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Polished 4J29 Kovar alloy Bright Plate with ASTM F15
Kovar is A Nickel-Iron-Cobalt, controlled expansion alloy containing 29% Nickel. It’s coefficient of expansion (which decreases with rising temperature to the inflection point), matches the expansion rate of borosilicate glasses and aluminia ceramics. Applications include glass to metal seals in applications requiring high reliability or resistance to thermal shock, ie. high-power transmitting valves, transistor leads and heaters and photography flash bulbs.
Grade |
Chemical Composition (%) |
||||||||||
C |
P |
S |
Mn |
Si |
Cu |
Cr |
Mo |
Ni |
Co |
Fe |
|
≤ | |||||||||||
Kovar |
0.03 |
0.020 |
0.020 |
0.5 |
0.30 |
0.20 |
0.20 |
0.20 |
28.5~29.5 |
16.8~17.8 |
Balance |
Physical Property (see Table 2 & Table 3)
Table 2 Coefficient of Linear Expansion
Note: Kovar alloy is a Glass and Ceramic sealing alloy (Glass to metal sealing and Ceramic to metal sealing).
Grade |
Heat Treatment of the Samples |
Average Coefficient of Linear Expansion |
||
20~300℃ |
20~400℃ |
20~450°C |
||
|
Kovar |
Heat to temperature of 900±20℃ in the hydrogen, hold for 1h; re-heat to 1100±20℃, hold for 15 min.; cooled to 200℃ at a rate less than 5℃/min |
|
4.6~5.2 |
5.1~5.5 |
Table 3 Typical Coefficient of Linear Expansion
Grade |
Average Coefficient of Linear Expansion |
|||||||
20~200℃ |
20~300℃ |
20~400℃ |
20~450℃ |
20~500℃ |
20~600℃ |
20~700℃ |
20~800℃ |
|
Kovar |
5.9 |
5.3 |
5.1 |
5.3 |
6.2 |
7.8 |
9.2 |
10.2 |
Xi'an GangYan Special Alloy Co,Ltd. The factory is researching and producing precision alloy over 23 years , Worldwide Supply and 10000+ clients witness for you .
Our factory is located in Shaaxi Province of China. Our products are all made to satisfy the requirements of the European Union SGS --RoHs, ISO 9001 and we have both certification. Our advantages lie in strong research-and-development capabilities, abundant materials, highly cost performance, and relevant relations with the factories from all over the world. Also we can satisfy your unique requirements with ASTM, UNS, GOST, standards, For any Further INFO please feel free to contact us:webmaster@xagy.cn; Mary Skype: tianlulicheng2 .
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