摘要
The crystallization behavior and mechanism of CaO–Al2O3–MgO–SiO2(CAMS)-based diopside glass ceramics with nano-ZrO2 nucleators and CeO2 agents have been investigated.The use of nanoscale ZrO2 as nucleators is favorable to the crystallization of glass ceramic at a relatively lower temperature due to the reduction of the activation energy, while the activation energy is increased after adding the CeO2 agent.The microstructure and orientation have been analyzed by scanning electron microscopy and electron backscatter diffraction.Two discernible layers are observed, featured in glass and crystalline phases, respectively.Remarkably textured polycrystalline diopsides are verified for the samples(A and B)free of CeO2 agents, with c-axes perpendicular to the interface of the two layers.Comparatively, the c-axes of diopside grains of the sample(C) with CeO2 agents are proved to be parallel to the interface.Nanocrystals are detected in the vicinity of the interface for sample C.
The crystallization behavior and mechanism of CaO–Al2O3–MgO–SiO2（CAMS）-based diopside glass ceramics with nano-ZrO2 nucleators and CeO2 agents have been investigated.The use of nanoscale ZrO2 as nucleators is favorable to the crystallization of glass ceramic at a relatively lower temperature due to the reduction of the activation energy, while the activation energy is increased after adding the CeO2 agent.The microstructure and orientation have been analyzed by scanning electron microscopy and electron backscatter diffraction.Two discernible layers are observed, featured in glass and crystalline phases, respectively.Remarkably textured polycrystalline diopsides are verified for the samples（A and B）free of CeO2 agents, with c-axes perpendicular to the interface of the two layers.Comparatively, the c-axes of diopside grains of the sample（C） with CeO2 agents are proved to be parallel to the interface.Nanocrystals are detected in the vicinity of the interface for sample C.
作者
Yan Zhang
Yu Shi
Xuefeng Zhang
Fengxia Hu
Jirong Sun
Tongyun Zhao
Baogen Shen
张艳;石钰;张雪峰;胡凤霞;孙继荣;赵同云;沈保根(State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;University of Chinese Academy of Sciences, Beijing 100049, China;Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, China)
基金
Project supported by the National Natural Sciences Foundation of China(Grant No.51590881)
the National Key Research Program of China(Grant No.2016YFB0700903)
the Inner Mongolia Science and Technology Major Project of China 2016
the Fujian Institute of Innovation,Chinese Academy of Sciences(Grant No.FJCXY18040302)
