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Characteristics And Preparation Method Of Hafnium Boride Powder

2018-10-17      View:

Hafnium boride is a member of the family of ultra-high temperature materials. Due to its high melting point (3380 °C), excellent thermochemical stability and excellent physical properties, including high modulus of elasticity, high hardness and good thermal shock resistance, it can maintain high strength at high temperatures and is the most promising candidate material.


 

The main preparation methods of HfB2 powder are metal and boron in an inert gas or vacuum fusion synthesis method, carbon reduction method, self-propagating high-temperature synthesis method, chemical vapor infiltration method.

 

High purity HfB2 powders have been successfully prepared by HfO2 and B4C reactions under vacuum conditions. The grain size of hafnium boride increases with the increase of sintering temperature and holding time, and the influence of holding time is more obvious. Excess boron carbide contributes to the crystallinity of the lanthanum boride powder, and the crystallinity of lanthanum boride is increased as the boron carbide is increased.

 

At present, HfB2 ceramics only serves as a phase in the composite material to adjust the structure and composition of the composite material, or as a main phase in the composite phase ceramics to consider the addition of matching materials to improve its sintering properties and increase its oxidation resistance and strength. As a refractory material, HfB2 has very good comprehensive high temperature performance, high temperature strength, thermal shock stability, corrosion resistance, etc. It is a promising high performance refractory material.