NEGATIVE THERMAL EXPANSION COMPRESSOR CASE FOR IMPROVED TIP CLEARANCE

A compressor (61) with negative coefficient of thermal expansion case material (50) comprising a rotor having blades with tips (76), the case including an inner case (62) comprising a negative coefficient of thermal expansion material (50), and a tip clearance (74) located between the tips (76) and the inner case (62); wherein the tip clearance (74) is maintained responsive to a flow of air (70) over the negative coefficient of thermal expansion material (50).