The Property Characterization of α-Sialon/Ni Composites Synthesized by Spark Plasma Sintering

Adeniyi, Adedayo Sherif and Amir Azam, Khan and Bilal, Anjum Ahmed and Abbas, Saeed Hakeem and Faheemuddin, Patel and Akolad, Idris Bakare and Anwar, Ul-Hamid and Muhammad Ali, Ehsan and Tahir, Irfan Khan (2019) The Property Characterization of α-Sialon/Ni Composites Synthesized by Spark Plasma Sintering. Nanomaterials, 9 (12). pp. 1-12. ISSN 2079-4991

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Abstract

This study investigates the effect of micron-sized nickel particle additions on the microstructural, thermal, and mechanical property changes of α-sialon ceramic composites. The α-sialon/Ni composites were synthesized with an increasing amount of Ni (10–40 wt.%) using the spark plasma sintering technique and nanosized alpha precursors at a relatively low synthesis temperature of 1500 ◦C with a holding time of 30 min in each case. The density of the samples increased with the increase in Ni content of up to 15 wt.% and, with the further increase in Ni content, it became almost constant with a slight decrease. Furthermore, thermal conductivity and thermal expansion properties of Ni-sialon composites improved slightly with the inclusion of 10 wt.% Ni. The addition of Ni to α-sialon matrix resulted in a decrease in the hardness of the composites from HV10 21.6 to HV10 16.3, however the presence of Ni as a softer interfacial phase resulted in a substantial increase in the fracture toughness of these composites. Fracture toughness was found to increase by approximately 91% at 40 wt.% Ni addition.

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