Accession Number : ADA323558

Title :   Nanocrystalline Processing and Interface Engineering of Si3N4-Based Nanocomposites.

Descriptive Note : Progress rept. 1 Jan-31 Mar 97,

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

Personal Author(s) : Ying, Jackie Y.

PDF Url : ADA323558

Report Date : 01 APR 1997

Pagination or Media Count : 7

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. A SEM/BET study of the microstructure of the green bodies of the TiN materials was completed. A TGA/Mass Spectrometer study quantified the amounts and types of gases evolved during the heating of nano-TiN which had been exposed to air for various amounts of time. HIPing (hot isostatic pressing) experiments of our nano-TiN continued and demonstrated the potential for a reduction in the oxide content of the final, sintered materials. Modeling of the nitridation process of our Ti nanoclusters and a comparison of that system to the nitridation kinetics in the Si-Si3N4 system was performed.

Descriptors :   *MICROSTRUCTURE, *SYNTHESIS(CHEMISTRY), *NITRIDES, *TIN COMPOUNDS, *SINTERING, SCANNING ELECTRON MICROSCOPES, CRYSTAL STRUCTURE, ISOSTATIC PRESSING, MASS SPECTROMETERS, KINETICS, NANOTECHNOLOGY.

Subject Categories : Industrial Chemistry and Chemical Processing
      Crystallography
      Mfg & Industrial Eng & Control of Product Sys

Distribution Statement : APPROVED FOR PUBLIC RELEASE