Ni-ALLOY HEAT-RESISTANT MATERIAL WITH EXCELLENT HIGH- TEMPERATURE OXIDATION RESISTANCE

Japanese Patent JP3916484

B2

PROBLEM TO BE SOLVED: To provide a material in which high-temperature corrosion and abnormal oxidation can be suppressed and excellent high-temperature characteristics inherent in Ni alloys can be maintained over a long period of time and which is suitable for high-temperature use such as gas turbine, jet engine, and exhaust gas member.
SOLUTION: In the Ni-alloy heat-resistant material with excellent high- temperature corrosion resistance, an Al-diffusion-treated Ni-alloy basis material is used and a surface layer which has a double-layer structure consisting of an inner layer composed of αCr-phase and an outer layer composed of β-phase (Ni-Al-Cr) and γ'-phase (Ni3Al(Cr)) is formed on the surface of the basis material, and Al concentration in the outer layer is made to ≥20 atomic %. The αCr-phase functions as a diffusion barrier layer. By forming the outer layer increased in Al concentration, high Al concentration necessary for applying self-repair to the defective part of an Al2O3 film damaged under service conditions can be secured in the outer layer, and high-temperature characteristics inherent in Ni alloys can be maintained over a long period of time.

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Toshio Narita
Daisuke Yoshida

JP2002059547A

May 16, 2007

March 05, 2002

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Japan Science and Technology Agency

C23C28/02; C22C19/03; C22C19/05; C23C10/02; C23C10/48; C23C10/60; (IPC1-7): C23C28/02; C22C19/03; C22C19/05

JP10130863A
JP60159163A
JP2001355081A

Yoshiyuki Nishi

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