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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.
Mechanical properties
The mechanical properties of the high-purity mullite ceramic
sintered body are determined by the ratio of Al2O3/SiO2 and the
microstructure, especially the mullite ceramics with an Al2O3
content of 68%. The flexural strength at 1300 °C is 570 MPa, and
the fracture toughness Kic is up to 5.7MPa.Nm, which is 1.6 times
higher than normal temperature. This temperature increase, strength
and toughness not only do not attenuate but increase greatly. In
addition to SiC, it is unique in the existing high-temperature
ceramic materials, which is also high. Pure mullite ceramics are
excellent properties as high temperature materials.
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 |