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Kovar Companies and Suppliers

IQS Directory is a top industrial directory listing of leading industrial kovar compaines and suppliers. Access our comprehensive index to review and source kovar suppliers with preview ads and detailed product descriptions. These kovar companies can design, engineer and supply kovars to your specifications and application need. A quick and easy to use request for quote form is provided for you to contact these kovar companies and suppliers. Each company has detailed profile information, locations, phone number, website links, product videos and product information defined. Read customer reviews and product specific news articles. We are the right resource for your information requirement whether its for a supplier of kovar steel plates, kovar welding, kovar tubings.

  • Islandia, NY

    Being a metal service center with an emphasis in supplying nickel, we have in-stock nickel sheet, nickel flat bar, nickel plate, nickel round bar, sheet and tube forms. We service nickel for aerospace, industrial and military applications. All grades and forms are available and ready for fast shipment and at competitive pricing.

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  • Strongsville, OH

    Fay Industries carries a broad range of stock metals, including stainless steel, aluminum, copper, nickel and several alloys in bar, plate, pipe and tube. With a full line of metal servicing plus value-added services, we can meet your custom size requirements, alloy requirements and more. Proudly serving industry since 1974.

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  • Mississauga, ON

    Russel Metals is one of North America’s leading distributors and processors of metals. We have a number of comprehensive metal service centers across the continent where we supply metal plates, bars, sheets, coils, tubes and pipes out of aluminum, red metals, nickel, stainless steel, and specialty alloys. Our competitive prices, quality products and timeliness make us your number one metal source.

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  • Bolingbrook, IL

    Nickel alloy, nickel bar, nickel plate, buttweld fittings, 3,000-lb. fittings, pipe plugs, reducing bushings, flanges, pipe, rod, sheet and tubing are available through us. Nickel-molybdenum, nickel-chromium-molybdenum, nickel-copper, iron-nickel-chromium, and nickel-chromium available in various forms too. Call now to avail yourself of our standard-setting product quality and service.

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Kovar Industry Information

Kovar

Also known as Rodar, Kovar is a registered trademark that refers to a low expansion alloy that is composed of iron, nickel, cobalt, and trace amounts of the elements manganese, silicone, and carbon. Kovar was specifically formulated as a sealing alloy for glass and ceramic materials (specifically for compatibility with the thermal expansion characteristics of borosilicate glass).

Quick links to Kovar Information

Applications of Kovar

The material is used by many industries, including electronics, medical, semiconductor and industrial manufacturing, to provide exceptional hermetic seals for applications such as power tubes, vacuum tubes, transistors, microwave tubes, diodes, integrated circuits, and x-ray tubes.

Characteristics of Kovar

Most often used in applications requiring a glass to metal seal, Kovar is vacuum melted, meaning that it has undergone melting, refining, and casting under a vacuum. An additional property of Kovar is that, at any temperature under that of the Curie point (435°C or 815ºF), it is magnetic. Kovar is similar to another nickel alloy, referred to as Invar. Invar is a nickel steel alloy with specific thermal expansion properties; however, Invar is unique for its low thermal expansion qualities, while Kovar is unique for its low thermal expansion in terms of its compatibility to heat-resistant glass.

Material Properties of Kovar

Kovar is specifically composed of 54% iron, 29% nickel, 17% cobalt, .2% silicon, .3% manganese, and less than .01% carbon. This chemical composition has narrow limits that are controlled to ensure optimal thermal expansion compatibility.

Kovar Design and Customization

Kovar can be fabricated into shapes and parts such as sheets, rods, plates, bars, and tubing through a variety of heat treating processes, including annealing and forging. Although high temperatures are not critical when annealing Kovar, temperatures greater than 900ºC (1652ºF) are not recommended because the high heat will promote grain growth. When it comes to forging Kovar, the biggest concern is that the Kovar must be heated quickly to avoid soaking within the furnace, which can affect the surface appearance of the alloy.

In addition to manufacturing processes, there are many types of secondary services that are commonly used on Kovar including turning, drilling, tapping, and reaming. When it comes to turning Kovar, it is necessary to pay attention to the angle of the cutting tools. For drilling Kovar, it is the speed of the drill and the resulting feed that must be taken into consideration. It is the same for reaming but with different required proportions. Lastly, when it comes to tapping Kovar, the speed should be around 20 feet per minute (FPM), and it is recommended to use either nitrided or electrolyzed tools.



Kovar Informational Video


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