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Thermo-mechanical stability of porous alumina: effect of sintering parameters

机译：多孔氧化铝的热机械稳定性：烧结参数的影响

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Recently, we proposed a two-step heating schedule involving pulse electric current sintering (PECS), a kind of pressure assisted vacuum sintering, and subsequent post-heat treatment in air to fabricate porous alumina support, using commercially available alumina and carbon powders [J. Mater. Res. 18 (2003) 751]. During pressure assisted vacuum sintering, Al_2O_3-C system of low porosity was obtained and in second stage, i.e. during post-heat treatment in air, carbon particles present in the Al_2O_3-C system burnt out to form highly porous Al_2O_3 support. Following our previous brief study, the effects of sintering parameters such as temperature, pressure, and heating rate on the properties of the porous alumina were investigated. The porosity varied between 28 and 38% depending on the sintering parameters. As desired, the pore size distribution did not change with post-heat treatment temperature and hence the mechanical properties as well. It was concurred from this present study that the sintering parameters of PECS greatly influenced pore characteristics and other properties of porous compacts. We admit that the initial composition ratio of powder mixture (Al_2O_3:C) also plays important role on properties such as porosity, pore size, etc. which is beyond the scope of this present study.
机译：最近，我们提出了两步加热计划，包括脉冲电流烧结（PECS），一种压力辅助真空烧结以及随后在空气中的后热处理，以使用市售氧化铝和碳粉制造多孔氧化铝载体[J]。 。母校Res。 18（2003）751]。在压力辅助真空烧结过程中，获得了低孔隙率的Al_2O_3-C系统，在第二阶段，即在空气中进行后热处理期间，存在于Al_2O_3-C系统中的碳颗粒被燃烧掉，形成了高度多孔的Al_2O_3载体。在我们之前的简短研究之后，研究了烧结参数（例如温度，压力和加热速率）对多孔氧化铝性能的影响。孔隙率在28％至38％之间变化，具体取决于烧结参数。如所希望的，孔径分布不随后热处理温度而变化，因此也不随机械性能而变化。从本研究中得出的结论是，PECS的烧结参数极大地影响了多孔压制品的孔隙特性和其他性能。我们承认，粉末混合物的初始组成比（Al_2O_3：C）也对诸如孔隙率，孔径等性质起着重要作用，这超出了本研究的范围。

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