1.Product description of alumina ceramic disc
Ceramic disc are used in many electronic applications where a thin insulating layer of thermally stable material is required to conduct heat away from electronic components whilst electrically insulating them, and material is 96% alumina, zirconia, silicon nitride and aluminum nitride, All our substrates are produced by laser cutting and surface grinding.
Properties with excellent insulation, high mechanical strength, high thermal conductivity, low expansion coefficient, small dielectric constant, high-temperature resistance, excellent erosion and wear resistance, good quality in chemical shock heat and cold.
All alumina ceramic disc could be customized according to your data requirements and drawings.
2. Features and advantage of alumina ceramic disc
1.Great mechanical strength
2.Low thermal conductivity
3.High heat resistance
4.High softening temperature
5.Small thermal expansion coefficient
6.Good cold-resistance heat-resistance
7.Resistance to acid and alkali corrosion
8.Long service life
alumina ceramic plate Chief technical parameters
3.Main Properties of alumina ceramic disc
| Property | Units | |
| Al2O3 Content | % | 96 | 98 | 99.5 | 99.7 |
| Density | g / cm3 | 3.70 | 3.80 | 3.90 | 3.92 |
| Color | - | White | White | Ivory | Ivory |
| Compressive Strength @ 25 C | Mpa | 2229 | 2091 | 2512 | 2350 |
| Tensile Strength @ 25 C | MPa | 200 | 200 | 248 | 252 |
| Flexural Strength @ 25 C | MPa | 331 | 276 | 324 | 320 |
| Elastic Modulus @ 25 C | GPa | 290 | 331 | 366 | 380 |
| Hardness : Knoop Rockwell | (Gpa) Kg/mm2
R45N | (11.7) 1196
79 | (12.5) 1276
77 | (14) 1428
85 | (15) 1510 90 |
| Thermal Conductivity @ 25 C | W / m-Deg K | 20.8 | 28.1 | 30.7 | 31.6 |
| Coefficient of Thermal Expansion @ 25-1000 C | 1 X 10-6 /
Deg C | 7.9 | 8.5 | 8.1 | 8.0 |
| Specific Heat @ 25 C | cal / g / Deg C | .184 | .184 | .182 | .180 |
| Maximum Working Temp. | Deg C | 1650 | 1650 | 1700 | 1700 |
| VolumeResitivity @25C @700 C | ohm-cm
ohm-cm | 1 X 10-13
1 X 10-8 | 1X 10-13
2.2 X 10-9 | 1 X 10-13
6 x 10-7 | 1 X 10-13
6 x 10-7 |
Dielectric Strength
(@Thickness) 100Mils | ac volts
per mil | 350 |
340 | 335 | 330 |
Dielectric Constant 1Mhz
@25C | e' / eo | 8.6 | 9.4 | 9.7 | 10.0 |
Dissipation Factor 1 Mhz
@25C | Tan Delta | .0004 | .0003 | .0003 | .0002 |
4.Application of alumina ceramic disc
MGC: Machinable glass ceramic have the following applications:
a) Electrical or thermal insulator
b) Structural components
c) Semi-conductor processing
d) Electrical and opto-electronic equipment
e) Many other uses.
