Powder Technology, Vol.291, 193-200, 2016
Mechanical dispersion of platinum particles and its effect on the microstructure of MCrAlY alloy prepared by SPS
Spark plasma sintering (SPS) technique was used to densify fine Pt-particles with a MCrA1Y alloy powder, at temperatures ranging between 1000 and 1050 degrees C in order to obtain consolidated tablets. Fine dispersion of Pt-particles into a full densified matrix was achieved on the products while the overall SPS processing time did not exceed 30 min. Both chemical constitution and microstructure, as well as porosity evaluation were investigated by using scanning electron microscopy, chemical analysis and X-ray diffraction. The fine Pt-particles embedded into the MCrAlY matrix have no marked influence over the final microstructure but in its sintering consolidation behavior. The effect of Pt-particles, as-deposited on the surface of MCrAlY/Pt might mean important technical advantages on the obtained products due to the refined microstructure and the solubility level attained, which can lead to attractive applications for high temperature corrosion systems. (C) 2015 Elsevier B.V. All rights reserved.