Adhesivity of molecular sieve films on metal substrates

Films of silicalite-1, zeolite Y, and SAPO-5 were deposited on steel and copper substrates. The film adhesivity, thermal stability, and morphology of the zeolite films were studied. it is shown that the main factors determining the zeolite film mechanical properties are the interactions at the substrate-gel interface. On the other hand, the mechanism of film formation depends on the type of the initial gel and the substrate surface activity. In addition, the results obtained indicate that the substrate plastic deformation, i.e., the high density of substrate surface defects, is one of the dominant parameters for good film adhesivity and thermal stability. (C) Elsevier Science Inc. 1996