Microstructure and mechanical properties of three-dimensional textile Hi-Nicalon SiC/SiC composites by chemical vapor infiltration

Yongdong Xu, Laifei Cheng, Litong Zhang, Hongfeng Yin, Xiaowei Yin

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Three-dimensional textile Hi-Nicalon SiC-fiber-reinforced SiC composites were fabricated using chemical vapor infiltration. The microstructure and mechanical properties of the composite materials were investigated under bending, shear, and impact loading. The density of the composites was 2.5 g·cm-3 after the three-dimensional SiC perform was infiltrated for 30 h. The values of flexural strength were 860 MPa at room temperature and 1010 MPa at 1300°C under vacuum. Above the infiltration temperature, the failure behavior of the composites became brittle because of the strong interfacial bonding and the mismatch of thermal expansion coefficients between fiber and matrix. The fracture toughness was 30.2 MPa·m1/2. The obtained value of shear strength was 67.5 MPa. The composites exhibited excellent impact resistance, and the dynamic fracture toughness of 36.0 kJ·m-2 was measured using Charpy impact tests.

Original languageEnglish
Pages (from-to)1217-1221
Number of pages5
JournalJournal of the American Ceramic Society
Volume85
Issue number5
DOIs
StatePublished - May 2002

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