In this paper, a metallic protective coating is investigated as a diffusion barrier on the second generation single crystal superalloy DD6. A double layer of NiCoCrAlY/Ru coating is prepared by electroplating and electron beam physical vapor deposition (EB-PVD) on a sample of single crystal superalloy DD6. Also, a single NiCoCrAlY coating is deposited onto the single crystal superalloy by EB-PVD. The results show that an interdiffusion zone (IDZ) of ~55 μm and a secondary reaction zone (SRZ) of ~25 μm are formed in the superalloy after 300 h heat-treatment at 1 050 ℃ in atmospheric environment. Compared with the single NiCoCrAlY coating, the NiCoCrAlY/Ru coating effectively suppressed the formation of SRZ in the superalloy. There are only tiny amounts of topologically close-packed phases (TCP) precipitated in the superalloy.
WANG Juan, PENG Hui, CHEN Guozhong, GUO Hongbo, GONG Shengkai
. Impact of Ru Buffer Layer on Diffusion Behavior Between NiCoCrAlY and Single Crystal Superalloy DD6[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2011
, 32(4)
: 758
-764
.
DOI: CNKI:11-1929/V.20101110.1442.001
[1] Miller R A. Thermal barrier coatings for aircraft engines: history and directions [J]. Journal of Thermal Spray Technology, 1997, 6(1): 35-42.
[2] Rigney D V, Vigule V, Wortman D J. PVD thermal barrier coating applications and process development for aircraft engines [J]. Journal of Thermal Spray Technology, 1997, 6(2): 167-175.
[3] Padture N P, Gell M, Jordan E H. Thermal barrier coatings for gas-turbine applications [J]. Science, 2002, 296: 280-284.
[4] Stiger M J, Yanar N M, Topping M G. Thermal barrier coatings for the 21st century [J]. Materials Research and Advanced Techniques, 1999, 12: 1069-1087.
[5] 李美栓. 金属的高温腐蚀[M]. 北京: 冶金工业出版社, 2001: 420-431. Li Meishuan. High temperature corrosion of alloy[M]. Beijing: Metallurgical Industry Press, 2001: 420-431. (in Chinese)
[6] Brindley W J, Miller R A. Thermal barrier coating life and isothermal oxidation of low-pressure plasma-sprayed bond coat alloys [J]. Surface and Coatings Technology, 1990, 43(1-3): 446-457.
[7] Angenete J, Stiller K, Bakchinova E. Microstructural and microchemical development of simple and Pt-modified aluminide diffusion coatings during long term oxidation at 1 050 ℃ [J]. Surface and Coatings Technology, 2004, 176(3): 272-283.
[8] Chen J H, Little J A. Degradation of the platinum aluminide coating on CMSX4 at 1 100 ℃ [J]. Surface and Coatings Technology, 1997, 92(1-2): 69-77.
[9] Walston W S, Schaeffer J C, Murphy W H. A new type of microstructural instability in superalloys—SRZ //Proceedings of the 8th International Symposium on Superalloys 1996. 1996: 9-18.
[10] Matsuoka Y, Aoki A, Matsumoto K, et al. The formation of SRZ on a fourth generation single crystal superalloy applied with aluminide coating //Proceedings of Superalloys 2004. 2004: 637-642.
[11] Karunaratne M S A, Rae C M F, Reed R C. On the microstructural instability of an experimental nickel base single crystal superalloy[J]. Metallurgical and Materials Transactions A, 2001, 32(10): 2409-2421.
[12] Rae C M F, Reed R C. The precipitation of topologically close-packed phase in rhenium-containing superalloys [J]. Acta Materialia, 2001, 49(19): 4113-4125.
[13] Pollock T M, Murphy W H, Goldman E H. Grain defect formation during directional solidification of nickel base single crystals//Proceedings of Superalloys 1992. 1992: 125-134.
[14] Tryon B, Cao F, Murphy K S, et al. Ruthenium-containing bond coats for thermal barrier coating systems[J]. The Journal of Metals, 2006, 58(1): 53-59.
[15] Wang Q M, Wu Y N, Guo M H, et al. Ion-plated Al-O-N and Cr-O-N films on Ni-base superalloys as diffusion barriers[J]. Surface and Coatings Technology, 2005, 197(1): 68-76.
[16] Wang Y, Guo H B, Li H F, et al. Manufacturing and microstructure of RuAl/NiAl diffusion barrier coating for Ni-based single crystal superalloy substrate //Proceedings of 6th International Conference on Materials Processing for Properties and Performance. 2007: 9.
[17] 王开国, 李嘉荣, 刘世忠, 等. DD6单晶高温合金760℃的蠕变性能研究[J]. 材料工程, 2004(5): 7-11. Wang Kaiguo, Li Jiarong, Liu shizhong, et al. Study on creep properties of single crystal superalloy DD6 at 760℃[J]. Material Engineering, 2004(5): 7-11. (in Chinese)
[18] Das D K, Murphy K S, Ma S, et al. Formation of secondary reaction zones in diffusion aluminide-coated Ni-base single-crystal superalloys containing ruthenium [J]. Metallurgical and Materials Transactions A, 2008, 39(7): 1647-1657.
[19] Nystrom J D, Pollock T M, Murphy W H, et al. Discontinuous cellular precipitation in a high-refractory nickel-base superalloy [J]. Metallurgical and Materials Transactions A, 1997, 28(12): 2443-2452.
[20] 刘刚,刘林,赵新宝,等. 难熔元素对镍基单晶高温合金凝固特性及组织的影响[J]. 材料导报,2008, 22(9): 38-42. Liu Gang, Liu Lin, Zhao Xinbao, et al. Influence of refractory elements addition on solidification characteristics and microstructure of Ni-based single-crystal superalloys [J]. Materials Review, 2008, 22(9): 38-42. (in Chinese)
[21] Sinha A K. Topologically close-packed structures of metal alloys [M]. Longdon: Pergamon, 1972: 18-46.
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