride fiber

Examples

Experimental program
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Effect test

Embodiment 1

[0026] (1) Put the polyacrylonitrile precursor in the reaction furnace, vacuumize the reaction furnace, replace the nitrogen with a purity of ≥99.9%, repeat 5 times, and then feed the mixed gas of boron trichloride and nitrogen (the volume of boron trichloride content of 50%), while raising the temperature of the system from room temperature to 230 ° C;

[0027] (2) Keep warm for 1 hour at a temperature of 230°C, and during the heat preservation process, alternately feed the mixed gas of boron trichloride and nitrogen, and the mixed gas of ammonia and nitrogen, that is, first feed boron trichloride The mixed gas of nitrogen and nitrogen (the volume content of boron trichloride is 50%), and then the mixed gas of ammonia and nitrogen (the volume content of ammonia gas is 50%), the alternating time is 15 minutes, and the alternating times are 2 times;

[0028] (3) Continue to feed the mixed gas of ammonia and nitrogen (the volume content of ammonia is 50%), and at the same time, ...

Embodiment 2

[0031] The difference between this example and Example 1 is that in step (2), the holding time at 230°C is 0.5 hours, the number of times of alternation is 1, and the obtained wrinkles have a wavelength of 0.85 microns and a height of 0.89 microns. The contact angle is 130°, and the tensile strength is 0.50GPa.

Embodiment 3

[0033] The difference between this example and Example 1 is that the holding time at 230°C is 3 hours, the number of alternations is 6 times, the wavelength of the wrinkles obtained is 1.86 microns, the height is 1.65 microns, the contact angle between the fiber and water is 142°, and the anti- The tensile strength is 0.55GPa.

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Abstract

A preparation method of surface crease boron carbon nitride fiber includes the following steps of firstly, putting polyacrylonitrile precursors in a reaction furnace, vacuumizing the reaction furnace and substituting nitrogen, introducing boron trichloride gas or mixed gas of boron trichloride gas and nitrogen, and raising the temperature; secondly, keeping the temperature, and alternately introducing the mixed gas of boron trichloride gas and nitrogen, and mixed gas of ammonia gas and nitrogen; thirdly, raising the temperature; fourthly, cooling the system to the room temperature to obtain the fiber. The fiber has a creased surface, has good mechanical performance, and forms a high contact angle together with water; due to the link structure of the fiber surface, the meshing between the fiber and a base body is enhanced, and the mechanical performance of a fiber enhanced composite can be greatly improved. In addition, the fiber with the surface of the structure has good application prospects on the aspects of controlling surface wettability, manufacturing microfluidic devices and the like.

Description

technical field [0001] The invention belongs to the field of fiber preparation, in particular to a method for preparing boron carbon nitrogen fiber with wrinkled surface. 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 carbonitrides have hexagonal and cubic structures similar to boron nitride and carbon, hexagonal boron carbonitride ( h -BCN) have properties between those of graphite and hexagonal boron nitride ( h -BN) is a semiconductor or a semi-metal, and by changing the atomic composition, its band gap and semiconductor properties 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), high temperature and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/622
CPCC04B35/58C04B35/62286C04B2235/46C04B2235/48C04B2235/96C04B2235/963C04B2235/9638
Inventor 楚增勇蒋振华谭银龙李公义胡天娇唐云李义和李效东
Owner NAT UNIV OF DEFENSE TECH
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