Phase transformation and morphology evolution of sepiolite fibers during thermal treatment

海泡石 材料科学 高分辨率透射电子显微镜 方石英 扫描电子显微镜 差示扫描量热法 相(物质) 大气温度范围 顽火辉石 矿物学 煅烧 化学工程 差热分析 热重分析 鳞石英 分析化学(期刊) 透射电子显微镜 化学 复合材料 衍射 有机化学 纳米技术 原材料 石英 热力学 天文 球粒陨石 催化作用 陨石 工程类 物理 光学
作者
Yuedan Zhang,Wang Lijuan,Fei Wang,Jinsheng Liang,Songsong Ran,Jianfeng Sun
出处
期刊:Applied Clay Science [Elsevier BV]
卷期号:143: 205-211 被引量:35
标识
DOI:10.1016/j.clay.2017.03.042
摘要

In this study, the phase transformation and micromorphology evolution of sepiolite fibers were studied along with the increase of temperature from 300 to 1300 °C, using raw sepiolite samples as raw materials. Through characterization by scanning electron microscope (SEM), high resolution transmission electron microscope (HRTEM), X-ray diffraction (XRD), thermo-gravimetric analysis (TGA/DTG) and differential scanning calorimeter (DSC), it was found that the determined transition temperature values for the dehydrations of the hygroscopic water and the zeolitic water were 120 °C and 340 °C, and the values for the dehydration of the bound water and the dehydroxylation of the hydroxyls were about 500 °C and 810 °C. Moreover, orthoenstatite (MgSiO3) was recrystallized from dehydroxylated phase at 852 °C and then transformed into protoenstatite at 970 °C, and enstatite crystals grew along with c-axis of the fiber with the increase of temperature. Amorphous phase as the other phase of sepiolite dehydroxylation recrystallized into cristobalite in the temperature range of 1130–1200 °C and the samples began to melt at the above temperature range. In terms of morphology, both sepiolite bundles and laths remained constant after heating up to 1000 °C and sintering phenomenon appeared when the temperature was up to 1100 °C. The bundles partly melted and adhered each other, which further formed a porous structure after calcination at 1200 °C. When the temperature was up to 1300 °C, the sample substantially melted except for a small amount of enstatite and cristobalite crystals. The present study reflects the thermal reaction of sepiolite, which could be applied in exploring the reinforcement mechanism of sepiolite reinforced ceramic body composites.
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