ovar Expansion Precision Alloy Ni29Co18 Uns K94610 (4J29)
Product Description
OhmAlloy-4J29 (Expansion alloy)
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)
Shanghai Tankii Alloy Material Co., Ltd. Focus on the production of
resistance alloy(nichrome Alloy, FeCrAl Alloy, copper nickel alloy,
thermocouple wire, precision alloy and thermal spray alloy in the
form of wire, sheet, tape, strip, rod and plate. We've already got
ISO9001 quality system certificate and approval of ISO14001
environmental protection system. We own a complete set of advanced
production flow of refining, cold reduction, drawing and heat
treating etc. We also proudly have independent R&D capacity.
Shanghai Tankii Alloy Material Co., Ltd has accumulated lots of
experiences over 35 years in this field. During these years, more
than 60 management elites and high science and technology talents
were employed. They participated in every walk of the company life,
which make our company keep blooming and invincible in the
competitive market. Based on the principle of "first quality,
sincere service", our managing ideology is pursuing technology
innovation and creating the top brand in the alloy field. We
persist in Quality - the foundation of the survival. It is our
forever ideology to serve you with full heart and soul. We
committed to provide customers all over the world with
high-quality, competitive products and perfect service.
Our products, such us nichrome alloy, precision alloy, thermocouple
wire, fecral alloy, copper nickel alloy, thermal spray alloy have
been exported to over 60 countries in the world. We are willing to
establish strong and long-time partnership with our customers. Most
complete range of products dedicated to Resistance, Thermocouple
and Furnace manufacturers Quality with end to end production
control Technical support and Customer Service.
