Accession Number:

ADA265135

Title:

Nanophase and Nanocomposite Materials. Materials Research Society Symposium Proceedings Held in Boston, Massachusetts on December 1-3, 1992. Volume 286

Descriptive Note:

Corporate Author:

MATERIALS RESEARCH SOCIETY PITTSBURGH PA

Report Date:

1992-01-01

Pagination or Media Count:

454.0

Abstract:

Ultrafine particles UFPs of aluminum oxide, formed by arc discharge, were sintered in an ultrahigh vacuum UHV furnace system and characterized by high resolution electron microscopy HREM under UHV conditions. The UFPs produced range in size from 20 to 50 nm and have highly faceted surfaces. The atomic structure of the UFPs corresponds to the cubic gamma and orthorhombic delta variants of the spinel structure. In UFPS, surface faceting plays a major role in determining the final sintering geometry with sintering occurring predominantly on the closed-packed 111 facets. Surface diffusion is the predominant mechanism for sintering, as evidenced by the fact that many sintered particles have their initial adhesion structure locked in during sintering with no reorientation occurring. Furthermore, the necks formed during sintering have well-defined, atomically-sharp contact angles suggesting that the neck growth process is controlled by the faceted structures and may be modeled by a mechanism similar to crystal growth due to ledges, grain boundaries, and twins. The driving force for sintering can be considered as a chemical potential difference between facet surfaces and the neck region.

Subject Categories:

  • Physical Chemistry
  • Ceramics, Refractories and Glass
  • Laminates and Composite Materials
  • Crystallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE