| YONG Zhao,HUA Yin-qun.High Temperature Oxidation of CoCrAlYSiHf Coatings by Laser Cladding[J],47(5):98-103 |
| High Temperature Oxidation of CoCrAlYSiHf Coatings by Laser Cladding |
| Received:January 11, 2018 Revised:May 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.05.015 |
| KeyWord:laser cladding CoCrAlYSiHf coating hafnium high temperature oxidation Cr2O3 spinel micro-crack |
| Author | Institution |
| YONG Zhao |
Research Institute of New Material, Jiangsu University, Zhenjiang , China |
| HUA Yin-qun |
Research Institute of New Material, Jiangsu University, Zhenjiang , China |
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| Abstract: |
| The work aims to study the influence of hafnium content on high temperature oxidation resistance of CoCrAlYSiHf coatings prepared by laser cladding. The laser cladding powder used in the experiment was milled by laboratory planetary ball mill and dried by vacuum. Laser cladding method was adopted to prepare two coatings with different hafnium content (x and 3x) on GH586 respectively. The static resistance to high temperature oxidation of these two coatings at 1100 ℃ in atmospheric environment was also tested in SX2 high temperature resistance furnace. The surface morphology and structural evolution of oxidation films on coatings during high temperature oxidation process were characterized by scanning electron microscope (SEM), X-ray diffractometer (XRD) and energy dispersive spectrometer (EDS). The coating with 3x hafnium prepared by laser cladding showed many pores and micro-cracks on the surface, while the coating with x hafnium content was smooth and uniform without visibly defects. A layer of continuous and compacted Cr2O3 oxidation film was formed on the coating by laser cladding with x hafnium content after high temperature oxidation at 1100 ℃, while many spinel and pores were distributed in the oxide on the coating by laser cladding with 3x hafnium after high temperature oxidation at 1100 ℃. The high temperature oxidation resistance of Co-CrAlYSiHf coating by laser cladding with 3x hafnium is obviously lower than that of coating with x. |
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