Journal
APPLIED SURFACE SCIENCE
Volume 257, Issue 4, Pages 1276-1281Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2010.08.047
Keywords
B-trichloroborazine; Vapor deposition; BN interphase; Mechanical properties
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Funding
- Chinese Academy of Sciences [A1320070102]
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Boron nitride thin films were deposited on silicon carbide fibers by chemical vapor deposition at atmospheric pressure from the single source precursor B-trichloroborazine (Cl(3)B(3)N(3)H(3), TCB). The film growth and structure, as a function of deposition temperature, hydrogen gas flow rate, and deposition time, were discussed. The deposition rate reaches a maximum at 1000 degrees C, then decreases with the increasing of temperature, and the apparent activation energy of the reaction is 127 kJ/mol. Above 1000 degrees C, gas-phase nucleation determines the deposition process. The deposited BN films were characterized by Raman spectroscopy, X-ray diffraction (XRD) and scanning electron microscopy (SEM). The effect of BN interphase on the mechanical properties of the unidirectional SiC fiber-reinforced SiC matrix (SiC/SiC) composites was also investigated. The results show that the flexural strength of SiC/SiC composites with and without coating is 276 MPa and 70 MPa, respectively, which indicates that BN interphase coating deposited from B-trichloroborazine precursor can effectively adjust the fiber/matrix interface, thus causing a dramatic increase in the mechanical properties of the composites. Crown Copyright (C) 2010 Published by Elsevier B. V. All rights reserved.
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