Creep Behavior of Polymer Precursor Derived Si3N4/SiC Nanocomposites
Quarterly rept. 1 Jul-Sep 30 2001
CALIFORNIA UNIV DAVIS DEPT OF CHEMICALENGINEERING AND MATERIALS SCIENCE
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The third quarter of FY2001 has been devoted to the determination of creep behavior of the one of the two categories of materials produced by this project-silicon nitridesilicon carbide micro-nano composite sintered by Spark Plasma Sintering SPS. The microstructural details highlight the characteristics of 1 existing of turbostratic graphite phase at the intergranular regions and 2 the non-equilibrium distribution of glassy phases. The creep curves show a distinct stage of steady state creep, and investigations under varied temperature and stress level show stress exponent of 0.7-2.0 and activation energy of about 400-800kJmol.
- Laminates and Composite Materials