Fabrication and characterization of Fe-based amorphous coatings prepared by high-velocity arc spraying

Wenmin Guo, Jianfeng Zhang, Yuping Wu, Sheng Hong, Yujiao Qin

    Research output: Contribution to journalArticle

    24 Citations (Scopus)

    Abstract

    Fe-based coatings with a high amorphous content were firstly developed by the traditional twin wires arc spray technology. In consideration of empirical rules, including the multi-component system, an optimal concentration of small atoms, negative heat of mixing and an appropriate atom size mismatch among the main components, the cored wires were designed to contain eight elements, which have an optimized atomic volume strain criterion λn, in range of 0.14-0.21, to render the coatings a high glass forming ability. Then the coatings were prepared using the above-designed cored wires through a rapid arc spray melting and solidification process. Crystalline phases could not be identified from the XRD patterns within the XRD resolution limits, suggesting that the as-sprayed coatings were approximately comprised of fully amorphous phases. With a dense structure and a low porosity of only 2%, the amorphous Fe-based coatings exhibited an attractive combination of high hardness (900-1100HV0.3) and superior bonding strength (44.9-54.8MPa). The coating at λn=0.21 had the lowest Gibbs free energy difference δG, exhibited the largest super-cooled liquid region δTx, Lu's criterion factor γ value and the heat of crystallization (δH) values, which indicating the highest GFA.

    Original languageEnglish
    Pages (from-to)118-124
    Number of pages7
    JournalMaterials and Design
    Volume78
    DOIs
    Publication statusPublished - 2015 Aug 5

    Keywords

    • Amorphous
    • Coating
    • Crystallization
    • Microstructure
    • Thermal spray

    ASJC Scopus subject areas

    • Materials Science(all)
    • Mechanics of Materials
    • Mechanical Engineering

    Fingerprint Dive into the research topics of 'Fabrication and characterization of Fe-based amorphous coatings prepared by high-velocity arc spraying'. Together they form a unique fingerprint.

    Cite this