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Phenomenological analysis of densification mechanism during spark plasma sintering of MgAl_2O_4

机译:MgAl_2O_4放电等离子体烧结致密化机理的现象学分析

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摘要

Spark plasma sintering (SPS) of MgAl_2O_4 powder was investigated at temperatures between 1200 and 1300℃. A significant grain growth was observed during densification. The densification rate always exhibits at least one strong minimum, and resumes after an incubation period. Transmission electron microscopy investigations performed on sintered samples never revealed extensive dislocation activity in the elemental grains. The densification mechanism involved during SPS was determined by anisothermal (investigation of the heating stage of a SPS run) and isothermal methods (investigation at given soak temperatures). Grain-boundary sliding, accommodated by an in-series {interface-reaction/lattice diffusion of the O_2~- anions} mechanism controlled by the interface-reaction step, governs densification. The zero-densification-rate period, detected for all soak temperatures, arise from the difficulty of annealing vacancies, necessary for the densification to proceed. The detection of atomic ledges at grain boundaries and the modification of the stoichiometry of spinel during SPS could be related to the difficulty to anneal vacancies at temperature soaks.
机译:研究了MgAl_2O_4粉末在1200〜1300℃之间的火花等离子体烧结(SPS)。在致密化过程中观察到明显的晶粒生长。致密化率始终表现出至少一个很强的最小值,并在潜伏期后恢复。对烧结样品进行的透射电子显微镜研究从未发现元素晶粒中广泛的位错活性。 SPS中涉及的致密化机理是通过等温(SPS运行的加热阶段的研究)和等温方法(在给定的保温温度下进行的研究)确定的。由界面反应步骤控制的串联{O_2〜-阴离子的界面反应/晶格扩散}机制调节的晶界滑动控制了致密化。在所有均热温度下检测到的零致密化速率周期是由于难以进行致密化所需的退火空位引起的。 SPS期间晶界原子壁架的检测和尖晶石化学计量的变化可能与温度均热时退火空位的困难有关。

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  • 来源
    《Journal of Materials Research》 |2009年第6期|2011-2020|共10页
  • 作者单位

    Laboratoire de Synthese et Fonctionnalisation des Ceramiques, UMR CNRS/Saint-Gobain 3080, Saint-Gobain C.R.E.E., 84306 Cavaillon Cedex, France;

    Laboratoire de Synthese et Fonctionnalisation des Ceramiques, UMR CNRS/Saint-Gobain 3080, Saint-Gobain C.R.E.E., 84306 Cavaillon Cedex, France;

    Laboratoire de Structure et Proprie'te's de I'Etat Solide, UMR CNRS 8008, Universitedes Sciences et Technologies de Lille, 59655 Villeneuve d'Ascq Cedex, France;

    Arrhenius Laboratory, University of Stockholm, 10691 Stockholm, Sweden;

    Laboratoire de Synthese et Fonctionnalisation des Ce'ramiques, UMR CNRS/Saint-Gobain 3080, Saint-Gobain C.R.E.E., 84306 Cavaillon Cedex, France;

    Laboratoire de Synthese et Fonctionnalisation des Ce'ramiques, UMR CNRS/Saint-Gobain 3080, Saint-Gobain C.R.E.E., 84306 Cavaillon Cedex, France;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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