Accession Number : ADA305170

Title :   Creep Resistant Oxide Fibers.

Descriptive Note : Final rept. 21 Aug 91-21 Nov 93,

Corporate Author : MICHIGAN UNIV ANN ARBOR

Personal Author(s) : Halloran, John W. ; Laine, Richard M. ; King, Bruce H. ; Liu, Yin

PDF Url : ADA305170

Report Date : MAR 1994

Pagination or Media Count : 64

Abstract : Yttrium aluminate garnet ("YAG"-Y3Al5O12) fibers were fabricated by two methods: a sol-gel method and a carboxylate precursor method. Both methods yielded fine diameter fibers of dense, phase-pure YAG. Green fibers were continuously spun from the sol-gel system and the carboxylate systems. Sintering was done in a batch mode. The sol-gel fibers were fabricated from commercial oxide colloidal sols, mixed with water-soluble polymers. The sintered YAG fibers had excellent bend stress relaxation (BSR) creep resistance. The BSR creep temperature for the YAG fibers was increased by 220 deg C over DuPont's alumina-based PRD 166 fibers and 275 deg C over DuPont's Fiber FP alumina fibers. The room temperature strength of the sol-gel YAG fibers was 500-700 MPa, limited by processing defects. The fabrication, spinning, sintering, and YAG phase development are reported in detail. jg p10

Descriptors :   *FIBERS, *RESISTANCE, *OXIDES, *CREEP, YTTRIUM ALUMINUM GARNET, TEMPERATURE, WATER, POLYMERS, PRECURSORS, PROCESSING, BENDING, ROOM TEMPERATURE, DEFECTS(MATERIALS), SPINNING(INDUSTRIAL PROCESSES), ALUMINUM OXIDES, STRENGTH(GENERAL), COLLOIDS, BATCH PROCESSING, GREEN(COLOR), GARNET, FINE GRAINED MATERIALS, SINTERING, ALUMINATES, CREEP STRENGTH, STRESS RELAXATION, SOL GEL PROCESSES.

Subject Categories : Textiles
      Inorganic Chemistry
      Polymer Chemistry
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE