The effect of particle-size distribution on microstructural several reports 9,10,14 showed that the pore radius decreased throughout the intermediate stage of sintering. Asaga et al. 9 evolution in the intermediate stage of sintering of powder compacts was investigated. The evolution of pore channels also reported that aggregation had a significant influence on the radius of the pore channel in sintering. The radius of the pore was dominated by particle-size distribution but independent of sintering temperature. Moreover, a powder compact channel was the main subject that most authors investigated. In this investigation, it was found that the total length of pore with a fine particle and uniform size distribution could prolong the intermediate stage of sintering, which in turn channels per unit volume (L V ) was related more closely to the grain growth than to pore radius in the intermediate stage effectively inhibited grain growth. The mechanisms of evolution and pinch off of the pore channels of the powder of sintering. The object of this paper is to study the effect of the particlecompact with different particle-size distributions were discussed.size distribution on the microstructural evolution in the intermediate stage of sintering. I. IntroductionII. Experimental Procedure T HE sintering process is usually divided in three stages. The relationship of density and grain size has been studied A high-purity ␣-Al 2 O 3 powder (Ͼ99.995%, AKP-50, Sumitomo Chemical Co., Ltd., Tokyo, Japan) was used throughout intensively in the final stage. Microstructural evolution during this investigation (impurities were silicon, Ͻ25 ppm; magnesintering usually is characterized by interactions between grain sium, Ͻ10 ppm; copper, Ͻ10 ppm; and iron, Ͻ20 ppm). The boundaries and isolated two-sided pores. 1 However, it has been as-received powders had a mass median diameter of 0.24 m. reported 2 that the interactions between grain boundaries andThe classified powder had a mass median diameter of 0.21 m pores located at different sites are quite different. Thus, in and was produced from as-received powders using the centrifuevaluating microstructural evolution, pores located at different gal process. The centrifugal process for preparing classified sites should be accounted for during sintering. Therefore, it is powders started with a slurry of 20 vol% solids dispersed in important to understand the evolution of pore morphology in deionized water and stabilized at pH 4 with nitric acid. The the earlier stages of sintering, which determines the location dispersed slurry was centifuged at 800 rpm for 30 min. Thereof the isolated pores. In the initial stage of sintering, pore after, the upper suspension solution of the slurry was used for morphology does not change significantly, and Greskovich and further centrifugation at speeds up to 2400 rpm. The classified Lay 3 report that grain boundaries move only after necks have powder was the final sediment in the slurry. The as-received completely formed between the sintering particles. Th...
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