Zirconia ceramic substrateZrO2 is pure white, yellow or gray when containing impurities, generally containing HfO2, which is not easy to separate. The production of zirconia heat conducting ceramic sheets requires the preparation of powders with high purity, good dispersing property, ultra-fine particles and narrow particle size distribution. The preparation methods of ultrafine powders of zirconia heat conducting ceramic sheets are many. The purification of zirconia heat conducting ceramic chips mainly includes chlorination and thermal decomposition, alkali metal oxidation decomposition, lime melting, plasma arc, precipitation, colloid, hydrolysis, and spray heating. Solution and so on. Zirconia ceramics can be customized according to the requirements of customer drawings.
Zirconia thermal conductive ceramic sheet has the characteristics of high melting point, hardness, strength and toughness. Its major characteristics are high hardness, low specific heat capacity and thermal conductivity, and it can form oxygen vacancy defect solid solution. It is widely used as structural ceramics and functional ceramics, such as cutting tools, mechanical components, high-grade refractory materials.
Zirconia ceramic is one of the earliest, widely used and more mature new ceramics, which is used in the industry of zirconia ceramic shaft, substrate, insulator, radar radome, microwave electrolyte and other electronic industrial ceramics.
There are three crystal types of zirconia heat conducting ceramic sheet. At room temperature, it is monoclinic crystal, which changes into tetragonal crystal when heated to about 1170 ℃, with a volume shrinkage of about 7%; when heated to about 2370 ℃, it changes into cubic crystal, and melts to about 2700 ℃, which is reversible. Zirconia has the characteristics of high melting point, hardness, strength and toughness, low specific heat capacity and thermal conductivity, and can form solid solution with oxygen vacancy defects. It is widely used as structural ceramics and functional ceramics, such as cutting tools, mechanical components, advanced refractories, high temperature anion conductors, oxygen sensors, etc. However, one of the disadvantages of zirconia ceramics is that its strength and toughness are seriously weakened at high temperature, which limits its application at commercial temperature.