| The
ceramic made of 95% Al2O3 offers unique and amazingly powerful physical,
thermal and electrical properties that have opened up a whole new
world of development opportunities for manufacturers in a wide range
of industries. In general terms, advanced ceramics exhibit exceptional
properties that make them highly resistant to melting, bending, stretching,
corrosion or wear. Their hardness, physical stability, extreme heat
resistance, chemical inertness, biocompatibility, superior electrical
properties and, not least, their suitability for use in mass produced
products make them one of the most versatile groups of materials in
the world. |
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| Typical
products made by metallized ceramics |
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The most important
component to a quality ceramic-to-metal seal is the metal pattern
fired into the ceramic. This coating becomes the interface that bonds
the dissimilar materials together. Our process utilizes a special
moly-manganese material that is applied to the ceramic directly or
by a screen. This metalized coating is then bonded to the ceramic
by high-temperature firing in a suitable atmosphere. We then utilize
electrolytic nickel as our preferred deposition over the refractory
metallization. This results in a system that is easily brazed with
copper-silver, pure copper, and all alloys in between. Gold, copper,
and tin plating are available upon request. |
The ceramic materials used offer many important properties, including,
low dielectric loss, consistent dielectric constant, high mechanical
strength and nil porosity. Our ability to metallise and braze to
produce sub-assemblies, allows our customers to concentrate on their
core competencies.
Applications:
Vacuum tube
Vacuum interrupter
Vacuum relay
Vacuum capacitor
Diodes
Thyristor
Gate turn-off (GTO) device
IGBT press pack housing
Substrate
Ceramic properties
| Volume
density: |
¨R
3.61g/cm3 |
| Helium
Leak rate: |
¨Q1x10-11
pa.m2/s |
| Yield strength: |
¨R290
Mpa |
| Dielectric
constant, 1MHz 20¡æ/500¡æ: |
9~10 |
| Dissipation
factor, 1MHz 20¡æ |
¨Q2.5¡Á10-4 |
Dissipation factor, 1MHz 500¡æ |
30~40 |
| Dielectric
strength: |
¨R30 D.C
KV/mm |
| Acid fastness,
1:9HCL: |
¨Q5.0 mg/cm2
|
| Alkali
fastness 10%NaOH: |
¨Q0.15
mg/cm2 |
| Heating
test: Heated to 800¡æ for 30 minutes and naturally cooled to
room temperature, repeating 10 times: |
No crack |
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Equipments
on our production line |
VFS
Hydrogen Furnace |
High
temperature electric kiln |
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CNC
metal sealing tensile tester |
Metallization
thickness tester |
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| High
temp. CNC hydrogen furnace |
Projection
machine |
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Beijing
Phamitech Electronics Company Limited
27 Zengguang Road, Beijing 100037, China
Tel: +86 10 68730450, Fax: +86 10 68470948,
Email :sales@phamitech.com
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