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Fused Cast High Zirconia Block vs. Fused Cast AZS Block

Fused Cast Zirconia refractories are the best glass contact refractory materials which features improved corrosion resistance to melt glasses. The two most widely used fused cast zirconia refractories in glass industry are fused cast zirconia block and fused cast AZS block.

Fused Cast High zirconia block contains from 80 to 95 wt% of ZrO2. It is known for their very good corrosion resistance with no coloration of the glass and with no generation of defects. Fused cast AZS block contains from 33 to 41 wt% of ZrO2. It is the most widely used materials both in glass contact and superstructure of glass melting furnaces.

Fused Cast High Zirconia Block vs. Fused Cast AZS Block

Both of fused cast zirconia block and fused cast AZS block are manufactured by fused cast (electro cast) the process of which includes melting, casting, cooling and annealing. The manufacturing process of high zirconia block is more complex than fused cast AZS block. Fused cast High zirconia block is made from pure zircon sand. Fused cast AZS block is made from pure alumina powder and Zircon sand (composed of 65% zirconia and 34% SiO2).

The major crystal phase of fused cast high zirconia block is baddeleyite, with a small amount of a matrix glass phase surrounding the baddeleyite crystal phase. Fused cast AZS contains corundum crystals, baddeleyite crystals and a matrix glass phase. As fused cast high zirconia block contains less glass phase than fused cast AZS block, it has better corrosion resistance.

Fused Cast AZS are the most widely used materials both in glass contact and superstructure of glass melting furnaces. Fused Cast High zirconia block is a new refractory materials developed recently used in glass furnaces where the quality of glass is prior, specially used in high quality and special glass furnaces such as TV glass, Borosilicate glass, Alumina silicate glass, Halogen lighting glass, Opal glass and Fiber glass. Its application is expected to expand to the field of special glass.

In alkaline glass furnaces, the corrosion resistance of fused cast high zirconia block is not as good as fused cast AZS block 41#, but it is still used in some applications due to its no generation of glass defects. In alkali glass furnaces, it is preferred as it is almost not corroded by melt glass and cause no defects.

When selecting refractories, it is necessary to make decision based on the overall economic efficiency. Although fused cast high zirconia block has advantages over fused cast AZS block in many applications, it is more expensive as its ZrO2 content is very high. In the float glass furnaces and other glass furnaces which are not quite demanding on the quality of glass, fused cast AZS bloc is a more economic choice.

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Fused Cast High Zirconia Block vs. Fused Cast AZS Block

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