Microstructure control of thermally sprayed co-based self-fluxing alloy coatings by diffusion treatment

Kazunori Sakata, Kosuke Nakano, Hirofumi Miyahara, Yasuhiro Matsubara, Keisaku Ogi

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Abstract

This article describes microstructure control aimed for wear-resistance improvement of Co-based (Co-Cr-W-B-Si) self-fluxing alloy coating by diffusion treatment. The diffusion treatments of thermally sprayed Co-based self-fluxing alloy coating on steel substrate were carried out at 1370-1450 K for 600-6000 s under an Ar gas atmosphere. Microstructural variations of the coating and the interface between the substrate and the coating were investigated in detail. A proper diffusion treatment precipitates two kinds of fine compounds in Co-based matrix. X-ray diffractometer (XRD) and electron probe microanalyzer (EPMA) analysis revealed these precipitates to be a chromium boride dissolving cobalt and a tungsten boride containing cobalt and chromium. The size of each precipitate became larger with increasing treatment temperature and time. A coating with the proper size borides showed a superior wear-resistance.

Original languageEnglish
Pages (from-to)991-997
Number of pages7
JournalJournal of Thermal Spray Technology
Volume16
Issue number5-6
DOIs
Publication statusPublished - Dec 1 2007

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Materials Chemistry

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