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Insulating mullite ceramic tube fire-proof ceramic tube
Mullite Ceramics:
Mullite ceramics is a general term for a class of ceramics in which
the main crystal phase is mullite (3Al2O3·2SiO2). If the mullite
porcelain without glass phase is prepared from synthetic ultra-fine
high-purity mullite powder, it is also called new mullite ceramic,
that is, high-purity mullite ceramic.
Optical performance
Although the mullite crystal is not a cubic crystal system, it is
only an orthorhombic system, but due to the small birefringence of
light (only 0.012), a ceramic material having a certain
transparency can be obtained under certain conditions. The
high-purity ultrafine powder prepared by the alkoxide hydrolysis
method can be obtained by vacuum sintering at 1750 ° C to obtain
transparent mullite porcelain.
| Item | Test Condition | Unit&Symbol | Cordierite ceramics |
| The main chemical ingredient | MgO, Al2O3,SiO2 | ||
| Bulk Density | gm/cc | 2.6 | |
| Maximum Use Temperature | 1400℃ | ||
| Hardness | HV | 800 | |
| Bending Strength | 20℃ | Kgf/cm2 | 900 |
| Compressive Strength | 20℃ | Kgf/cm2 | 3500 |
| Fracture Toughness | K(I c) | Mpa m1/2 | - |
| Thermal expansion | 1X 10-6/℃ | ≤2.0 | |
| Thermal conductivity | 25℃-30℃ | W/m.k | 1.3 |
| Thermal Shock Resistance | Tc | ℃ | 250 |
| Dielectricity constant | 1MHz.25℃ | 6 | |
| Dielectric strength | ac-kV/mm (ac V/mil) | 10 | |
| Volume Resistivity | 20℃ | ohm-cm | > 1012 |
