Super Alloys K94610 Kovar Bar ASTM F15 Thermal Expansion
Super Alloys K94610 KOVAR Bar ASTM F15 Thermal Expansion
KOVAR Bar is also called sealing alloy or constant expansion alloy. The alloy has a linear expansion coefficient similar to that of borosilicate hard glass at 20~450 ℃, a high Curie point and good low temperature structural stability. The oxide film of the alloy is dense and can be well soaked by glass. It does not interact with mercury and is suitable for use in mercury containing discharge instruments. It is the main sealing structural material of electric vacuum devices.
Chemical Composition of KOVAR Bar
| Chemical Compositions | |
| Element | Content |
| NICKEL (Ni) | 29 |
| COBALT (Co) | 17 |
| MANGANESE(Mn) | 0.5 |
| SILICON (SI) | 0.2 |
| SULFUR (S) | 0.025 |
| CHROMIUM(Cr) | 0.2 |
| COPPER (Cu) | 0.2 |
| MOLYBDENUM (Mo) | 0.2 |
| ZIRCONIUM (Zr) | 0.1 |
| PHOSPHORUS (P) | 0.025 |
| CARBON (C) | 0.06 |
| IRON | BALANCE |
Product specifications of KOVAR Bar
- Density: 0.302 lbs./in3
- Specific Gravity: 8.36 g/cc
- Curie Temperature: 435o C / 815o F
- Melting Point: 1450o C / 2640o F
- Specific Heat: 0.105 cal/gm/ o C at 0o C & 0.155 cal/gm/ o C at 430o C
- Thermal Conductivity: 17.3 W/m ⋅ K
- Electrical Resistivity: 49 microhm/cm
KOVAR Bar picture:
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Application of Kovar Alloy Bar
It is used to make Fe-nickel-cobalt alloy strip, bar, plate and pipe with hard glass/ceramic matching sealing. It is mainly used in vacuum electronics, power electronics and other industries.
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