AN APPROACH TO THE PREPARATION OF POWDERS, FIBERS, AND FILMS OF ULTRA-HIGH PURITY CERAMICS.
Abstract
Specifically selected organo-metallic compounds can be made which will decompose to form familiar ceramic materials such as the refractory borides, carbides, nitrides, and oxides. This approach provides unlimited flexibility in the selection of starting compounds because of the great variety of organic compounds available. The thermal decomposition of organo-metallic compounds in the vapor phase produces high purity, fine particle size powders, coatings and thin films, or fibers, by controlled pyrolysis conditions. Transition and rare earth metal alkoxides have been investigated. Compounds of the type M(OR)3 and M(OR)4 where M is Ti, Zr, Hf, Th, Y, Yb, and Dy, and various alkyl groups such as C4H9- and C5H11- have been studied. The metal-oxygen bond in these compounds is very stable and thermal decomposition is complete to the oxides. A method has been developed to produce on a continuous basis zirconia and hafnia with an average particle size of less than 100A and a purity of 99.9(5+) percent. Adherent coatings of refractory oxides on graphite have been made by thermal decomposition of the alkoxides at the substrate surface. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1964
- Accession Number
- AD0608043
Entities
People
- C. T. Lynch
- K. S. Mazdiyasni
Organizations
- Air Force Research Laboratory