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Study of decomposition behaviour of binders and the effect of binder type on strength and density of alumina samplesud

机译：粘结剂分解行为及粘结剂类型对氧化铝样品强度和密度的影响 ud

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摘要

Organic binders are generally used during green shaping of ceramic bodies as these binders help in obtaining desired green density and defect minimization during pressing. The aim of the present study was two-fold. First was to study the decomposition behaviour of the three chosen binders (viz. PVA, Dextrin and Starch) through DSC/TG, FTIR and weight loss measurements in air. Second was incorporating these binders (in different amount) in reactive alumina (which was chosen as the base ceramic matrix) in different proportions. Subsequently these binder added powders were sintered in air at 1550ºC and sintered pellets were characterized for apparent porosity, bulk density, strength and surface feature (through optical microscope).The strength and density measurements for both green and sintered samples were carried out and they showed varied trends. The green strength of starch added pellets was found to be least while PVA containing pellets had maximum green strength. In case of sintered pellets, starch added samples showed the most consistent set of strength values but its strength decreased with increase in binder concentration while the reverse occurred for PVA and dextrin containing pellets. Removal of binders is an important step during high temperature sintering process and under ideal conditions binder removal should be complete before consolidation of ceramic particles has started. When binder removal from sintered samples is incomplete, the sintered samples may contain defects such as black coring (due to incomplete burning of carbon which will be present as residual carbon below the surface), sealed pores, bloating, etc. Optical microscope imaging was done to observe the presence of such defects. These defects may lead to a variation in pore shape, size and distribution.
机译：通常在陶瓷坯体的生坯成形过程中使用有机粘合剂，因为这些粘合剂有助于获得所需的生坯密度并在压制过程中使缺陷最小化。本研究的目的是双重的。首先是通过DSC / TG，FTIR和空气中的失重测量来研究三种选择的粘合剂（即PVA，糊精和淀粉）的分解行为。其次是将这些粘合剂（以不同的量）以不同的比例掺入活性氧化铝（被选作基础陶瓷基体）中。随后将这些添加了粘结剂的粉末在1550°C的空气中烧结，并通过光学显微镜对烧结后的球团进行表征，以观察其孔隙率，堆积密度，强度和表面特征。对生坯和烧结后的样品进行了强度和密度测量，结果表明变化趋势。发现添加淀粉的粒料的生坯强度最小，而含PVA的粒料的生坯强度最大。对于烧结的颗粒，添加淀粉的样品显示出最一致的强度值，但是其强度随粘合剂浓度的增加而降低，而含PVA和糊精的颗粒则相反。粘结剂的去除是高温烧结过程中的重要步骤，在理想条件下，粘结剂的去除应在陶瓷颗粒开始固结之前完成。当从烧结样品中去除粘合剂的过程不完全时，烧结样品中可能会存在以下缺陷：黑核（由于碳的不完全燃烧，将作为表面以下的残留碳存在），密封的孔，膨胀等。进行了光学显微镜成像观察是否存在此类缺陷。这些缺陷可能导致孔隙形状，大小和分布变化。

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    Das Shibani;

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  • 年度 2011
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