Microstructure and wear behavior of TiAl 3 matrix self-lubricating composites by addition of fluoride solid lubricants
Source abstract
Abstract
Abstract The microstructure of TiAl 3 composites with addition of different weight contents of solid lubricant (LiF, NaF, CaF 2 , and 38% CaF 2 -62% BaF 2 ) were observed by scanning electron microscopy. Hardness, bend strength, and fracture toughness tests were carried out on an electron omnipotence testing machine. The friction and wear tests were performed using a high-temperature pin-on-disc tribometer at different friction conditions such as different loads, different sliding speeds, and different working temperatures. The results show that TiAl 3 composites with 38% CaF 2 -62% BaF 2 solid lubricant exhibit higher bending strength and fracture toughness than composites with other solid lubricants. In addition, the wear rate of TiAl 3 composites with 38% CaF 2 -62% BaF 2 solid lubricant is lowest in all composites. It is attributed to 38% CaF 2 -62% BaF 2 solid lubricant forming a compact film on the wear surface of TiAl 3 composites. The compact-film-forming mechanism is attributed to fluoride particles forced out of the reservoirs due to its high thermal expansion coefficient.
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Research context
OpenAlex topics: Metal and Thin Film Mechanics · Advanced ceramic materials synthesis · Intermetallics and Advanced Alloy Properties
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Affiliations
School of Materials Science and Engineering, University of Jinan, Jinan 250022, P.R. China
School of Mechanical Engineering, University of Jinan, Jinan 250022, P.R. China
References
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