Effect of Organoalumoxanes on the Microstructure and Density of Al₂O_3f/Al₂O₃ Composites

We describe binders and impregnating mixtures based on chelated organoalumoxanes, which are used as precursors to highly thermally stable matrices and protective coatings. Using the polymer impregnation and pyrolysis (PIP) process, we have fabricated Al₂O_3f/Al₂O₃ ceramic-matrix composites. Ceramic micropowders resulting from pyrolysis of the precursors have been shown to have an advantageous effect on the microstructure and properties of the material. We have studied the microstructure and density of Al₂O_3f/Al₂O₃ composites produced using chelated organoalumoxane-based binders and impregnating mixtures. The relative density of the composites, 3.1 g/cm³, considerably exceeds the initial density of the porous preform: 2.5 g/cm³.