Abstract
Self strengthening within one grain of ceramic matrix was examined. Non-equilibrium alumina solid-solution with chromia was fabricated from the rapid sintering by Pulsed Electric Current Sintering (PECS) method. Uniform and fine size of chromia was distributed into the composite powder through the precipitation of chromium nitrate using urea as media. The particle size of the distributed chromia was identified to be about 20 nm by TEM. Rapid sintering resulted in the fine microstructure with high strength of 1.2 GPa. Detailed microstructural examination was made by transmission electron microscopy. The distribution of Cr-solute in the alumina grain revealed that concentration gradient of Cr was developed in every grains of alumina matrix. The possible strengthening mechanism and new model of in-grain composites are suggested.
| Original language | English |
|---|---|
| Pages (from-to) | 521-526 |
| Number of pages | 6 |
| Journal | Key Engineering Materials |
| Volume | 161-163 |
| State | Published - 1999 |
Keywords
- Alumina
- Chromia
- Core-Shell
- Non-Equilibrium Solid Solution