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Interphase degradation of three‐dimensional C f /SiC–ZrC–ZrB 2 composites fabricated via reactive melt infiltration
Author(s) -
Chen Xiaowu,
Feng Qian,
Gao Le,
Zhang Xiangyu,
Dong Shaoming,
Wang Jingxiao,
Zhong Qiang,
Kan Yanmei,
Ni Dewei
Publication year - 2017
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.14983
Subject(s) - interphase , materials science , composite material , degradation (telecommunications) , ceramic , ceramic matrix composite , composite number , chemical vapor infiltration , carbon fibers , infiltration (hvac) , chemical engineering , telecommunications , genetics , computer science , biology , engineering
Layer‐structured interphase, existing between carbon fiber and ultrahigh‐temperature ceramics ( UHTC s) matrix, is an indispensable component for carbon fiber reinforced UHTC s matrix composites (C f / UHTC s). For C f / UHTC s fabricated by reactive melt infiltration ( RMI ), the interphase inevitably suffers degradation due to the interaction with the reactive melt. Here, C f /SiC–ZrC–ZrB 2 composite was fabricated by reactive infiltration of ZrSi 2 melt into sol‐gel prepared C f /B 4 C–C preform. (PyC–SiC) 2 interphase was deposited on the fiber to investigate the degradation mechanism under ZrSi 2 melt. It was revealed that the degraded interphase exhibited typical features of Zr aggregation and SiC residuals. Moreover, the Zr species diffused across the interphase and formed nanosized ZrC phase inside the fiber. A hybrid mechanisms of chemical reaction and physical melting were proposed to reveal the degradation mechanism according to characterization results and heat conduction calculations. Based on the degradation mechanism, a potential solution to mitigate interphase degradation is also put forward.