Abstract
The factors governing the film-forming performance of pre-ceramic polygermanosiloxan (PGS) coatings for aluminum (Al) substrate surfaces were investigated. The coatings were prepared through the hydrolysis-dehydrochlorinating and dehydrating condensations-pyrolysis reactions of a sol-precursor solution consisting of N-[3-(triethoxysilyl)propyl]-4,5-dihydroimidazole, Ge(OC 2H 5) 4, water, CH 3OH, and HCl. Six factors were important in obtaining a good film: (1) the high spreadability of the sol solution on the Al surfaces: (2) the formation of organocpolygermanosiloxane at sintering temperatures of 150° C; (3) the pyrolytic conversion at 350°C into an amorphous PGS network structure in which the SiOGe linkages were moderately enhanced; (4) the persistence of only minimum amounts of organic by-products; (5) the non-crystalline phases; and (6) the formation of interfacial oxane bond between PGS and aluminum oxide.
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