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Oxidation effects on spark plasma sintering of molybdenum nanopowders
Author(s) -
Lee Geuntak,
Manière Charles,
McKittrick Joanna,
Gattuso Anthony,
Back Christina,
Olevsky Eugene A.
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16182
Subject(s) - spark plasma sintering , materials science , sintering , pellets , molybdenum , oxide , porosity , metallurgy , pellet , powder metallurgy , particle (ecology) , phase (matter) , particle size , impurity , grain size , composite material , chemical engineering , oceanography , chemistry , organic chemistry , engineering , geology
Surface‐oxidized molybdenum nanopowders are compacted by spark plasma sintering ( SPS ). The oxide impurity behavior is analyzed under various sintering temperatures. The densification mechanism of the nanopowders with a melted oxide phase is identified in situ by regression analysis of the experimental data on the temperature‐dependent porosity change and on the SPS multistep pressure dilatometry. To increase the density of the compacted pellets, the nanopowders with the oxide phase are consolidated by SPS using the two in situ oxide removal methods: carbothermic reduction and particle surface cleaning by the electric current flow through the powders. The advantages and disadvantages of these methods in terms of the density, grain size, and mechanical properties of the final products are discussed.