Kovar® Metal-Alloy Supplier

About Kovar® Metal and Kovar® Alloys

Kovar® is an alloy made up of 29% nikkel, 17% kóbalt, .2% kísill, .3% mangan og 53.5% járn. Kovar® is known for its low coefficient of thermal expansion. Kovar is suitable for uses which require a matched expansion seal between metal and glass parts. Lokanotkun Kovar® er venjulega glerþétting í rafeindaiðnaði.

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.

*Kovar er skráð vörumerki CRS Holdings, Inc., dótturfyrirtæki Carpenter Technology Corp.
*Pernifer 2918 is a registered trademark of ThyseenKrupp-VDM, Þýskalandi
*Dilvar P1 is a registered trademark of Imphy Alloys, Frakklandi
*NILO K is a registered trademark of Special Metals Corporation, Bandaríkin

*Ofangreind gögn eru eingöngu til upplýsinga. Eagle Alloys er ekki ábyrgt fyrir nákvæmni þessa innihalds eða forrita. Loka hlutateikningar má senda til þriðja aðila vegna útvistunar.