Kovar® Metal-Alloy Supplier

About Kovar® Metal and Kovar® Alloys

Mae Kovar® yn aloi sy'n cynnwys 29% nicel, 17% cobalt, .2% silicon, .3% manganîs a 53.5% haearn. Mae Kovar® yn adnabyddus am ei gyfernod isel o ehangu thermol. Kovar is suitable for uses which require a matched expansion seal between metal and glass parts. Mae defnyddiau terfynol Kovar® fel arfer yn selio gwydr yn y diwydiant electroneg.

Kovar not only has thermal expansion similar to glass, but its nonlinear thermal expansion curve can often be made to match a glass, thus allowing the joint to tolerate a wide temperature range. Chemically, it bonds to glass via the intermediate oxide layer of nickel(II) oxide and cobalt(II) oxide; the proportion of iron oxide is low due to its reduction with cobalt. The bond strength is highly dependent on the oxide layer thickness and character. The presence of cobalt makes the oxide layer easier to melt and dissolve in the molten glass. A grey, grey-blue or grey-brown color indicates a good seal. A metallic color indicates lack of oxide, while black color indicates overly oxidized metal, in both cases leading to a weak joint.

*Mae Kovar yn nod masnach cofrestredig CRS Holdings, Inc., yn is-gwmni i Carpenter Technology Corp.
*Pernifer 2918 is a registered trademark of ThyseenKrupp-VDM, Germany
*Dilvar P1 is a registered trademark of Imphy Alloys, Ffrainc
*NILO K is a registered trademark of Special Metals Corporation, USA

*Mae data uchod at ddibenion gwybodaeth yn unig. Nid yw Eagle Alloys yn atebol am gywirdeb y cynnwys neu'r cymwysiadau hyn. Gellir anfon lluniadau rhan gorffenedig at drydydd parti i'w rhoi ar gontract allanol.