Silicides ceramics
Silicides ceramics or aluminosilicate ceramics are a class of materials that include compounds based on silicon and other alloying additives. The class of materials has gained its popularity and popularity due to the relatively low cost and universal properties that satisfy many basic applications.
The main materials are:
-
Magnesium Steatite Silicate Mg3(Si4O10)(OH)2, with impurities of iron, aluminum, manganese, etc.
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Cordierite is an alumosilicate of magnesium and iron (Mg,Fe)[Al3Si5O18]*nH2O
-
Mullite - aluminosilicate 3Al2O3*2SiO2, 2Al2O3*SiO2
Specifications
|
Properties |
Conditions |
Units of measurement |
Silicides |
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|
Steatite |
Cordierite |
Mullite |
|||
|
Colour |
|
|
Серый |
Бежевый |
Серый |
|
Volumetric density |
|
г/см3 |
≥2,70 |
≥2 |
≥2,8 |
|
Water absorption |
— |
% |
0 |
≤1 |
10~15 |
|
|
|
|
|
|
|
|
Flexural strength |
|
МПа |
≥190 |
＞60 |
170 |
|
Compressive strength |
|
МПа |
≥551 |
＞280 |
550 |
|
Modulus of elasticity |
|
ГПа |
|
|
|
|
Poisson 's Ratio |
|
|
|
|
|
|
Vickers Hardness |
HV5 |
ГПа |
800 |
＞800 |
750 |
|
Fracture toughness |
|
МПа∙м1/2 |
|
|
2 |
|
|
|
|
|
|
|
|
Coefficient of thermal expansion |
20-800 °C |
10-6 /°C |
7,7~8,0 |
1,1-1,8 |
5,3 |
|
Thermal conductivity |
— |
Вт/м∙K |
2,5 |
3,35~5,02 |
3,5 |
|
Heat shock resistance |
ΔT |
°C |
≥200 |
＞260 |
300 |
|
Maximum operating temperature |
|
°C |
1290 |
1350 |
1450 |
|
Dielectric constant |
1 МГц |
— |
5,8 |
6 |
6 |
|
Dielectric losses |
1 МГц |
∙10-4 |
|
|
|
|
Dielectric strength |
DC |
кВ/мм |
18 |
10 |
8 |
|
Volumetric resistance |
25 °C |
Ом∙см |
≥ 1013 |
≥ 1013 |
≥ 1014 |
|
|
|
|
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|
Thick film |
нет |
||||
|
Thin film |
|
|
да |
||
Application area
- various microelectronics products