| 引用本文: | 王浩宇,曹晓英,李定骏,方修洋,蔡振兵.CoCrWSi涂层高温冲击磨粒磨损行为*[J].中国表面工程,2023,36(3):193~204 |
| WANG Haoyu,CAO Xiaoying,LI Dingjun,FANG Xiuyang,CAI Zhenbing.Impact Abrasive Wear of CoCrWSi Coating at High Temperature[J].China Surface Engineering,2023,36(3):193~204 |
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| CoCrWSi涂层高温冲击磨粒磨损行为* |
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王浩宇1, 曹晓英2,3, 李定骏2,3, 方修洋1, 蔡振兵1
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1.西南交通大学摩擦学研究所 成都 610031;2.东方汽轮机有限公司 德阳 618000;3.长寿命高温材料国家重点实验室 德阳 618000
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| 摘要: |
| CoCrWSi 涂层由于其优异的耐高温氧化性能，有望成为汽轮机零部件的防护涂层之一。但是关于该涂层在汽轮机真实服役环境中的高温冲击磨粒磨损行为却鲜有报道。以汽轮机阀门部件材料 SA-182F92 为基体，制备 CoCrWSi 防护涂层。 利用自研的高温沙粒冲击试验机，研究 CoCrWSi 涂层在沙蚀环境中的高温冲击磨损行为，通过冲击动力学响应和磨痕形貌来评价该涂层的耐冲击磨粒磨损性能。结果表明：CoCrWSi 涂层具有耐高温冲击磨粒磨损性能，具体表现为相同冲击次数下，CoCrWSi 涂层样品的磨损面积、磨损体积和最大磨痕深度比基体样品小数倍，CoCrWSi 涂层样品的能量吸收量和吸收率均小于基体样品。在高温沙粒环境下，冲击的过程中会有大量的沙粒嵌入磨痕表面，沙粒具有的不规则棱角会切削磨痕表面，进而磨痕表面可以观察到大量犁沟。在高温沙粒环境下，基体与涂层的磨损机理为塑性变形和磨粒磨损。不同的是，软化的基体在冲击区域边缘有明显的隆起，发生更严重的塑性变形；而涂层在冲击过程中虽没有完全剥落，但涂层内部萌生了微裂纹，磨痕表面也有部分涂层剥落。研究结果是在模拟汽轮机真实服役状况下得出的，试验参数如加热温度、沙粒(杂质)、摩擦副材料等均依据汽轮机涂层应用的实际工况进行选择，对 CoCrWSi 涂层在汽轮机零部件上的应用有一定指导意义。 |
| 关键词: CoCrWSi 涂层 高温沙粒冲击 动力学响应 磨粒磨损 |
| DOI：10.11933/j.issn.1007?9289.20221017001 |
| 分类号:TG156;TB114 |
| 基金项目:长寿命高温材料国家重点实验室开放课题资助项目(DTCC28EE200791) |
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| Impact Abrasive Wear of CoCrWSi Coating at High Temperature |
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WANG Haoyu1, CAO Xiaoying2,3, LI Dingjun2,3, FANG Xiuyang1, CAI Zhenbing1
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1.Tribology Research Institute, Southwest Jiaotong University, Chengdu 610031 , China;2.Dongfang Turbine Co., Deyang 618000 , China;3.Long-life Temperature Materials State Key Laboratory, Deyang 618000 , China
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| Abstract: |
| With the development of steam turbines, the key parts of the steam turbine blades will suffer from mechanical damage, including friction wear and solid erosion, owing to the influence of high-temperature fluid and impurities. Therefore, materials used for the high-temperature components of steam turbines are required to have excellent thermal strength, oxidation resistance, and other comprehensive properties. Usually, high-temperature protective coatings are sprayed on these key components via various processes to improve the physical and chemical properties of the substrate at high temperatures. CoCrWSi coating is expected to become a protective coating for steam turbine parts owing to its excellent high-temperature oxidation resistance. However, there are few reports on the high temperature impact abrasive wear behavior of this coating. The CoCrWSi protective coating was prepared based on the steam turbine valve component material SA-182F92. The high temperature impact wear behavior of CoCrWSi coating in a sand erosion environment was studied by using self-developed high-temperature sand impact tester. The impact wear resistance of the coating was evaluated by dynamic response and impact wear scar morphology. The dynamic response data of the impact process, including the impact velocity curve and impact force curve, were obtained through the corresponding sensors. On the macro level, an optical microscope was used to observe the wear condition of the sample surface. On the micro level, SEM was used to observe the micro morphology of the surface and section of the wear scar, EDS was used to analyze the element distribution of the surface and section of the wear scar, and white light interferometer was used to measure the profile of the wear scar to obtain the maximum wear depth, area, and volume. The results show that the impact return velocity and impact force of the coating and substrate decrease with the increase in impact cycles, which is caused by the increase in contact area and decrease in stress during the impact. At the same impact cycles, the impact return velocity and impact force of the coating are greater than those of the substrate. The CoCrWSi coating has high-temperature impact abrasive wear resistance, which is specifically manifested in that under the same impact cycles. The wear area, wear volume, and wear scar depth of the coating samples are several times smaller than those of substrate samples, and the energy absorption and absorption rate of the coating samples are less than those of the substrate samples. In a high-temperature sand environment, a large number of sand particles will be embedded into the wear scar surface during the impact, and the irregular edges and corners of sand particles will aggravate this cutting effect. Then, a large number of grooves can be observed on the wear scar surface. In the high temperature sand environment, the wear mechanism of the substrate and coating is plastic deformation and abrasive wear. The difference is that the softened substrate has an obvious bulge at the edge of the impact area, resulting in serious plastic deformation. Although the coating did not completely peel off during the impact, micro cracks sprouted in the coating, and some coatings peeled off on the surface of the wear scar. The result was obtained under the condition of simulating the actual working condition of the steam turbine. The test parameters, such as heating temperature, sand material (impurities), and friction pair, were selected according to the actual working condition of the application background of the steam turbine coating, which has certain guiding significance for the application of CoCrWSi coating on steam turbine parts. |
| Key words: CoCrWSi coating high temperature impact with sand particle dynamic response abrasive wear |
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