TY - JOUR
T1 - High temperature characteristics of Ir-Ta coated and aluminized Ni-base single crystal superalloys
AU - Suzuki, A.
AU - Wu, F.
AU - Murakami, H.
AU - Imai, H.
N1 - Funding Information:
A part of this work was carried out under the auspices of Industrial Technology Research Grant Program and International Research Grant Program, JAPAN New Energy and Industrial Technology Development Organization (NEDO). The authors wish to thank Toshiba Co. Ltd for assisting Al pack cementation, Mr. K. Nishida for the EPMA analysis, Dr H. Katayama for impedance measurements. The authors are also grateful to Drs H. Harada and P. Kuppusami, Mrs. T. Yokokawa, Y. Koizumi, T. Kobayashi and M. Sato for their assistance and helpful discussions for conducting this study.
PY - 2004/9
Y1 - 2004/9
N2 - High temperature oxidation and .hot corrosion properties of Ir-Ta coated and aluminized Ni-base superalloys are presented. An Ir-Ta binary alloy, proposed as a novel metallic bond coat material, was coated on a Ni-base single crystal superalloy TMS-75 using electron beam physical vapor deposition, followed by a conventional low activity Al pack cementation process. Cyclic oxidation tests and hot corrosion tests revealed that these Ir-Ta coated and aluminized specimens showed reasonably good oxidation and hot corrosion resistance. In addition, it was found that the formation of TCP phases is suppressed by the presence of the Ir-Ta enriched layer. These results indicated that the Ir-Ta alloy system is promising as a new metallic bond coat material for high temperature structural materials.
AB - High temperature oxidation and .hot corrosion properties of Ir-Ta coated and aluminized Ni-base superalloys are presented. An Ir-Ta binary alloy, proposed as a novel metallic bond coat material, was coated on a Ni-base single crystal superalloy TMS-75 using electron beam physical vapor deposition, followed by a conventional low activity Al pack cementation process. Cyclic oxidation tests and hot corrosion tests revealed that these Ir-Ta coated and aluminized specimens showed reasonably good oxidation and hot corrosion resistance. In addition, it was found that the formation of TCP phases is suppressed by the presence of the Ir-Ta enriched layer. These results indicated that the Ir-Ta alloy system is promising as a new metallic bond coat material for high temperature structural materials.
KW - Diffusion barrier
KW - EB-PVD
KW - Ir-Ta coating
KW - Low activity Al pack cementation process
KW - Ni-base single-crystal superalloy
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U2 - 10.1016/j.stam.2004.03.004
DO - 10.1016/j.stam.2004.03.004
M3 - Article
AN - SCOPUS:9644266793
SN - 1468-6996
VL - 5
SP - 555
EP - 564
JO - Science and Technology of Advanced Materials
JF - Science and Technology of Advanced Materials
IS - 5-6
ER -