Zirconia ceramics is a new type of high-tech ceramics. Compared with traditional alumina ceramics, it is much better in terms of texture, process and color. Zirconia ceramics have phase transformation toughening and microcrack toughening, so they are very high. Its strength and toughness are the highest in its fracture toughness in all ceramics.
Advantages of zirconia ceramics:
1. Insulation, no metal, electroplating pollution, is an ideal environmentally friendly material in the watch industry;
2, density color ceramic case, bezel, dial, buckle, case and other products, texture, visual excellence;
3, hard and beautiful, beautiful and durable, does not damage the skin, reveals the unique luster, the product is elegant and luxurious, bright and shiny
4. The hardness of zirconia ceramics is close to that of natural diamonds, lighter than metal, with gemstone characteristics such as never wearing or discoloring;
5, very high anti-wear, anti-oxidation, never rust, never change color, will never cause skin allergies;
Disadvantages of zirconia ceramics;
Zirconium oxide has three crystal forms: monoclinic, tetragonal, and cubic. At room temperature, zirconia appears only in a monoclinic phase, and is heated to a temperature of about 1100 ° C to transform into a tetragonal phase. When heated to a higher temperature, it is converted into a cubic phase. Due to the large volume change during the transition of the monoclinic phase to the 4-phase phase, a large volume change will occur in the opposite direction when cooling, which is likely to cause cracking of the product, which limits the pure zirconia in the high temperature field. use.
Zirconium oxide has high toughness due to the presence of stabilizers, but its high toughness is time-sensitive. For example, when zirconia devices are placed in air for a period of time, they are unstable, and the performance is severely degraded or even cracked. ! Moreover, there is no metastable phase at high temperature, so there is no high toughness characteristic, so the inability to use at high temperature and the aging time at room temperature seriously restrict the development of zirconia.
