Microwave Joining of Si SiC Al Si SiC

Microwave energy is used to join high dielectric loss Si-SiC to Si-SiC with Al foil as an interlayer. Rapid heating with moderate applied pressure has led to excellent bond strength in a short time. The joining was successfully achieved in about 5 minutes at 1250 deg C and 1.2 MPa axial pressure in...

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Bibliographic Details
Main Authors: Yiin, T. Y, Varadan, V. V, Varadan, V. K, Conway, J. C
Format: Report
Language:English
Subjects:
ALUMINUM FOIL
BENDING
CAVITIES
CERAMIC MATERIALS
Ceramics, Refractories and Glass
Component Reports
DIELECTRICS
DIFFUSION
ELECTRON MICROSCOPY
ELECTRONS
ENERGY
HEATING
HIGH STRENGTH
INTERFACES
JOINING
LOSSES
MICROPROBES
MICROSCOPY
MICROWAVES
PRESSURE
Radiofrequency Wave Propagation
SCANNING
SILICON
SILICON CARBIDES
SINTERING
SYMPOSIA
TEST AND EVALUATION
WAVEGUIDES
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Summary:Microwave energy is used to join high dielectric loss Si-SiC to Si-SiC with Al foil as an interlayer. Rapid heating with moderate applied pressure has led to excellent bond strength in a short time. The joining was successfully achieved in about 5 minutes at 1250 deg C and 1.2 MPa axial pressure in a single mode microwave cavity without damaging the samples. The joined specimen interfaces were examined using optical microscopy and scanning electron microscopy. The diffusion paths of Al were also detected with electron microprobe image mapping. Average fracture strength of the joined specimen was shown to be comparable to the original material strength using the four point bending fracture test. Comparison of Weibull plots for original and joined Si-SiC has also verified the high strength at the Si-SiC/Al/Si-SiC interface. This article is from 'Ceramic Transactions. Volume 21. Proceedings of the Symposium on Microwave Theory and Application in Materials Processing Annual Meeting of the American Ceramic Society (23rd) Held in Cincinnati, Ohio on April 29 - May 3, 1991,' AD-A253 631, p507-514.