| 直接激光沉积Al2O3增强NiCrAlY涂层的微观组织及力学性能 |
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| 引用本文： | 吴东江,刘妮,余超,崔强,牛方勇,马广义,赵凯.直接激光沉积Al2O3增强NiCrAlY涂层的微观组织及力学性能[J].表面技术,2020,49(1):203-212. |
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| 作者姓名： | 吴东江 刘妮 余超 崔强 牛方勇 马广义 赵凯 |
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| 作者单位： | 1.大连理工大学 精密与特种加工教育部重点实验室，大连116024,1.大连理工大学 精密与特种加工教育部重点实验室，大连116024,1.大连理工大学 精密与特种加工教育部重点实验室，大连116024,1.大连理工大学 精密与特种加工教育部重点实验室，大连116024,1.大连理工大学 精密与特种加工教育部重点实验室，大连116024,1.大连理工大学 精密与特种加工教育部重点实验室，大连116024,2.上海航天设备制造总厂有限公司，上海200245 |
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| 基金项目： | 国家自然科学基金青年科学基金（51805070） |
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| 摘 要： | 目的改善NiCrAlY涂层微观组织并提高其力学性能。方法采用直接激光沉积方法制备100%NiCrAlY、NiCrAlY+10%Al_2O_3和Ni CrAlY+20%Al_2O_3三种样件,分别利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、X射线能量色散谱仪(EDS)、电子探针X射线显微分析仪(EPMA),对不同成分样件进行相组成分析、微观组织观察以及元素组成检测,使用维式显微硬度测试计和万能摩擦磨损试验机,分别检测各个涂层的显微硬度和摩擦系数。结果在NiCrAlY中添加Al_2O_3后,Al_2O_3以不规则形状或球形分布在晶内或者晶界处,其尺寸小于2μm。三种复合涂层样件均由γ-Ni和β-NiAl相组成,添加Al_2O_3陶瓷颗粒后,涂层一次枝晶臂间距均减小,且Ni-Y相显著减少,Y2O3陶瓷颗粒弥散分布在基体的晶内与晶界处。NiCrAlY、NiCrAlY+10%Al_2O_3和NiCrAlY+20%Al_2O_3涂层的平均硬度分别为(440.69±30)HV0.2、(482.18±30)HV0.2和(453.09±20)HV0.2,100%NiCrAlY、NiCrAlY+10%Al_2O_3和NiCrAlY+20%Al_2O_3涂层的摩擦系数分别为0.77、0.55和0.52。结论加入Al_2O_3后,基体晶粒有一定程度的细化。在晶粒细化作用以及陶瓷颗粒弥散作用下,涂层的显微硬度有所提高,其中NiCrAlY+10%Al_2O_3的硬度最高,相比NiCrAlY基体提高了约9.5%。此外,发现添加Al_2O_3后,NiCrAlY+10%Al_2O_3和NiCrAlY+20%Al_2O_3样件的摩擦系数比NiCrAlY样件下降均超过25%,其中NiCrAlY+10%Al_2O_3样件的磨损量最小,相对于NiCrAlY涂层下降了近13.5%,耐磨性明显改善。
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| 关 键 词： | 直接激光沉积 Al2O3 NiCrAlY涂层 微观组织 显微硬度 摩擦磨损 |
| 收稿时间： | 2019/7/23 0:00:00 |
| 修稿时间： | 2020/1/20 0:00:00 |
Microstructure and Mechanical Properties of Al2O3 Reinforced NiCrAlY Coatings by Directed Laser Deposition |
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| WU Dong-jiang,LIU Ni,YU Chao,CUI Qiang,NIU Fang-yong,MA Guang-yi,ZHAO Kai.Microstructure and Mechanical Properties of Al2O3 Reinforced NiCrAlY Coatings by Directed Laser Deposition[J].Surface Technology,2020,49(1):203-212. |
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| Authors: | WU Dong-jiang LIU Ni YU Chao CUI Qiang NIU Fang-yong MA Guang-yi ZHAO Kai |
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| Affiliation: | 1.Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian 116024, China,1.Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian 116024, China,1.Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian 116024, China,1.Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian 116024, China,1.Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian 116024, China,1.Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian 116024, China and 2.Shanghai Aerospace Equipments Manufacturer Co., Ltd, Shanghai 200245, China |
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| Abstract: | |
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| Keywords: | direct laser deposition Al2O3 NiCrAlY coating microstructure microhardness friction and wear |
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