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Study of tribofilms formed during dry sliding of Ta2AlC/Ag or Cr2AlC/Ag composites against Ni-based superalloys and Al2O3статья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 2 апреля 2015 г.
- Авторы: Gupta S., Filimonov D., Zaitsev V., Palanisamy T., El-Raghy T., Barsoum M.W.
- Журнал: Wear
- Том: 267
- Номер: 9-10
- Год издания: 2009
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Первая страница: 1490
- Последняя страница: 1500
- DOI: 10.1016/j.wear.2009.03.021
- Аннотация: Herein we show that dry sliding, in air, in the 25-550 degrees C temperature range, of the novel Ta2AlC/20 vol.% Ag and Cr2AlC/20 vol.% Ag composites against Ni-based superalloys (SAs) and alumina led to the formation of steady-state tribofilms whose thicknesses and compositions varied depending on sliding conditions. At elevated temperatures, under both isothermal and thermocyclic conditions, relatively thick (> 0.5 mu m) well-compacted "glaze" lubricious tribofilms were developed as a result of joint action of tribo-chemical and tribo-mechanical factors involving repeated tribo-oxidation, mixing, fracturing, sintering, etc. They were mainly composed of oxidized constituents from both counterparts (if slid vs. SA) or solely from MAX-Ag ones (vs. Al2O3) and possessed a fine multi-layered microstructure, i.e. a more oxidized thin outermost layer and a less oxidized carbide-containing thicker inner layer. During thermocycling the tribofilms adapted to 25-550 degrees C temperature variations and preserved their primary macro-and microstructure, hardness, good adhesion to the matrix and lubricating characteristics. Consequently, the tribological properties of MAX-Ag/SA tribocouples did not deteriorate, but slightly improved with sliding distance. A possible mechanism of tribofilm generation and their transformations at various temperatures is discussed. The effect of SA and alumina counterparts on the formation and degradation of the tribofilms are also discussed. (C) 2009 Elsevier B. V. All rights reserved.
- Добавил в систему: Филимонов Дмитрий Сергеевич