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Microstructure and Mechanical Properties of Three‐Dimensional Textile Hi‐Nicalon SiC/SiC Composites by Chemical Vapor Infiltration
Author(s) -
Xu Yongdong,
Cheng Laifei,
Zhang Litong,
Yin Hongfeng,
Yin Xiaowei
Publication year - 2002
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2002.tb00248.x
Subject(s) - materials science , composite material , chemical vapor infiltration , microstructure , charpy impact test , flexural strength , fracture toughness , composite number , brittleness , toughness , thermal expansion
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·m 1/2 . 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.