【摘要】 用氧化铝溶胶为结合剂，采用喷雾干燥技术制备球形粉料．粉料形貌受干燥热空气的温度和颗粒尺寸的影响，降低空气温度和减小颗粒尺寸有利于获得具有完整球形的粉料．造粒的粉料；分别经８００～１６００℃煅烧得到不同热处理的粉料．用ＸＲＤ，ＴＧ－ＤＴＡ分析了氧化铝溶胶和造粒粉料的相组成和相变化，ＳＥＭ观察了粉料形貌，单侧加压干压法评估了粉料抗破坏性，结果表明，氧化铝溶胶不仅起到常规粘合剂的作用，而且对喷雾造粒的氧化铝颗粒起到促烧结作用，使粉料经１２００～１３００℃的低温煅烧下即可获得良好的抵抗外力破坏能力，适用于挤出成型制备多孔支撑体。更多还原

【Abstract】 Alumina granules were prepared by spray-drying technique with alumina-sol as the binder. The granule morphology is influenced by inlet temperature and the granule size. The decrease of inlet temperature and granule size benefits the granule morphology perfectible. Spray- dried granules were calcined at 800～1600°C, respectively. XRD and TG-DTA were carried out to analyze the phases of alumina-sol and granules. SEM was used to observe the granules calcined at different temperatures. The strength of granules was tested by the die pressing method. The results show that the alumina-sol not only acts as a common binder at room temperature but also improves the sintering behaviors of a-alumina, so as to make granules get good strength for extrusion as low as 1200～l300°C.更多还原