High-performance silicon nitride ceramic materials developed for the aluminum industry has significantly improved
thermal and mechanical properties than similar products. On this
basis, the "L-shaped high thermal conductivity submerged heating
"Appliance" will bring revolutionary progress to aluminum
industrial equipment.
The silicon nitride-lined launder pioneered by "Silicon Poly"
solves the troubles that have been plagued workers in the aluminum
industry.The silicon nitride lining does not stick to aluminum water, so the
launder almost does not need to be cleaned, which greatly reduces
the labor intensity of the workers;
Advantage:
Compared with the casting material launder, the service life is
greatly extended.
The launder does not need to be sprayed with anti-stick coating,
which ensures the purity of molten aluminum;
Silicon Nitride Related Data
| Main component | 99%Al2O3 | S-SiC | ZrO2 | Si3N4 |
|
Physical
Property | Density | g/cm3 | 3.9 | 3.1 | 6 | 3.2 |
| Water Absorption | % | 0 | 0.1 | 0 | 0.1 |
| Sinter Temperature | °C | 1700 | 2200 | 1500 | 1800 |
Mechanical
Property | Rockwell Hardness | HV | 1700 | 2200 | 1300 | 1400 |
| Bend Strength | kgf/mm2 | 3500 | 4000 | 9000 | 7000 |
| Compression Intensity | Kgf/mm2 | 30000 | 20000 | 20000 | 23000 |
Thermal
Property | Maximum working
temperature | °C | 1500 | 1600 | 1300 | 1400 |
thermal expansion
coefficient
0-1000°C | /°C | 8.0*10-6 | 4.1*10-6(0-500°C) | 9.5*10-6 | 2.0*10-6(0-500°C) |
| 5.2*10-6(500-1000°C) | 4.0*10-6(500-1000°C) |
| Thermal Shock resistance | T(°C) | 200 | 250 | 300 | 400-500 |
| Thermal Conductivity | W/m.k(25°C | 31 | 100 | 3 | 25 |
| 300°C) | 16 | 100 | 3 | 25 |
Electrical
Property | Resisting rate of Volume | ◎.cm | | | | |
| 20°C | >1012 | 106-108 | >1010 | >1011 |
| 100°C | 1012-1013 | – | – | >1011 |
| 300°C | >1012 | – | – | >1011 |
Insulation Breakdown
Intensity | KV/mm | 18 | semiconductor | 9 | 17.7 |
| Dielectric Constant (1 MHz) | (E) | 10 | – | 29 | 7 |
| Dielectric Dissipation | (tg o) | 0.4*10-3 | – | – | – |
