C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 19/03 (2006.01) C22C 19/05 (2006.01) C23C 14/16 (2006.01) C23C 26/00 (2006.01) C30B 11/00 (2006.01) C30B 33/00 (2006.01) C23C 14/58 (2006.01)
Patent
CA 2301092
A Ni-based single crystal alloy having a coating film for preventing recrystallization fracture being capable of preventing the intergranular fracture resulting from recrystallization, which comprises a Ni-based single crystal alloy containing none or a trace amount of a grain boundary- reinforcing metal and, coated on the surface thereof, a coating film of a Ni- based alloy containing at least one of the grain boundary-reinforcing elements composed of the group consisting of Zr, Hf, B and C, wherein the above grain boundary-reinforcing element is dispersed only on the surface of the above Ni- based single crystal alloy by a heat treatment of the coating film at a temperature which does not cause the recrystallization of the Ni-based single crystal alloy.
Alliage monocristallin à base de Ni, doté d'un film de revêtement permettant d'empêcher la cassure de recristallisation et capable d'empêcher la cassure intergranulaire résultant de la recristallisation. Ledit alliage ne comporte pas de métal renforçant la limite de grain ou n'en comporte qu'une quantité à l'état de trace, et comporte, sur sa surface, un film de revêtement en alliage à base de Ni contenant au moins un des éléments renforçant la limite de grain choisi dans le groupe constitué de Zr, Hf, B et C. Ledit élément renforçant la limite de grain est dispersé uniquement sur la surface de l'alliage monocristallin à base de Ni par traitement thermique du film de revêtement à une température qui ne provoque pas la recristallisation de l'alliage monocristallin à base de Ni.
Mitsubishi Heavy Industries Ltd.
Sim & Mcburney
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