Boron carbide/silicon carbide ceramic entire board and preparation method and application thereof

Abstract

The invention discloses a boron carbide / silicon carbide ceramic entire board and a preparation method and application thereof. The method comprises the following steps: (1) mixing boron carbide powder, silicon carbide powder, carbon powder, a binder, a dispersant and water, and then, carrying out ball-milling and slurrying, so as to prepare slurry; (2) enabling the slurry prepared in the step (1) to be subjected to drying and granulating by adopting spray granulation and drying processes, so as to obtain granules; (3) carrying out compacting molding on the granules prepared in the step (2) by adopting a cold isostatic compacting process, so as to obtain a biscuit; (4) carrying out pressure-less sintering on the biscuit prepared in the step (3), and carrying out cooling, thereby obtaining the ceramic entire board. According to the boron carbide / silicon carbide ceramic entire board and the preparation method and application thereof, the boron carbide / silicon carbide biscuit, of which the density of all points are uniform, is obtained by adopting a cold isostatic compacting method and determining the pressure holding pressure and pressure holding time of each stage through repeated trials, and the biscuit is uniformly contracted proportionally during sintering, so that the original camber of the biscuit is completely reserved, and a pressure-less sintering process can be applied to the preparation of large-area and complicated-shape boron carbide / silicon carbide workpieces.

Description

technical field

[0001] The invention relates to a boron carbide / silicon carbide ceramic whole board, a preparation method and application thereof. Background technique

[0002] Silicon carbide ceramic materials have excellent characteristics such as high temperature strength, high temperature oxidation resistance, good wear resistance, good thermal stability, small thermal expansion coefficient, high thermal conductivity, high hardness, thermal shock resistance and chemical corrosion resistance. It has become an irreplaceable structural ceramic with excellent performance in many industrial fields. Silicon carbide ceramics have high performance and are widely used in the industrial field, but silicon carbide is a covalently bonded compound with strong covalent properties. The sintering of silicon carbide has always been a research hotspot in the material industry. How to adopt a simpler production process The preparation of high-density silicon carbide ceramic products has b...

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