Nitreto de Boro Usado em Cerâmica Composta

Boron nitride material has high thermal stability, chemical stability and electrical insulation. At the same time, it has the characteristics of high thermal conductivity, good dielectric properties, and easy processing of products. Its melting point is as high as 2800 degree . It is a typical electrical insulator and an excellent thermal conductor. These unique natural characteristics of BN materials combined with TiB2 can improve the material's thermal conductivity and obtain appropriate resistivity and temperature coefficient of resistance.

BN composite conductive ceramic material evaporation boat is mainly used in vacuum plating industry. Vacuum plating mold is a method to convert vapor-deposited metal materials such as aluminum, silver, gold, titanium, etc. into a vapor under vacuum and high temperature, and then plate it onto metal, glass, silicon wafer, organic mold, paper and other base materials to form a substrate. Metal thin film coatings of tens to hundreds of angstroms. The crucible or boat used for carrying the vapor-deposited metal that has high temperature resistance, resistance to metal solution erosion, strong thermal shock resistance, and heat conduction is the "evaporation boat". Since the introduction of vacuum plating technology in the 1970s, the use of evaporation boats has ranged from the earliest graphite crucibles to later double-crucible systems with boron nitride linings in heating carbon containers, which have poor corrosion resistance and long service life. Short wait can not achieve satisfactory results. It was not until the United Carbide Corporation in the United States introduced the boron nitride composite conductive ceramic material into the production of vacuum plating evaporation boats, and gradually improved and improved the material performance and service life of the evaporation boats.

Além disso, a combinação de alta resistência à ruptura dielétrica e alta resistividade de volume faz com que os produtos cerâmicos h-BN sejam usados ​​como isolantes elétricos. Devido à sua tendência a ser oxidado em altas temperaturas, é frequentemente usado em operações de vácuo e atmosfera inerte. A inércia química do nitreto de boro o torna amplamente utilizado em mangas de proteção de termopares, cadinhos e revestimentos de vasos de reflexão, mas para evitar atmosferas oxidantes durante a aplicação.