【摘要】 本文通过XRD物相分析和SEM微观形貌分析研究了不同结合剂对矾土基可塑料物理性能的影响,探明了其结合机理。结果表明:矾土骨料最佳颗粒级配为:3¹ mm/≤1 mm/≤0.074 mm=47/18/25,其中软质粘土占骨料总质量的10%;其中以六偏磷酸钠和偏硅酸钠为结合剂的试样常温性能优于其他试样,试样在添加剂中引入了Na⁺和Ca²⁺,使得在试样在烧结中抑制了莫来石的形成,同时产生低熔物,提高烧结致密性,降低了显气孔率,导致其常温物理性能较好,但高温性能较差。更多还原

【Abstract】 The effcct of different additives on the phase transformation and mocro-morphology of high alumina bauxite was investigated by means of X-ray diffraction（ XRD） and scanning electron microscopy（ SEM）. The results indicated that the best particle size gradation is determined,which is 3-1 mm/ ≤1mm / ≤0. 074 mm = 47 /18 /25. The proportion of soft clay is 10% in aggregate. The combined strength of alumina plastic material combined by hexametaphosphate and sodium silicate is better than that of plastic materials combined by aluminum sulfate and aluminum dihydrogen phosphate. Because of additives containing Na⁺ and Ca²⁺,the samples inhibited the formation of mullite in the sintering process. At the same time,owing to the formation of glass phase,the densification of sintered samples was enhanced,but the porosity was decreased. As a result,the properties of this material is worse at high temperature,on the contrary,better at room temperature.更多还原