Many people believe that ceramic substrates are the future trend of the electronics industry, and this trend is irreversible-this is mainly due to the fact that ceramic substrates can solve the increasingly serious heat dissipation problem of electronic packaging compared to other substrate materials. Therefore it is highly valued.
At present, ceramic substrate materials mainly include alumina, beryllium oxide and aluminum nitride. Among them, alumina ceramics is the most mature type. It is widely used for its good thermal shock resistance and electrical insulation properties, as well as mature manufacturing and processing techniques .
In fact, although ceramic substrates have been maturely used in the fields of LED high-power lighting, high-power modules, refrigeration films, automotive electronics, etc., due to the difficulty of production and fewer manufacturers, product prices have always been high, and the market is dependent on external high.
Take the alumina substrate as an example. According to its purity, it can be divided into different models such as 75% alumina ceramic, 85% alumina ceramic, 95% alumina ceramic and 99% alumina ceramic. The biggest feature is that the dielectric loss is low, the electrical performance is not much related to temperature, the mechanical strength is high, and the chemical stability is good-and with the increase of alumina content, the above advantages will be further amplified, so 99.5%, even The market for 99.9% alumina ceramic substrates is very impressive. However, it is not easy to make a high-purity alumina substrate. Elastic modulus, elastic deformation cycles, service life and reliability are indispensable. Therefore, there are not many companies capable of doing well.
Application of high purity alumina substrate
When it comes to the application of alumina substrates, one must mention the high-frequency circuit substrates. In recent years, the electronic communication market, which is dominated by 5G communication, is developing rapidly, and product technology is constantly innovating. The requirements for high-frequency and high-speed signals on materials are also increasing. In the choice of materials, high-purity alumina ceramics are the first choice because they can well meet the characteristics of high-frequency signals (high frequency: 300MHZ or more, that is, the shortwave frequency range with a wavelength of 1 meter or more).