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The densification of Y_2O_3 was carried out by spark plasma sintering (SPS) technique with various heating rates (5, 10, 20, and 50°C/min) and holding times (2, 5, 20, and 60 mins) at 1000°C. Among th...e entire specimens, uniform or non-uniform sintering behavior was divided based on the heating rate of 20°C/min like Fig. 1. At the heating rate of 20°C/min, the center was totally translucent and densified, and the boundary of the specimen was opaque. On increasing the holding time, the center became opaque and the periphery became translucent. It is special result that the sintering is conducted thoroughly and the regions were divided. As a result of the microstructural analysis, the grain size in the center of all specimens was larger than the periphery. Especially, at the high heating rate (20 and 50°C/min), the difference in grain size between the center and periphery was significantly increased around 3.5 times on average. In addition, there was a difference of the pore size and distribution. Above non-uniform sintering behavior could be explained by setting the assumption (the mass transfer occurred from center to periphery). The densification was carried out with lots of defects in sintered bodies and coarsening was significantly induced in the center due to the assumption and the dynamic grain growth on increasing the heating rate [1]. The evidence to demonstrate the assumption will be obtained by additional experiments.続きを見る
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