Microstructure and wear behavior of WC-30WB-10Co cemented carbide coating sprayed by HVOF
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Numerous studies have been made to enhance the wear resistance of WC-Co coatings deposited by HVOF during the lastfew years. Spherical WC-30WB-10Co powders were firstly fabricated by agglomeration and sintering process, which werethen employed to deposit coating by HVOF. The morphologies, phase composition, hardness, as well as sliding wear performanceof the as-deposited coatings were explored. The same experiments were carried out on traditional WC-12Co coatingswith the purpose of making the comparison. The results showed that the CoWB compound was formed through the reactionbetween Co and WB in the sintering process of the WC-30WB-10Co powders. The diffraction peaks of W2C, Co3W3C andCo6W6C were found in the XRD patterns of both coatings, implying that oxidation and decarburization happened in thespraying process of both powders. In relative to the traditional WC-12Co coating, the microhardness and wear resistance ofthe WC-30WB-10Co coating were greatly enhanced. Obviously, with the microhardness of the WC-30WB-10Co coating beingelevated by 34.1%, the wear rates were only 49.3% of that of WC-12Co coatings. This was resulted from the existence ofthe superhard CoWB phase in the WC-30WB-10Co coating. The wear mechanisms of both coatings were abrasive wear andoxidative wear.
Abstract
Numerous studies have been made to enhance the wear resistance of WC-Co coatings deposited by HVOF during the lastfew years. Spherical WC-30WB-10Co powders were firstly fabricated by agglomeration and sintering process, which werethen employed to deposit coating by HVOF. The morphologies, phase composition, hardness, as well as sliding wear performanceof the as-deposited coatings were explored. The same experiments were carried out on traditional WC-12Co coatingswith the purpose of making the comparison. The results showed that the CoWB compound was formed through the reactionbetween Co and WB in the sintering process of the WC-30WB-10Co powders. The diffraction peaks of W2C, Co3W3C andCo6W6C were found in the XRD patterns of both coatings, implying that oxidation and decarburization happened in thespraying process of both powders. In relative to the traditional WC-12Co coating, the microhardness and wear resistance ofthe WC-30WB-10Co coating were greatly enhanced. Obviously, with the microhardness of the WC-30WB-10Co coating beingelevated by 34.1%, the wear rates were only 49.3% of that of WC-12Co coatings. This was resulted from the existence ofthe superhard CoWB phase in the WC-30WB-10Co coating. The wear mechanisms of both coatings were abrasive wear andoxidative wear.
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