Low creep high alumina brick is produced on the basis of three stones (kyanite, andalusite and silimanite) theory, therefore, the chemical composition of low creep high alumina brick is similar to that of mullite. The raw materials of low creep high alumina bricks are high grade bauxite, binding clay, three stones, active alumina, etc. The ratio of Al2O3 and SiO2 is the key for the total transformation of mullite, so raw materials should be formulated accurately. As mullite has high temperature performance, low creep high alumina bricks also have good high temperature properties.
Low Creep High Alumina Brick for Sale in RS Refractory
Good thermal shock resistance.
Good abrasion resistance.
Good corrosion resistance.
Good high temperature mechanical strength.
Good volume stability, low creep rate.
Low Creep High Alumina Bricks Technical Index
Item
DRL-135
DRL-145
DRL-150
DRL-165
DRL-155
DRL-48
Al2O3, % ≥
70
75
80
65
55
48
Refractoriness ℃ ≥
1790
1790
1790
1790
1770
1750
Apparent porosity % ≤
20
20
19
24
24
24
Cold crushing strength MPa ≥
65
70
80
49
44.1
39.2
Reheating linear change rage % ≥
±0.1
±0.1
±0.1
+0.1~-0.4
+0.1~-0.4
+0.1~-0.4
1450℃*2h
1500℃*x2h
1450℃*2h
refractoriness under load (0.2Mpa) ℃ ≥
1500
1550
1650
1500
1470
1420
Creep rate % ≤
0.6
1350℃×50h
0.6
0.7
–
–
–
1450℃×50h
1500℃×50h
–
–
–
Low Creep High Alumina Bricks Applications
Although high alumina bricks have very high refractoriness, their refractoriness under load is relatively low. Low creep high alumina bricks have higher mullite content and lower glass phase, so they have higher thermal shock resistance, lower creep rate and higher refractoriness under load. Low creep high aluminum bricks are widely used in high temperature industrial kilns and furnaces. For example, inner lining of hot blast furnaces, glass melting tank where doesn’t contact with glass liquid, regenerator checker bricks work, and so on.
