Synthesis of Fine Co/ WC Composite and Application to Supersonic Plasma Spraying

Abstract:

Co/ WC composite powders (with 10 wt% content of Co) were synthesized by direct mechanical grinding in a rotary-vibration mill. The powders with different mill time were evaluated. WC and WC/Co composite coatings were prepared by supersonic plasma spraying. The results showed that the milled powders consist of composite particles that were formed in the first 2h of milling. Longer milling times improve the distribution of phases inside the composite particles. The formation of the composite particles involves sequential steps of deformation, fragmentation, cold welding, work hardening and piercing of particles of the hard phase in the soft phase. X-ray spectra of the sprayed coating are shown that only very weak W2C and Co6W6C peaks are observed. Compared with WC coating, the Co/ WC coating is denser, and less large pores within composite coating.

• Periodical: Advanced Materials Research (Volume 454)
• Pages: 110-113
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.454.110
• Online since: January 2012
• Authors: Lian Wei Yang, Rui Jie Wang, Yun Dong, Xiao Ping Lin
• Keywords: Composite Coating, Friction, Plasma Spraying, WC-Co, Wear

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