Corundum Refractory Product Series

Products produced by combining corundum with other phases have excellent resistance to thermal shock, corrosion, scouring and peeling. They are high-quality materials suitable for glass kilns, cement kilns, alumina kilns, heating kilns, steel drums, non-ferrous metal smelting furnaces and chemical kilns.
Titanium corundum bowls and titanium corundum rings are used in conjunction with glass kiln feeder basins, and have excellent resistance to glass liquid erosion and scouring.

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Description

Corundum brick products

Corundum brick products are aluminum-silicon refractory products with corundum as the main crystal phase. Corundum bricks have excellent high-temperature mechanical properties, good corrosion resistance and wear resistance.

Raw materials for corundum brick products Natural hydrous aluminum oxides include gibbsite and diaspore. These hydrates can be heated and dehydrated to obtain alumina (γ-Al2O3). Then they are heated to 1450℃ and converted into corundum (α-Al2O3). Since natural corundum and natural pure diaspore are rare in nature, industrial alumina is used as the raw material for making corundum. The industrial alumina produced is mainly α-Al2O3. The volume shrinkage rate is 13% when γ-Al2O3 is converted into α-Al2O3. In order to make the α-Al2O3 grains develop well, the raw materials need to be treated at a higher temperature. After high-temperature sintering, the α-Al2O3 grains can grow 25 to 40 times.

Manufacturing process of corundum brick products Corundum bricks are divided into three types: fused corundum bricks, fused corundum re-sintered bricks, and sintered corundum bricks. Fused corundum bricks are made by melting industrial alumina, a small amount of soda ash and quartz powder in an electric arc furnace, and then undergoing casting, annealing and other processes, and finally mechanically processed into the required shape and size. Fused corundum re-sintered bricks are made by adding a small amount of clay and binder to crushed fused corundum particles and fine powder, and then forming them with a brick press after sufficient mixing. The density of the brick is 2.75~2.85g/cm3. After the brick is dried, it is fired at 1700~1800℃.

Performance Corundum brick products have a series of excellent properties, high mechanical strength and high hardness. In addition, they also have good wear resistance, oxidation resistance, corrosion resistance and electrical insulation properties.

Products/Index		Unit	Corundum brick Titanium corundum brick						chrome corun- dum brick	Titanium corundum brick
			C90		C95		C99		CC10	TC
			Pressing	Casting	Pressing	Casting	Pressing	Casting
Al₂O₃≥		%	90	90	95	95	99	99	A	94
Fe₂O₃≤		%	0.4	0.4	0.3	0.3	0.1	0.1	0.2	0.2
Cr₂O₃≥		%	-	-	-	-	-	-	10	(TiO₂)1.0
Apparent porosity ≤		%	16	18	16	18	16	18	16	2
Bulk density≥		g/cm³	3.1	3.05	3.15	3.1	3.2	3.15	3.3	3.6
Cold crushing strength≥		MPa	11001	190	1100	90	1001	90	11001	300
Refractoniness under bad(02MPa)≥		℃	11700	1650	1700	1650	1700	1650	1700	1700
Reheating linear change	1550℃x2h	%	±0.1	±0.1	±0.1	±0.1	-	-	-	-
	1600℃×2h	%	-	-	-	-	±0.1	±0.1	±0.1	±0.1\|

Note: The indicators in the table are typical values of standard bricks.

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