Research on the Microstructure and Properties of Multiple-dimensioned Cold Sprayed WC-Co Cermet Coatings

doi:10.3969/j.issn.1000-1093.2013.07.013

Abstract

Abstract: Three kind of multiple-dimensioned WC-Co cermet coatings were prepared by cold spraying of WC-12Co, WC-10Cr-4Cr and WC-17Co powders. The microstructure and phase structure of three kinds of multiple-dimensioned WC-Co coatings are analyzed. Their micro hardness, Young爷s modulus and fracture toughness are investigated, and the wear performances of three coatings are tested on a pin on disk tester. It was revealed that three cold sprayed multiple-dimensioned cermet coatings had dense microstructure and similar phase structure with that of feedstock powder. The allotropic transformation of metal Co occurred due to its intensive plastic deformation. The coatings have no lamellar structure of conventional thermal spraying coating and the WC particles in the coatings are distributed in a size range of micrometer, submicrometer and nanometer scale. Moreover, the micro hardness and Young's modulus ofcoatings decreased, fracture toughness and wear weight loss increased with increasing binder phase content. The wear mechanism was mainly the micro-cuts effect of abrasive particle on the coating surface.

Key words: material failure and protection, cold spraying, multiple-dimensioned, WC-Co, cermet coating, microstructure, properties

CLC Number:

TG115.5

WANG Hong-tao, CHEN Xiao, BAI Xiao-bo, JI Gang-chang, DONG Zen-xiang, YI Deng-liang, YANG Fen-geng. Research on the Microstructure and Properties of Multiple-dimensioned Cold Sprayed WC-Co Cermet Coatings[J]. Acta Armamentarii, 2013, 34(7): 876-882.

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