Zirconium oxide ceramics are white in color and yellow or gray when containing impurities. They generally contain HfO2 and are not easily separated. There are three crystal states of pure ZrO2 under normal pressure. The production of zirconia ceramics requires the preparation of powders with high purity, good dispersion, ultrafine particles and narrow particle size distribution. There are many preparation methods for zirconia ultrafine powders. The purification of zirconia mainly includes chlorination and thermal decomposition, and alkali metals. Oxidative decomposition method, lime melting method, plasma arc method, precipitation method, colloid method, hydrolysis method, spray pyrolysis method, and the like.
Alumina ceramics is a ceramic material based on alumina (Al2O3) for thick film integrated circuits. Alumina ceramics have good corrosion resistance, wear resistance and high temperature resistance. Alumina ceramics is a versatile ceramic because of its superior performance, it has been used more and more widely in modern society, satisfying the needs of daily use and special performance.
Zirconium oxide ceramics and alumina ceramics are used under the same working conditions, and zirconia ceramics are more wear-resistant and more resistant to impact. But the price is very high, about 20 times the price of alumina. Therefore, alumina ceramics are more practical, and they are selected as wear-resistant materials in basic working conditions.