Others

With the rapid development of modern science and technology, the demand for materials with different properties is increasing. Among them, superhard materials have received great attention because of their extremely high hardness. They have become indispensable tools in geological drilling, mechanical processing, stone processing, aerospace and national defense. Although superhard materials have been widely used in all walks of life, there is still no strict regulation on the category of superhard materials. It is customary to refer to materials whose hardness is close to that of diamond as superhard materials. Based on this, in addition to the commonly diamond and cubic boron nitride (CBN), there are many materials such as boron carbide, twin diamond, silicon carbide and other group III and IV intergroup compounds are also known as superhard materials and have been continuously developed. In addition, at present, some new superhard materials such as carbon nitride, wurtzite boron nitride (WBN), lonsdaleite are also constantly explored.

Introduction to Several Other Superhard Materials

Here, in addition to the well-known diamond and CBN, several other superhard materials are briefly introduced.

Boron Carbide
It is a black crystalline compound or solid solution with a rhombic hexahedral structure. It has a Mohs hardness of 9.497, second only to diamond and cubic boron nitride, and is known as the third hardest material. Most importantly, it has a near-constant high temperature hardness (>30GPa), which is unmatched by other materials.

Silicon Carbide
Silicon carbide is usually divided into two types of black silicon carbide and green silicon carbide, and both are hexagonal crystals. Silicon carbide has a high hardness and the hardness of green silicon carbide is even close to diamond.

Wurtzite Boron Nitride (WBN)
It has a similar structure to diamond, but the atoms are different. In WBN, boron and nitrogen atoms form tetrahedrons, but the angles between adjacent tetrahedrons are different. According to relevant reports, the hardness of WBN is even higher than that of diamond.

Lonsdaleite
Lonsdaleite, also known as hexagonal diamond, is an allogenous crystal of hexagonal lattice carbon. If the impurities can be strictly controlled in the synthetic process to obtain a complete and flawless lonsdaleite crystal, a new superhard material with a hardness greater than diamond can be obtained.

Carbon Nitride
The structure of carbon nitride was proposed in 1985. This compound has the same structure as silicon nitride (SiN). It is predicted that its hardness may be greater than diamond.

Find More Superhard Materials At Alfa Chemistry

Alfa Chemistry is the world's leading manufacturer and marketer of superhard material, and we provide you with a wide range of high-quality diamond and cubic boron nitride products. In addition, we can also provide you with high quality boron carbide, silicon carbide and wurtzite boron nitride (WBN). Please click the links below to find the more superhard product at Alfa Chemistry.

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