Kovar® Metal-Alloy Supplier

About Kovar® Metal and Kovar® Alloys

Ko Kovar® ko ha alloy ia ʻoku faʻu ʻaki e 29% seniti ʻe nima, 17% cobalt, .2% Silikoni, .3% manganese mo e 53.5% ukamea. ʻOku ʻiloa ʻa e Kovar® ʻi hono tuʻunga maʻulalo ʻo e mafola ʻa e thermal. Kovar is suitable for uses which require a matched expansion seal between metal and glass parts. Kovar® ngataʻanga ʻoku faʻa fakaʻaongaʻi ia ʻi he sila sioʻata ʻi he ngaahi ngaue fakaʻilekitulonika.

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.

*Ko kovar ko ha fakaʻilonga ia kuo lesisita ʻo e NGAAHI CRS Holdings, Inc., ko ha subsidiary ʻo e tekinolosia ʻa e tangata tufunga Corp.
*Pernifer 2918 is a registered trademark of ThyseenKrupp-VDM, Germany
*Dilvar P1 is a registered trademark of Imphy Alloys, Falanisē
*NILO K is a registered trademark of Special Metals Corporation, USA

*Ko e fakamatala ʻi ʻolunga ʻoku fekauʻaki ia mo e ngaahi taumuʻa pe. ʻOku ʻikai ke ʻekeʻi mei he Alloys ʻIkale ʻa e tonu ʻo e ngaahi meʻa ko ʻeni pe ngaahi polokalama fakaʻaongaʻi. ʻE lava ke ʻave ʻa e ngaahi ta fakatata fakaʻosi ki ha paati hono tolu ki he outsourcing.