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Synthesis, microstructure, and mechanical properties of TiC‐SiC‐Ti 3 SiC 2 composites prepared by in situ reactive hot pressing
Author(s) -
Liao Nan,
Xu Ludi,
Jin Yuxi,
Xiao Youtao,
Grasso Salvatore,
Hu Chunfeng
Publication year - 2020
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.13497
Subject(s) - materials science , microstructure , composite material , transgranular fracture , fracture toughness , hot pressing , flexural strength , composite number , titanium carbide , vickers hardness test , graphite , silicon carbide , intergranular fracture , intergranular corrosion , carbide
Abstract In this work, TiC‐SiC‐Ti 3 SiC 2 composites were synthesized by in situ reactive hot pressing using β‐SiC, graphite, and TiH 2 powders as initial materials. Microstructure and mechanical properties of as‐prepared dense composites were systematically investigated. It was found that by increasing the initial SiC content the final SiC content in the composites increased in contrast to the decrease in TiC and Ti 3 SiC 2 contents. In the dense composites, TiC and Ti 3 SiC 2 grains exhibited transgranular fracture, whereas SiC particles showed intergranular fracture. The composite containing 77 vol.% TiC, 4 vol.% SiC, and 19 vol.% Ti 3 SiC 2 had the highest flexural strength of 706.6 MPa. The composite consisting of 44 vol.% TiC, 49 vol.% SiC, and 7 vol.% Ti 3 SiC 2 exhibited the highest Vickers hardness of 22.3 GPa and the highest fracture toughness of 6.0 MPa·m 1/2 .