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We mainly produce 99.7% alumina tubes, rods and various industrial ceramic parts, which are mainly used in thermalcouple temperature, liquid steel continous temperature, various industrial furnace(containing vacuum furnace, carburizing furnace, wire furnace, atmosphere furnace etc), especially widely used in petrochemical, spinning, electric, instrumentation, mechanical workout, military project etc industry.
1. Main performance index
Serial number | performance index | Measuring unit | High purity alumina | Alumina | High alumina |
1 | Al2O3 | % | 99.7 | 99.3 | 85 |
2 | SiO2 | % | less than0.1 | — | — |
3 | Density | g/cm3 | 3.95 | 3.88 | 3.2 |
4 | Wter absorption | % | 0 | 0.01 | 0.2 |
5 | Cld compressive strength | MPa | 450 | 350 | 200 |
6 | 20 degree Celsius leak rates | Torr/L.sec | less than10-11 | less than10-11 | less than10-11 |
7 | Twisting in high temperature | mm | 1700 degree Celsius 0.2 allowance | 1600 degree Celsius 0.2 allowance | 1400 degree Celsius 0.2 allowance |
8 | Bonding in high temperature |
| 1700 degree Celsius non-caked | 1600 degree Celsius non-caked | 1400 degree Celsius non-caked |
9 | 20—1000 degree Celsius coefficient of thermal expansion | mm.10-6/degree Celsius.m | 8.6 | 8.2 | 8.2 |
10 | Thermal conductivity | W/m.k | 25 | 25 | 25 |
11 | Electric insulation strength | KV/mm | 20 | 20 | 15 |
12 | 20 degree Celsius direct current insulating resistance | Ohm/cm | 1014 | 1014 | 1014 |
13 | High-temperature insulation resistance | 1000 degree Celsius MΩ | ≥0.08 | ≥0.08 | ≥0.08 |
1300 degree Celsius MΩ | ≥0.02 | ≥0.02 | ≥0.02 | ||
14 | Thermal shock resistance |
| 1550 degree Celsius 6 times not cracked | 1550 degree Celsius 6 times not cracked | 1300 degree Celsius 3 times not cracked |
15 | Maximum service temperature | degree Celsius | 1900 | 1800 | 1400 |
ceramic parts