Mechanically alloyed and spark plasma sintered aluminium/precious metal oxide composite materials

Kubota, Masahiro and Cizek, Pavel 2010, Mechanically alloyed and spark plasma sintered aluminium/precious metal oxide composite materials, Materials science forum, vol. 638-642, pp. 1824-1829.

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Title Mechanically alloyed and spark plasma sintered aluminium/precious metal oxide composite materials
Author(s) Kubota, Masahiro
Cizek, Pavel
Journal name Materials science forum
Volume number 638-642
Start page 1824
End page 1829
Total pages 7
Publisher Trans Tech Publications
Place of publication Stafa-Zurich, Switzerland
Publication date 2010
ISSN 0255-5476
Keyword(s) aluminium
mechanical alloying
spark plasma sintering
solid state reaction
precious metal oxide
AgO
PtO2
PdO
mechano-chemical reaction
Summary Air-atomised pure aluminium powder with additions of 10 at.% of AgO, PtO2 or PdO was mechanically alloyed (MAed) by using a vibrational ball mill, and MAed powders were consolidated into bulk materials by a spark plasma sintering (SPS) process. Mechano-chemical reactions among pure Al, precious metal oxide and stearic acid, added as a process control agent, during the mechanical alloying (MA) process and subsequent heat treatments were investigated by X-ray diffraction. The mechanical properties of MAed powders obtained under various heat treatment conditions and those of the SPS materials were evaluated by hardness tests. Mechano-chemical reactions occurred in Al/precious metal oxide composite powders during 36 ks of the MA process to form AlAg2, Pt and Al3Pd2 for the Al-AgO, Al-PtO2 and Al-PdO systems, respectively. Further solid-state reactions in MAed powders have been observed after heating at 373 K to 873 K for 7.2 ks. The hardness of MAed powders initially increased significantly after heating at 373 K and then generally decreased with increasing heating temperatures. The full density was obtained for the SPS materials under the conditions of an applied pressure of 49 MPa at 873 K for 3.6 ks. All the SPS materials exhibited hardness values of over 200 HV in the as-fabricated state.
Language eng
Field of Research 091202 Composite and Hybrid Materials
Socio Economic Objective 861299 Fabricated Metal Products not elsewhere classified
HERDC Research category C1 Refereed article in a scholarly journal
HERDC collection year 2010
Copyright notice ©2010, Trans Tech Publications
Persistent URL http://hdl.handle.net/10536/DRO/DU:30035318

Document type: Journal Article
Collection: Centre for Material and Fibre Innovation
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