Method for preparing boron nitride fiber cloth by precursor conversion process

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...

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