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Crystallization Behavior of Nd_2O_3 Doped Na_2O–CaO–SiO_2 Laser Glass-ceramics

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Journal of materials science & technology 2015年第11期31卷 1158-1160页

作者： shuming wang fenghua kuang Dazhan Zhang Xu Zhou Minghui Tang Department of materials science and engineering University of Science & Technology Beijing

For the desirable laser optical property, transition metals or rare-earths are always doped into parent glasses as active ions, and this doping will affect the crystallization of the precursor glasses inevitably. In this work, crystallization behavior of NaO-CaO-SiO2 system glasses doped with Nd2O3 was investigated. The crystallization kinetic parameters including the crystallization apparent activation energy （E） and the Avrami parameter （n） were also measured. The results show that the NaO-CaO-SiO2 system glassceramics with the NaxCa2Si3O9 crystal as primary phase can be highly crystalized as above 90%. The Nd2O3 doping has a significant influence on the crystallization apparent activation energy and the Avrami parameter, which affect the crystallization behavior and morphology of the transparent glass-ceramics of this system.

关键词： Crystallization behavior Activation energy Transparent Laser glass-ceramics

Laser Properties of Nd_2O_3 Doped Na_2O–CaO–SiO_2 Transparent Glass-Ceramics for Space Solar Energy

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Journal of materials science & technology 2016年第6期32卷 583-586页

作者： shuming wang fenghua kuang Qing Ye Yanxin wang Minghui Tang Changchun Ge Department of materials science and Engneering.university of science&{4. Beijing Beijing 100083.China

A series of Na20-CaO-SiO2 glass ceramics containing different content of Nd3＋ ions were prepared by the method of high temperature melting and subsequent crystallization. The absorption, excitation and emis- sion spectra of these glass ceramics were investigated; effects of Nd3＋ content and crystallization behavior on the laser properties of this material had been studied. The results show that the emission bands origi- nating from the 4.3/2 state of Nd3＋ were firstly enhanced with the increase of the Nd2O3 doping content and the crystallinity degree, and then decreased with more doping content and deepened crystalliza- tion. The possible reasons of this phenomenon were analyzed. Research will be favored to promote the development of glass ceramics laser materials for space solar energy.

关键词： Transparent glass-ceramics Laser property Space solar energy

Preparation and properties of a new porous ceramic material used in clean energy field

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Journal of materials science & technology 2019年第7期35卷 1255-1260页

作者： shuming wang Xiaofang Zhang fenghua kuang Jiangshan Li Yanxin wang Ruiping wang Yanru wang Xin Lin Jianming Li Department of materials science and engineering University of Science & Technology BeijingBeijing100083China Ceramic science Institute china Building materials Academy Beijing100024China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an710072China Bohai Shipyard Group Co. Ltd.Huludao125004China

At high tem perature, the oxide redox reactions of ceria can split H2O and CO2 to produce H2 and CO, so porous ceria with high temperature resistance and high specific surface area has an important foreground in clean energy applications. In this work, a reticulated porous ceria ceramic material with interconnected porous structure was prepared by the impregnation technique using organic polyurethane sponges as template. The influences of pretreated sponge, dipping time length, pore size and sintering temperature on the porosity and strength of the porous ceria ceramics were system atically studied. With the increasing sintering temperature, the glass phase occurred and led to an increase in strength, but an decrease in porosity. Eventually, we analyzed the relationships betw een porosity and strength of these porous materials, aiming to provide theoretical and practical references for its application in clean-energy field.

关键词： Porous ceramics Porous ceria Impregnation Clean-energy

Kinetic Analysis of Thermal Behavior of a New Transparent Glass-ceramics

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Kinetic Analysis of Thermal Behavior of a New Transparent Gl...