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Heterogeneous nuclei effect of MgAl2O4 on NbC in Fe matrix MMC coating

Zhao, C, Zhou, Y, Xing, X, Ren, X and Yang, Q (2018) Heterogeneous nuclei effect of MgAl2O4 on NbC in Fe matrix MMC coating. Applied Surface Science, 469. pp. 713-719. ISSN 0169-4332

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Abstract

Niobium carbide (NbC) reinforced metal matrix composite (MMC) coatings have been widely applied for surface strengthening, and the precipitation of granular primary NbC may be a feasible way to improve the wear resistance of coating. In this work, MgAl2O4 was selected to promote the precipitation of granular primary NbC, and a combination of experimental observations and first-principles modelling were carried out to investigate it. The calculation results show that, misfit between MgAl2O4 and NbC is 8.7%, which indicates that the MgAl2O4 nucleating effecting on NbC is structurally potent. In order to eliminate the interference combination between different elements, the MgAl2O4 (1 1 1)/NbC (1 1 1) interface overlaps were selected, and four different element matches are designed: O(Mg)Nb, Al(Mg)Nb, Al(Mg)C and Mg(O)C. From the interfacial adhesion work and interfacial energy, the stability order of the four models can be found: O(Mg)Nb > Al(Mg)C > Al(Mg)Nb > Mg(O)C. Moreover, mixture bonding of metal bonds, ionic bonds and covalent bonds are formed at the interface of O(Mg)Nb, Al(Mg)Nb, Al(Mg)C and Mg(O)C. From the experimental results, core-shell primary NbC carbides can be observed in M-1 (0.5 wt% AlMg alloy powder) coating and the core of carbide is identified to be MgAl2O4. Besides, the wear loss of M-1 coating is decreased, compared to M-0 coating.

Item Type: Article
Uncontrolled Keywords: MD Multidisciplinary
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TJ Mechanical engineering and machinery
Divisions: Maritime & Mechanical Engineering (merged with Engineering 10 Aug 20)
Publisher: Elsevier BV
Related URLs:
Date Deposited: 13 Feb 2019 11:57
Last Modified: 14 Nov 2019 08:00
DOI or Identification number: 10.1016/j.apsusc.2018.11.089
URI: https://researchonline.ljmu.ac.uk/id/eprint/10157

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