Oxidation Performance and Interdiffusion Behavior of a Pt-Modified Aluminide Coating with Pre-deposition of Ni

• 来源期刊: 金属学报（英文版）
• 年，卷（期）: 2019,（12）
• 页码范围: 1490-1500
• 页数: 11页
• 语种: 英文

摘要

To refrain the interdiffusion of elements while holding good oxidation resistance,a (Ni,Pt)A1/Ni composite coating was prepared by sequential treatments of electroplating Ni and Pt and successive gaseous aluminization.In comparison with normal (Ni,Pt)Al coating,high-temperature performance of the composite coating was evaluated in isothermal oxidation test at 1100 ℃.Both the two coatings exhibited good resistance against high-temperature oxidation,but the interdiffusion of elements between composite coating and single-crystal (SC) superalloy substrate was greatly relieved,in which the thickness of secondary reaction zone (SRZ) and the amount of precipitated topologically close-packed phase in the SC alloy matrix were significantly decreased.Mechanisms responsible for delaying rate of coating degradation and SRZ growth/propagation are discussed.