China Factory Price 4j29 / Kovar Strip Expansion Sealing Alloy
Classification : the alloy of expansion characteristics
Application: Kovar (trademark of CRS Holdings, inc., Delaware[1]) is a nickel-cobalt ferrous alloy compositionally identical to Fernico 1, designed to be compatible with the thermal expansion characteristics of borosilicate glass (~5 × 10?6 /K between 30 and 200 °C, to ~10 × 10?6 /K at 800 °C) in order to allow direct mechanical connections over a range of temperatures. It finds application in electroplated conductors entering glass envelopes of electronic parts such as vacuum tubes (valves), X-ray and microwave tubes and some lightbulbs.
Chemical Composition in % 4j29 / Kovar
| Chemical composition |
| C | P | S | Mn | Si | Ni | Cr | Mo | Cu | Co | Fe |
| ≤ |
| 0.03 | 0.02 | 0.02 | ≤0.5 | ≤0.3 | 28.5~29.5 | ≤0.2 | ≤0.2 | ≤0.2 | 16.8~17.8 | Bal. |
The Mechanical properties of 4j29 / Kovar
| Mechanical properties |
Коэффициент линейного
расширения | Удельное
электросопротивление | Плотность | Точка
Кюри | Модуль упругости | Теплопроводность |
| Coefficient of linear expansion | Electrical resistivity | Density | Curie point | Elastic Modulus |
Thermal conductivity |
| α1(20~200℃)/10-6℃-1 | ρ/(μΩ*m) | ρ/(g/cm3) | Tc/ ℃ | E/ Gpa | λ/ W/(m*℃) |
| 4.6~5.2 | 0.48 | 8.2 | 430 | 138 | 20.6(100℃) |
The name Kovar is often used as a general term for Fe-Ni alloys with these particular thermal expansion properties. Note the related particular Fe-Ni alloy Invar which exhibits minimum thermal expansion.
TANKII, referring to the presence of high-power production, offers customers buy alloy Kovar in the required quantities and ensures minimum time shipments of rolled metal products, made on the basis of Kovar.
If you have any questions, pls give us message to zlz@tankii.com
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China Factory Price 4j29 / Kovar Strip Expansion Sealing Alloy Images
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