Friction and Wear Characteristics of Single Crystal Ni-Based Superalloys at Elevated Temperatures
Friction and Wear Characteristics of Single Crystal Ni-Based Superalloys at Elevated Temperatures
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单晶镍基高温合金的高温摩擦磨损特性
DOI：
10.1007/s11249-018-0994-1
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Dilip Shah
中科院分区：
文献类型：
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作者：
P. Stoyanov;L. Dawag;D. Goberman;Dilip Shah
本研究旨在探讨单晶高温合金在高温下之摩擦磨损行为。销板实验进行了定制的高温微动/磨损装置。对两种单晶Ni基合金和Waspaloy®（用作基线材料）进行测量。单晶材料的摩擦系数（即，在磨合和稳定状态期间）与Waspaloy®相比更低。此外，实验表明，单晶的摩擦系数取决于晶面;与{111}面相比，{100}面上的摩擦系数较低。磨损行为与摩擦行为一致，其中单晶Ni基合金显示出比Waspaloy®略高的耐磨性。通过FIB/SEM和XPS分析的非原位分析表明，在单晶合金表面上形成了Co基金属氧化物层。类似地，在对立面上观察到钴基氧化物层，提供自匹配的氧化物对氧化物接触，因此与Waspaloy®相比具有更低的摩擦和磨损。
The purpose of this study was to investigate the friction and wear behavior of single crystal superalloys at elevated temperatures. Pin-on-plate experiments were conducted using a custom-built high-temperature fretting/wear apparatus. Measurements were performed on two single crystal Ni-based alloys and Waspaloy®(used as a baseline material). The coefficient of friction for the single crystal materials (i.e., during running-in and steady state) was lower compared to the Waspaloy®. In addition, the experiments showed that the friction coefficient of the single crystal is dependent on the crystallographic plane; the friction coefficient was lower for the tests on the {100} plane compared to the {111} plane. The wear behavior was aligned with the friction behavior, where the single crystal Ni-based alloys showed slightly higher wear resistance compared to the Waspaloy®. Ex situ analysis by means of FIB/SEM and XPS analysis revealed the formation of Co-base metal oxide layer on the surface of the single crystal alloy. Similarly, a Co-base oxide layer is observed on the counterface providing a self-mated oxide-on-oxide contact and thus lower friction and wear compared to the Waspaloy®.