Kovar® Metal-Alloy Supplier

About Kovar® Metal and Kovar® Alloys

Kovar® is an alloy made up of 29% निकल, 17% कोबाल्ट, .2% सिलिकॉन, .3% मैंगनीज और 53.5% लोहा. Kovar® अपने थर्मल विस्तार के कम गुणांक के लिए जाना जाता है. Kovar is suitable for uses which require a matched expansion seal between metal and glass parts. Kovar® अंत का उपयोग करता है आम तौर पर गिलास इलेक्ट्रॉनिक्स उद्योग में सील कर रहे हैं.

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 is a registered trademark of CRS Holdings, Inc., a subsidiary of Carpenter Technology Corp.
*पेनिफ़र 2918 is a registered trademark of ThyseenKrupp-VDM, जर्मनी
*Dilvar P1 is a registered trademark of Imphy Alloys, फ्रांस
*NILO K is a registered trademark of Special Metals Corporation, अमेरीका

*केवल सूचना के प्रयोजनों के लिए डेटा के ऊपर है. ईगल मिश्र इन सामग्री या अनुप्रयोगों की सटीकता के लिए उत्तरदायी नहीं है. समाप्त भाग चित्र आउटसोर्सिंग के लिए एक तीसरी पार्टी के लिए भेजा जा सकता है.