Oxidation effects on spark plasma sintering of molybdenum nanopowders

Lee, Geuntak; Manière, Charles; McKittrick, Joanna; Gattuso, Anthony; Back, Christina; Olevsky, Eugene A.

doi:10.1111/jace.16182

Oxidation effects on spark plasma sintering of molybdenum nanopowders

Journal Article · Tue Oct 09 04:00:00 EDT 2018 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/jace.16182· OSTI ID:1611091

^[1]; ^[2]; McKittrick, Joanna ^[3]; Gattuso, Anthony ^[4]; Back, Christina ^[4]; Olevsky, Eugene A. ^[5]

San Diego State Univ., CA (United States); Univ. of California, San Diego, CA (United States); DOE/OSTI
San Diego State Univ., CA (United States)
Univ. of California, San Diego, CA (United States)
General Atomics, San Diego, CA (United States)
San Diego State Univ., CA (United States); Univ. of California, San Diego, CA (United States)

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. Finally, the advantages and disadvantages of these methods in terms of the density, grain size, and mechanical properties of the final products are discussed.

View Accepted Manuscript (DOE)

Research Organization:: San Diego State Univ., CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: SC0008581

OSTI ID:: 1611091

Alternate ID(s):: OSTI ID: 1481439

Journal Information:: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 2 Vol. 102; ISSN 0002-7820

Publisher:: American Ceramic SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Oxidation effects on spark plasma sintering of molybdenum nanopowders

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