The basic requirements of electric contact materials are good conductivity, low contact resistance and temperature rise, resistance to fusion welding and environmental media pollution
The electric contact forms are various, the process is complex, and the materials are various.The electric contact material is subjected to the joint action of electric arc, electric field, magnetic field, force, heat and atmosphere in the working process to achieve the performance of conducting current.
The research content of electrical contact materials is the relationship between material composition, structure, process and performance. In particular, it is a dynamic process that two conductive components contact with each other electrically to achieve current conduction, that is, from breaking to closing or from closing to breaking
According to the difference of current and size in this process, electric arc is generated in the dynamic process. The interaction between arc and electric contact material determines that most occasions of electric contact material are burning materials, and complex metallurgical, physical and chemical reactions occur in the burning process
Static state is the surface bonding state of two conductive components when closed conduction determines the size of the contact resistance between components, and its numerical value plays a key role in the functional realization and performance of the electrical contact components
