Effect of the addition of glasses as sintering aids on microstructure and properties of nanoalumina

ABSTRACT Alumina-Glass compositions were prepared to evaluate the effect of glass as sintering aids. The composites showed densification below 1100°C. The highest density values (~95%) were obtained for compositions based respectively on borosilicate (G2 and G3) and soda lime glasses (G4), all [A1] [A2] containing Na in the precursor powder. Samples G1 (K-based) and G5 (no K or Na in the precursor glass powder) presented irregular morphology with the presence of intergranular porosity. The composition G2, G3, and G4 presented uniform morphology corresponding to higher densification.

摘要 本研究制备了氧化铝-玻璃复合材料，以评估玻璃作为烧结助剂的作用效果。该类复合材料可在1100℃以下实现致密化。分别以硼硅酸盐玻璃（G2、G3）和钠钙玻璃（G4）为基体的复合材料获得了最高的致密度（约95%），所有[A1][A2]试样的前驱体粉末中均含有钠元素。试样G1（钾基体系）与G5（前驱体玻璃粉末中不含钾、钠元素）的形貌不规则，且存在晶间孔隙。而G2、G3、G4组分配制的试样形貌均匀，对应更高的致密化程度。