Preparation and tensile behavior of SiCf/SiC mini composites containing different types and thicknesses of interphase. Issue 14 (1st October 2020)

• Record Type: Journal Article
• Authors: Wang, Haoran; Chen, Zhaoke; Zhang, Ruiqian; He, Zongbei; Wu, Yan; Chen, Yihan; Xiong, Xiang
• Is Part Of: Ceramics international. Volume 46:Issue 14(2020)
• Page Start: 22297
• Page End: 22306
• Publication Date: 2020-10-01
• Subjects: Chemical vapor infiltration (CVI) -- Interphase -- Tensile behavior -- SiCf/SiC mini Composites; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.05.309
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: SiC fiber-reinforced SiC matrix (SiCf /SiC) composites are promising materials for high-temperature structural applications. In this study, KD-II SiC fiber bundles with a C/Si ratio of approximately 1.25 and an oxygen amount of 2.53%, were used as reinforcement. PyC interphase, PyC-SiC co-deposition interphase I and II, with different thicknesses, and SiC matrix were deposited into the SiC fiber bundles by using chemical vapor infiltration (CVI) to form SiCf /SiC mini composites. When the thickness of the interphase is approximately 1000 nm, the ultimate tensile stress and strain of SiCf /SiC mini composites with PyC-SiC co-deposition interphase I can reach 1120.0 MPa and 0.72%, respectively, which are significantly higher than those of SiCf /SiC mini composites with a PyC interphase (740.0 MPa, 0.87%) and PyC-SiC co-deposition interphase II (645.0 MPa, 0.54%). The effect of thicknesses and types of interphase on tensile fracture behavior of mini composites and then the fracture mechanism are discussed in detail.