Effect of interfacial residual thermal stress on the fracture behavior of Cf/B4C composites prepared by spark plasma sintering. Issue 4 (March 2020)

• Record Type: Journal Article
• Authors: Chen, Huan; Zeng, Fanhao; Li, Wenjie; Li, Lei; Wang, Ziwei; Liu, Honghao; Peng, Yirui; Gu, Yi; Zhang, Fuqin
• Is Part Of: Ceramics international. Volume 46:Issue 4(2020)
• Page Start: 4587
• Page End: 4594
• Publication Date: 2020-03
• Subjects: Cf/B4C composites -- Raman spectroscopy -- Interfacial residual thermal stress -- Spark plasma sintering -- Finite element simulation; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.10.188
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Carbon fiber reinforced boron carbide (Cf/B4 C) composites were fabricated with different Cfs contents by spark plasma sintering (SPS). The interfacial residual thermal stress (RTS) distribution in the Cf/B4 C composites and its effects on the fracture behavior of the composites was investigated based on Raman spectroscopy and finite-element (FE) calculation. The results show that the maximum RTS of Cf in as-produced composites were obtained at the edge of fibers. The B4 C matrix among fibers suffered a high compressive and tensile RTS simultaneously in radial and tangential directions, which caused the formation of micro-cracks and became the origin of fracture failure of the Cf/B4 C composites. The maximum relative density 98.7% and bending strength of 391.41 MPa were obtained when the Cf content was 2.5% while the maximum fracture toughness of 5.46 MPa·m 1/2 at 5% Cf content of Cf/B4 C sample. The sharp decreases of bending strength when increasing content of Cf cloth was mainly caused by high RTS in the composites.