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Park, H.; Park, S. Y.

doi:10.1023/a:1010957014567

Cited by 5 publications

(1 citation statement)

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“…Abnormal grain growth (AGG) during sintering of alumina is has been investigated focusing on the influence of a liquid phase, impurity, and size distribution, pore grain boundary separation [1][2][3][4]. In many studies on abnormal grain growth, only the growth stage has been concerned compared to the nucleation stage, because of fast appearance and rapid growth of nuclei during abnormal grain growth.…”

Section: Introductionmentioning

confidence: 99%

Abnormal Grain Growth Mechanism in Alumina

Bang

Song

Park

2006

MSF

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During the sintering process, the onset of abnormal grain growth is depend on various factors. The abnormal grain growth behavior, however, was focused only the growth stage compared to nucleation stage. Because most of abnormal grain growth occurred to a rapid mode, the observation of abnormal grain growth was impossible. In this study, we intend to in-situ observe the nucleation stage of abnormal grain using porous alumina. As a result, the liquid phase due to unintended impurities plays a main role for the formation of abnormal nuclei by the rearrangement of small grains due to the capillary force.

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Section: Introductionmentioning

confidence: 99%

Abnormal Grain Growth Mechanism in Alumina

Bang

Song

Park

2006

MSF

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Structure characterization of spark plasma sintered alumina by positron annihilation lifetime spectroscopy

Djourelov

Aman

Berovski

et al. 2011

Physica Status Solidi (a)

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Positron annihilation lifetime spectroscopy (PALS) measurements were performed to study the influence of the sintering temperature, heating rate and dwell time on the porosity and on the defect concentration on series of spark plasma sintered alumina samples. Two long‐lived components were found in the PALS spectra and were associated to pick‐off annihilation of ortho‐positronium localized in two types of pores. The same spectra were analysed in the frame of the three‐state‐trapping model and information for the intragranular and at grain boundary defect concentration was extracted. At sintering temperatures below 1200 °C the regime of the high (600 °C/min) heating rate leaded to more efficient defect annealing compared to the regime of the low (8 °C/min) heating rate, while at higher temperatures this difference disappeared. The low heating rate at high temperatures leaded to more compact samples compared to these sintered at the high heating rate as a result of intergranular pore concentration decrease.

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