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