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Texture In Na-β-al_2o_3 Due To Microwave Processing

机译：Na-β-al_2o_3的微波织构

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摘要

Na-β-Al_2O_3 powder after compaction and subsequent microwave irradiation yielded dense sintered prod-ucts indicating preferred orientation along either the basal plane (002) or prismatic plane (220). The orientation depends on whether the starting material is a commercial powder or a precursor synthesized through wet-chemical route. The product from the latter powder exhibits uniform microstructure as well as a grain size smaller than 5 μm while that from the former shows abnormal grain growth with sizes varying from 1.5 μm up to 25 μm. Vickers hardness measurements yield an average hardness of 7.4 GPa at 0.1 kg load for the samples derived from the wet-chemically derived precursor and 13 GPa at 0.1 kg load for the sintered samples from the commercial powder. The first value is characteristic of crystallites oriented along the (220) plane while the second value speaks for crystallites oriented along the (002) plane.
机译：压实和随后的微波辐射后，Na-β-Al_2O_3粉末产生致密的烧结产品，表明其沿基面（002）或棱柱面（220）的优选取向。取向取决于原料是商业粉末还是通过湿化学途径合成的前体。后一种粉末的产品显示出均匀的微观结构，并且晶粒尺寸小于5μm，而前一种粉末的产品显示出异常晶粒生长，尺寸范围从1.5μm到25μm不等。维氏硬度测量得出的湿化学衍生前体样品在0.1 kg载荷下的平均硬度为7.4 GPa，对于商品粉末的烧结样品在0.1 kg载荷下的平均硬度为13 GPa。第一个值代表沿（220）平面取向的微晶的特性，而第二个值代表沿（002）平面取向的微晶。

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