摘要
通过等离子喷涂方法在穿孔顶头尾部材料42CrMo钢表面分别制备NiCr-Cr3C2涂层和Al2O3(13%TiO2)涂层,运用OM,XRD,SEM等分析测试手段对涂层的组织、形貌和物相成分进行表征,并对两种涂层进行了显微硬度及抗热震性能实验。结果表明:喷涂涂层为典型的层状结构,涂层与基体为机械结合。Al2O3(13%TiO2)涂层以亚稳相γ-Al2O3相为主要相,同时存在α-Al2O3相。喷涂形成NiCr-Cr3C2涂层后物相成分为Cr23C6、Cr7C3、Cr3C2等Cr的碳化物。NiCr-Cr3C2涂层和Al2O3(13%TiO2)涂层的表面平均显微硬度分别为586.4HV,和557.7HV。其平均热震循环次数分别为25次和18次。
Al2O3 (13%TiO2)coating and NiCr-Cr3C2 coating on 42CrMo steel substrate were prepared by plasma spraying. The microstructure, morphology and phase composition were analyzed by OM, XRD and SEM. And then the microhardness and thermal shock properties of the coatings were measured. The results show that the coatings are typical layer structure, which have mechanical bonding with the substrate. The main phases of Al2O3 coating is γ-Al2O3 as well as α- Al2O3. The main phase of NiCr-Cr3C2 coatings is Cr23C6, Cr7C...
出处
《热加工工艺》
CSCD
北大核心
2009年第2期73-75,78,共4页
Hot Working Technology
基金
成都理工大学地球探测与信息技术教育部重点实验室开放基金资助(2008DTKF002)
关键词
等离子喷涂
涂层
微观组织结构
显微硬度
热震性能
plasma spraying
coating
microstructure
microhardness
thermal shock properties
