High-strength carbon fiber enhanced boron nitride ceramic matrix composite and preparation method thereof

Abstract

The invention discloses high-strength carbon fiber enhanced boron nitride ceramic matrix composite and a preparation method thereof. The high-strength carbon fiber enhanced boron nitride ceramic matrix composite is characterized by being prepared from raw materials in parts by weight as follows: 60-70 parts of boron nitride, 5-8 parts of iridium trioxide, 5-8 parts of hafnium carbide, 8-12 parts of manganese powder, 10-14 parts of modified high-elastic carbon fiber, 0.03-0.05 parts of ammonium persulfate, 5-7 parts of acrylic acid, 0.3-0.5 parts of dimethylaminopropylamine, 10-12 parts of light calcium carbonate, 2-3 parts of chitosan, 20-30 parts of ethanol and 40-60 parts of deionized water. With modified high-strength carbon fiber as an enhancing phase, the high-strength carbon fiber enhanced boron nitride ceramic matrix composite has the advantages of excellent oxidation resistance, improvement of ceramic toughness and strength, high-temperature and low-temperature resistance, good thermal conductivity and small expansion coefficient; the surface of a blank body is coated with the added iridium trioxide and hafnium carbide, and accordingly, the sintering performance is improved.

Description

technical field [0001] The invention relates to a high-strength carbon fiber reinforced boron nitride ceramic-based composite material and a preparation method thereof, belonging to the technical field of ceramic production. Background technique [0002] Fiber-reinforced ceramic matrix composites are a young member of ceramic matrix composites. Fiber-reinforced ceramic matrix composites have the advantages of high temperature resistance, wear resistance, high temperature creep resistance, low thermal conductivity, low thermal expansion coefficient, and good chemical corrosion resistance. , is widely used in the working conditions where resin matrix, metal matrix and even some ceramic matrix composites cannot meet the performance requirements. It is one of the most active research fields in composite materials at present. High-elastic carbon fiber has the advantages of high strength, high elastic modulus, low density, high specific strength, ultra-high and low temperature re...

AI Technical Summary

Problems solved by technology

Although hexagonal boron nitride has such excellent properties and great application potential, it is a covalent bond compound with low self-diffusion coefficient at high temperature, so its sintering performance is poor.

At present, boron nitride ceramics are mainly prepared by hot-pressing sintering method promoted by sintering aids at home and abroad, but hot-pressing sintering equipment is complex, energy-consuming, and production efficiency is low, and large-scale production cannot be carried out. Parts with complex shapes

The addition of sintering aids will reduce some properties of boron nitride ceramics such as high temperature resistance, thermal conductivity, thermal shock resistance and dielectric properties, which is not conducive to its application at high temperatures