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Method for preparing boron nitride fiber cloth by precursor conversion process

A boron nitride fiber and precursor technology, which is applied in the field of ceramic materials, can solve the problems of insufficient strength of boron nitride fiber and the inability to directly weave cloth, etc., and achieve the effects of easy large-scale production, strong adsorption capacity, and excellent electrical properties

Active Publication Date: 2017-05-03
SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing boron nitride fiber cloth by using a precursor conversion process. The process is simple, and it is easy to realize large-scale production. The preparation of microwave materials, heat-resistant materials and battery separators provides basic raw materials with excellent performance

Method used

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  • Method for preparing boron nitride fiber cloth by precursor conversion process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Melt 5kg of boric acid in a chemical crucible at 800°C for 5 hours until the melt is transparent, clear and free of bubbles. A 200-hole platinum wire drawing bushing was used for wire drawing. The bushing temperature was 600°C and the speed of the drawing head was 3500 rpm to obtain boron oxide fiber yarns with 200 fibers and a diameter of 8.2 μm. The obtained 2 bundles of 200 boron oxide fiber yarns were plied by plying and twisting equipment to obtain 400 boron oxide fiber rovings.

[0028] The boron oxide fiber roving is woven with a weaving equipment, and the woven sample is kept at 600°C for 2 hours in an ammonia atmosphere, and the ammonia flow rate is 1m 3 / h, and the heating rate is 30°C / min, to obtain a low-temperature nitrided boron nitride fiber cloth. The above fiber cloth was heat-treated at a high temperature of 1400°C for 60 minutes in a vacuum carbon tube furnace with a heating rate of 8°C / h to obtain a boron nitride fiber cloth.

[0029] The prepared ...

Embodiment 2

[0031] Melt 5kg of boric acid in a chemical crucible at 800°C for 5 hours until the melt is transparent, clear and free of bubbles. A 200-hole platinum wire-drawing bushing was used for wire drawing. The bushing temperature was 700°C and the speed of the drawing head was 4000 rpm to obtain boron oxide fiber yarns with 200 fibers and a diameter of 8.3 μm. The obtained 5 bundles of 200 boron oxide fiber yarns were plied by plying and twisting equipment to obtain 1000 boron oxide fiber rovings.

[0032] The boron oxide fiber roving is woven by weaving equipment, and the woven sample is kept at 750°C for 4 hours in an ammonia atmosphere, and the ammonia flow rate is 3m 3 / h, and the heating rate is 40°C / min, to obtain a low-temperature nitrided boron nitride fiber cloth. The above fiber cloth was heat-treated at a high temperature of 1450° C. for 80 minutes in a vacuum carbon tube furnace with a heating rate of 10° C. / h to obtain a boron nitride fiber cloth.

[0033] The prepare...

Embodiment 3

[0035] Melt 5kg of boric acid in a chemical crucible at 900°C for 10 hours until the melt is transparent, clear and free of bubbles. A 200-hole platinum wire drawing bushing was used for wire drawing. The bushing temperature was 700°C and the speed of the drawing head was 3800 rpm to obtain 200 boron oxide fiber yarns with a diameter of 7 μm. The obtained 5 bundles of 200 boron oxide fiber yarns were plied by plying and twisting equipment to obtain 1000 boron oxide fiber rovings.

[0036] The boron oxide fiber roving is woven by weaving equipment, and the woven sample is kept at 700°C for 3 hours in an ammonia atmosphere, and the ammonia flow rate is 4m 3 / h, and the heating rate is 45°C / min, to obtain a low-temperature nitrided boron nitride fiber cloth. The above fiber cloth was heat-treated at 1480°C in a nitrogen atmosphere in a vacuum carbon tube furnace for 60 minutes at a high temperature with a heating rate of 10°C / h to obtain a boron nitride fiber cloth.

[0037] Th...

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Abstract

The invention specifically relates to a method for preparing boron nitride fiber cloth by using precursor conversion, which belongs to the technical field of ceramic materials. The method comprises the following steps: (1) subjecting boric acid to fusing and wire drawing so as to obtain single-bunch boric oxide fiber yarns; (2) stranding and cabling 2 to 10 boric oxide fiber yarns into a thick single-bunch boric oxide fiber yarn and braiding the thick single-bunch boric oxide fiber yarn to obtain boric oxide fiber cloth; (3) subjecting the boric oxide fiber cloth to low-temperature nitridation heat treatment in an ammonia gas atmosphere so as to obtain boric oxide fiber cloth; and (4) carrying out high-temperature heat treatment on the boric oxide fiber cloth. The method provided by the invention is simple, can easily realize large-scale production, overcomes the problem of incapable direct weaving due to insufficient strength of boron nitride fiber, and provides a basic raw material with excellent performance for preparation of high-temperature wave-transmitting materials, heatproof materials and battery diaphragms.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and in particular relates to a method for preparing boron nitride fiber cloth by using a precursor conversion process. Background technique [0002] Boron nitride ceramic fiber has excellent characteristics such as high temperature resistance (inert atmosphere 3000°C), chemical corrosion resistance, excellent dielectric properties, good electrical insulation, and good thermal conductivity. The research on domestic boron nitride ceramic fiber has a history of nearly 40 years. Boron nitride ceramic fiber has experienced fixed-length boron nitride fiber, continuous boron nitride fiber, boron nitride fiber composite material, boron nitride fiber paper, etc. product type. The application field of boron nitride fiber is also expanding continuously. Using the excellent properties of boron nitride fiber, various composite materials and products can be used in aviation, aerospace, electric powe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/583C04B35/622
Inventor 唐杰张铭霞王重海李传山李伶唐建新齐学礼林雪李茹黄健张一驰
Owner SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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