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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2011, Vol. 32 ›› Issue (4): 758-764.doi: CNKI:11-1929/V.20101110.1442.001

• Material Engineering and Mechanical Manufacturing • Previous Articles    

Impact of Ru Buffer Layer on Diffusion Behavior Between NiCoCrAlY and Single Crystal Superalloy DD6

WANG Juan1, PENG Hui1, CHEN Guozhong2, GUO Hongbo1, GONG Shengkai1   

  1. 1. School of Materials Science and Engineering, Beihang University, Beijing 100191, China;
    2. AVIC Shenyang Liming Aero-engine(Group)Corporation Ltd., Shenyang 110043, China
  • Received:2010-07-24 Revised:2010-08-25 Online:2011-04-25 Published:2011-04-25

Abstract: 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.

Key words: electron beam physical vapor deposition, single crystal superalloy, coating, secondary reaction zone, topologically close-packed phase, interdiffusion

CLC Number: