Explanation

ceramics with beryllia as the main component. Pure beryllium oxide belongs to the cubic crystal system. density 3.03g/cm3, melting point 2570 ° C. It has high thermal conductivity, almost equal to purple copper pure aluminum, and has good thermal shock resistance. Its dielectric constant is 67 (0.1MHz). The biggest disadvantage is that powder is highly toxic and difficult to heal the contact wound. It is made by sintering beryllium oxide powder without adding alumina and other ingredients at high temperature. Making this kind of ceramics requires good protective measures. beryllia will become more volatile in high temperature medium containing water and gas. It will start to volatilize at 1000 ° C, and the volatilization will increase with the temperature rising, which will bring difficulties to production. Some countries have stopped producing it. However, the product has excellent performance. Although the price is high, there is still a considerable demand for it. It is used as materials for large-scale integrated circuit substrate, high-power gas laser tube, heat sink shell of transistor, microwave output window, neutron retarder, etc.

Classification