1994 Fiscal Year Final Research Report Summary

Wear-Resistant and Corrosion-Resistant Amorphous Coating of High-Carbon Iron Alloy By Plasma Spraying

Research Project

Project/Area Number	04452273
Research Category	Grant-in-Aid for General Scientific Research (B)
Allocation Type	Single-year Grants
Research Field	金属加工(含鋳造)
Research Institution	Kyushu Institute of Technology
Principal Investigator	KISHITAKE Katsuhiko Kyushu Instute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (40029880)
Co-Investigator(Kenkyū-buntansha)	ERA Hidenori Kyushu Instute of Technology, Faculty of Engineering, Associtate Professor, 工学部, 助教授 (00127987)
Project Period (FY)	1992 – 1994
Keywords	plasma spraying / amorphous phase / high-carbon iron alloy / crystallization
Research Abstract	Fe-Cr-Mo alloys containing a large amount of carbon and/or boron were plasma sprayd under reduced pressure. All the sprayd coatings are amorphous and show a high hardness of 800 to 1000 DPN.The amophous coatings crystallize at about 773 K or more. Very fine carbides, borocarbides or borides precipitate in the matrix of chi phase and/or ferrite after crystallization of the amorphous phase ; bringing about a very high hardness of 1300 to 1450 DPN.The anodic polarization behavior of the as-sprayd amorphous coatings exhibits the activation-passivation transition in 1N H_2SO_4 solution. The active and passive current densities of the coatings increase with increasing boron content of the alloy. The corrosion resistance of the coating containing no boron is superior to SUS316L stainless steel coating.

(2 results)