Alumina ceramics have the advantages of good thermal conductivity, good adhesion to metals, and high electrical insulation, and are currently a development hotspot in the field of integrated circuit packaging.

In order to solve the problems of low solid content, high shrinkage, high sintering temperature, and easy deformation of the thin plate in the preparation of ceramic substrates by tape casting, a new method was proposed to reduce the sintering temperature and maintain the excellent thermal conductivity of the substrate through material microstructure design . A new casting -warm-pressing composite molding process, using micron -modified nano-alumina powder as the basic material, using the space-densifying filling effect of micron and nano-particles to obtain the maximum solid addition, and controlling the micron by warm-pressing molding The spatial arrangement of nanopowders and the microstructure of the substrate after sintering can achieve dense sintering at a lower temperature , and realize the mass production of large-sized alumina ceramic substrates with low cost and consistent quality , so as to meet the high heat requirements of ceramic substrates for electronic packaging. Conductivity, high strength, low dielectric constant and other performance requirements.

Alumina ceramics are currently divided into two types: high-purity type and ordinary type. High-purity alumina ceramics areceramic materials with an Al 2 O 3 content of more than 99.9%. Because the sintering temperature is as high as 1650-1990°C and the transmission wavelength is 1-6 μm, it is generally made into molten glass to replace platinumcrucible _: use _its transmissionLight and alkali metal corrosion resistance can be used as sodium lamps; in the electronics industry can be used as integrated circuit substrates and high-frequency insulating materials.

Alumina ceramic material is one of the most widely used ceramic materials. Research on alumina materials abroad started earlier, especially in high-tech fields such as machining, medicine, aerospace and so on. However, the domestic research on alumina materials is relatively late, the technology is relatively backward, and the production technology in the manufacturing industry is relatively backward, and the equipment is not perfect, so there is still a certain gap in product quality compared with western developed countries. Therefore, it is imminent to improve the research level of alumina materials in my country and vigorously promote the application of alumina materials.