摘要
分别选用煤矸石、粉煤灰、黄沙、苏州土为硅源,工业氢氧化铝为铝源,氟化铝和五氧化二钒为添加剂,通过固相反应法原位合成了具有莫来石晶相的样品。采用X射线衍射仪和扫描电子显微镜对试样的物相结构和微观形貌进行了分析,研究了在不同的硅源下制备的试样性能及其结构的特征变化。结果表明:利用苏州土作为硅源能够合成具有针状形貌的莫来石晶相,分别以煤矸石和黄沙作为硅源合成了具有柱状形貌的莫来石和片状形貌的氧化铝晶相,而以粉煤灰作为硅源合成的主晶相为柱状的莫来石;并分别对不同硅源制备的试样的体积密度、显气孔率以及抗折强度进行了分析,探讨了莫来石的形成机理。
Mullite samples were in-situ synthesized by solid state reaction using coal gangue,fly ash,yellow sand,Suzhou clay as a silicon-source,industrial aluminum hydroxide as aluminum-source and Al F3 with V2O5as additives. The phase structure and microstructure of the samples were analyzed by Xray diffraction and scanning electron microscopy. The characteristics of the samples prepared under different silicon-source and their structural changes were studied. The results show that mullite crystal phase with acicular morphology is synthesized by using Suzhou clay as a silicon-source,and a columnar morphology of mullite and flaky morphology of alumina crystal phase can be obtained by using coal gangue and yellow sand as a silicon-source respectively,and the main crystal phase with fly ash as the siliconsource was columnar mullite. The bulk density,porosity and flexural strength of the samples prepared from different silicon-source were studied respectively,and the formation mechanism of mullite was discussed.
出处
《人工晶体学报》
CSCD
北大核心
2017年第9期1828-1832,共5页
Journal of Synthetic Crystals
基金
国家自然科学基金(51462016)
江西省研究生创新专项(YC2016-B081)
关键词
硅源
原位合成
莫来石
机理
silicon-source
in-situ synthesis
mullite
mechanism
