Synthesis and properties of model SiC-Si3N4 interfaces
- 44 Downloads
Microscopic and macroscopic SiC-Si3N4 interfacial structures were synthesized and their properties examined. Microscopic interfaces were produced by hot isostatic pressing vapour-liquid-solid SiC whisker-polycrystalline Si3N4 matrix composites without densification aids. Macroscopic interfaces were formed by the chemical vapour deposited Si3N4 coating of large SiC single crystals. The characteristics of these model interfaces were investigated using transmission electron microscopy and indentation fracture. Results showed the microscopic interfaces to contain a small amount of second phase, while the macroscopic interfaces were pristine in nature with no second phase present. Pristine SiC-Si3N4 interfaces were strongly bonded at room temperature, but interfacial strength decreased at elevated temperatures.
KeywordsPolymer Microscopy Electron Microscopy Transmission Electron Microscopy Elevated Temperature
Unable to display preview. Download preview PDF.
- 5.O. Unal, PhD thesis, Case Western Reserve University (1991).Google Scholar
- 6.J. J. Petrovic and G. F. Hurley, in “Fiber Reinforced Ceramic Composites”, edited by K. S. Mazdiyasni (Noyes Publications, Park Ridge, New Jersey, 1990) p. 93.Google Scholar
- 7.S. R. Nutt and D. S. Phillips, in “Proceedings of the Conference on Interfaces in Metal-Matrix Composites”, New Orleans, March 1986, edited by A. K. Dhingra and S. G. Fishman (The Metallurgical Society, Warrendale, Pennsylvania, 1986) p. 111.Google Scholar
- 11.F. D. Gac, PhD thesis, University of Washington (1988).Google Scholar
- 15.J. A. Lely, Ber. Deut. Keram. Ges. 32 (1955) 229.Google Scholar