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| FORM AND DISTRIBUTION OF Si IN Si-Al COATING TO K-3 ALLOY |
| by LI Yongzuo (Institute o! Aeronautical Materials; Beijing)(Manuscript received 20 April; 1983) |
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Cite this article:
by LI Yongzuo (Institute o! Aeronautical Materials; Beijing)(Manuscript received 20 April; 1983). FORM AND DISTRIBUTION OF Si IN Si-Al COATING TO K-3 ALLOY. Acta Metall Sin, 1984, 20(2): 166-175.
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Abstract Studies were made of the existing form and the distribution of Si in the Al-Si high temperature coating to K-3 alloy under the state of thermal permeation or static high temperature oxidation. It was found that the Si exists in the coating under the thermal permeation state mainly in the form of silieides, e.g., (Ni, Cr)_3 Si, (Mo,W, Ti)Si_2 and Ti_5Si_3, which dispersively distributes over the 40μm deep zone of the outer β-NiAl phase layer as small particles. While in the coating under static high temperature oxidation, not only its own phase structure but also the existing form and distribution of Si in it are changed. Two chief changed forms of Si are occurred as silicate at the surface and as solid solution in M_6C carbides phase in the interior of the coating. The Si-containing M_6C carbides form a barrier between the coating and the alloy substrate.
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Received: 18 February 1984
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1 Levine, S. R., NASA-TM-X-2370, (1971) .
2 Young, S. G.; Deadmore, D. L., NASA-TM-81455． , (1980) |
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