Accession Number : AD0635587

Title :   DETERMINATION OF THE FEASIBILITY OF FORMING REFRACTORY FIBERS BY A CONTINUOUS PROCESS.

Descriptive Note : Final rept. 25 Feb 63-14 Jun 65.

Corporate Author : LEXINGTON LABS INC CAMBRIDGE MASS

Personal Author(s) : CAMPBELL, William B.

Report Date : JUN 1966

Pagination or Media Count : 85

Abstract : The feasibility of forming whiskers by vapor phase reaction was demonstrated. Whiskers of several materials were grown by oxidation (or reduction) and deposition from the vapor phase, including A1203, Si3N4, SiO2 and B. Principal effort was directed at producing whiskers A12O3 utilizing the reaction: 2A1C13(g) + 3CO2(g) + 3H2(g) reversibly yields A12O3(s) + 6CH1(g) + 3CO(g). Whiskers were grown on stationary substrates and gas-borne nuclei, although limited success was achieved with the latter. Whisker diameter appeared related to the grain size of the substrate or nuclei. High quality whiskers were produced by the process in terms of strength and length to diameter ratio. Measured mechanical properties compared very favorably with reported values obtained from whiskers formed by other processes. A special apparatus was developed for determining mechanical properties. The halide vapor reaction process appears amenable to high production rates because of the potential for continuous production techniques when compared to the batch production processes used presently. Purity and perfection are readily controllable. (Author)

Descriptors :   (*REFRACTORY MATERIALS, FIBERS), (*WHISKERS(CRYSTALS), REFRACTORY MATERIALS), (*CERAMIC FIBERS, MATERIAL FORMING), ALUMINUM COMPOUNDS, OXIDES, VAPOR PLATING, CRYSTAL GROWTH, SINGLE CRYSTALS, OXIDATION, CHLORIDES, HALIDES, THERMOCHEMISTRY, VAPORS, PROCESSING

Subject Categories : Ceramics, Refractories and Glass
      Refractory Fibers
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE