【摘 要】
:
NiCrAlY coatings of 200 m thick were deposited on Ni-base superalloy (Ni-51.21%, Cr-19.7%, Al-0.37%, Nb-5.39%, Mo-3.18%, Ti-1.34%, Fe-18.81%) by electron-spark deposition to enhance the oxidation resi
【机 构】
:
National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology Harbi
【出 处】
:
第十一届全国表面工程大会暨第八届全国青年表面工程学术会议
论文部分内容阅读
NiCrAlY coatings of 200 m thick were deposited on Ni-base superalloy (Ni-51.21%, Cr-19.7%, Al-0.37%, Nb-5.39%, Mo-3.18%, Ti-1.34%, Fe-18.81%) by electron-spark deposition to enhance the oxidation resistance of the alloy. Cyclic oxidation tests of the alloy with and without NiCrAlY coating were carried out at 850, 900 and 1000℃. X-ray diffraction(XRD), scanning electron microscopy(SEM) with energy-dispersive X-ray spectroscopy(EDS) were used to investigate the nature of oxidation layers. The internal oxidation and grain-boundary cracks are observed from the cross-section SEM images for the alloy without NiCrAlY coating after cyclic oxidation tests. While for the alloy with NiCrAlY coating, a continue dense oxide layer covered on surface is found and the XRD results indicate this oxide layer is composed by Al2O3. The electrospark depositing of NiCrAlY coating on surperalloy is usful technology for protecting suralloy from oxidation.
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