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Dependence of mechanical properties on sintered microstructure of high purity alumina made by high-speed centrifugal compaction process

机译:力学性能对高速离心压实高纯氧化铝烧结组织的影响

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摘要

Influence of microstructures on mechanical properties of high performance alumina is investigated focusing on density and mean grain size as microstructure characteristics. An alumina powder with a purity of 99.99 % and mean grain size of 0.22μm is dispersed in 25 mass % of ion-exchanged water, compacted applying a centrifugal force of 10,000-20,000 g for 3 ks, and sintered at 1423-1773 K for 0-172.8 ks in air. It is shown that strength and hardness have one peak value respectively as microstructure develops during sintering, and those peaks appear on the same specimen with a relative density of about 99 % and grain size of about 1μm. For the specimens with density lower than 99 %, the strength and hardness decrease as density decrease, whereas for the ones with density higher than 99 %, those values decrease as grain size increase. Furthermore, two empirical equations, which show the dependence of bending strength and hardness on both porosity and grain size, are derived by multivariate analysis. These equations provide contour lines which represent microstructures having the same strength or hardness on the grain-size/relative-density diagram. Superposing a trajectory line derived from grain size and density of various specimens on the diagram, the point where this trajectory and one of contour lines contact represents the best couple of grain size and relative density for the mechanical properties.
机译:研究了微观结构对高性能氧化铝力学性能的影响,重点是密度和平均晶粒度作为微观结构特征。将纯度为99.99%,平均粒度为0.22μm的氧化铝粉末分散在25质量%的离子交换水中,并在10,000-20,000 g的离心力下压实3 ks,并在1423-1773 K下烧结。空中0-172.8 ks。结果表明,强度和硬度在烧结过程中随着显微组织的发展分别出现一个峰值,这些峰值出现在同一试样上,相对密度约为99%,晶粒尺寸约为1μm。对于密度低于99%的试样,强度和硬度随密度的降低而降低,而对于密度高于99%的试样,其值随晶粒尺寸的增加而降低。此外,通过多元分析得出了两个经验公式,这些公式显示了弯曲强度和硬度对孔隙率和晶粒尺寸的依赖性。这些方程式提供了等高线,这些等高线表示在晶粒尺寸/相对密度图上具有相同强度或硬度的微结构。将由各种样品的晶粒尺寸和密度得出的轨迹线叠加在图中,该轨迹与轮廓线之一接触的点代表了机械性能的最佳晶粒尺寸和相对密度对。

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