The physical properties of the contact materials commonly used

The physical properties of the contact material is contact materials research and choose one of the important performance index. Its physical properties including density, melting point, resistivity, temperature coefficient of resistance, thermal conductivity, elastic modulus and hardness, etc. Such as contact material composition design and preparation technology of small differences will lead to the large variation of the physical properties, combined with the particularity of contact materials using state, namely, physical properties and its electrical contact materials to use and has no direct corresponding relationship between performance and makes physical properties of contact materials is reference indicators, contact materials research often no standard between producers and users Prospective evaluation. Relevant national standards in our country, on the other hand, the physical properties of contact materials only for density, resistivity and hardness proposed specific indicators, its rationality, integrity, questionable.