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Product Name: refractory industrial custom made mullite ceramic crucible machinery parts supplier
Date of listing:2019-01-24
  • refractory industrial custom made mullite ceramic crucible machinery parts supplier refractory industrial custom made mullite ceramic crucible machinery parts supplier
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refractory industrial custom made mullite ceramic crucible machinery parts supplier

Mullite Ceramics:
Mullite ceramic refers to a ceramic whose main crystal phase is mullite. Mullite is the only stable binary compound in the Al2O3-SiO2 system. The composition can vary from 3Al2O3·2SiO2 to 2Al2O3·SiO2, that is, the Al2O3 content can fluctuate within the range of 71.8-77.3 wt%. 3Al2O·2SiO2 is the stoichiometric composition and content of mullite.

Mullite Ceramics properties:
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. High-purity ultrafine powder prepared by alkoxide hydrolysis method, transparent mullite porcelain can be obtained by vacuum sintering at 1750 °C.

Data Sheet↓

Item

Unit

Typical Values

Physical Properties

Color

White/Ivory

Raw material

/

Alumina, silicon oxide

Gas permeability

0

Water Absorption

0

Mechanical Properties

Rockwell  Hardness(45N)

R45N

40

Vickers Hardness (Load 500g)

Gpa(Kg/mm²)

11.5(1175)

Flexural Strength(20°C)

Mpa

108

Compressive Strength(20°C)

Mpa

488

Modulus of Elasticity(25°C)

Gpa

65

Thermal Properties

Thermal Conductivity(25°C)

W(m.K)

1.71

Thermal Expansion Coefficient

10-7/ºC

5.5

Thermal Shock Resistance

△T°C

200

Maximum Use Temperature

°C

1200

Electronic Properties

Dielectric Constant

Er

3.5-3.7

Volume Resistivity(20°C)

Ω.cm

1×1019 1×1015

Application :
Refractory
High temperature engineering materials
Electronic packaging material
Optical material


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