Alumina
Technical Properties
Material:
| Ceramic (AI2O3) | White | ELECTRICAL | |
| Alumina Composition: | 94% | Dielectric Constant(1M.C.25˚C) | 9.4 |
| Bulk Density G/CC: | 3.65 | ||
| PHYSICAL | Dielectric Loss Angle(1Mhz) | 3(x10-4) | |
| Water Absorption: | None | ||
| Surface Finish: | 40 Microns(as fired) | Dielectric Strength | 10(KV/MM) |
| Loss Factor | 28.5(x10-4) | ||
| Micro Structure: | 15 Micronsavg. | VolumeResistivity | >1014ΩCM |
| 1013 ΩCM | |||
| Hermeticity: | 1 x 10-8ATMCC/Sec. | 1010 ΩCM | |
| Dissipation Factor | 0.001 | ||
Metalized BeO Substrates
TECHNICAL SPECIFICATIONS:
| Property | Value | |
| Thermal | Coefficient ofthermal expansion
Conductivity |
(25-1000 C)9.0 x 10-6
@25C 0.60 @100C 0.45 @150C 0.35 Cal./(cm sec. C) min.
|
| Electrical | Specific heat
Dielectric Constant
Dissipation Factor
Resistivity
Dielectric Strength |
0.25 cal./(gm C)
@1MHz 6.5 @10 GHz 6.7
@1 MHz 0.0004 max @10 GHz 0.004 max
1015 ohm-cm
25” thick 240V/mil |
| PhysicalMechanical | Hardness
Modulus of Elasticity
Poisson’s Ratio
Tensile Strength
Compressive Strength
Gas-Impenetrability
Surface Finish
Grain Size
Flexural Strength |
Rockwell 45N 60min
60 x 106 psi
0.26
22.000 psi
225,000 psi
10-8 oc/sec. helium
15 micro inch CLA maximum
9-16 microns (surface)
35,000 psi average |
BeO
SIZES:
| STANDARD SIZES: | CUSTOM SIZES: |
| 0.250 Square0.400 Square
0.500 Round 0.220 Round .400 x .500 .300 x .320 These are just a sample of the many standard sizes available. |
A host of custom configurations are available along with 2”x 2” matrices. |
Plating Type
- Nickel
- Mid Phosphorous – Electro less
- Low Phosphorous – Electro less
- Sulfamate – Electrolytic
- Boron – Electro less
- Gold
- 4-9’s pure
- 5-9’s pure
- Silver
Glass Type
- Fusite
- 72 High Strength
- Fusite T
- Proprietary High Strength
Ceramics
- Alumina
- BeO
- AIN
Metal Schemes
- Tungsten
- Moly/ Mag
Brazing Alloy
- Silver
- Silver/Copper