|About this Abstract
||The 7th Pacific Rim International Conference on Advanced Materials and Processing (PRICM 7)
||Symposium G: Thin Films and Surface Engineering
||Investigation on Oxidation Resistance of NiCoCrAlY Coating Irradiated by High Current Pulsed Electron Beam
||Xianxiu Mei, Cunxia Wang, Wei Qu, Ying Qin, Chuang Dong, Younian Wang
|On-Site Speaker (Planned)
NiCoCrAlY transition layer are widely applied in thermo-barrier coatings to reduce the thermal stress between the outer oxide layer and Ni-based high-temperature alloy substrates. DZ4 substrates were coated with NiCoCrAlY by plasma spray and subsequently treated by a high-current pulsed electron beam (HCPEB) for the purpose of smoothing the surface and releasing stresses. As a result of the HCPEB treatment the loose and originally rough surface structure were remelted and smoothened but craters and cracks appeared frequently. The phase content is increased. The stresses were effectively released as reflected by invisible XRD diffraction peak shifts. Oxidation tests at 900°C for 100h showed that the oxidation layers consist of abundant α-Al<sub>2</sub>O<sub>3</sub> and minor NiO, which improved the oxidation resistance of the NiCoCrAlY coatings significantly.