A novel approach to fabricate WC reinforced WCu composites via MSC and infiltration method. (February 2023)

• Record Type: Journal Article
• Authors: Xu, Dang; Wei, Bangzheng; Chen, Ruizhi; Zhou, Rui; Yang, Jian; Chen, Pengqi; Cheng, Jigui
• Is Part Of: International journal of refractory metals & hard materials. Volume 111(2023)
• Publication Date: 2023-02
• Subjects: WCu composites -- WC@W core-shell structure -- MSC -- Infiltration -- Wear resistance; Heat resistant alloys -- Periodicals; Refractory materials -- Periodicals; Metallography -- Periodicals; Alliages réfractaires -- Périodiques; Matériaux réfractaires -- Périodiques; Métallographie -- Périodiques; Heat resistant alloys; Metallography; Refractory materials; Periodicals; Electronic journals; 669.73
• DOI: 10.1016/j.ijrmhm.2022.106100
• Languages: English
• ISSNs: 0263-4368

Abstract

Abstract: WC reinforced WCu composites have excellent wear resistance and high-temperature strength, and can replace conventional WCu composites in special applications. In this work, WCu composites with WC@W core-shell structure are fabricated through a novel microwave-heating salt-bath carbonization (MSC) and infiltration method, using graphite as the carbon source. The MSC behavior of W particles and the influence of the graphite content on the microstructure and properties of the WCu composites are investigated. The results show that WC is successfully coated on the surface of W particles by the MSC method. The addition of an appropriate amount of graphite to W powders can improve the high-temperature mechanical properties and wear resistance of the WCu composites. Compared with conventional WCu composites, the WCu composites with 0.9 wt% graphite have higher thermal conductivity (245 W/(m·K)), higher hardness (293.8 HV), higher bending strength (1089.4 MPa), and higher compressive strength (410 MPa|600 °C ). The addition of graphite also significantly improved the wear resistance of the WCu composites. The average coefficient of friction (CoF) and wear rates (WR) of WCu9 composites are 0.51 and 5.37 × 10 −6 mm 3 N −1 m −1, respectively. The WC reinforced WCu composites prepared in this work provide an excellent approach to improve the wear resistance and high-temperature properties of guide plates in guide devices. Highlights: A novel approach was explored to fabricate WC reinforced W-Cu composites byMSC and infiltration. In-situ synthesis of WC on the surface of W particles by MSC to obtain WC@W powders. In-situ introduction of WC improves the high-temperature properties and wear resistance of W-Cu composites.