共查询到19条相似文献,搜索用时 687 毫秒
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本文通过对比不同的粉碎工艺、喷雾干燥条件和干压成形坯体质量,研究了压电陶瓷合成料的粉体制备工艺对其综合性能的影响,得到较好的压电陶瓷粉体制备技术。 相似文献
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《硫磷设计与粉体工程》2019,(5)
介绍了催化剂行业中常用的粉体制备工艺,通过分子筛粉磨与氯化镁粉磨两个工程实例,对不同粉磨工艺方案进行了对比,列举了装置投产后发现的问题,针对这些问题分析了原因,且提出了设计优化建议。 相似文献
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以市售高纯氧化物粉体为原料,采用固相反应烧结—埋粉热压后处理组合烧结工艺制备了直径为30mm、厚度为3.05mm的Nd3+∶Y3Al5O12(Nd∶YAG)透明陶瓷样品。研究了埋粉热压后处理工艺对Nd∶YAG陶瓷的光学性能、残留应力和光学均匀性等的影响。研究表明,通过将真空烧结后的Nd∶YAG陶瓷埋入BN粉体中进行热压后处理,克服了Nd∶YAG陶瓷在热压过程中容易碎裂及碳污染问题,并进一步排除了Nd∶YAG陶瓷内部的残留气孔,其透过率大于80%。埋粉热压后处理工艺对Nd∶YAG陶瓷的残留应力分布和光学均匀性没有影响。采用光纤耦合808nm激光二极管泵浦Nd∶YAG陶瓷样品,实现了连续瓦级激光输出,最高输出功率为3.6W,光光转换效率为20%。 相似文献
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以实验室自制SiO2粉体和商用Ce∶YAG荧光粉为玻璃原料,采用放电等离子体烧结(SPS)技术,在1 200℃保温2 min烧结得到有望用于白光LED封装的Ce∶YAG荧光玻璃。用X射线衍射仪(XRD)、荧光光谱(PL)等方法对制备获得的荧光玻璃样品进行表征。结果显示,烧结并没有破坏Ce∶YAG荧光粉的晶体结构,且荧光玻璃主体相仍为玻璃体,该荧光玻璃在460nm具有强吸收峰,在此波长激发下发射出530 nm左右的黄光。研究结果表明,本实验制备的Ce∶YAG荧光玻璃是一种具有重要应用前景的LED封装用新型荧光材料。 相似文献
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YAG晶体作为一种性能优越的激光材料,在性能的提升上存在着很多空间,而通过采用制备方法的改良是非常好的选择。溶胶凝胶法是近年来为制备功能材料的新方法,采用这种方法来制备块状Nd:YAG微晶玻璃是存在探索的意义与价值的。 相似文献
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F. Sommer F. Kern H.F. El-Maghraby M. Abou El-Ezz M. Awaad R. Gadow S.M. Naga 《Ceramics International》2012,38(6):4819-4826
Alumina composites containing 5, 10 and 20 vol.% YAG were produced by a slip-casting process. Two different routes for adding the YAG phase were chosen. Either by mixing of alumina with previously produced YAG powder or by coating of an adequate amount of yttria to form YAG precipitates during the calcining step. The mechanical properties of the sintered samples were measured and compared. Independent from the preparation route Al2O3/10 vol.% YAG composites showed best mechanical properties. Significant differences in the densification behavior appeared between the two different manufacturing technologies. The presence of intermediately formed phases like YAM and YAP during the powder preparation step of coated composites is probably the reason why mixed composites showed higher mechanical properties than coated composites. 相似文献
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溶胶-凝胶法制备YAG材料概述 总被引:3,自引:0,他引:3
YAG(Y3Al5O12)材料已被广泛应用于各个领域.YAG材料的制备一直备受人们的关注,它一般是通过固相反应方法得到的.由于Sol-gel(溶胶-凝胶)法具有合成温度低、物质反应活性高、各组分混合均匀性好、合成粉体的粒径小和分布窄等优点,用Sol-gel法制备YAG材料已引起了人们的重视.本文概述了近几年来采用Sol-gel法用不同原料制备YAG材料(纤维、发光粉和薄膜)以及它们的主要应用,并讨论了采用Sol-gel技术制备YAG纳米晶/玻璃复合材料的新技术. 相似文献
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《Journal of the European Ceramic Society》2020,40(7):2581-2585
The work presented here deals with the preparation of bulk yttrium aluminium garnet (YAG) glass-ceramics and YAG ceramics from glass microspheres with a YAG composition. Sol-gel prepared YAG powder was fed into a high temperature methane-oxygen flame where the particles melted and glass microspheres, with a YAG composition, were formed. Viscous flow sintering of the microspheres was then performed to prepare bulk YAG glass-ceramics or ceramics in a hot press.Rapid crystallization of YAG glass was traced during hot pressing through a change in the heating rate slope due to release of latent (crystallization) heat. This allowed control of crystallization and enabled preparation of YAG-based materials with different amounts of residual glass. YAG ceramic with relative density of 94.2 % was prepared at 891 °C without isothermal heating; additionally, YAG glass-ceramic reached relative density > 99 % at temperature 815 °C without isothermal heating. 相似文献
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M. Suárez A. Fernández J.L. Menéndez M. Nygren R. Torrecillas Z. Zhao 《Journal of the European Ceramic Society》2010,30(6):1489-1494
In this work, 1 at.% Nd doped Yttrium Aluminum Garnet Y3Al5O12 (YAG) nano-sized powder prepared by colloidal route was investigated thoroughly concerning agglomeration control and preparation of transparent ceramic by post-HIP. Electrostatic and mechanical deagglomeration process followed by freeze-drying turned out to be an effective method to alleviate agglomeration, yielding a powder with a homogeneous particle size distribution around 100 nm. Transparent Nd:YAG ceramic samples have been successfully prepared by post-HIP without the aid of sintering additives. The optical properties varied markedly with the sintering and hot isostatic pressing conditions used. In-line transmittance values of 56% at 680 nm and close to 80% in the infrared region were recorded. 相似文献
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分别采用水热和沉淀法制备ZnO光催化剂,利用X射线粉末衍射(XRD)和扫描电镜(SEM)对其物相和外貌进行分析观测.了解表征手段所反映的材料的物质结构信息。通过降解亚甲基蓝实验比较不同制备条件下所得ZnO的光催化性能。了解催化剂制备方法对其晶相、形貌及催化性能的影响。 相似文献