不同喷涂工艺下NiCoCrAlYTa涂层的显微结构和性能

发布时间：2018-01-15 11:42

本文关键词：不同喷涂工艺下NiCoCrAlYTa涂层的显微结构和性能　出处：《材料导报》2017年16期 　论文类型：期刊论文

【摘要】：为探索不同喷涂工艺对NiCoCrAlYTa涂层的显微结构和性能的影响规律,确定最优工艺,采用大气等离子、低压等离子、常规超音速火焰和低温超音速火焰4种工艺在镍基单晶高温合金表面制备了NiCoCrAlYTa涂层。采用X射线衍射(XRD)、扫描电镜(SEM)和显微硬度计等分析手段对喷涂态涂层的相组成、显微结构和显微硬度等进行了表征。结果表明,不同喷涂工艺下涂层的相组成均为γ′-Ni_3Al、β-NiAl和γ-Ni固溶体。低压等离子和超音速火焰喷涂的涂层致密且孔隙率低,其中超音速火焰喷涂的涂层孔隙率低于1%。低压等离子和低温超音速火焰喷涂的涂层氧含量很低,控制在0.3%~0.6%的范围。综合来说,低温超音速火焰喷涂工艺制备的涂层结构致密,孔隙率和氧含量很低。该工艺是沉积NiCoCrAlYTa涂层的首选。
[Abstract]:In order to find out the influence of different spraying processes on the microstructure and properties of NiCoCrAlYTa coating and to determine the optimal process, atmospheric plasma and low pressure plasma were used. NiCoCrAlYTa coatings were prepared on the surface of nickel based single crystal superalloy by conventional supersonic flame and low temperature supersonic flame. The phase composition, microstructure and microhardness of the sprayed coating were characterized by SEM (SEM) and microhardness tester. The phase compositions of the coatings under different spraying conditions are 纬 -ni _ 3Al, 尾 -NiAl and 纬 -Ni solid solution. The coatings sprayed by low pressure plasma and supersonic flame are compact and have low porosity. The coating porosity of supersonic flame spraying is less than 1. The oxygen content of the coating is very low in low pressure plasma spraying and low temperature supersonic flame spraying, and the oxygen content is controlled in the range of 0. 3% or 0. 6%. The coating prepared by low temperature supersonic flame spraying is compact in structure and low in porosity and oxygen content. This process is the first choice for deposition of NiCoCrAlYTa coatings.
【作者单位】：广东省新材料研究所现代材料表面工程技术国家工程实验室广东省现代表面工程技术重点实验室;
【基金】：广东省对外合作项目(2013B050800027) 广州市对外合作项目(201508030001) 广东省引进创新科研团队计划(2011C007)
【分类号】：TG174.4
【正文快照】： 0引言MCrAlY高温防护涂层最早发展于20世纪70年代,由于该涂层具有优异的抗高温氧化和抗高温腐蚀性能,被广泛应用于高温合金的防护层或者热障涂层的粘结层[1-2]。目前,MCrAlY高温防护涂层一般使用NiCrAlY四元合金材料,工作环境更为苛刻的可采用五元NiCoCrAlY或者六元NiCoCrAlYT

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