Organometallic Precursor Routes to Si-C-Al-O-N Ceramics
Final rept. 1 Jul 89-31 Mar 91,
RENSSELAER POLYTECHNIC INST TROY NY DEPT OF CHEMISTRY
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This report describes the results of a research program directed at the development of improved methods for the preparation of Si-C-Al-O-N ceramics using organometallic precursors. Two main approaches were employed in these studies, 1 co-pyrolysis of homogeneous mixtures of organosilicon and organoaluminum precursors and 2 pyrolysis of specially designed, single- component precursors containing both Si and Al. Depending on the choice of precursors and the pyrolysis atmosphere employed, nanocrystalline Beta-SiC2H- AlN and Si3N4AlN composites, 2H-SiCAlN solid solutions, and various crystalline SiAlON phases were obtained as final ceramic products after annealing at 1400-1800 C the initially amorphous pre-ceramic phases obtained on pyrolysis to 1000 C.
- Physical Chemistry