Abstract：
:The CoCrMo matrix composites with nano-TiO2 particle (2 wt.%, 4 wt.% and 6 wt.%) were fabricated by using a powder metallurgy technique (P/M), and the nano-TiO2 content was optimized in matrix. The microstructures, mechanical and high-temperature tribological properties of the synthesized composites were systematically studied. Friction and wear behaviors were studied by using a disk-on-ball tribo-tester sliding against Si3N4 ceramic ball from room temperature (23 oC) to 1000 oC in air. TiO2 obviously strengthened the hardness and high-temperature wear resistance of composites. It was attributed to the high load-carrying capacity of matrix, in-situ formed high-temperature solid lubricants and stable oxides film on the wear tracks. 4 wt.% TiO2 was the critical threshold at which there was a transition of tribological properties over a broad temperature range. The composite containing 4 wt.% nano-TiO2 exhibited the most reasonable high-temperature friction coefficient and wear rate at all testing temperatures. At different testing temperatures, the composites showed different wear mechanisms.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Cui G,Liu Y,Li S,Liu H,Gao G,Kou Zdoi
10.1038/s41598-020-63918-4subject
Has Abstractpub_date
2020-04-22 00:00:00pages
6816issue
1issn
2045-2322pii
10.1038/s41598-020-63918-4journal_volume
10pub_type
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