The Formation of thin Films and Fibers of TiC from a Polymeric Titanate Precursor
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THE FORMATION OF THIN FILMS AND FIBERS OF TiC FROM A POLYMERIC TITANATE PRECURSOR S-J. Ting, C-J. Chu, E. Limatta, J. D. Mackenzie* and T. Getman, M. F. HawthorneDepartment of Materials Science and Engineering and ** Department of Chemistry and Biochemistry, University of California at Los Angeles, Los Angeles, CA 90024 ABSTRACT The synthesis and characterization of several polymeric titanates and their conversion to carbon deficient TIC is described. The physical properties of one of these titanates allows it to be drawn into fibers and applied to substrates as thin films. Pyrolysis of these fibers and films to carbon deficient TiC is described. INTRODUCTION The preparation of metallic carbides via metal-organic precursors is now well known [1-7]. However, while it is relatively easy to prepare ceramic carbide powders it is extremely difficult to fabricate fibers directly from the precursors. Titanium alkoxides are known to undergo transesterification [81 with carboxylic acid esters. This approach has been employed in the preparation of titanium alkoxides which could not be prepared via other routes [8]. The formation of polymeric titanium alkoxides via the transesterification of Ti(O-iC3H7)4 with bifunctional acetates and their subsequent pyrolysis to TiCx (x
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