共查询到19条相似文献,搜索用时 78 毫秒
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钇铝石榴石(YAG)激光透明陶瓷由于具有单晶、玻璃激光材料无可比拟的优势而成为研究热点,并得到迅速发展,高性能的稀土元素掺杂YAG透明激光陶瓷被相继报导.本文综述了近年来国内外关于YAG激光透明陶瓷的最新研究成果.主要包括YAG微细粉体合成、烧结添加刺及多晶YAG透明陶瓷的致密化烧结技术,并对比了YAG透明陶瓷相对于Y... 相似文献
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成型是钇铝石榴石(YAG)透明陶瓷研制的关键环节,对透明陶瓷的致密化过程及其力学、热学和光学性能有重要影响。本工作围绕YAG透明陶瓷的基于数字光处理(DLP)技术的光固化3D打印成型,系统地开展了YAG陶瓷浆料的研制、陶瓷生坯的构筑及坯体脱脂和烧结工艺研究。采用流变仪分析了固含量对陶瓷浆料流变特性的影响,借助分析曝光参数对单层陶瓷膜特性的影响,确立了最佳的光固化工艺参数。结合TG–DTA分析,对陶瓷坯体脱脂制度进行了精准控制。采用真空高温烧结工艺制备得到高致密YAG透明陶瓷,讨论了固含量、烧结温度等工艺参数对YAG透明陶瓷微结构演变及光学质量的影响,基于DLP光固化成型技术成功制备出可见光透过率高达82.9%的高性能YAG透明陶瓷。 相似文献
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Avital Wagner Barak Ratzker Sergey Kalabukhov Ehud Galun Moshe P. Dariel Nachum Frage 《Israel journal of chemistry》2020,60(5-6):550-556
Doped transparent ceramics have potential for a wide range of optical applications derived from their easily controllable fluorescence properties. The aim of this contribution is to present and discuss an effective fabrication method for doped transparent yttrium aluminum garnet ceramics. The powder synthesis route was adapted from common co-precipitation methods and the powder densification was performed by spark plasma sintering. Parameters of the fabrication process were optimized for different lanthanide dopants in order to obtain highly transparent single- and multi-doped ceramics. The photoluminescence properties of the samples were measured and discussed. The use of lithium fluoride as a sintering additive was confirmed to be favorable and post-sintering heat treatments were shown to be necessary for certain dopants. Finally, the photoluminescence lifetime of dopants in a multi-doped sample were measured and the energy transfer efficiency between dopants was determined. 相似文献
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《Ceramics International》2020,46(13):20847-20855
Nd-doped YAG transparent ceramics were prepared by microwave sintering. In this paper, the green bodies from high-purity commercial powders were sintered from 900 °C to 1750 °C for different lengths of time (0.5–2 h) by microwave heating. By optimizing the microwave heating parameters (the heating rate at different stages of microwave sintering, sintering temperature and holding time), the microstructures and optical properties of transparent ceramics can be effectively improved. The phase transformation, densification process and optical properties of Nd:YAG transparent ceramics were discussed. The liquid phases strongly absorb microwave radiation and affect the sintering results of samples during microwave sintering. The highest in-line transmittances of Nd:YAG transparent ceramic fabricated at 1750 °C for 2 h were 76.5% at 400 nm and 80.6% at 1064 nm. The fluorescence emission spectra and lifetime depending on different heating conditions were also discussed. 相似文献
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综述了透明AlON陶瓷材料的制备工艺、透光性影响因素、主要应用及研究现状.指出透明AlON陶瓷已经成为各国材料学科领域和军事领域竞相研究的热点,透光性能好的AlON材料的研制和开发是制约我国在该领域发展的核心技术. 相似文献
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Haomin Wang Zhongwen Lu Zhiyong Huang Julie Cedelle Qingyuan Wang 《Ceramics International》2018,44(11):12472-12476
Traditional micro-sized and nano-sized YAG transparent ceramics were tested by nanoindentation at different peak loads. The micro-sized YAG transparent ceramics show a marked indentation size effect (ISE). However, for the nano-sized YAG transparent ceramics, the hardness was constant in the whole investigated range without any evidence of ISE. We show that the absence of indentation size effect for nano-sized YAG transparent ceramics can be accurately modeled using the plastic deformation mechanism of grain boundary sliding. 相似文献
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Weiwei Li Haijun Huang Bingchu Mei Cong Wang Jie Liu Shaozhao Wang Dapeng Jiang Liangbi Su 《Journal of the American Ceramic Society》2020,103(10):5787-5795
Ytterbium-doped calcium fluoride transparent ceramics is considered as a promising laser gain medium. How to prepare low scattering loss ceramics is the main challenge at present. In this study, a simple route of hot-pressing method was introduced to fabricate high optical quality of Yb: CaF2 laser ceramics with different concentration of Yb ions. The influence of Yb concentration on the particle sizes of the powders, microstructure, fluorescence spectra, output power, and laser emitting spectra of Yb: CaF2 transparent ceramics was discussed. About 976 nm LD pumped CW laser operation has been demonstrated in 1, 2, 4, and 5 at.% Yb doped CaF2 ceramics. A maximum average output power of 0.809 W was obtained for the 5 at.% Yb: CaF2 ceramics with the slope efficiency was 26%. 相似文献
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High-entropy ceramics have been widely explored and extensively studied since the first demonstration of the configuration entropy stabilized reversible transitions between multiple and single phases by Rost et al. in 2015. Most of the current research on high-entropy ceramics has focused on properties like thermal conductivity, thermoelectricity, structures, and others. Some recent studies have extended the high-entropy concept to the field of transparent ceramics. We reviewed these papers and proposed four potential ceramics groups for high-entropy transparent ceramics including fluoride ceramics, fluorite-deficient and/or ordered pyrochlore A2B2O7 ceramics, garnet ceramics, and sesquioxide ceramics. In this article, we review ceramic powder synthesis, the fabrication of transparent ceramics, high-entropy ceramics, and limited cases of high-entropy transparent ceramics for each category. High-entropy transparent ceramics with diverse compositions and structures will provide more possibilities for functional transparent ceramics in the future. 相似文献
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《Journal of the European Ceramic Society》2019,39(16):5260-5266
Transparent KSr2Nb5O15 (KSN) lead-free ferroelectric ceramics have been synthesized via modified pressureless sintering method. A significant photochromic effect was observed for the transparent KSN ceramics prepared without rare-earth dopant modification. The piezoelectric properties depend on the grain orientations were investigated. The optical transmittance of the KSN ceramics is greater than 40% in the wavelength range of 530–800 nm. After NUV irradiation, the absorbance was enhanced by more than 40% in a broad visible range (more than 79%). The absorbance returned to the initial value after a thermal bleaching process. The results of the cycling tests and response experiments showed the stability and saturation of the photochromic effect. In addition, the possible photochromic mechanism of the KSN ceramics is discussed and the photochromic centers are identified. This transparent KSN ceramics exhibits an obvious photochromic effect and is a potential candidate materials for optical data storage and information recording applications. 相似文献