Tabular AluminaSTA
Description:
STA is a sintered alumina which is produced by pelletizing high purity calcined alumina without the use of additives and firing them in Shaft Kiln of a temperature at about 1,900℃ near the melting point of alumina. The alumina has been thoroughly densified and has well developed into alpha alumina crystals(α-Al2O3). STA is composed of tablet shaped crystals with a median range of 30 to 300microns. STA is widely used a refractory material due to its excellent thermal shock rseistance and excellent wear resistance.
Properties:
- High chemical purity and mechanical strength
- Great thermal shock resistance
- Excellent dielectric properties
- Low shrinkage characteristics
- Good resistance to acid and alkali corrosion
- Extremely high hardness and high abrasion resistance
Chemical & Physical Properties:
|
Item
Property
|
Crushed Sizes | Ground Sizes | Ball (-20㎜) | ||||
|---|---|---|---|---|---|---|---|
| Spec. | Typical | Spec. | Typical | Spec. | Typical | ||
|
Chemical Composition (wt. %) |
Al2O3 | 99.5 min | 99.6 | 99.0 min | 99.5 | 99.0 min | 99.5 |
| SiO2 | 0.10 max | 0.03 | 0.20 max | 0.06 | 0.20 max | 0.06 | |
| Fe2O3 | 0.10 max | 0.04 | 0.15 max | 0.05 | 0.15 max | 0.05 | |
| Na2O | 0.30 max | 0.25 | 0.35 max | 0.27 | 0.35 max | 0.27 | |
| CaO | 0.30 max | 0.05 | 0.30 max | 0.07 | 0.30 max | 0.07 | |
|
Physical Properties (6-10 mesh) |
Bulk Density (g/㎤) |
3.50 min | 3.62 | - | - | 3.50 min | 3.57 |
|
Apparent Porosity (%) |
5.00 max | 2.60 | - | - | 5.0 max? | 2.12? | |
Particle Size Distribution:
| Item | Unit | Specification | Typical | |||
|---|---|---|---|---|---|---|
|
Crushed Size |
8-5 ㎜ | ㎜ | +8.0 | -4.0 | +8.0 | -4.0 |
| % | 10 max | 7 max | 3.35 | 1.20 | ||
| 6-3 ㎜ | ㎜ | +5.60 | -2.80 | +5.60 | -2.80 | |
| % | 40 max | 10 max | 22.70 | 2.94 | ||
| 3-1 ㎜ | ㎜ | +3.35 | -1.00 | +3.35 | -1.00 | |
| % | 5 max | 10 max | 0.15 | 3.94 | ||
| 1-0.5 ㎜ | ㎜ | +1.00 | -0.50 | +1.00 | -0.50 | |
| % | 5 max | 10 max | 0.84 | 6.56 | ||
| 1-0 ㎜ | ㎜ | +1.00 | -0.212 | +1.00 | -0.212 | |
| % | 5 max | 35 max | 0.72 | 20.03 | ||
| 0.5-0 ㎜ | ㎜ | +0.50 | -0.075 | +0.50 | -0.075 | |
| % | 5 max | 20 max | 1.23 | 2.74 | ||
|
Ground Size |
-48 mesh | ㎜ | +0.30 | -0.075 | +0.30 | -0.075 |
| % | 5 max | 50-65 | 1.27 | 58.50 | ||
| -220 mesh | ㎜ | +0.30 | -0.075 | +0.30 | -0.075 | |
| % | 5 max | 60-85 | 0.05 | 78.36 | ||
| -325 mesh | ㎜ | +0.045 | -0.045 | +0.045 | -0.045 | |
| % | 5 max | 95 min | 0.84 | 99.16 | ||
| Discharge | Ball Type | ㎜ | - | +10 | - | +10 |
| % | - | 90 min | - | 95 | ||