Incoloy 907 / 909(Ni – Co – Nb)

1. Introduce – Ni – Co – Nb alloys with high Co content – Alloys designed to overcome the limitations of Invar alloys (Addition of Co to Ni – Fe alloy → increase in curie temperature → decrease in high temperature coefficient of thermal expansion of the alloy) – No Cr added, resulting in low coefficient of thermal expansion and susceptibility to oxidation in high temperature environments – Difference between Incoloy 907 and Incoloy 909 : Si content (Incoloy 907 has about 0.25% less Si than 909) – Incoloy 909 : Alloy designed to overcome the limit...