Effects of Ni60WC25 powder content on the microstructure and wear properties of WCp reinforced surface metal matrix composites
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The vacuum evaporative pattern casting technique was used to fabricate WCp reinforced surface metal matrix composites in order to study the effects of Ni60WC25 powder content on the microstructure and wear properties of it. The results showed that the Ni60WC25 powders weakened the stability of WC particles and reacted with metal matrix at the interfacial regions in the composite. Diffusion kinetics and Gibbs free energy were calculated from the interactions between WC particles and matrix. It was found that adding 35 vol% Ni60WC25 alloy powder to composites led to the formation of Fe3W3C phases and complete dissolution of WC particles. The wear properties of composites with different Ni60WC25 alloy powder content were tested by the MLD-10 type tester. WC particles and Fe3W3C phases could protect the matrix and the matrix could support WC particles and Fe3W3C phases during wear processing.
KeywordsParticle-reinforced composites Interfacial reaction Vacuum evaporative pattern casting (V-EPC) Abrasive wear
This work was supported by the National Natural Science Foundation of China (Nos. 51571103, 51561018, 51501079), China Postdoctoral Science Foundation (Nos. 2017M623319XB, 2018T110999), Yunnan Provincial Department of Education Science Research Fund Project (No. 2018JS033), and The Analysis and Testing Foundation of Kunming University of Science and Technology.
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