Method for preparing high-compactness hafnium diboride ceramics

Abstract

The invention discloses a method for preparing high-compactness hafnium diboride ceramics. According to the method, hafnium diboride powder is subjected to high-energy ball milling, acid washing, vacuum treatment and encapsulation and pre-pressing with high-melting point covering materials, and is then directly sintered into the high-compactness hafnium diboride ceramics under the conditions of 3to 15 GPa and 600 to 2000 DEG C. A high-temperature and high-pressure method is used for preparing a pure phase hafnium diboride block material having a good crystal form and a microstructure for thefirst time; the characteristics of small crystal particle dimension, high crystallinity degree, high compactness degree and stable structure are realized; high hardness and excellent fracturing toughness are realized. The preparation process is simple; the high melting point, high intensity, high hardness, high toughness and high anti-oxidization performance are realized; the material is developedto become the novel high-temperature structure ceramic material, and can be used as a candidate material of an airplane engine high-temperature-resistant component, can also be developed into novel hard alloy, can replace tungsten carbide hard alloy cutters, and can also be applied to the field of mechanical cutting.

Description

technical field [0001] The invention relates to a high-density hafnium diboride ceramic, which belongs to the field of high-temperature structural ceramics and hard alloys thereof, in particular to a method for preparing high-density hafnium diboride ceramics. Background technique [0002] Ultrahigh-Temperature Ceramics (UHTCs for short) is a class of materials that can maintain chemical stability in high-temperature environments (above 2000 ° C) and reaction atmospheres (such as atomic oxygen environments), usually including borides, carbides, High melting point transition metal compounds including oxides. Among these high melting point transition metal compounds, HfB 2 The melting points of , HfC, TaC, etc. exceed 3000°C, which makes them have great application potential under extreme conditions. The high electron concentration of transition metals makes them have a large bulk modulus and the ability to resist elastic deformation, but because the formation of metal bonds...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing high-density hafnium diboride ceramics, so as to solve the problems that the traditional hafnium diboride ceramics are difficult to be densified, and the pure phase is difficult to prepare into blocks.

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