What is Kovar Plates? Properties, Uses and Composition

What is Kovar Plates? Properties, Uses and Composition

Kovar, a nickel-cobalt ferrous alloy, has been popular in the manufacturing industry for many years. Kovar plates, in particular, have proven highly beneficial for various applications. These include applications in industries such as electronics, aerospace, and telecommunications. This article will delve further into the properties, composition, and uses of Kovar plates.

What is Kovar Plates?

Kovar plates are high-performance alloys specifically designed to have superb thermal expansion properties. This unique material comprises iron, Nickel and cobalt, making it extremely durable and corrosion-resistant. Its thermal expansion coefficient closely matches that of borosilicate glass, making it an ideal material for electronic devices such as integrated circuits and hermetic seals.

Not only do Kovar plates possess impressive mechanical strength, but they also have low magnetic permeability, which makes them perfect for sensitive electronic applications where electromagnetic interference must be minimized. This quality has made Kovar plates a staple in the aerospace industry, as well as in telecommunications and medical equipment.

One notable advantage of using Kovar plates is their compatibility with various sealing methods, such as welding and compression bonding. This allows manufacturers to create complex designs without worrying about compromising the structural integrity of their components.

Moreover, Kovar plates have excellent machinability, allowing for precise production and cost-effectiveness in manufacturing processes. With its versatility and reliability, this alloy has become the go-to choice for many industries seeking top-performing materials.

Composition of Kovar Plates

Kovar plates are alloys made up of Nickel, cobalt, and iron. The composition ratio of the three metals is Nickel (29%), cobalt (17%), and other elements (54%). The other elements in Kovar’s composition include manganese, silicon, and carbon. One of the reasons why Kovar is popular in various industries is its low coefficient of thermal expansion (CTE). This property makes it ideal for use in electronic devices, as it can withstand changes in temperature without damaging the device. Kovar’s CTE is also similar to borosilicate glass, which is why it is often used in creating glass-to-metal seals.

Properties of Kovar Plates

One of the unique properties of Kovar plates is their ability to withstand thermal shock. The thermal shock resistance of Kovar results from its low CTE, which makes it an excellent choice for use in harsh environments. Kovar plates also possess high tensile strength, low thermal conductivity, and oxidation resistance. These properties make Kovar plates ideal for high-performance applications like satellite electronics and space vehicles.

Uses of Kovar Plates

Kovar’s unique properties make it an ideal choice for various industry applications. In the aerospace industry, Kovar plates are used in temperature-sensitive applications. Kovar’s low CTE ensures it can withstand temperature changes without expanding, cracking, or contracting. Kovar plates also create less-to-metal seals in electronic devices such as microwaves, vacuums, and X-ray tubes. Kovar’s low thermal expansion coefficient helps ensure the glass-to-metal seals remain airtight as the glass and metal expand and contract at the same rate.

Other applications of Kovar plates include their use in telecommunications equipment, as Kovar’s low thermal conductivity makes it suitable for microwave relay systems and antennas. Kovar plates are also used to produce semiconductor packaging equipment and scientific research instruments.


In conclusion, Kovar plates are ferrous alloys with unique properties such as low CTE, high tensile strength, and thermal shock resistance. These properties make it ideal for various industries, such as aerospace, telecommunications, electronics, and research. Kovar plates’ low CTE makes them ideal materials for creating glass-to-metal seals in electronic devices, while their thermal shock resistance makes them valuable in manufacturing aerospace and space vehicle components. Kovar plates are one of the most versatile materials used in the manufacturing industry today.