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

被引：8
|
作者：
Sakata, Kazunori [1 ]
Nakano, Kosuke [2 ]
Miyahara, Hirofumi [2 ]
Matsubara, Yasuhiro [3 ]
Ogi, Keisaku [4 ]
机构：
[1] Fujikikosan Corp, Kitakyushu, Fukuoka, Japan
[2] Kyushu Univ, Fukuoka 812, Japan
[3] Kurume Natl Coll Technol, Kurume, Fukuoka, Japan
[4] Oita Natl Coll Technol, Oita, Japan
来源：
JOURNAL OF THERMAL SPRAY TECHNOLOGY | 2007年 / 16卷 / 5-6期
关键词：
cobalt-based self-fluxing alloy; flame spraying; hardness; microstructure; post heat treatment; wear-resistance;
D O I：
10.1007/s11666-007-9125-5
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
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.
引用
收藏
页码：991 / 997
页数：7
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