Cr_(3)C_(2)-NiCr/AlCrN复合涂层高温摩擦学行为研究  

High Temperature Tribological Behaviors of Cr_(3)C_(2)-NiCr/AlCrN Duplex Coating

作　　者：何东青 冯子涵 郑文文 李文生[1] 尚伦霖 HE Dongqing;FENG Zihan;ZHENG Wenwen;LI Wensheng;SHANG Lunlin(State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China;State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China)

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,兰州730050 [2]中国科学院兰州化学物理研究所,固体润滑国家重点实验室,兰州730000

出　　处：《材料导报》2024年第21期219-225,共7页Materials Reports

基　　金：国家自然科学基金(52365024);甘肃省自然科学基金(22JR5RA285)。

摘　　要：通过实验分析和有限元模拟,对比研究了物理气相沉积技术制备的单层AlCrN薄膜和以超音速火焰喷涂Cr_(3)C_(2)-NiCr涂层为中间层的Cr_(3)C_(2)-NiCr/AlCrN复合涂层的微观组织、力学性能以及不同温度下的摩擦磨损行为。结果表明,Cr_(3)C_(2)-NiCr中间层对表层AlCrN薄膜的微观组织和纳米硬度的影响极小,但能避免AlCrN薄膜在承载接触点周围产生的应力集中。相较于单层薄膜,复合涂层的构建实现了材料热膨胀系数由表层AlCrN薄膜向金属基体的梯度过渡,抗热震性能显著提高。摩擦性能方面:在不同温度下复合涂层均表现出低的磨损率。在600℃以下,单层薄膜与复合涂层的主要磨损机制均为磨粒磨损;当温度升高至800℃时,单层薄膜表面发生严重的开裂及剥落,磨损机制由磨粒磨损转为剥层磨损。The microstructure,mechanical properties,and tribological behaviors of the single AlCrN film and the Cr_(3)C_(2)-NiCr/AlCrN duplex coating at different temperatures were comparatively studied by experimental analysis and finite element simulation.The results showed that the Cr_(3)C_(2)-NiCr interlayer had minimal effect on the microstructure and nano-hardness of the AlCrN film,but could avoid the stress concentration of the AlCrN film around the contact point.Compared with the single film,constructing the duplex coating achieved a gradient transition of the thermal expansion coefficient of the material from the AlCrN film to the metal substrate,and the thermal shock resistance was significantly improved.In terms of tribological properties,the duplex coating exhibited lower wear rate at different temperatures.Below 600℃,the main wear mechanism of the single AlCrN film and Cr_(3)C_(2)-NiCr/AlCrN duplex coating was abrasive wear;when the temperature increased to 800℃,the surface of the single film undergone serious cracking and peeling,and the wear mechanism was peeling wear.

关 键 词：PVD薄膜 HVOF涂层 复合涂层 应力分布 摩擦学性能 

分 类 号：TH117.1[机械工程—机械设计及理论]