Lanthanum hexaboride LaB6 cathode material: Lanthanum hexaboride has the characteristics of high emission current density and low evaporation rate at high temperature. Therefore, as a cathode material, it has gradually replaced some tungsten cathodes in industrial applications. At present, the main application fields of lanthanum hexaboride LaB6 cathode materials are as follows: 1 Microwave vacuum electronic devices and ion thrusters in the fields of military and space technology, and new technology industries such as display and imaging devices and electron beam lasers with high definition and high current emissivity required by civil and military industries. In these high-tech industries, the demand for low temperature, high uniform emission, high current emission density and high lifetime cathode materials has been very tight. 2 Electron beam welding industry. For electron beam welders, electron beam melting and cutting equipment. The cathode material should meet the re