1,are fabricated by sinteringof high temperature using fused stabilized hollow zirconia sphere as starting material , via molding.

2, They have many advantages,such as high temperature resistance (max. usage temperature≥2200°C),

3,high strength ,

4,good thermal insulation, various acid-base erosion resistance and thermal shock stability.

They are widely used in super-high temperature kilns of mid-frequency furnace, military and civil , scientific research, refining of high-melting point metals ,laser crystals, quartz glass and electron field of tungsten and molybdenum industry.