skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Oxidation effects on spark plasma sintering of molybdenum nanopowders

Journal Article · · Journal of the American Ceramic Society
DOI:https://doi.org/10.1111/jace.16182· OSTI ID:1611091
ORCiD logo [1]; ORCiD logo [2];  [3];  [4];  [4];  [1]
  1. San Diego State Univ., CA (United States); Univ. of California, San Diego, CA (United States)
  2. San Diego State Univ., CA (United States)
  3. Univ. of California, San Diego, CA (United States)
  4. General Atomics, San Diego, CA (United States)

Abstract 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.

Research Organization:
San Diego State Univ., CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; USDOE
Grant/Contract Number:
SC0008581; DE‐SC0008581
OSTI ID:
1611091
Alternate ID(s):
OSTI ID: 1481439
Journal Information:
Journal of the American Ceramic Society, Vol. 102, Issue 2; ISSN 0002-7820
Publisher:
American Ceramic SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 7 works
Citation information provided by
Web of Science

References (46)

Densification mechanism and mechanical properties of tungsten powder consolidated by spark plasma sintering journal December 2016
Densification behavior of Mo nanopowders prepared by mechanochemical processing journal February 2009
Thermodynamic modeling and investigation of the oxygen effect on the sintering of B 4 C journal March 2017
Grain Growth in CeO2: Dopant Effects, Defect Mechanism, and Solute Drag journal July 1996
Densification behaviour of pure molybdenum powder by spark plasma sintering journal July 2010
Grain Boundary Mobility in Y2O3: Defect Mechanism and Dopant Effects journal July 1996
Surface effects in field-assisted sintering journal January 2001
Effect of Starting Particle Size and Oxygen Content on Densification of ZrB2: Effect of Particle Size and Oxygen Content on Densification of ZrB2 journal September 2010
Analytical treatment of the role of surface oxide layers in the sintering of metals journal November 1979
Modification of the sintering kinetics of palladium by a surface oxide journal September 1981
The role of dispersed particles in strengthening and fracture mechanisms in a Mo-ZrC alloy processed by mechanical alloying journal March 2000
The absence of plasma in “spark plasma sintering” journal August 2008
Evidence of surface cleaning during electric field assisted sintering journal December 2013
Spark plasma sintering of tantalum carbide journal September 2010
Sintering activation by external electrical field journal August 2000
The origin of specimen contamination in the electron microscope journal April 1953
Time-dependent dielectric breakdown of surface oxides during electric-field-assisted sintering journal January 2014
Current understanding and future research directions at the onset of the next century of sintering science and technology journal May 2017
Surface Oxides and Sintering of Metals journal January 1981
Densification and grain growth during isothermal sintering of Mo and mechanically alloyed Mo–TZM journal August 2009
Division of the hardness of molybdenum into rate-dependent and rate-independent components journal October 1994
Effect of carbon content on the microstructure and properties of silicon carbide-based sinters journal February 2001
Effects of mechanical activation of MoO3/C powder mixture in the processing of nano-crystalline molybdenum journal July 2011
Influence of Oxygen Concentration on Mechanical Properties of Molybdenum Powder During Sintering journal December 2014
SOLID STATE REDUCTION OF MoO 3 WITH CARBON VIA MECHANICAL ALLOYING TO SYNTHESIZE NANO-CRYSTALINE MoO 2 journal January 2012
Elimination of oxide films during Spark Plasma Sintering of metallic powders: A case study using partially oxidized nickel journal February 2017
A spark plasma sintering densification modeling approach: from polymer, metals to ceramics journal February 2018
The Mo-O system (Molybdenum-Oxygen) journal September 1980
Densification mechanisms of spark plasma sintering: multi-step pressure dilatometry journal May 2012
Mechanical properties of a ZrC-dispersed Mo alloy processed by mechanical alloying and spark plasma sintering journal January 2000
Activation analysis of deformation in evaporated molybdenum thin films journal March 2003
Modeling of Gas-Phase Transport and Composition Evolution during the Initial-Stage Sintering of Boron Carbide with Carbon Additions: Modeling of Gas-Phase Transport and Composition Evolution in B4C journal November 2010
Theory of sintering: from discrete to continuum journal June 1998
In situ transmission electron microscopy study of dielectric breakdown of surface oxides during electric field-assisted sintering of nickel nanoparticles journal August 2012
Grain boundary conductivity of high purity neodymium-doped ceria nanosystem with and without the doping of molybdenum oxide journal November 2007
Role of Carbon in the Sintering of Boron-Doped Silicon Carbide journal May 2000
Effect of electric current on densification behavior of conductive ceramic powders consolidated by spark plasma sintering journal February 2018
Pyrophoric behaviour of ultrafine Mo powder journal November 2017
Phase Relations in Refractory Metal-Oxygen Systems journal October 1969
Improved understanding of the spark plasma sintering process journal May 2015
Mechanical Properties of Fine-Grained, Sintered Molybdenum Alloys with Dispersed Particles Developed by Mechanical Alloying journal January 2004
Spark-plasma-sintering and finite element method: From the identification of the sintering parameters of a submicronic α-alumina powder to the development of complex shapes journal January 2016
A Neutron Diffraction Investigation on a Crystal of alpha-Mo2C. journal January 1977
A discussion on the absence of plasma in spark plasma sintering journal May 2009
Review: liquid phase sintering journal January 2009
Effect of Boron and Carbon on Sintering of SIC journal January 1975

Cited By (1)

On the Structural and Chemical Homogeneity of Spark Plasma Sintered Tungsten journal August 2019