Alumina ceramic possesses high hardness, with a Rockwell hardness of HRA 80–90, second only to diamond. Its wear resistance is equivalent to 266 times that of manganese steel and 171.5 times that of high-chromium cast iron; under identical operating conditions, it can extend equipment service life by at least tenfold.
Alumina ceramic substrates can be classified according to purity into grades such as 90% alumina, 96% alumina, 99% alumina, and 95% alumina. The main difference lies in the doping amount in the substrate - the lower the doping, the higher the substrate purity. Alumina ceramic substrates of different purities exhibit variations in both electrical and mechanical properties: higher-purity ceramic substrates generally have higher dielectric constants, lower dielectric loss, and better surface smoothness.
In addition, alumina ceramic substrates offer advantages such as high thermal conductivity, high electrical resistivity, excellent thermal stability, and low dielectric constant, making them the material of choice for next-generation microelectronic devices and systems. They have been widely used in aerospace, 5G communications, high-power semiconductors, high-power LED lighting, and other fields.
The rapid development of the semiconductor and electronic information industries has imposed increasingly stringent requirements on the performance of core materials. As key foundational materials with multifunctional coupling characteristics - electrical, magnetic, thermal, and mechanical - electronic ceramics are widely used in core components such as capacitors, filters, sensors, and packaging substrates. Among these, ceramic substrates represent an important product form of electronic ceramics in the field of power semiconductor packaging. Their thermal conductivity, mechanical strength, reliability, and precision directly determine the performance and service life of end products. This discussion focuses on the core topics of ceramic substrate/electronic ceramic material design, fabrication processes, performance testing, and application scenarios.