Iron Nickel Cobalt Alloy Kovar bright wire

Model NO.: Kovar


Material: Fe-Ni-Co


surface: bright or black


Trademark: ToLand Alloy


Origin: China




Product Type: Wire


Carbon Content: Low Carbon


length: random, fixed


Specification: 6-300mm


Description:



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.



Application:

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.



Physical Constants:

Density:8.17g/cm³

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)

0.155 (430ºC)

Heat conductivity(calorie/cm· Sec. · ºC): 0.0395 (30ºC)

0.0485(300ºC)

Curie temperature (ºC): 435

γ α Phase-transition temperature(ºC): Below -80



Electrical performance:

Resistivity (μ Ω -mm): 49 (25ºC)

Varieties		Steel type Specifications mm	Precision alloy	Resistance Alloys for electrical heating	Super alloy	Welding Wire	Corrosion resistant alloy
Rods	hot rolling rods	Φ8~38mm	available		available		available
	Cold-drawn rods	≤50mm	available		available		available
	Forged rods	Φ38~350mm	available		available		available
Wires	Round wires	Φ0.3~8mm	available	available	available	available	available
	Non-circle wires	Negotiation	available		available		available
Strips	Cold rolling	0.15~4×200mm	available	available	available		available
	Hot rolling	4~22×200mm	available	available	available		available
Plates	Cold rolling	0.5~4×1000×2000mm	available		available		available
	Hot rolling	4~22×1000×2000mm	available		available		available
tubes		Φ4~63×0.5~5mm			available		available
Executive standard: GB, GJB, HB, YB, ASTM, AMSE, negotiation and so on.

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Product Categories : Precision Alloy