Advanced Coatings on High Temperature Applications


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To suppress interdiffusion between the coating and alloy substrate in addition to ensuring slow oxide growth at very high temperatures advanced coatings were developed, and they were classified into four groups, (1) the diffusion barrier coating with a duplex layer structure, an inner σ−(Re-Cr-Ni) phase as a diffusion barrier and outer Ni aluminides as an aluminum reservoir formed on a Ni based superalloy, Hastelloy X, and Nb-based alloy. (2) the up-hill diffusion coating with a duplex layer structure, an inner TiAl2 + L12 and an outer β-NiAl formed on TiAl intermetallic and Ti-based heat resistant alloys by the Ni-plating followed by high Al-activity pack cementation. (3) the chemical barrier coating with a duplex layer structure, an inner* γ + β + Laves three phases mixture as a chemical diffusion barrier and an outer Al-rich γ-TiAl as an Al reservoir formed by the two step Cr / Al pack process. (4) the self-formed coating with the duplex structure, an inner α-Cr layer as a diffusion barrier and an outer β-NiAl as an Al-reservoir on Ni-(2050)at% Cr alloy changed from the δ-Ni2Al3 coating during oxidation at high temperature. The oxidation properties of the coated alloys were investigated at temperatures between 1173 and 1573K in air for up to 1,000 hrs (10,000 hrs for the up-hill diffusion coating). In the diffusion barrier coating the Re-Cr-Ni alloy layer was stable, existing between the Ni-based superalloy (or Hastelloy X) and Ni aluminides containing 1250at%Al when oxidized at 1423K for up to 1800ks. It was found that the Re-Cr-Ni alloy layer acts as a diffusion barrier for both the inward diffusion of Al and outward diffusion of alloying elements in the alloy substrate. In the chemical barrier coating both the TiAl2 outermost and Al-rich γ-TiAl outer layers maintained high Al contents, forming a protective Al2O3 scale, and it seems that the inner, γ, β, Laves three phase mixture layer suppresses mutual diffusion between the alloy substrate and the outer/outermost layers.



Materials Science Forum (Volumes 522-523)

Edited by:

Shigeji Taniguchi, Toshio Maruyama, Masayuki Yoshiba, Nobuo Otsuka and Yuuzou Kawahara




T. Narita et al., "Advanced Coatings on High Temperature Applications ", Materials Science Forum, Vols. 522-523, pp. 1-14, 2006

Online since:

August 2006




[1] Brian Gleeson: Thermal Barrier Coatings for Aero-engine Applications, The AIAA Journal of Propulsion and Power, to be published in a special issue on Turbine Science and Technology (2006).

[2] S. Govindarajan, J. J. Moore, J. Disam, and C. Suryanarayana; Development of a Diffusion Barrier Layer for Silicon and Carbon in Molybdenum - a Physical Vapor Deposition Approach -, Metallurgical and Materials Transactions A, 30A(1999), 799-806.

DOI: 10.1007/s11661-999-0072-2

[3] M. Takahashi, Y. Ito, and M. Miyazaki; Thermal Barrier Coatings Design for Gas Turbines, Proceedings of ITSC'95, Kobe, (1995), 83-88.

[4] R. A. Page and G. R. Leverant; Inhibition of Interdiffusion From MCrAlY Overlay Coatings by Application of a Ni-Re Interlayer, J. of Engineering for Gas Turbines and Power, 121, (1999), 313-319.

DOI: 10.1115/1.2817122

[5] H. Hosoda, T. Kingetsu, and S. Hanada: DESIGN OF OXIDATION RESISTANT COATINGS BASED IN IrAl ALLOY, Proceedings of the 3 rd Pacific Rim Conference on Advanced Materials and Processing, edited by M. A. Imam, R. DeNale, S. Hanada, Z. Zhong, and D. N. Lee, TMS (1998).

[6] Toshio Narita, Mayumi Shoji, Yoshitake Hisamatsu, Daisuke Yoshida, Michihisa Fukumoto, and Shigenari Hayashi: Rhenium coating as a diffusion barrier on a nickel-based superalloy in high temperature oxidation, MATERIALS AT HIGH TEMPERATURES, 18(S), 245-251(2001).

[7] Yuzi Matsumura, Michihisa Fukumoto, Shigenari Hayashi, Akio Kasama, Isao Iwanaga, Ryohei Tanaka, and Toshio Narita : Oxidation Behavior of a Re-Base Diffusion-Barrier/β-NiAl Coating on Nb-5Mo-15W at High Temperatures�Oxidation of Metals�Vol. 61�Nos. 1/2�105-124(2004).

DOI: 10.1023/b:oxid.0000016279.88052.d9

[8] Toshio Narita, Shigenari Hayashi, Lang Fengqun, and Kemas Zaini Thosin The Role of Bond Coat in Advanced Thermal Barrier Coating�Materials Science Forum�Vol. 502, 99-104.

DOI: 10.4028/

[9] Takeshi Izumi, Takumi Nishimoto, and Toshio Narita: Formation of nickel aluminide coating on γ-TiAl alloy�Intermetallics�11�841-848.

DOI: 10.1016/s0966-9795(03)00083-9

[10] Takeshi Izumi, Takumi Nishimoto, and Toshio Narita : Formation and oxidation behavior of Ni2Al3 coating on heat-resistant Ti-alloy, Intermetallics�13�615-619 (2005).

DOI: 10.1016/j.intermet.2004.10.012

[11] Takeshi Izumi, Takumi Nishimoto, and Toshio Narita : Superior long-term oxidation resistance of Ni-Al coated TiAl alloys�Intermetallics, 13, 727-732 (2005).

DOI: 10.1016/j.intermet.2004.11.006

[12] Takumi Nishimoto, Takeshi Izumi, Shigenari Hayashi, and Toshio Narita : Effect of coating layer structures and surface treatments on the oxidation behavior of a Ti-50at. %Al alloy, Intermetallic, 11�459-466.

DOI: 10.1016/s0966-9795(03)00025-6

[13] Takumi Nishimoto, Takeshi Izumi, Shigenari Hayashi, and Toshio Narita : Two-step Cr and Al diffusion coating on TiAl at high temperatures�Intermetallics�11�225-235.

DOI: 10.1016/s0966-9795(02)00233-9

[14] Yoshimistu Shibata, Hidenori Takahashi, Manabu Noguchi, and Toshio Narita: EFFECT OF Zr ADDITIONS ON PROTECTIVE Al2O3 SCALE FORMATION OF β-NiAl/Ni-40at%Cr ALLOYS IN HIGH TEMPERATURE OXIDATION AT 1273K�High Temperature Materials Corrosion�Vol. 2004-16� 34-42(2004).

DOI: 10.4028/0-87849-409-x.369

[15] Daisuke Yoshida, Yoshimitsu Shibata, Shigenari Hayashi, and Toshio Narita: Changes of an Outer β−NiAl and Inner α-Cr Coating on Ni-40at%Cr Alloy during Oxidation at 1373K in Air, Oxidation of Metals, 64(1/2), 119-130(2005).

DOI: 10.1007/s11085-005-5717-y

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