Method for producing boron-nitrogen ceramic fibre fore-runner body

A ceramic fiber and precursor technology, applied in the field of boron-nitrogen ceramic fiber, can solve problems such as poor mechanical properties, fiber damage, and fiber difficulties, and achieve the effects of good mechanical properties, favorable fiber formation, and easy separation

Inactive Publication Date: 2008-05-07
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The polymers described above are suitable for the preparation of powders or some forms of coatings, but it is difficult to prepare more complex films, especially fibers, from these polymers
[0005] It is difficult for the precursor to form fibers mainly because its chemical structure is a cross-linked trackless network structure, and these structural defects will lead to fiber breakage and some weaknesses during subsequent processing, and lead to final mechanical properties. Relatively poor

Method used

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  • Method for producing boron-nitrogen ceramic fibre fore-runner body
  • Method for producing boron-nitrogen ceramic fibre fore-runner body
  • Method for producing boron-nitrogen ceramic fibre fore-runner body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Put the ammonium chloride in a vacuum oven and dry it at 110°C for 12 hours to remove the moisture in it. After cooling, crush it to below 200 mesh and put it into a U-shaped tube. Connect the device according to Figure 1 and let dry nitrogen into it. , Heat the U-shaped tube filled with ammonium chloride to 165°C to 175°C and keep it for 2 hours to remove the water vapor in the device. After 2 hours, boron trichloride gas was introduced, and white needle-like crystals appeared immediately in another U-shaped tube, which was cyclic trichloroborazane (TCB). Figure 2-1 is the infrared spectrum of cyclic trichloroborazine.

Embodiment 2

[0035] 7.7g of TCB (41.9mmol) was dissolved in anhydrous toluene and placed in a 250ml three-necked flask at -78°C, and an excessive amount of 35ml of anhydrous methylamine (338.7mmol) was slowly added dropwise to the flask with strong magnetic stirring Anhydrous toluene solution (the volume ratio of methylamine and toluene is 1:1), white flocculent methyl ammonium chloride precipitates immediately. After the methylamine was added dropwise, the reaction was stirred for 1 hour, the temperature was raised to -40° C. and stirred for 5 hours, then the temperature was raised to room temperature and stirred for 20 hours, then the stirring was stopped. At this time, there were many white flocculent precipitates in the solution, and the precipitates were removed by filtration in a glove box filled with nitrogen, and the precipitates were washed 3 times with 50 ml of anhydrous toluene solution. After the filtrate and the extract were mixed, part of the toluene was removed under high va...

Embodiment 3

[0037] 7.7g of TCB (41.9mmol) was dissolved in anhydrous toluene and placed in a 250ml three-necked flask at -78°C, and excessive 35ml of anhydrous dimethylamine (346.5mmol) was slowly added dropwise to the flask with strong magnetic stirring. ) in anhydrous toluene solution (the volume ratio of dimethylamine and toluene is 1:1), immediately there will be white flocculent dimethylammonium chloride precipitate. After the dimethylamine was added dropwise, the reaction was stirred for 1 hour, the temperature was raised to -40° C. and stirred for 5 hours, then the temperature was raised to room temperature and stirred for 20 hours, then the stirring was stopped. At this time, there were many white flocculent precipitates in the solution, and the precipitates were removed by filtration in a glove box filled with nitrogen, and the precipitates were washed 3 times with 50 ml of anhydrous toluene solution. After the filtrate and the extract were mixed, part of the toluene was removed ...

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Abstract

The invention relates to a preparation method of a boron nitrogen ceramic fiber precursor. The method synthesizes a trichloroborazine crystal through a high-temperature reaction of boron trichloride and ammonium chloride, and the product is mixed with an aliphatic compound containing an amino or imine group. The alkylamine is reacted at low temperature, then raised to room temperature for reaction, and then heated to 130°C to 250°C for reaction to obtain a precursor polymer. The precursor has good spinnability, and the pyrolysis product contains very little carbon element, which can make the final boron nitrogen fiber have good wave permeability.

Description

technical field [0001] The invention belongs to the field of boron-nitrogen ceramic fiber, in particular to a preparation method of a boron-nitrogen ceramic fiber precursor. Background technique [0002] Boron nitrogen ceramic is a high-performance non-oxygen ceramic material with high temperature resistance, corrosion resistance and good interface properties. It can be used as tools, abrasive tools, high temperature structural parts, wear-resistant and corrosion-resistant parts, seals and biological materials, etc. Widely used in machinery, electronic metallurgy, chemical industry, aerospace, military engineering and other fields. [0003] Boron-nitrogen ceramics Among them, boron-nitrogen ceramic fibers have excellent characteristics such as high temperature resistance (inert atmosphere 3000 ° C), chemical corrosion resistance, excellent dielectric properties, good electrical insulation, good thermal conductivity, and neutron absorption. [0004] There are two main method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/583
Inventor 余木火毕红艳李书同谢伟炜韩克清袁象恺
Owner DONGHUA UNIV
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