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观察氧化铝(Al2O3)过渡相χ-Al2O3及χ-Al2O3+κ-Al2O3混合相微粒粉末相变特征,目的在了解同一过渡相晶径组成的粉末粒体大小对最终所得α相生成及数量的关系.样品以热处理方式由Gibbsite相变先得χ-Al2O3,将其研磨(Pearl mill)降低其凝聚状态,再以重力分级(Gravity settling)处理得到3种不同粒径(90,165和265nm)的χ-Al2O3粉末,χ和κ混合相粉末3样品(粒径3.9,4.2和4.5μm),再将此3种χ-Al2O3粉分别热处理获得.研究结果显示由χ或κ相生成α相的相变温度与起始原料粒体大小有关,χ相组成粒体粒径越小,其相变温度越低且越明显.
The phase transition characteristics of χ-Al2O3 and χ-Al2O3 + κ-Al2O3 mixed phase particles in the transitional phase of alumina (Al2O3) were observed. The purpose of this study was to understand the effect of the size of the powder particles with the same transitional phase diameter on the formation and the amount of The samples were heat-treated by Gibbsite phase change precursor χ-Al2O3, the Pearl mill to reduce its aggregation state, and then Gravity settling treatment to give three different particle size (90,165 and 265nm) χ -Al2O3 powder, χ and κ mixed powder 3 samples (particle sizes of 3.9, 4.2 and 4.5 μm) were obtained, respectively, and the three kinds of χ-Al2O3 powders were respectively heat-treated.The results show that phase transformation of α phase from χ or κ phase The temperature is related to the size of the starting material. The smaller the particle size of the χ phase, the lower the phase transition temperature and the more obvious the phase transition temperature.