Characteristics
This is pure α-alumina obtained by intensive sintering at temperatures above 1800 ° C, without the use of sintering additives. It is characterized by large, well-developed crystals of α-alumina up to 200 μm long, which are in the form of a hexagonal plate. Low thermal expansion and high heat resistance are explained by the features of the microstructure: low open porosity and large crystal size with closed spherical pores formed during intense sintering.
Physical &chemical properties
Style(Item)
| chemical index | physical index | |||||
Al2O3(%) | SiO2(%) | Fe2O3(%) | Na2O(%) | Volume density (g/cm3) | water absorption(%) | apparent porosity(%) | |
0-1mm 1-3mm 3-5mm 5-8mm |
99.3 min |
0.1 max |
0.08 max |
0.4 max |
3.5 |
1.5 |
5 max |
200#-0 320#-0 325# | 99.1 min | 0.15 max | 0.1max | 0.4 max | 3.45 | 2.0 | 6 max
|
Benefits
- extremely high fire resistance;
- high mechanical strength, wear resistance;
- high chemical purity;
- excellent dielectric properties;
- good corrosion resistance in acidic and alkaline environments.
