Kovar® Metal-Alloy Supplier

About Kovar® Metal and Kovar® Alloys

Kovar® is an alloy made up of 29% nika, 17% cobalt, .2% hiraka, .3% manganese me 53.5% rino. 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. Ko nga whakamahinga mutunga o Kovar® ko te hiri karaihe i roto i te umanga hiko.

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 he tohu rehita o CRS Holdings, Inc., he apiti o Carpenter Technology Corp.
*Pernifer 2918 is a registered trademark of ThyseenKrupp-VDM, Tiamana
*Dilvar P1 is a registered trademark of Imphy Alloys, Parani
*NILO K is a registered trademark of Special Metals Corporation, USA

*Kei runga ake nei nga korero mo nga korero noa iho. Kaore e tika te kawenga a te Eagle Alloys mo te tika o enei tuhinga, tono ranei. Ko nga tuhinga waahanga kua oti ka tukuna pea ki tetahi atu tuatoru mo te tuku ki waho.