Description of zirconia brick

Zirconia bricks are refractory products produced from zirconia as the main raw material. There are two main manufacturing methods: sintering and casting. There are three crystal forms of zirconia: monoclinic, tetragonal and cubic. The densities of the three crystal forms are 5.68 g/cm3 (monoclinic), 6.10 g/cm3 (tetragonal), and 6.27 g/cm3 (cubic). Zirconia has a high melting point, high temperature structural strength, and acid and alkali corrosion resistance.

The main classification of zirconia bricks

Dense zirconia brick

It is formed by isostatic pressing. Its technical indicators are ZrO2>65%, apparent porosity <2.0%, and bulk density of about 4.25g/cm3. In E glass, the temperature exceeds 1370 ℃ and there is erosion. It is used in the bottom of the melting part of the E glass unit kiln where the temperature of the molten glass is slightly lower, the bottom of the transition passage, the bottom of the forming passage, the liquid groove of the forming passage and the leakage plate support bricks, etc. In addition, dense zirconium bricks are also used as backing bricks for dense chrome bricks.

The commonly used international brands are ZS-1300, ZS-1500, ZS-835 and ZS-78 produced by CORHART Company in the United States, ZS65WA produced by VGT-DYKO Company in Germany, UC-Z, UC-CZ, UC produced by Shinagawa Co., Ltd. in Japan -CZB et al. In recent years, ou r country's refractory enterprises have introduced foreign technology and equipment, and have also produced sintered dense zirconium bricks formed by isostatic pressing, which have been partially used in domestic glass and glass fiber kilns.

Standard zirconium brick

The ZrO2 content of the brick is about 66%, the bulk density is 3.7g/cm3, and it has good thermal stability and peeling resistance. It is used in the breast wall and rear wall of the feeding port area where the powder erosion is more serious, the breast wall and top cover brick and burner brick of the furnace observation hole brick and the passage flame space