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| 纳米Y2O3-Co基合金激光熔覆复合涂层的分析 |
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杨尚磊1,2, 张文红3, 李法兵1, 胡风光3, 陈爱中3, 吕运江3
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1.青岛科技大学, 材料科学与工程学院, 山东 青岛 266042;2.清华大学, 机械工程系, 北京 100084;3.兖矿鲁南化肥厂, 山东 滕州 277527
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| 摘要: |
| 采用纳米Y2O3和Co基合金粉末,并利用激光表面熔覆技术和堆焊技术在Ni基合金基体上制备了纳米Y2O3-Co基合金复合涂层.运用扫描电镜(SEM)等测试方法,研究了复合涂层的显微组织和显微硬度,通过磨损试验和腐蚀试验分析了激光熔覆涂层和单一堆焊层的耐磨性和耐蚀性。结果表明,激光熔覆层显微组织由熔合区、细等轴状枝晶区及粗枝晶区构成;激光熔覆层的显微硬度由堆焊层的512.8HV提高到868.9HV;激光熔覆层的耐磨性提高了51.2倍,40min磨损量由堆焊层的25.6mg降低到激光熔覆层的0.5mg;激光熔覆层在10%HCl、10%HNO3和10%NaOH中的耐腐蚀性均比堆焊表面有明显改善。 |
| 关键词: 纳米Y2O3 Co基合金 激光表面熔覆 |
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| 基金项目:青岛科技大学科研基金资助项目(2007-03) |
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| Investigation on laser cladded nano-Y2O3 and cobalt based composite coating |
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YANG Shanglei1,2, ZHANG Wenhong3, LI Fabing1, HU Fengguang3, CHEN Aizhong3, LÜ Yunjiang3
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1.College of Material Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China;2.Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China;3.Yankuang Lunan Chemical Fertilizer Plant, Tengzhou 277527, China
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| Abstract: |
| A composite coating was prepared on a Ni-based alloy substrate by using laser cladding as well as surfacing welding with nano-Y2O3 and Co-based alloy powders.The microstructure and microhardness of the nano-Y2O3/Co-based composite coating were investigated using various techniques, e.g., scanning electron microscope(SEM).The wear resistance property and corrosion resistance property of the nano-Y2O3/Co-based laser cladding composite coating and pure surfacing welding were analysized by wear test and corrosion test.The results showed that the microstructure of laser cladding layer consists of a melt zone, a fine equiaxial zone and a coarse dendrite zone.The microhardness of the laser cladded coating was measured as HV868.9, superior to that of surfacing welding as HV512.8.Furthermore the wear resistance of laser cladding coating is 51.2 times stronger, with a total wear value of 0.5 mg compared to 25.6 mg obtained from the surfacing welding.In the corrosion tests of 10% HCl, 10% HNO3 or 10% NaOH solutions, the corrosion resistance properties of laser cladding coating is greatly enhanced. |
| Key words: nano-Y2O3 Co-based alloy laser cladding |
