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19-04-2019 | Issue 8/2019

Journal of Materials Science: Materials in Electronics 8/2019

Effect of powder characteristics on the thermal conductivity and mechanical properties of Si3N4 ceramics sintered by Spark plasma sintering

Journal:
Journal of Materials Science: Materials in Electronics > Issue 8/2019
Authors:
Hanghang Dong, Zhe Zhao, Cao Wang
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Abstract

The effect of powder characteristics on the thermal conductivity and mechanical properties of silicon nitride (Si3N4) ceramics were investigated systematically by using two α-Si3N4 powders as raw materials and using MgSiN2 or MgO + Y2O3 as sintering additives. The Si3N4 ceramics with a higher density were obtained by α-Si3N4 powders with lower oxygen content and impurities and using none-oxide sintering additive MgSiN2. The α–β phase transformation completely taken place in all the specimen at 1750 °C. The specimens sintered by powders with lower levels of oxygen and impurities show higher mechanical properties than other specimens. The Y2O3 and MgO sintering additives lead to higher flexural strength and fracture toughness than MgSiN2. The Vickers’ hardness is just the opposite. The thermal conductivity value of powders with lower oxygen content is higher than that of the materials prepared by the other type of powder at the same conditions. The effects of the Si3N4 particle size, native oxygen and impurities on the thermal conductivity of resultant materials were discussed in detail. This work demonstrates that the improvement in thermal conductivity of Si3N4 can be obtained by using none-oxide sintering additive MgSiN2 and the Si3N4 powder with lower oxygen content, and impurities.

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