Advanced Ceramic Materials

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

Boron nitride is a white solid ceramic material, with a nickname of "white graphite" because of its similar appearance and structure. Boron nitride ceramic is an excellent material which has low porosity, good thermal conductivity, low dielectric constant and superior dielectric strength. It is easily machined into complex shapes, and then ready for use without additional heat-treating or firing operations. Boron nitride has a variety of different variants: hexagonal boron nitride (h-BN), rhombohedral boron nitride (r-BN), cubic boron nitride (c-BN) and wurtzite boron nitride (w-BN). The most commonly used in the industry are h-BN and c-BN. H-BN & C-BN Hexagonal boron nitride, abbreviated as hBN, is an electron body having a layered structure similar to graphite. It has good lubricity, electrical insulation, thermal conductivity, and chemical resistance, and also has the ability to absorb neutrons. It is made of nitrogen (such as urea, melamine, etc.) and boron (b