Surface Plasma Spraying and High Temperature Oxidation Performance of Automotive Internal Combustion Engine
摘 要
采用等离子喷涂的方法在汽车内燃机用GH4169合金表面制备了CoNiCrAlY涂层和MoSi2-CoNiCrAlY复合涂层,对比分析了单一涂层和复合涂层的物相组成、显微形貌和抗高温氧化性能,并探讨了涂层的高温氧化机制。结果表明:CoNiCrAlY涂层主要由γ'-Ni3Al、ɑ-Al2O3和γ-Co相组成,MoSi2-CoNiCrAlY复合涂层中还出现了MoSi2和Mo5Si3相;CoNiCrAlY涂层在1 025 ℃条件下氧化不同时间所得氧化膜的物相组成都为Cr2O3、ɑ-Al2O3、NiCr2O4和(Co,Ni)Cr2O4,而MoSi2-CoNiCrAlY复合涂层氧化膜中还形成了部分SiO2相;MoSi2-CoNiCrAlY复合涂层的硬度高于CoNiCrAlY涂层的,抗氧化能力明显优于CoNiCrAlY涂层的;CoNiCrAlY涂层“快速氧化阶段”和“稳定氧化阶段”的影响要素分别为NiO、NiCr2O4和(Co,Ni)Cr2O4尖晶石相的生长速率和Al2O3致密氧化膜的生长速率,而影响MoSi2-CoNiCrAlY复合涂层高温氧化性能的关键要素为SiO2的扩散和流动能力。
Abstract
CoNiCrAlY coating and MoSi2-CoNiCrAlY composite coating were prepared on the surface of GH4169 alloy for automotive internal combustion engine by plasma spraying. The phase composition, microstructure and high temperature oxidation resistance of single coating and composite coating were comparatively analyzed, and the mechanism of high temperature oxidation of coatings was explored. The results show that the CoNiCrAlY coating was mainly composed of γ'-Ni3Al, ɑ-Al2O3 and γ-Co, MoSi2 and Mo5Si3 phases also appeared in MoSi2-CoNiCrAlY composite coatings; the phases of CoNiCrAlY coating at 1 025 ℃ with different oxidation times were Cr2O3, ɑ-Al2O3, NiCr2O4 and (Co,Ni) Cr2O4, while SiO2 phase was also formed in the oxide film of MoSi2-CoNiCrAlY composite coating; the hardness of the MoSi2-CoNiCrAlY composite coating was higher than that of CoNiCrAlY coating, the antioxidant capacity was significantly better than that of CoNiCrAlY coating. Influence factors in “rapid oxidation stage” and “stable oxidation stage” of CoNiCrAlY coating were NiO, NiCr2O4 and (Co, Ni) Cr2O4 spinel phase growth rate and the growth rates of Al2O3 compact oxide film, and the key factors affecting MoSi2-CoNiCrAlY composite coating for high temperature oxidation were diffusion and flow capacity of SiO2.
中图分类号 TG174.4 DOI 10.11973/fsyfh-201905007
所属栏目 试验研究
基金项目 重庆市教育委员会科学技术研究计划(KJZD-K20803201)
收稿日期 2017/12/6
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引用该论文: YUAN Miaoda,SHU Haibo. Surface Plasma Spraying and High Temperature Oxidation Performance of Automotive Internal Combustion Engine[J]. Corrosion & Protection, 2019, 40(5): 340
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【6】杨德明,高阳,周起帆. 微观组织结构对NiCrAlY涂层抗高温氧化性能的影响[J]. 中国表面工程,2017,30(5):119-125.
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【9】叶辉,郭平,张姗. 等离子喷涂NiCr和Cr3C2-NiCr涂层的抗高温氧化性能[J]. 电镀与涂饰,2016,35(14):765-770.
【10】杨二娟,李太江,李勇. AC-HVAF和HVOF制备MCrAlY粘结层的组织结构及高温氧化性能[J]. 材料保护,2016,49(2):25-29,7.
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