Application scope of silicon nitride ceramic substrate silicon nitride ceramic substrate has the characteristics of high strength, high thermal conductivity and high reliability. It can be used to make circuits on the surface by wet etching process. After surface plating, it is a substrate material for packaging high reliability electronic substrate modules. It is the preferred substrate material for 1681 power control modules for new electric vehicles. In addition, the ceramic substrate industry also involves technologies in many fields, such as LED, fine ceramic preparation, thin film metallization, yellow light lithography, laser forming, electrochemical plating, optical simulation, microelectronic welding, etc. the products are in power transmitter, photovoltaic device, IGBT module, power thyristor, resonator base Semiconductor packaging carrier plate and other high-power optoelectronic and semiconductor devices are widely used.