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Utilizing the autocatalysis of Co to prepare low‐cost WC‐Co powder for high‐performance atmospheric plasma spraying
Author(s) -
Zhang Lei,
Yue Fen,
Li Shaofu,
Yang Yafeng
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.17192
Subject(s) - materials science , composite number , chemical engineering , plating (geology) , coating , particle size , autocatalysis , particle (ecology) , metallurgy , ternary operation , atmospheric pressure plasma , substrate (aquarium) , nanoparticle , fluidized bed , chemical vapor deposition , composite material , plasma , catalysis , nanotechnology , chemistry , biochemistry , oceanography , physics , organic chemistry , quantum mechanics , geophysics , computer science , engineering , programming language , geology
A novel method of incorporating fluidized bed chemical vapor deposition (FBCVD) with electroless plating was developed to effectively prepare the core‐shell structured WC‐Co composite powders. The Co nanoparticles decorated on the surface of WC particles by FBCVD acted as active catalysts for the subsequent electroless plating process. The particle size and quantity of the decorated Co particles determined the electroless plating rate but the particle size played more important role. For the conditions tested, the maximum electroless plating rate of 2.34 mg/g/min was obtained by using an optimal FBCVD pretreatment at 750°C for 3 minutes. WC‐12Co composite powders with a commercial composition widely used for atmospheric plasma spraying (APS) were efficiently prepared. The composite powders exhibited excellent suitability for APS by forming a homogenous Co‐W‐C ternary liquid stream. The APS coating is not only well‐bonded with the substrate but also consisted of hard nonequilibrium Co 3 W 3 C and W 2 C phases with a uniform distribution. Both remarkably improved the hardness and tribological properties of the APS coating.