Model No.: Kovar
Model NO.: Kovar
surface: bright or black
Trademark: ToLand Alloy
Product Type: Wire
Carbon Content: Low Carbon
length: random, fixed
4J29(China); 29H, 29H-B, Techallony(Russia); Kovar, Rodar, Glasseal 29-17(United States); Nilo K, Telcaseal(Great Britain); KV-1, KV-2, KV-3(Japan); Dilver P0, Dilver P1(France); Vacon 12, Silvar 48(Germany).
4J29 expansion alloy, also known as Kovar alloy, is a Nickel Iron alloy with 29% Nickel, 17% Cobalt and the remaining balance is Iron. The expansion characteristics of Kovar match both borosilicate (or Pyrex) glasses and alumina ceramics, making it one of the most popular controlled expansion alloys for hermetic sealing applications. Kovar is produced to ensure good properties for machining and deep drawing, and is a porosity free product. You'll find Kovar in applications such as power tubes, microwave tubes, transistors, diodes, hybrid packages, and other kinds of scientific instruments.
The alloy is widely used as glass sealing for electronic vacuum devices, such as launching tube, oscillating tube, ignitron, magnetron, transistor, sealing plug, relay, leading wire of integrated circuit, chassis, shell, scaffold and so on.
Specific gravity (g/cm3): 8.36
Melting point(ºC): 1450
Melting heat(calorie/g): 64
Vapour pressure (μ M): 1× 10-6 (1000ºC)
Specific heat(calorie/g/ºC): 0.105 (0ºC)
Heat conductivity(calorie/cm· Sec. · ºC): 0.0395 (30ºC)
Curie temperature (ºC): 435
γ α Phase-transition temperature(ºC): Below -80
Resistivity (μ Ω -mm): 49 (25ºC)
|Varieties|| Steel type |
| Precision |
|Resistance Alloys for electrical heating||Super alloy||Welding Wire|| Corrosion resistant |
|Rods||hot rolling rods||Φ8~38mm||available||available||available|
|Executive standard: GB, GJB, HB, YB, ASTM, AMSE, negotiation and so on.|
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