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Effect of Heat Treatment on Interface Behavior in Ni-P/Cr Double Layer
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 Title & Authors
Effect of Heat Treatment on Interface Behavior in Ni-P/Cr Double Layer
Choi, Myung-Hee; Park, Young-Bae; Rhee, Byong-ho; Byon, Eungsun; Lee, Kyu Hwan;
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The thermal barrier coating (TBC) for inner wall of liquid-fuel rocket combustor consists of NiCrAlY as bonding layer and as a top layer. In most case, the plasma spray coating is used for TBC process and this process has inherent possibility of cracking due to large difference in thermal expansion coefficients among bonding layer, top layer and metal substrate. In this paper, we suggest crack-free TBC process by using a precise electrodeposition technique. Electrodeposited Ni-P/Cr double layer has similar thermal expansion coefficient to the Cu alloy substrate resulting in superior thermal barrier performance and high temperature oxidation resistance. We studied the effects of phosphorous concentrations (2.12 wt%, 6.97 wt%, and 10.53 wt%) on the annealing behavior () of Ni-P samples and Cr double layered electrodeposits. Annealing temperature was simulated by combustion test condition. Also, we conducted SEM/EDS and XRD analysis for Ni-P/Cr samples. The results showed that the band layers between Ni-P and Cr are Ni and Cr, and has no formed with heat treatment. These band layers were solid solution of Cr and Ni which is formed by interdiffusion of both alloy elements. In addition, the P was not found in it. The thickness of band layer was increased with increasing annealing time. We expected that the band layer can improve the adhesion between Cr and Ni-P.
Inner Wall of Liquid-fuel Rocket Combustor;Thermal Barrier Coating;Electrodeposition;Ni-P/Cr;Annealing;Band Layer;
 Cited by
열처리 조건에 따른 무전해 Ni/전해 Cr 이중도금의 계면반응 및 균열성장거동 분석,손기락;최명희;이규환;변응선;이병호;박영배;

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