Paper Title:
Densification Mechanism of MgAl2O4 Spinel during Spark-Plasma-Sintering
  Abstract

The densification mechanism during the park-plasma-sintering (SPS) processing was examined in high purity MgAl2O4 spinel. As the density ρt increases, that is, as the effective stress σeff decreases, stress exponent n evaluated from σeff dependence of densification rate varies from n ≥ 4 in the low ρt region, n ≈ 2 in the intermediate ρt region to n ≈ 1 in the high ρt region. TEM observation shows that significant stacking faults caused by partial dislocations are observed in the low ρt region, but limited in the high ρt region. The ρt dependent densification behavior and microstructure suggest that the predominant densification mechanism during the SPS processing changes with ρt from plastic flow by partial dislocation motion for the low ρt region (n ≥ 4) to diffusion-related creep for the high ρt region (n ≈ 1).

  Info
Periodical
Edited by
Pietro VINCENZINI, Ralf RIEDEL, Alexander G. MERZHANOV and Chang-Chun GE
Pages
62-67
DOI
10.4028/www.scientific.net/AST.63.62
Citation
K. Morita, B. N. Kim, H. Yoshida, K. Hiraga, Y. Sakka, "Densification Mechanism of MgAl2O4 Spinel during Spark-Plasma-Sintering", Advances in Science and Technology, Vol. 63, pp. 62-67, 2010
Online since
October 2010
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Adriana Scoton Antonio Chinelatto, Milena Kowalczuk Manosso, Elíria Maria Jesus Agnollon Pallone, Ana Maria Souza, Adilson Luiz Chinelatto
Abstract:Sintering in two-steps has been applied with success for densification of nanometric and submicrometer ceramic powders without grain growth....
221
Authors: Abdullah Khalil, Abbas Saeed Hakeem, Nouari Saheb
Chapter 2: Material Science and Technology
Abstract:In the present study, Al2124 and Al6061 alloys were consolidated through spark plasma sintering at 400, 450 and 500 °C using three different...
1517
Authors: Bao Rang Li, Xin Ming Xi, Yang Bai
Chapter 1: Material Engineering and Technology
Abstract:The nano-TiO2 powders with the average particle size of about 40nm were used as starting materials. The compacted powders were...
29
Authors: Jason Milligan, Mathieu Brochu
Chapter 12: Nanostructured Materials
Abstract:A strong push has been observed in the automotive industry to replace current components with high-performance and lightweight materials such...
514
Authors: Wei Jiu Huang, Gui Sen Wu, Fan Cheng Meng, Feng Ye
Abstract:The preparation of ultrafine-grained alumina ceramics by the fast sintering technique Self-propagating High-temperature Synthesis plus Quick...
103