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  1£ºAlthough high density and pure mullte material have been obtained from small laboratory batches of Al2O3 -SiO2 gel , using hot pressing as a consolidation route ,little attention has been paid in the literature to evaluate the parameters that control the over processing of mulilte gels.
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The  general mechanism for (coating degradation and substrate corrosion) (is characterized by) (an increase in electrolytc uptake ,development of microscopic porosity and an increase in ionic conductance in the coating followed by corrosion (an electrochemical process ) at the coating/metal inface).
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