Accession Number : ADA298635

Title :   A Study of Basic Mechanisms Involved in the Consolidation of Multiphase Nanostructured Materials.

Descriptive Note : Final rept. 15 Jul 93-15 Jul 94,

Corporate Author : CONNECTICUT UNIV STORRS DEPT OF METALLURGY

Personal Author(s) : Strutt, Peter R.

PDF Url : ADA298635

Report Date : 15 AUG 1995

Pagination or Media Count : 23

Abstract : Programmatic achievements made under contract NOOOl4-93-0997 include: (1) demonstrating that nanostructured WC-Co powder can be thermally sprayed to form nanostructured coatings on substrate materials using the High-velocity Oxyfuel method. (2) showing that the micro structural scale of the deposited n- WC/Co coatings compares with that of bulk consolidated material (200 nm.). (3) showing that chemical changes during actual thermal spraying are completely eliminated by using an experimental gun with a high chamber pressure. (4) discovering the existence of ultrafine cobalt precipitates in WC nanograins in bulk consolidated n-WC/Co. These nanoprecipites, which result from the intimate mixing of elements at the molecular level, are believed to be important in promoting fracture toughness. (MM)

Descriptors :   *CHEMICAL VAPOR DEPOSITION, *COATINGS, *THERMOCHEMISTRY, *POWDER METALLURGY, *COBALT, THERMAL PROPERTIES, MICROSTRUCTURE, MOLECULAR STATES, HIGH VELOCITY, THIN FILMS, HIGH PRESSURE, TOUGHNESS, SUBSTRATES, FRACTURE(MECHANICS), FUELS, DIFFRACTION, MIXING, GUNS, SINTERING, ULTRAFINES, HOT WORKING, PRECIPITATES, SPRAYERS.

Subject Categories : Physical Chemistry
      Coatings, Colorants and Finishes
      Metallurgy and Metallography
      Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE