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Process and Mechanical Properties of in Situ Silicon Carbide‐Nanowire‐Reinforced Chemical Vapor Infiltrated Silicon Carbide/Silicon Carbide Composite
Author(s) -
Yang Wen,
Araki Hiroshi,
Kohyama Akira,
Thaveethavorn Somsri,
Suzuki Hiroshi,
Noda Tetsuji
Publication year - 2004
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.1551-2916.2004.01720.x
Subject(s) - nanowire , materials science , silicon carbide , composite number , composite material , ceramic matrix composite , nanometre , carbide , toughness , fracture toughness , silicon , nanotechnology , metallurgy
A SiC nanowire/Tyranno‐SA fiber‐reinforced SiC/SiC composite was fabricated via simple in situ growth of SiC nanowires directly in the fibrous preform before CVI matrix densification; the purpose of the SiC nanowires was to markedly improve strength and toughness. The nanowires consisted of single‐crystal β‐phase SiC with a uniform ∼5 nm carbon shell; the nanowires had diameters of several tens to one hundred nanometers. The volume fraction of the nanowires in the fabricated composite was ∼5%. However, the composite did not show significant increase in strength and toughness, likely because of strong bonding between the nanowires and the matrix caused by the very thin carbon coating on the nanowires. Little debonding and pullout of SiC nanowires from the matrix were observed at the fracture surfaces of the composite.