目的通过等离子合金化高熵合金涂层,提高铸铁表面耐磨性。方法采用等离子合金化法,以等摩尔比的Al,Co,Cr,Cu,Mn,Ni单质金属粉在HT250铸铁表面制备高熵合金复合涂层。通过SEM,EDS,XRD等分析涂层的组织,测试涂层的显微硬度分布。结果由于铸铁基体少量熔化,基体中的Fe和C元素进入涂层,形成了厚度约为0.2 mm的Al Co Cr Cu FexMn Ni Cx高熵合金涂层。从涂层表面到基材,体系的混合熵呈高熵-中熵-低熵的梯度变化。涂层主要由高熵合金的枝晶和枝晶间渗碳体、σ相等组织构成,主要有FCC,BCC,Fe3C及σ相。涂层的显微硬度大约为350~600HV0.2,明显高于铸铁基体的硬度（200~230HV0.2）。结论通过等离子合金化可以在铸铁表面形成高熵合金＋碳化物的复合涂层,提高了铸铁的显微硬度,有利于铸铁表面耐磨性的提高。
文章通过分析机械制造专业群教学方法的研究现状,指出存在教学内容与产业发展脱节、实践教学资源匮乏、职业教育教学与科研融合度不够、教学手段和评价体系单一、产学研用协同育人机制不完善等问题,提出通过创新教学方法、优化与完善课程体系和教学内容、组建高水平课程教学团队、创新教学手段和评价体系、完善产学研用协同育人深度合作机制等创新产学研用协同育人的教学方法,进而实现“新双高”建设的产教融合目标,为我国制造业的发展提供人力支持。By analyzing the research status of the teaching methods of mechanical manufacturing specialty group, this paper points out the existing problems, such as the disconnection between teaching content and industrial development, the lack of practical teaching resources, the insufficient integration of vocational education teaching and scientific research, the single teaching tactics and evaluation system, and the imperfect mechanism of production-learning-research-application collaborative education. This paper proposes to innovate teaching methods of production-learning-research-application collaborative education, such as the innovation of teaching method, the optimization and improvement of curriculum system and teaching content, the formation of high-level curriculum teaching team, the innovation of teaching tactics and evaluation system, and the improvement of the deep cooperation mechanism of production-learning -research-application collaborative education, so as to realize the goal of production-education integration of “New Double High-Level Plan” construction, and provide human support for the development of China’s manufacturing industry.
