Preparing WC–Co–Cr3C2–VC Nanocomposite Powders from Precursors
WC–Co–Cr3C2–VC nanocomposite powders were prepared by a new precursor method, in which the amorphous oxides-C mixtures were first produced from salt solution containing tungsten, cobalt, vanadium, chromium and carbon elements by air drying and subsequent calcining at 350 °C for 1 h, and secondly reduced and carbonized at 900–1100 °C for 2 h. The nanocomposite powders were characterized by means of XRD and SEM. The results show that the amorphous oxides-C mixtures contribute to reduction of synthesis temperature. During the whole process of powder synthesis, Co element reacts easily with W and C elements to form phases (such as Co3W3C, Co6W6C). At 1100 °C for 2 h, the pure-phased WC–Co–Cr3C2-VC nanocomposite powders with granular particle of ∼100–200 nm were obtained. The WC/Co sintered alloy using WC–Co–Cr3C2-VC nanocomposite powders as starting materials exhibits ultrafine grain sizes, in comparison with the reference alloy using traditional milled powders.
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Document Type: Research Article
Publication date: August 1, 2013
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