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)
|