Synthesis and Properties of Pulsed Electric Current Sintered AlN/Cu Composites
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MRS Advances © 2018 Materials Research Society DOI: 10.1557/adv.2018.671
Synthesis and Properties of Pulsed Electric Current Sintered AlN/Cu Composites Carlos A. León-Patiño1, Deisy Ramirez-Vinasco1, Ena A. Aguilar-Reyes1 and Makoto Nanko2 1 Instituto de Investigación en Metalurgia y Materiales, Universidad Michoacana de San Nicolás de Hidalgo. Edificio U, Ciudad Universitaria, C.P. 58130, Morelia, Mexico.
2 Department of Mechanical Engineering, Nagaoka University of Technology, Nagaoka, Niigata 9402188, Japan.
ABSTRACT
This research shows the development of alternative Cu-based materials for applications where enhanced thermal properties are desired. Cu/AlN composites were fabricated from mixtures of pure Cu and copper plated AlN-Cu composite powders. The ceramic phase was added in amounts of 10, 20 and 30 vol.% and the mixtures sintered by pulsed electric current sintering process (PECS). The results showed that the AlN particles are homogeneously distributed in the copper matrix and that the true contacts between hard particles are reduced because of the deposited copper on their surfaces, improving the connectivity of the matrix phase and bonding at the metal-ceramic interface. The relative density of the Cu/AlN composites was major than 97% in all cases. Thermal conductivity of the composites was high and decreased with the ceramic content from 359 to 194 W/mK, for 10 and 30% AlN, respectively. The coefficient of thermal expansion followed a lineal behavior with temperature and is also reduced with the ceramic content.
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INTRODUCTION Because of its promissory properties, the combination of copper with aluminum nitride in the fabrication of Cu/AlN composites results attractive for functional applications. Copper is a high thermal and electrically conductive material, while AlN is a light material that shows a moderated thermal expansion and the highest thermal conductivity between ceramic materials; thus, AlN constitutes an alternative filling material for tailoring the thermophysical properties of copper base composites [1,2]. An important route for processing discontinuously reinforced metal-matrix composites (MMC ́s) that allows introduce different volumes of filling for thermal management applications is powder technology [3,4]. Pulsed electric current sintering (PECS), also known as spark plasma sintering (SPS), constitutes a novel technique for the super-fast densification of metals, ceramics and composites. Some of the advantages of PECS sintering are higher heating rates, improved microstructure (smaller grain size) and fully densified materials at lower temperatures and shorter times than that reached by conventional hot-pressing techniques [5-7]. However, in the sintering of metal-ceramic mixtures, interfacial defects, lack of adhesion and segreg
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