The difference between alumina powder and white corundum powder
①. Alumina powder
1. Appearance: white powder, crystal phase;
2. Average particle size of nm, : 20±5;
3. Content %: greater than 99.9%;
4. Melting point: 2010℃-2050 ℃;
5. Boiling point: 2980 ℃;
6. Relative density water =1, 3.97-4.0;
7. Color: white, dark blue after calcination.
②. White corundum powder
1. Density: 3.90g /cm3; Melting point: 2250C;
2. Crystal shape: tripartite crystal system;
3. Hardness: Nu spectrum hardness 2000-2200kg /mm2, Mohs hardness 9.0;
4. Coefficient of linear expansion: 7-9, *10^-6/K0-1600C
5. Service temperature: 1900C;
6. Specific heat Cal/g.C: 0.2620-90C;
7. Coefficient of heat conductivity: room temperature 900CCal/cm3 SEC.C,
8. Refractive index: E =1.760 W =1.768Na line,
Alumina
powder can be used in heat conduction, polishing, electroplating,
catalyst, etc. White corundum powder can be used as contact media,
insulator and precision casting sand, etc. After understanding the
differences, users can choose suitable products according to different
needs.
