Performance of zirconium powder: The molecular weight of zirconia is 123.22, the theoretical density is 5.89g/cm3, and the melting point is 2715 ℃. It usually contains a small amount of hafnium oxide, which is difficult to separate, but has no significant effect on the performance of zirconia. Zirconia has three crystal forms: monoclinic, tetragonal, and cubic. At room temperature, zirconia only appears as a monoclinic phase. When heated to around 1100 ℃, it transforms into a tetragonal phase, and when heated to higher temperatures, it transforms into a cubic phase. Due to the significant volume change during the transition from monoclinic to tetragonal phase, and the significant volume change in the opposite direction during cooling, it is easy to cause product cracking, which limits the application of pure zirconia in high-temperature fields. However, after adding stabilizers, the tetragonal phase can be stabilized at room temperature, so there will be no sudden change in volume after heating, greatly expanding the application range of zirconia. Due to its excellent physical and chemical properties such as high hardness, strength, toughness, high wear resistance, and chemical corrosion resistance, zirconia has been widely used in various fields such as ceramics, refractory materials, machinery, electronics, optics, aerospace, biology, chemical textiles, etc.