Beryllium oxide ceramics are ceramics with beryllium oxide as the main component. Mainly used as materials for large-scale integrated circuit substrates, high-power gas laser tubes, heat sink shells of transistors, microwave output windows and neutron moderators. Pure beryllium oxide (BeO) belongs to the cubic crystal system with a density of 3.03g/cm3. With a melting point of 2570°C, it has high thermal conductivity, almost equal to copper pure aluminum, thermal conductivity λ of 200-250W/(m.K), and good thermal shock resistance. Its dielectric constant is 6-7 (0.1MHz). The dielectric loss tangent is approximately
4×10-4 (0.1GHz). The biggest disadvantage is that the powder is Boron Nitride Ceramic Shaft highly toxic and makes it difficult to heal contact wounds. It is made by high temperature sintering with beryllium oxide powder as raw material, adding alumina and other ingredients. The manufacture of such ceramics requires good protective measures. The volatility of beryllium oxide in a high-temperature medium containing water Boron Nitride Ceramic Shaft vapor will increase. It starts to volatilize at 1000°C, and the volatilization volume increases with the increase of temperature. This brings difficulties to production, and some countries no longer produce it. However, the product has excellent performance, and although the price is relatively high, there is still considerable demand. BeO began as an insulating material in 1928, but until 1930, BeO was mainly mixed with other materials as fluorescent materials, and high-purity beryllium oxide porcelain was produced for the first time during World War II. It was learned in 1946 that beryllium oxide has a very high thermal conductivity. And it was mainly used in nuclear devices at that time. Until the mid-1950s, beryllium oxide appeared in applications in electronics, measuring instruments, communications and aerospace Boron Nitride Ceramic Shaft technology.
The melting temperature of beryllium oxide ranges from 2530°C to 2570°C, and its theoretical density is 3.02g/cm3. It can be used for a long time at 1800°C in a vacuum, at 2000°C in an inert gas, and 1800°C in an oxidizing atmosphere. It evaporates at ℃. The most outstanding performance of beryllium oxide ceramics is its large thermal conductivity, which is similar to metal aluminum and 6-10 times that of aluminum oxide. It is a dielectric material with unique electrical, thermal and mechanical properties. No other material shows this. Comprehensive comprehensive performance. The performance comparison between beryllium oxide and other insulating materials is listed in Table 1.
What is beryllium oxide ceramics?
2021 08/02