comparison of creep behavior in alumina based ceramics densified by spark plasma sintering and hot pressing

Authors

e. karamian

s. abdollah

a. bataille

abstract

spark plasma sintering (sps) method, as plasma activated sintering, is a method applicable for rapid sintering of metals and ceramics. owing to the advantage of rapid heating, the alumina ceramics obtained by sps have a grain size and density comparable to those of hot pressed ones. the increase of densification rate may be related to some difference in ion transport characteristics. this study describes creep behavior and deformation mechanisms of alumina based materials densified by sps, and somewhat comparison is made with hot pressing (hp) at high temperature. pure alumina was densified by sps at 65 mpa (1200 ºc) and 45 mpa (1400 ºc) by hp. the grain size of the alumina hped was twice more than the grain size of the sample spsed. compressive creep tests in air were performed at different true stresses up to100 mpa and different temperatures (1200 ºc-1400 ºc). the grain growth was found to be more active during creep of sps alumina than the creep of hp alumina. generally, the fineness of sps materials microstructure speeded up all processes related to diffusion. the ratio of dynamic to static grain growth in spsed samples was twice more than hped samples during creep test

Upgrade to premium to download articles

Sign up to access the full text

Already have an account?login

similar resources

Comparison of Creep Behavior in Alumina Based Ceramics Densified by Spark Plasma Sintering and Hot Pressing

Spark plasma sintering (SPS) method, as plasma activated sintering, is a method applicable for rapid sintering of metals and ceramics. Owing to the advantage of rapid heating, the alumina ceramics obtained by SPS have a grain size and density comparable to those of hot pressed ones. The increase of densification rate may be related to some difference in ion transport characteristics. This study...

full text

Zirconium Carbide Produced by Spark Plasma Sintering and Hot Pressing: Densification Kinetics, Grain Growth, and Thermal Properties

Spark plasma sintering (SPS) has been employed to consolidate a micron-sized zirconium carbide (ZrC) powder. ZrC pellets with a variety of relative densities are obtained under different processing parameters. The densification kinetics of ZrC powders subjected to conventional hot pressing and SPS are comparatively studied by applying similar heating and loading profiles. Due to the lack of ele...

full text

Hot Deformation Behavior and Pulse Current Auxiliary Isothermal Forging of Hot Pressing Sintering TiAl Based Alloys

This paper focuses on the fabrication of as-forged Ti46.5Al2Cr1.8Nb-(W, B) alloy via pulse current auxiliary isothermal forging (PCIF). The starting material composed of near gamma (NG) microstructure was fabricated by adopting pre-alloyed powders via hot pressing sintering (HPS) at 1300 °C. Isothermal compression tests were conducted at a strain rate range of 0.001-0.1 s-1 and a temperature ra...

full text

Structural and Electrical Properties of BNT-BT0.08 Ceramics Processed by Spark Plasma Sintering

(Bi0.5Na0.5)TiO3 doped with 8 mol % BaTiO3 powder (BNT-BT0.08), prepared by sol-gel method was compacted and sintered by Spark Plasma Sintering (SPS) process. The influence of SPS temperature on the densification of BNT-BT0.08 ceramic was investigated. Starting from sol-gel nanopowder of BNT-BT containing 8 mol % BaTiO3 with an average particles size of about 30 nm, were obtained ceramics with ...

full text

My Resources

Save resource for easier access later


Journal title:
international journal of iron & steel society of iran

Publisher: iron & steel society of iran

ISSN 1735-4145

volume 9

issue 1 2012

Hosted on Doprax cloud platform doprax.com

copyright © 2015-2023