|
Ceramic
Properties* |
Zirconia
(Yttria stabilized) |
Silicon
Carbide |
Alumina
Oxide |
Ruby
Sapphire |
Silicon
Nitride |
| Max. Useful Temperature |
1800°F |
2500°F |
3180°F |
3250°F |
2552°F |
| Density |
6.06/cm3
.219 lbs/in3 |
3.1 gm/cm3
.112 lbs/in3 |
3.86 gm/cm3
.139 lbs/in3 |
3.98 gm/cm3
.144 lbs/in3 |
3.2 gm/cm3
.116 lbs/in3 |
| Compressive Strength |
794,837 psi |
400,000 psi |
330,000 psi |
300,000 psi |
341,300 psi |
| Young's Modulus of Elasticity |
30.6 x 106 21700 kgf/mm2 |
53 x 106 psi |
54 x 106 psi |
50 x 106 - 55 x 106 psi |
47 x 106 psi |
| Hardness |
1250 kgr/mm2 |
2400 Vickers |
1365 Vickers |
1570-1800 Vickers |
1500-2000 Vickers |
| Thermal Conductivity |
0.007 cal/cm, Sec 0 |
145 W/m °C80 BTU/hr ft°F |
35.6 W/m °C. (@ 20°C) 6.3 W/m °C. (@800°C) |
086 Cal/sec cm °C |
.07 Cal/sec cm °C |
| Thermal Expansion |
10.9 x 10-6/°C |
2.5 x 10-6/°F |
4.6 x 10-6/°F |
3.2 x 10-6/°F |
1.78 x 10-6/°F |
| Electrical Resistivity |
2.2 x 1012 cm |
Data not available |
>1014 Ohm/cm (@25°C) 2.5 x 106 Ohm/cm (@900°C) |
109 Ohm/cm (@500°C)10 Ohm/cm (@2000°C) |
106 Ohm/cm (@500°C)105 Ohm/cm (@2000°C) |
| Corrosion Resistance |
Inert except for hydrofluoric and hot concentrated sulfuric acids. |
Inert to most substances. |
Inert to most substances, not recommended for environments of hydrochloric or hydrofluoric acids or strong alkaline solutions. |
Inert to most substances even at very high temperatures. |
Inert to most substances. |
Ruby Saphire Balls Information Page |
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