Items |
Al2O3 |
ZrO2 |
TiO2 |
Fe2O3 |
SiO2 |
ZA25 |
68-72 |
24-30 |
≤1.5 |
≤0.5 |
≤1.0 |
ZA40 |
55-57 |
35-44 |
≤1.5 |
≤0.5 |
≤1.0 |
Crystal Form |
Monoclinic,tetragonal system |
Reaction with acid and alkali |
no |
Reaction with carbon |
Forming carbide since 1650C |
Color |
Grey |
True Density |
4.20g/cm3 |
Bulk Density |
2.18g/cm3 |
Moh's hardness |
9.0 |
Knoop hardness |
1450-2000kg/cm2 |
Melting point |
1900C |
Maximum service temperature |
1700C |
Specific heat capacity(cal/g.C) |
0.2205(50-500C) |
Heat conductivity |
0.2718 cal/cm2.sec.C |
Linear expansivity(X10-6) |
6.82(100-700C) |
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