Cyclic oxidation behavior of NiCoCrAlY/YSZ@Ni composite coatings fabricated by laser cladding

• 作者: Gui-fa Li Hai-zhong Zheng Pei-feng Zhou Ping Peng
• 来源期刊: 钢铁研究学报（英文版）
• 年，卷（期）: 2020,（10）
• 所属期刊栏目: ORIGINAL PAPERS
• 页码范围: 1226-1235
• 页数: 10页
• 语种: 英文

摘要

Composite coating on GH4169 alloy is prepared by laser cladding yttria-stabilized zirconia (YSZ)@Ni core-shell powders mixed with NiCoCrAlY alloy powders.The cyclic oxidation behavior of the coatings,especially the growth process of the oxide layer,is investigated based on experimental research and first-principle calculations.The results indicate that the oxidation resistance of coated GH4169 alloy is better than that of uncoated GH4169 alloy.The coating has three layers: a cellular dendrite outer layer,a planar YSZ interlayer,and an inner layer composed of Cr2O3 formed during laser cladding.After oxidation at 1000 and 1050 ℃,as the oxidation time increases,the cellular dendrite outer layer becomes thicker,and the planar yttria-stabilized zirconia interlayer becomes thinner.Between the planar interlayer and Cr2O3 inner layer,an Al2O3 layer formed.Notably,cracks formed in the interface of Al2O3/Cr2O3 owing to their weak interface strength,which led to the failure of the composite coating.