Improved toughness of HfC with tantalum fibre net and tantalum foil. Issue 13 (1st July 2021)

• Record Type: Journal Article
• Authors: Xiao, Peng; Wang, Song; Yu, Yiping; Fang, Bing; Li, Hao
• Is Part Of: Ceramics international. Volume 47:Issue 13(2021)
• Page Start: 19260
• Page End: 19266
• Publication Date: 2021-07-01
• Subjects: HfC ceramics -- Ta -- Laminated structure composites -- Fracture toughness; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.03.218
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Two kinds of Ta/HfC composites with laminated structure were fabricated by spark plasma sintering of a green body with alternately stacked HfC powder and Ta fibre net or foil layers. The composition, microstructure, and physical/mechanical properties of the Ta/HfC composites were investigated by XRD, SEM, EDS, and other techniques. The results revealed that cubic Ta and HfC were the main phases in the Ta/HfC composites, despite their partial reaction to form δ -TaC1-x (0 < x < 0.22), HfC1-y (0 < y < 0.4), and β -Ta2 C at the interface. The introduction of continuous Ta as the interlayers limited densification but improved the mechanical properties of HfC ceramics. Compared to Ta fibre net, Ta foil showed a better toughening effect; in particular, the flexural strength, fracture toughness, and rupture work of the Tafoil /HfC composites were 290 ± 29 MPa, 5.53 ± 1.59 MPa m 1/2, and 900 J/m 2, which were approximately 218%, 148%, and 543% higher than those of HfC, respectively.