Accession Number : ADA208714

Title :   High Temp Toughening and Creep Studies.

Descriptive Note : Final rept. 1 Jun 85-28 Feb 89,

Corporate Author : ILLINOIS UNIV AT URBANA DEPT OF MATERIALS SCIENCE AND ENGINEERING

Personal Author(s) : Kriven, Waltraud M

PDF Url : ADA208714

Report Date : 11 May 1989

Pagination or Media Count : 128

Abstract : Early in 1985, the lanthanide sesquioxides (Ln2O3) were identified as potential high temperature transformation tougheners alternative to zirconia (ZrO2). their 8-10% volume increase accompanying the monoclinic (B) to cubic (C) transformation suggested that they should be more powerful than ZrO2. In addition, the Ms temperature was raised up to 2200 C indicating that, based on thermodynamics alone, transformation toughening up to this temperature should be possible. Hence a proposal was written with the aim of transformation toughening silicon carbide (SiC) with dispersions of monoclinic dysprosia particles giving a microstructure analogous to Zirconia-toughened-alumina (ZTA). Keywords: Composite materials; Cracking; Graphite; Sintering; Silica; Annealing; Silicon carbides. (kt)

Descriptors :   *COMPOSITE MATERIALS, *CHEMICAL REACTIONS, ANNEALING, CRACKS, CREEP, GRAPHITE, MICROSTRUCTURE, PARTICLES, SILICON CARBIDES, SILICON DIOXIDE, SINTERING, THERMODYNAMICS, ZIRCONIUM OXIDES, ALUMINUM

Subject Categories : Inorganic Chemistry
      Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE