Technical development of fused cast refractory bricks for glass kilns

Fused mullite bricks → Fused zirconium mullite bricks → AZS bricks

Initially in the 50’s glass kiln use fused cast mullite brick, later introduced ZrO2, improve the organisation of mullite, improve the chemical resistance of mullite brick, heat vibration resistance and reduce the coefficient of expansion, changed the name to zirconium mullite brick, with the development of the industry, zirconium mullite brick can no longer meet the requirements of corrosion resistance, and so the AZS brick came into being.

These three types of fused cast refractory bricks represent a step forward in refractory technology:

1. Fused cast mullite bricks

   • Basic fused cast refractory

   • Good thermal shock and corrosion resistance

   • Suitable for use at high temperatures but not in direct contact with highly corrosive media

2. Fused zirconium mullite bricks

   • Addition of zirconium oxide to mullite

   • Significantly improves erosion resistance

   • Suitable for contact with corrosive media such as glass liquids

3. Fused cast AZS bricks (alumina-zirconia-silica)

   • High-quality fused cast refractory

   • Excellent erosion resistance to liquid glass

   • Used in the most critical parts of glass furnaces

Key technical parameters

Fields of application

• Glass kilns

• Metallurgical heating furnaces

• Ceramic tunnel kiln, etc.