High-toughness boron carbide ceramic composite material

Abstract

The invention discloses a high-toughness boron carbide ceramic composite material. The composite material is characterized by comprising the following substances in parts by weight: 37-71 parts of carbon black, 12-31 parts of silicon carbide, 5-19 parts of boron carbide, 3-11.5 parts of synthetic rubber, 1.8-9.5 parts of carboxymethylcellulose, 5.5-18 parts of paraffin, 1-5 parts of tetramethylammonium hydroxide, 3.5-13.2 parts of polyisobutene, 5-13 parts of polyacrylic ester, 15-22 parts of titanium dioxide, 1-16 parts of zirconium silicate and 11-30 parts of calcium phosphate. The composite material has the beneficial effects that the sintering temperature is lower and the preparation cost is substantially reduced; the obtained material has high density and quite high densification effects on whisker toughened ceramics are achieved via the result; the prepared material has high fracture toughness.

Description

technical field [0001] The invention relates to a high-toughness boron carbide ceramic composite material. Background technique [0002] B4C is widely used due to a series of excellent properties such as high hardness, high melting point, low density, high wear resistance, high neutron absorption, etc., but it also has two fatal weaknesses: one is difficult to sinter, due to boron carbide Boron and carbon in ceramics are combined with strong covalent bonds (the composition of covalent bonds is as high as 93.9%); second, the fracture toughness is low (KIC<2.2MPa m1 / 2), and the above two defects make boron carbide ceramics Applications are severely limited. [0003] At present, SiCw is the most used for toughening B4C ceramics. SiCw was added to B4C ceramics to prepare SiCw / B4C composites. During the fracture process of SiCw ceramics, debonding and pulling out of whiskers and deflection of cracks will occur, which consume energy and enhance the fracture toughness and str...

AI Technical Summary

Problems solved by technology

However, the density of sintered materials at normal pressure is low, and it is difficult to meet the required requirements; hot-press sintering and high-temperature isostatic sintering can produce high-density and high-performance ceramic materials, but the sintering temperature is high and requires high equipment requirements. difficult to control

[0004] The current B4C ceramic product preparation process has the problems of high sintering temperature (2000~2300°C) and high cost. High temperature sintering often leads to whisker damage, and the size of the product prepared by this process is limited, and can only be made into shapes. simple product