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Introduction to boron-based superhard materials
The main disadvantages of carbon-based superhard materials represented by diamond are poor thermal and chemical stability, which greatly limits their application. Boron-based binary or ternary systems can compensate for this shortcoming of carbon-based superhard materials. 1. Cubic Boron Nitride Cubic Boron Nitride is a compound material with low density, superhardness, wide band gap, high thermal conductivity, high electrical resistivity, high thermal stability and chemical stability. It has the same crystal structure as diamond and its physical properties are very similar to diamond. Compared with diamond, its remarkable advantages are good thermal stability and chemical stability. It can be used for super-hard tool coatings, especially for tool coatings for processing iron-based alloys. Moreover, it can be doped into n-type and p-type semiconductors, and the type doping of diamond is very difficult. Due to these unique comprehensive properties, it has unpredictable development prospects in many fields such as machining, electronics and optics. 2, boron carbide in the known substances, has a diamond structure B 4 C hardness is second only to diamond and c-BN, especially its high temperature hardness is very prominent, while B 4 C also has high elastic modulus, low density, Acid and alkali resistance and high neutron absorption capacity are promising to replace expensive diamonds in certain areas. Industrially, a B 4 C powder is generally prepared by subjecting boric acid or dehydrated boron oxide to carbon in an electric furnace for high-temperature reduction reaction, and in addition, it can be produced by a metal thermal reduction method. Although its hardness ranks third among known substances, its shortcomings affect its reliability and severely restrict its wide application in industry. Including low fracture toughness, excessive sintering temperature, poor oxidation resistance, and poor stability to metals. Recent studies have shown that the use of composites with other materials can improve their mechanical properties. 3. Nitrogen Carbide In addition to diamond and CN, BC, and BN binary systems, BCN-containing ternary compounds are also considered to be potential superhard materials. As early as the year, some people based on quantum chemistry, based on the similarity of electronic structures, predicted the possibility of the emergence of ternary compound superhard materials. Later, people began to try to synthesize diamond-like BCN. The diamond-like structure of c-BCN materials is attracting the attention of the international material community. Due to its advantages of two superhard materials, diamond and cubic boron nitride, it will become an ideal new superhard material.