small in coefficient of thermal expansion. Conventionally, the metallic holders are made of iron-nickel-cobalt alloy and several sort Although the manufacturer makes the metallic holders of the alloy small in t
small in coefficient of thermal expansion. Conventionally, the metallic holders are made of iron-nickel-cobalt alloy and several sorts of stainless steel. The iron-nickel-cobalt alloy is called by its trade name “Kovar”, and the stainless steel is, by way of example, SUS304, SUS316 and ...