Back to Search
Start Over
Effect of in-situ synthesis of multilayer graphene on the microstructure and tribological performance of laser cladded Ni-based coatings.
- Source :
-
Applied Surface Science . Nov2019, Vol. 495, pN.PAG-N.PAG. 1p. - Publication Year :
- 2019
-
Abstract
- Graphene (Gr) has been regarded as the promising reinforcement for metal matrix composite coatings. However, it is hard to mix nano-scale Gr with micron-scale metal powders effectively at present, restricting the extensive application of Gr in engineering field. Therefore, this work proposed a new two-step method to in-situ synthesize multilayer Gr on the surface of Ni60 powders by combining ultrasonic and wet milling. Under protective atmosphere, Ni60 + Gr coatings were fabricated using laser cladding technique. In-situ synthesized multilayer Gr were successfully incorporated into Ni60 coatings, but part of them were transformed into the fullerene-like structures. In addition, a new matrix phase of Ni-Cr-Fe with bcc structure was generated in Ni60 + Gr coatings owing to the super adsorption effect of Gr on Ni, Cr and Fe atoms. The second phases such as chromium carbides in Ni60 + Gr coatings were refined and distributed more uniformly compared with that of Ni60 coatings. Furthermore, Ni60 + Gr coatings showed excellent tribological performance than that of Ni60 coatings, which was attributed to the synergistic effect between the lubrication of Gr or fullerene-like structures and the superior dispersion strengthening of the second phases. • Multilayer Gr on the surface of Ni60 powders by combing ultrasonic and wet milling was in-situ synthesized. • Multilayer Gr were incorporated into Ni60 coatings, but part of them were transformed into the fullerene-like structures. • Ni-Cr-Fe with bcc structure was generated in Ni60+Gr coatings. • The second phases in Ni60+Gr coatings were refined and distributed more uniformly compared with that of Ni60 coatings. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 01694332
- Volume :
- 495
- Database :
- Academic Search Index
- Journal :
- Applied Surface Science
- Publication Type :
- Academic Journal
- Accession number :
- 141580497
- Full Text :
- https://doi.org/10.1016/j.apsusc.2019.143581