Precision Kovar Machining Services

Kovar is a nickel-iron-cobalt alloy specifically designed for its low thermal expansion coefficient. It contains approximately 53.5% iron, 29% nickel, and 17% cobalt, with the remaining 0.5% consisting of other elements. This unique composition gives Kovar exceptional dimensional stability across temperature variations, making it ideal for applications requiring precise thermal matching with certain glasses and ceramics.

No, Kovar is not stainless steel. While both are alloys, Kovar is specifically a nickel-iron-cobalt alloy designed for its low thermal expansion properties, whereas stainless steel is primarily an iron-chromium alloy designed for corrosion resistance. Kovar's unique composition and properties make it unsuitable for general corrosion resistance applications but excellent for precision applications requiring thermal stability.

The name 'Kovar' is derived from the combination of 'Ko' (from the German word 'Konstant' meaning constant) and 'var' (from 'Variation' meaning variation). This name reflects the alloy's key property of maintaining constant dimensions with minimal variation across temperature changes. The name was originally trademarked by Westinghouse Electric Corporation and has become the standard term for this type of low-expansion alloy.

Kovar is equivalent to several similar low-expansion alloys, including Nilo K (UK), Dilver P (Germany), and Rodar (Sweden). These alloys share similar compositions and thermal expansion characteristics. In some applications, Invar (Fe-36%Ni) can be considered as an alternative, though it has different thermal expansion properties. The choice between these materials depends on specific application requirements and thermal expansion matching needs.

Yes, Kovar can be machined, but it requires specialized techniques due to its tendency to work-harden during processing. Successful Kovar machining requires careful selection of cutting tools, optimized cutting speeds and feeds, proper coolant application, and heat management strategies. Our advanced CNC capabilities and specialized tooling enable us to machine Kovar components with high precision while maintaining tight tolerances and excellent surface finishes.