Microwave Assisted Self-Propagating High-Temperature Synthesis for Joining SiC Ceramics and SiC/SiC Composites by Ni-Al System

Abstract:

Microwave has been applied to ignite the Self-propagating High-temperature Synthesis (SHS) of compacted Ni-Al mixtures, having 1:1 atomic ratio, in order to join Chemical Vapor Deposition (CVD) SiC ceramics and SiC/SiC composites. The average joint thickness of CVD SiC joint is about 200 μm and the Coefficient of Thermal Expansion (CTE) mismatch between CVD SiC and Ni-Al intermetallic compounds results in a interface bond strength inferior to that of the substrate and joining material; on the other hand, for the SiC/SiC composite joints, as a result of the porosity of SiC/SiC composites, the SHS products readily infiltrated into the pore spaces of the composite, leading to an increased porosity of the joint area and a better lower interface than the upper one. The mechanical strength of the joints has been evaluated by Single-Lap (SL) shear test at room temperature; neither of the ceramic joints nor the composites joint gave satisfactory results, but the ceramic joints reaching a maximum shear strength value of 56MPa exhibited a positive aspect for further experiments.

• Periodical: Applied Mechanics and Materials (Volumes 727-728)
• Pages: 213-218
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.727-728.213
• Online since: January 2015
• Authors: Shao Hua Han*, Roberto Rosa, Valentina Casalegno, Milena Salvo, Paolo Veronesi, Monica Ferraris, Cristina Leonelli
• Keywords: CVD SiC Ceramics, Joining, Microwave, Ni-Al System, Self-Propagating High-Temperature Synthesis, SiC/SiC Composite

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