W-ZrC composites prepared by reactive melt infiltration of Zr2Cu alloy into partially carburized W preforms. (September 2017)

• Record Type: Journal Article
• Authors: Wang, Dong; Chen, Lei; Wang, Yu-Jin; Huo, Si-Jia; Ouyang, Jia-Hu; Zhou, Yu
• Is Part Of: International journal of refractory metals & hard materials. Volume 67(2017)
• Page Start: 125
• Page End: 128
• Publication Date: 2017-09
• Subjects: W-ZrC composite -- Reactive melt infiltration -- Partially carburized -- Microstructure -- Mechanical properties; 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.2017.05.005
• Languages: English
• ISSNs: 0263-4368

Abstract

Abstract: W-ZrC composites without residual WC have been prepared for the first time by reactive infiltration at 1300 °C for 1 h in vacuum using a molten Zr2 Cu alloy and a newly designed partially-carburized W powder as raw materials. The as-synthesized composites consist of two major phases of W and ZrC, in which the content of W is 65 vol%. The reaction time needed to produce a fully densified W-ZrC bulk ceramic is distinctly shortened by this means, as contrasted with conventional WC/W or WC preforms. The microstructural evolution during reactive melt infiltration is investigated to obtain a better understanding of reaction mechanisms and mechanical properties of the W-ZrC composites derived by infiltrating Zr2 Cu alloy into partially carburized W preforms. The flexural strength, Young's modulus and fracture toughness for the W-ZrC composite are 554 MPa, 339 GPa and 9.7 MPa·m 1/2, respectively. Highlights: W-ZrC composites without residual WC were prepared by infiltrating molten Zr2 Cu into partially carburized W preforms. The reaction time needed to produce a fully densified W-ZrC bulk ceramic is distinctly shortened. The flexural strength and fracture toughness for the W-ZrC composite are 554 MPa and 9.7 MPa·m 1/2, respectively.