University of Illinois Urbana-Champaign

Modeling of interaction between densification mechanisms in powder compaction

Subramanian, Sankara J.; Sofronis, Petros

Permalink

https://hdl.handle.net/2142/112615

Description

Title
Modeling of interaction between densification mechanisms in powder compaction
Author(s)
  • Subramanian, Sankara J.
  • Sofronis, Petros
Issue Date
1999-05
Keyword(s)
  • Powder Compaction
  • Densification
Abstract
Sinter-forging is a common means of forming ceramic or inter-metallic components for modern technological applications such as advanced structural materials, magneti materials, thin ceramic layers on substrates and nanocomposites. Micrometer /nanometer-sized powders provide significant advantages in terms of reduced processing pressures/ temperatures and increased control over the final microstructure. Although extensive research in the past twenty years has identified and analyzed the individual mechanisms acting at the microscale during densification, no comparable progress has been made towards understanding the full spectrum of interactions between the mechanisms. In this paper, a micromechanical model of powder consolidation is presented. It accounts for the elastic and power-law creep deformation of the bulk material along with stress-driven diffusion on the interparticle contacts and curvature-driven surface diffusion along the pore surfaces. The finite element method is used to obtain the time-dependent deformation of the powder aggregate from which macroscopic quantities such as relative density, densification rate, and strain rate as well as microscopic quantities such as volumetric flux and pore surface curvature are calculated. Comparisons are made with existing models and experimental data from the consolidation of micron-sized Al2O3 and TiAl.
Publisher
Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report Name or Number
  • TAM R 907
  • 1999-6009
ISSN
0073-5264
Type of Resource
text
Language
eng
Permalink
http://hdl.handle.net/2142/112615
Sponsor(s)/Grant Number(s)
Energy Department DEFG02-91ER45439
Copyright and License Information
Copyright 1999 Board of Trustees of the University of Illinois

Owning Collections

Technical Reports - Theoretical and Applied Mechanics (TAM) PRIMARY
TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.