Materials Transactions Online

Materials Transactions, Vol.53 No.04 (2012) pp.681-689
© 2012 The Japan Institute of Metals

Influence of Substrate Temperature on Structure and Adhesion Strength of Fe-Cr-P-C Amorphous Coating Films Produced by Thermal Spraying Technique

Masahiro Komaki1, Tsunehiro Mimura1, Ryurou Kurahasi1, Hirotaka Odahara2, Kenji Amiya2, Yasunori Saotome2 and Tohru Yamasaki3

1Nakayama Steel Works, Ltd., R&D Division, Osaka 551-8551, Japan
2Institute for Materials Research, Kansai Center, Tohoku University, Himeji 671-2280, Japan
3University of Hyogo, Himeji 671-2280, Japan

The influence of the substrate temperature on the structure, the pore distribution, and the adhesion strength of Fe-10Cr-based amorphous coating films has been examined. The amorphous coating films have been produced by a thermal spraying technique using our developed cylindrical nozzle on SS400 substrates. The splat morphology of the sprayed particles changed drastically from an irregular splash shape to a disk shape at a transition temperature of about 325°C. When the substrate temperature increased to the transition temperature region, between 325 and 350°C, the porosity in the boundary regions between the sprayed coating films and the substrates drastically decreased to about 6%, which may be due to the drastic increase in the wettability of the sprayed particles accompanied with the change of morphology from the splashed shape to the disk shape. When the substrate temperature increased from the transition temperature of 325°C up to 400°C, the porosity decreased gradually, and the volume fraction of the amorphous phase increased with increasing substrate temperature, resulting in an increase in the adhesion strength up to about 15 MPa.

(Received 2011/08/24; Accepted 2012/01/23; Published 2012/03/25)

Keywords: iron-chromium-phosphorus-carbon, amorphous alloy, sprayed coating film, thermal spraying method, substrate temperature, adhesion strength

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