Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 41, Issue 3, Pages 1788-1794Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2020.10.053
Keywords
Ceramic-matrix composites; Ultra-high temperature ceramics; HfC; Reactive melt infiltration; Interphase
Categories
Funding
- National Natural Science Foundation of China [51702341]
- CAS Pioneer Hundred Talents Program
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During the fabrication process of 3D-C-f/HfC-SiC composites, erosion of fibers and interphase is a major issue due to reactions between HfO2 and C/SiC interphase layers at high temperatures. By implementing a two-step carbothermal reduction treatment, the erosion of fibers/interphase can be reduced and mechanical properties of the composites can be improved.
In this work, 3D-C-f/HfC-SiC-based composites were fabricated and optimized via reactive melt infiltration (RMI) of Si into porous C-f/HfC-C preforms prepared by a sol-gel processing. The physical and chemical processes involved during the fabrication were identified and analyzed in details. It is revealed that fibers and interphase of the composites can be eroded during carbothermal reduction process, which can be further aggravated during RMI, with the formation of Hf-containing substance on the fibers surface. The fibers and interphase degradation is mainly induced by the reactions between HfO2 and C/SiC interphase layers at elevated temperatures. Accordingly, a two-step carbothermal reduction treatment was proposed for the optimization of the fabrication procedure. As a result, less fiber/interphase erosion and improved mechanical properties are achieved in the composites, with the bending strength increased by similar to 49 % (from 214.1 +/- 15.7 MPa to 319.0 +/- 26.0 MPa).
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