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More effective crack self‐healing capability of SiC f /SiC‐B 4 C with Al 2 O 3 modified under wet environment
Author(s) -
Shan Qingliang,
Xue Yudong,
Hu Jianbao,
Xu Qiankun,
Ma Qian,
Zeng Shenghui,
Lian Jiawei,
Wang Yewei,
Shui Anze
Publication year - 2020
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/jace.17371
Subject(s) - materials science , composite material , interphase , self healing , crystallization , phase (matter) , volatilisation , oxide , aluminium , reducing atmosphere , atmosphere (unit) , limiting , chemical engineering , metallurgy , medicine , mechanical engineering , chemistry , genetics , alternative medicine , physics , organic chemistry , pathology , engineering , biology , thermodynamics , nuclear physics
Aluminum oxide has been introduced into SiC f /(SiC + B 4 C) composites to improve the crack self‐healing property in O 2 /H 2 O atmosphere. The observation of the surface and interior morphologies of the oxidized composites reveal that Al 2 O 3 can lead to rapid self‐healing of cracks, which will effectively block the oxidation of interior interphase and fiber. Further investigation reveals that Al 2 O 3 plays an important role in impeding the crystallization of SiO 2 and limiting the volatilization of B 2 O 3 . It is beneficial to form self‐healing fluid glass phase and improve glass phase stability. Under these circumstances, the pre‐crack can be healed more effectively, which is advantageous for composites to remain high strength retention rate.