Mechanical dispersion of platinum particles and its effect on the microstructure of MCrAlY alloy prepared by SPS

• Pt coating on MCrAlY surface was prepared by dry mechanical blending process.
• The shrinkage effect during sintering of MCrAlY/Pt powder was assessed.
• The sintered MCrAlY/Pt powder had a higher density value.

Spark plasma sintering (SPS) technique was used to densify fine Pt-particles with a MCrAlY alloy powder, at temperatures ranging between 1000 and 1050 °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.

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