Accession Number : ADA254183


Title :   Effect of Surface Forces on the Rheology of Particle-Liquid Systems and the Consolidation of Ceramic Powders


Descriptive Note : Annual rept. no. 2,


Corporate Author : CALIFORNIA UNIV SANTA BARBARA DEPT OF MATERIALS


Personal Author(s) : Lange, Fred F ; Pearson, Dale S


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a254183.pdf


Report Date : 31 Jan 1992


Pagination or Media Count : 73


Abstract : More reliable ceramics require improved processing reliability. Heterogeneities bought with powders and those inadvertently introduced during processing as well as non-uniform and undefined phase distributions contribute to unreliable processing. Colloidal powder treatments can eliminate many heterogeneities and ensure more uniform phase distributions. To ensure that new heterogeneities are not introduced, colloidally treated powders must be piped, as slurries, directly to a die cavity. Slurry consolidation methods based on particle partitioning, e.g., pressure filtration and centrifugation are emphasized in this review. Interparticle potentials play a dominant role in governing the slurry viscosity, maximum particle packing density and the rheology of the consolidated body. These roles will be reviewed with the objective to understand how damage free bodies can be consolidated from slurries to increase the structural rollability of ceramics and their composites.


Descriptors :   *POWDERS , *PROCESSING , *CERAMIC MATERIALS , *RHEOLOGY , *SLURRIES , STRESSES , DENSITY , AGING(MATERIALS) , FABRICATION , CAVITIES , RELIABILITY , DIE CASTING , CERAMIC BODIES , FILTRATION , COLLOIDS , VISCOSITY , PACKING DENSITY , PRESSURE , ALUMINUM OXIDES , PARTICLES , SURFACES , PHASE , TOUGHNESS , COMPOSITE MATERIALS , DAMAGE , DISTRIBUTION , LIQUIDS


Subject Categories : Ceramics, Refractories and Glass
      Laminates and Composite Materials
      Mfg & Industrial Eng & Control of Product Sys


Distribution Statement : APPROVED FOR PUBLIC RELEASE