Accession Number : ADA319430

Title :   Nanocrystalline Processing and Interface Engineering of Sisub3Nsub4-Based Nanocomposites.

Descriptive Note : Technical rept. 1 Oct-31 Dec 96,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF CHEMICAL ENGINEERING

Personal Author(s) : Ying, Jackie Y.

PDF Url : ADA319430

Report Date : 01 JAN 1997

Pagination or Media Count : 4

Abstract : With careful powder handling procedures and processing, the nanocrystalline TIN produced in our novel reactor undergoes tremendous sintering and densification to produce dense (99%) TIN materials at 1400 deg C in a simple, pressureless sintering process This report outlines our continued work on the synthesis, sintering and processing of nanocrystalline TiN. Improvements to the filter collection unit in our reactor continue to be made. An SEM/XRD grain size study of the microstructure which develops in the unexposed, sintered TiN materials has shown that our final densified TiN is nanostructured (grain size 140 nm) and that up to 1200 deg C, the grain size remains under 35 nm. An oxidation study of these nanocrystalline nitride powders demonstrates further the importance of careful powder handling procedures to prevent easy oxidation of these materials in air.

Descriptors :   *CHEMICAL ENGINEERING, *SILICON NITRIDES, *NANOTECHNOLOGY, DENSITY, MICROSTRUCTURE, SYNTHESIS, INTERFACES, MATERIALS, POWDERS, GRAIN SIZE, OXIDATION, PRESSURE, TIN, FILTERS, HANDLING, COLLECTION, SINTERING.

Subject Categories : Industrial Chemistry and Chemical Processing

Distribution Statement : APPROVED FOR PUBLIC RELEASE