期刊
CERAMICS INTERNATIONAL
卷 48, 期 19, 页码 28013-28022出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2022.06.106
关键词
Pressure less sintering; Friction; Elevated temperatures; Molybdenum; Wear
资金
- DST, India [SR/NM/NT-1062/2015]
This study investigates the tribological performances of Mo reinforced ZTA ceramics at elevated temperatures. The results show that composites with 15 wt % Mo - ZTA and 10 wt % Mo - ZTA exhibit the lowest friction coefficient and specific wear rate at 750 degrees C, most likely due to the formation of molybdenum-oxide-rich lubricating tribo-films on the worn surface.
Molybdenum (Mo) reinforced zirconia-toughened alumina (ZTA) composites are a vital class of self-lubricating ceramics with potential applications as seals, dies and cutting tools. However, their tribological behaviours under elevated temperatures remain largely unexplored. The present study investigates the tribological performances of pressure-less sintered ZTA ceramics containing various weight percentages (0, 5, 10 and 15 wt %) of Mo at elevated temperatures (500 degrees C and 750 degrees C). Formation of self-lubricating Mo oxides at tribo-interfaces was observed when the temperature increases from 500 degrees C to 750 degrees C. The least friction coefficient (0.34) and specific wear rate of (1.057 x 10-4 mm3/N-m) were observed at 750 degrees C for 15 wt % Mo - ZTA and 10 wt % Mo - ZTA composites respectively. Phase analysis, and morphological and elemental studies on the wear tracks confirmed the presence of molybdenum-oxide-rich thin lubricating tribo-films on the worn surface, and suggest adhesion as the dominant wear mechanism.
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