Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 498, Issue 1-2, Pages 19-30Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2007.11.150
Keywords
Metallic glass; Brazing; C-C composite; C-SiC composite; SiC-SiC composite; Scanning electron microscopy; Energy dispersive spectroscopy; Knoop microhardness
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Carbon-carbon, carbon-silicon carbide, and silicon carbide-silicon carbide composites were vacuum brazed to Ti and Hastealloy X using Ni-base metallic glass braze foils (MBF-20 and MBF-30). Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) of the joints showed that compositional changes due to substrate dissolution led to secondary-phase precipitation which aided interfacial bonding although inter-laminar shear failure occurred within some composites. Residual thermal stresses in the joint led to hardness gradients; however, stress accommodation by the brazes prevented interfacial cracking. The peak Knoop microhardness in the joints was as high as 1165-1294 KHN. (C) 2008 Elsevier B.V. All rights reserved.
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