PURPOSE: To obtain high strength at high temp. and to stably use a composite over a long period by providing refractory metal fiber coated with Nb layer and Nb-Al alloy layer into a matrix composed of super alloy of Fe base, Ni base, etc.
CONSTITUTION: A beat resisting composite is formed by providing refractory metal fiber into a matrix composed of Fe-base, Ni-base, or Co-base super alloy. Refractory metal fiber composed of tungsten alloy, etc., and coated with Nb layer consisting of Nb or Nb alloy and further coated with Nb-Al alloy layer on the above Nb layer are used as the above refractory metal fiber. In this heat resisting composite, thermal deformation can be prevented even if repeated thermal load between high temp. and ordinary temp. is applied. Since the surface of the Nb layer is coated with the Nb-Al alloy layer, mutual diffusion between the super alloy as matrix and the refractory metal fiber at high temp. can be prevented and, as a result, deterioration in a reinforcement consisting of the above refractory metal fiber can be prevented.
SUZUKI TAKAO
OKUDE SHINICHIRO
NAKABASHI MASAKO
TAKEDA HIROMITSU
