1.The properties of engineering ceramic components:
(1) Mechanical properties: Ceramic materials have the best stiffness and hardness among engineering materials, and their hardness is mostly above 1500HV. Ceramics have high compressive strength, but poor resistance and toughness.
(2) Thermal properties: Ceramic materials generally have a high melting point (mostly above 2000°C), and have excellent chemical stability at high temperatures; the thermal conductivity of ceramics is lower than that of gold-good thermal insulation materials. At the same time, the linear expansion coefficient of ceramics is lower than that of metals. When the temperature changes, ceramics have good dimensional stability.
(3) Electrical properties: most ceramics have good electrical insulation,
(4) Chemical properties: Ceramic materials are not easy to oxidize at high temperatures, and have good corrosion resistance to acids, alkalis and salts.
(5) Optical properties: ceramic materials also have unique optical properties.
2. The application areas of engineering ceramic components:
Engineering ceramic components have excellent strength, hardness, insulation, thermal conductivity, high temperature resistance, oxidation resistance, corrosion resistance, wear resistance, high temperature strength and other characteristics. Therefore, under very severe conditions, they can show Its high stability and excellent mechanical properties have attracted much attention in the material industry, and its application range is also expanding. The global and domestic industries have increasingly strict requirements for high-consumption, high-reliability mechanical components or electronic components, so the demand for ceramic products is highly valued, and its market growth rate is also considerable.
Engineering ceramic components processing range: ceramic bushings, ceramic bushings, ceramic rings, ceramic flanges, ceramic pump valves, ceramic tubes, ceramic nozzles, ceramic dispensing valves, food and medical ceramics, photovoltaic ceramic parts, etc., 600mm, involved More than 2700 specifications and more than 5700 varieties.
3. Typical properties for common materials of Alumina Ceramic:
|
ITEM |
Unit |
Al203 |
||||||
|
AS970 |
HA-96-2 |
HBS |
HRA |
HA-996 |
||||
|
Material |
- |
- |
96.5% |
96% |
96.5% |
96% |
99.6% |
|
|
Color |
- |
- |
White |
White |
White |
White |
White |
|
|
Density |
- |
g/㎤ |
3.74 |
3.75 |
3.75 |
3.60 |
3.90 |
|
|
Surface Roughness(Ra) |
- |
µm |
0.4 |
0.4 |
0.3 |
0.3 |
0.1 |
|
|
Luminous Reflectance |
0.3-0.4mmt |
% |
70 |
70 |
70 |
85 |
75 |
|
|
0.8-1.0mmt |
80 |
80 |
80 |
95 |
85 |
|||
|
Physical Property |
Breaking Strength |
Three-point bending |
MPa |
450 |
400 |
500 |
370 |
470 |
|
Modulus of Elasticity |
- |
GPa |
330 |
330 |
330 |
- |
330 |
|
|
Vickers Hardness |
- |
GPa |
14 |
14 |
14 |
- |
16 |
|
|
Fracture Toughness |
IF |
MPa･m1/2 |
3.0 |
3.0 |
- |
- |
- |
|
|
Thermal Property |
Thermal Expansivity |
40-400°C |
10-6/K |
6.7 |
6.7 |
6.7 |
6.7 |
6.8 |
|
40-800°C |
7.8 |
7.8 |
7.8 |
7.8 |
7.9 |
|||
|
Thermal Conductivity |
25°C |
W/(m･K) |
24 |
24 |
24 |
20 |
29 |
|
|
300°C |
12 |
12 |
12 |
- |
13 |
|||
|
Specific Heat |
25°C |
J/(㎏･K) |
750 |
750 |
750 |
750 |
780 |
|
|
Electric Property |
Dielectric Constant |
1MHz |
- |
9.8 |
9.8 |
9.8 |
- |
9.9 |
|
Dielectric Loss |
1MHz |
10-3 |
0.2 |
0.2 |
0.2 |
- |
0.05 |
|
|
Volume Resistance |
25°C |
Ω･㎝ |
>1014 |
>1014 |
>1014 |
>1014 |
>1014 |
|
|
Breakdown Voltage |
DC |
㎸/㎜ |
>15 |
>15 |
>15 |
>15 |
>15 |
|
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