Influence of silica sources on morphology of mullite whiskers in Na_2SO_4 flux

摘要

The influence of crystalline form of silica on the morphology of mullite whiskers in Na_2SO_4 flux was studied. Isolated mullite whiskers with 5 mu m in average length were observed in the sample with amorphous and fused silica while clusters of mullite whiskers were obtained in the sample with quartz. Two distinct nucleation mechanisms were proposed to explain the morphology of the mullite whiskers.