AVS 49th International Symposium
    Surface Engineering Tuesday Sessions
       Session SE+NS-TuM

Paper SE+NS-TuM6
Preparation and Characterization of Chemically Bonded Si@sub 3@N@sub 4@ and TiN Nanocomposites Prepared by Mechanical Alloying and Sintering

Tuesday, November 5, 2002, 10:00 am, Room C-111B

Session: Nanocomposite and Nanolayered Coatings
Presenter: S.W. Deore, Lamar University
Authors: S.W. Deore, Lamar University
M. Kesmez, Lamar University
M.A. Hossain, Lamar University
J.R. Parga, Instituto Technologico de Saltillo, Mexico
D.L. Cocke, Lamar University
Correspondent: Click to Email
Mechanical alloying using high-energy ball milling is a promising materials processing technique to synthesize nanocomposites for superior mechanical and chemical properties. However, the need to sinter, the application of heat to a powder or a powder body, to increase interparticle bonding, and usually density, tends to result in the destruction of the nanosized components. We have been examining the use of chemical binders that can be pyrolyzed to ceramic binding components at lower temperatures. The heating regime for the sintering process has been determined from the DSC analysis of the binders. Silicon nitride and titanium nitride nanocomposite powders have been prepared using high energy SPEX milling in a nitrogen atmosphere. The composites have been characterized using XRD, XPS, FTIR and SEM. Although both solid phase and liquid phase binders have been examined for their binding properties and hence, the properties of the obtained nanocomposites. The preferred characteristics of the binder precursors will be discussed and a major problem of wetting of the binder to the nanoparticles encountered will be delineated.