Grinding Theory:

      Zirconia has three crystal form: monoclinic, the Quartet, Cubic phase. Zirconia only at room temperature to a monoclinic phase, heated to about 1100 ℃ into tetragonal phase, heated to a higher temperature will be translated into cubic phase. As the monoclinic phase transformation in both directions when the Quartet will have a greater volume changes, cooling time will be in the opposite direction in the larger volume changes, making it easy for cracking products, limiting the pure zirconium oxide in the field of high-temperature applications. But add stabilizer, the tetragonal phase can be stable at room temperature, it will not happen in the heat after the volume of mutation, the zirconia greatly expand the scope of the application.