Aluminium oxide (British English) or aluminum oxide (American English) is a chemical compound of aluminium and oxygen with the chemical formula Al2O3. It is the most commonly occurring of several aluminium oxides, and specifically identified as aluminium(III) oxide.
S.NO | CHARACTERISTICS | VALUE |
---|---|---|
1 | Principal Constituent Al2O3 Purity | >99.9% Al2O3 |
2 | Tolerance | +/-2% |
3 | Sintering Additives | Nil |
4 | Appearance | Pearl White |
5 | It is optically transparent in the near-ultraviolet, visible and infrared regions | Nil |
6 | Apparent Density | >3.89 g/cc |
7 | Grain Size | ~10 µm |
8 | Open Porosity | Nil |
9 | Hardness (Knoop 100g) | 23000 MPa |
10 | Compressive Strength | 3500 MPa |
11 | Bending Strength | 300 MPa |
12 | Modulus of Elasticity | 380 GPa |
13 | Melting Point | 2030oC |
14 | Maximum Working Temperature | 1800oC |
15 | Specific Heat | 900J/KgK |
16 | Thermal Conductivity at 100oC | 30 W/mK |
17 | Thermal Conductivity at 1000oC | 5 W/mK |
18 | Coefficient of Linear Expansion between 0-1000oC | ~8.5 x 10-6/K |
19 | Emissivity at 1000oC | ~21% |
20 | Surface Finish | 3 triangle or better |