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

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

doi:10.1007/s11666-007-9125-5

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

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

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

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 language	English
Pages (from-to)	991-997
Number of pages	7
Journal	Journal of Thermal Spray Technology
Volume	16
Issue number	5-6
DOIs	https://doi.org/10.1007/s11666-007-9125-5
Publication status	Published - Dec 2007

All Science Journal Classification (ASJC) codes

Condensed Matter Physics
Surfaces, Coatings and Films
Materials Chemistry

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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.",

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AU - Sakata, Kazunori

AU - Nakano, Kosuke

AU - Miyahara, Hirofumi

AU - Matsubara, Yasuhiro

AU - Ogi, Keisaku

PY - 2007/12

Y1 - 2007/12

N2 - 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.

AB - 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.

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

Abstract

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