Improved Thermal Matching of Materials for Hermetic Optical Windows

A family of iron-nickel and ironnickel- cobalt alloys made using metal injection technology (MIT) has been designed to match the coefficient of thermal expansion (CTE) of select optical glass materials more closely than commonly available wrought alloys of similar composition. Using these glass and metal combinations, custom windows can be developed with improved optical properties, greater hermeticity levels, and lower residual stress.