Creep Behavior of Polymer Precursor Derived Si3N4/SiC Nanocomposites

Abstract

Two batches of plasma sprayed zirconia-alumina-spinel powder (with or without high energy ball milling (HEBM)) were consolidated to full density by spark plasma sintering (SPS). The resulting nanocomposite showed superplasticity with a high activation energy of 945 kJ/mol for the HEBMed batch; the absence of HEBM treatment resulted in no superplastic behavior. The special grain boundary formed during SPS from nucleation and growth of new phases from metastable matrix in plasma sprayed powder is believed the key microstructure to turn this superplastic triphase ceramics into a non-superplastic one. If TEM analysis currently in process proves our postulation plasma spraying may be a potential technique to make intrinsically creep-resistant microstructures.

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Document Details

Document Type
Technical Report
Publication Date
Aug 26, 2004
Accession Number
ADA426308

Entities

People

  • Amiya K. Mukherjee
  • Dustin M. Hulbert
  • Joshua D. Kuntz
  • Rajendra K. Sadangi
  • Xinzhang Zhou

Organizations

  • University of California, Davis

Tags

DTIC Thesaurus Topics

  • Boundaries
  • Cellular Structures
  • Ceramic Matrix Composites
  • Composite Materials
  • Energy
  • Grain Boundaries
  • Heat Of Activation
  • High Energy
  • Materials
  • Materials Engineering
  • Materials Processing
  • Materials Science
  • Mechanical Properties
  • Nanocomposites
  • Nanoparticles
  • Plasma Spraying
  • Thermal Spraying

Fields of Study

  • Materials science

Readers

  • Plasma Physics.
  • Powder metallurgy of Titanium alloys.