MICROSTRUCTURAL EFFECTS ON THE MECHANICAL AND THERMAL PROPERTIES OF PULSED ELECTRIC CURRENT SINTERED Cu-Al2O3 COMPOSITES

The influences of the microstructure on the mechanical and thermal properties of pulsed electric current sintered (PECS) Cu-Al2O3 composites were investigated. The process parameters were optimised for four different grades of composite powders to obtain dense samples (98-99.6% TD). Higher hardness...

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Bibliographic Details
Main Authors: Ritasalo, R, Liua, X W, Soderberg, O, Keski-Honkola, A, Pitkanen, V, Hannula, S-P
Format: Conference Proceeding
Language:English
Subjects:
ALUMINUM OXIDE
Compacts
COMPOSITES
Copper
CURRENT
Electric current
HARDNESS
Microstructure
MICROSTRUCTURES
PARAMETERS
Process parameters
PROPERTIES
SINTERING
THERMAL PROPERTIES
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Summary:The influences of the microstructure on the mechanical and thermal properties of pulsed electric current sintered (PECS) Cu-Al2O3 composites were investigated. The process parameters were optimised for four different grades of composite powders to obtain dense samples (98-99.6% TD). Higher hardness and better thermal stability were attained to the samples compacted from commercial internally oxidised powders than to the compacts made from the chemically synthesised experimental powders. This difference was attributed to the distribution and size of Al2O3-particles in the two types of composites. The CTE values of all the compacts were between 17 and 20 x 10 exp(-6)/K (370-770 K). The results show that PECS can be used to produce dense high quality Cu-Al2O3 composites.
ISSN:1877-7058
1877-7058
DOI:10.1016/j.proeng.2011.04.023