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| High Temperature Performance of the Aluminium-silicon Coatings |
| Yang Zhonglin Mo Longsheng Cat Yulin Zheng Yunrong (Institute of Aeronatical Materials; Beijing; China) |
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Abstract The high temperature performance of the aluminium-silicon coated nickelbase superalloy K3 has been studied by static high-temperature oxidation test, hot-corrosion test and many physical analysis methods. The form of silicon distribution in the coating and its change during high-temperature exposure are revealed. The protective properties of the Al-Si coatings are evidently superior to aluminized coating and increase with silicon content for the following reasons. (a) The occurrence of "MC carbide notch" is diminished or prevented in Al-Si coatings. (b) The silicon-containing γ'-phases have a superior oxidation resistance. (c) A continuous Si-rich M(?)C "partition" formed at the interface between Al-Si coating and substrate after a short-time exposure at 1100℃ acts as a diffusion barrier.
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Received: 25 August 1981
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[1] G. V. Zemskov, etc, Effect of Silicon Additions on the Oxidation Resistance of Aluminized Layers on a Nickel-Chromium Alloy. Protective Coatings on Metals, Vol. 4, (1972)
[2] V. S. Moore, W. D. Brentnall, and A. R. Stetson, Evaluation of Coatings for Cobalt-and Nickel-Base Superalloys. NASA CR-72714． N72-18579, (1970)
[4] B. J. Piearcey, and R. W. Smashey,Trans. AIME,Vol.239, 451 (1967)
[5] G. Preis, und G Lennartz,Arch. Eisenhutenwesen, Vol. 46 S.589 (1975)
[6] G. J. Santoro, etc, Oxidation of Alloys in Nickel-Aluminum System with Third-Element Additions of Chromium, Silicon, and Titanium at 1100℃. NASA TND-6414
[7] M. A. Gedwill, Cyclic Oxidation Resistance of Clad IN-100 at 1040° and 1090℃: Time、Cyclie Frequency, and clad Thickness Effects. NASA TND-6276 (1971) |
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