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).
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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.