What is magnesium-zirconium flow liquid hole cover plate brick?

The magnesium-zirconium flow liquid hole cover plate brick is made by magnesium-zirconium refractory material and is a key Block used to cover and protect the flow liquid hole of the glass kiln.

 

Main parameter:

·High temperature: used for a long time at temperatures above 1500 °C

 

·Chemical erosion: Subjected to continuous and high-speed erosion and penetration by the highly alkaline molten glass liquid.

 

Temperature fluctuation: Under conditions of kiln cooling, heating, or unstable working conditions, it will endure thermal shock.

 

·Mechanical stress: Experiencing pressure from the upper kiln structure and the flow stress of the glass liquid.

 

·Gas phase erosion: The alkali vapor (R₂O) in the kiln atmosphere will condense and erode the bricks.

 

Magnesium-zirconium bricks, due to their unique properties, have become the preferred or essential materials for modern high-performance glass kilns, especially for non-alkaline glass, electronic glass, and high-alkaline bottle and canning glass kilns.

 

 

Their main advantages are:

 

Extremely high resistance to erosion:

 

·Excellent resistance to penetration: The zirconium oxide in the material and the special microstructure can greatly prevent the glass liquid from penetrating into the brick body through pores and cracks, thereby reducing the depth and speed of erosion and increase of service life.

 

·Good thermal shock stability: Compared to electrically fused AZS bricks, high-quality sintered magnesium-zirconium bricks have better thermal shock resistance and can better adapt to the temperature changes of the kiln.

 

·Reduction of glass defects: Due to excellent resistance to erosion and penetration, the particles eroded off are very few, and stones, stripes, and other defects are not easily produced. They are particularly suitable for the production of high-quality glass.

 

·Adaptability to non-alkaline glass: For highly erosive non-alkaline glass (such as E glass), magnesium-zirconium materials are one of the few refractory materials that can resist its erosion for a long time.

 

Item	Testing condition	AZS41#	Fused cast 95 high zirconia	ZA80
Bubble precipitation	1300℃×10h Common soda lime glass	1.2	26.5	0
Linear Expansion	1200℃	0.81	0.96	0.73
Thermal Shock Resistance	1100℃ Water Cooling > 30	＞3	＞1	＞3
Bulk density	/	4.1	5.3	5
Apparent porosity	/	0.7	2	6
Erosion Rate at ½ Below Dynamic Liquid Level	1600℃ for 48h, 6r/min	0.15	0.09	0.01