Characterization of ZrB2–TiC composites reinforced with short carbon fibers. Issue 14 (1st October 2020)

• Record Type: Journal Article
• Authors: Istgaldi, Hamid; Nayebi, Behzad; Ahmadi, Zohre; Shahi, Peyman; Shahedi Asl, Mehdi
• Is Part Of: Ceramics international. Volume 46:Issue 14(2020)
• Page Start: 23155
• Page End: 23164
• Publication Date: 2020-10-01
• Subjects: Solid solution -- ZrB2–TiC -- Spark plasma sintering -- Carbon fiber; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.06.095
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Solid solution formation, phase evolution, microstructure development, and mechanical behavior of ZrB2 –TiC composites with/without carbon fiber additive were investigated. Fully dense composites were manufactured by spark plasma sintering route under 40 MPa load at 1900 °C for 420 s. FESEM and XRD studies were carried out to unveil the densification and toughening mechanisms in the sintered specimens. Results showed that the addition of only 1 wt% short carbon fibers increased the hardness from 21.8 GPa to 23.5 GPa. Moreover, a 3 % enhancement in the indentation fracture toughness was also observed due to the incorporation of short carbon fibers. The in-situ formation of ZrC and TiB2 phases were identified and related to a chemical reaction between the ZrB2 and TiC constituents. The solid solution development between the ZrB2 matrix and the in-situ formed TiB2 was also proved by the microstructural observation and the shifted peaks of ZrB2 in the XRD patterns.