Influence of green state processes on the sintering behaviour and the subsequent optical properties of spark plasma sintered alumina
Influence of green state processes on the sintering behaviour and the subsequent optical properties of spark plasma sintered alumina
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DOI：
10.1016/j.jeurceramsoc.2009.07.014
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发表时间：
2009-12
影响因子：
5.7
通讯作者：
Y. Aman;V. Garnier;E. Djurado
中科院分区：
文献类型：
--
作者：
Y. Aman;V. Garnier;E. Djurado
本研究给出了不同的绿色微观结构之间的定量相关性，以及它们在放电等离子烧结过程中的烧结行为。通过各种绿色成型工艺，如直接铸造和直接凝固铸造，与所接收的亚微米颗粒的超细粉末的单轴压实相比，详细阐述了绿色微观结构。缩小绿色压坯的孔径分布并减小其孔径（约40 nm）有利于在初始单轴压制过程中通过晶粒滑动和重排实现冷致密化。这归因于直接浇铸绿色样品中柔软均匀的接触网络。因此，晶粒生长受阻，收缩的开始被延迟。此外，均匀的绿色体中的小孔和窄的孔径分布导致更高的最终密度，与不太均匀的绿色样品相比具有更好的光学性质。
The present investigation gives a quantitative correlation between different green microstructures, and their sintering behaviour during spark plasma sintering. The green microstructures were elaborated via various green shaping processes such as direct casting and direct coagulation casting compared to uniaxial compaction of the as-received sub-micron grained corundum powder. Narrowing pore size distribution and reducing pore size (≈40nm) in the green compact could favour cold densification during initial uniaxial pressing by grain sliding and rearrangement. This is attributed to the soft homogeneous touching network in direct-cast green samples. Consequently, grain growth was impeded and the onset of shrinkage was delayed. Moreover, the small pores and the narrow pore size distribution in the homogeneous green bodies led to higher final densities, with better optical properties compared to the less homogeneous green samples.