발간논문

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Vol.36, No.11, 1813 ~ 1823, 1998
Title
Formation of Ni-Cr-Al Coating and Concentration Control of Cr and Al Codeposited by Pack Cementation Process
윤진국 , 유재은 , 맹선재 , 김재수 , 최종술 Jin Kook Yoon , Jae Eun Yoo , Sun Jae Maeng , Jae Soo Kim , Chong Sool Choi
Abstract
The codeposition of Cr and Al into Ni substrate has been achieved using the single-step pack cementation process. The effect of activators, temperature and the activity of Cr and Al in the Cr-Al masteralloys on the formation of Ni-Cr-Al coatings and concentration control of Cr and Al was investigated in an argon atmosphere at 1273K and 1373K. The coatings consisted of an outward-grown β-NiAl layer in which Cr was dissolved except for the coating formed by 5wt%Al-1273K coating condition where Cr and Al dissolved in Ni substrate. Aluminide coatings grown outwards in pack powders were embedded with Al₂O₃ and masteralloy particles and Kirkendall voids were formed in Ni beneath the coating-substrate interface. A masteralloy of high Cr/Al activity ratio, low coating temperature and less stable activator are essential for codeposition of Cr-Al and provision of microstructures and composition which promise good oxidation/corrosion resistance to Ni-Cr-Al coatings.
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