Nanocrystalline Processing and Interface Engineering of Si3N4-based Nanocomposites

Abstract

This report describes the microstructural characterization of nanocrystalline titanium nitride (TiN) produced in our forced flow reactor. Microscopy studies of TiN densified through a pressureless sintering process show a consistent ultrafine microstructure with grains of 140 nm and no glassy intergranular or secondary phases. Comparison of TiN ceramics processed by different methods demonstrates that there is a clear benefit to avoiding exposure of the starting powders to air, but that pressure application during sintering (e.g., by HIPing at 200 MPa) was not necessary to achieve full densification at 1400 deg C. STEM analysis of a fully-dense UN800 TiN ceramic found no oxygen-rich regions in the grains or grain boundaries.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1997
Accession Number
ADA330949

Entities

People

  • Jackie Y. Ying

Organizations

  • Massachusetts Institute of Technology

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Boundaries
  • Chemical Engineering
  • Electron Microscopy
  • Engineering
  • Grain Boundaries
  • Grain Size
  • Hardness
  • Materials
  • Mechanical Properties
  • Microscopy
  • Microstructure
  • Particle Size
  • Particles
  • Powders
  • Sintering
  • Transmission Electron Microscopy
  • Ultrafines

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.