核壳纳米粉体制备Y_(2)O_(3)-MgO复相陶瓷  

Y_(2)O_(3)-MgO Composite Nano-ceramics Prepared from Core-shell Nano-powders

作　　者：江宏涛 秦海明[2,3] 冯少尉 陈红兵 蒋俊[2,3] JIANG Hong-tao;QIN Hai-ming;FENG Shao-wei;CHEN Hong-bing;JIANG Jun(School of Materials Science and Chemical Engineering,Ningbo University,Ningbo 315201,China;Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China;University of Chinese Academy of Sciences,Beijing 100049,China;National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology,CAS Key Laboratory of Green Process and Engineering,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]宁波大学材料科学与化学工程学院,浙江宁波315201 [2]中国科学院宁波材料技术与工程研究所,浙江宁波315201 [3]中国科学院大学,北京100049 [4]中国科学院过程工程研究所,湿法冶金清洁生产技术国家工程实验室,中科院绿色过程与工程重点实验室,北京100190

出　　处：《发光学报》2021年第7期997-1006,共10页Chinese Journal of Luminescence

基　　金：国家重点研究发展项目(2017YFC0111602,2016YFC0104502);国家自然科学基金(12074393);中国科学院福建省创新研究院(FJCXY18040203);浙江省重点研究开发项目(2021C01024);浙江省自然科学基金(LQ21E020007);宁波市自然科学基金(202003N4346);内蒙古自治区科技计划(2019GG263)资助项目。

摘　　要：由于优异的光学和机械性能,Y_(2)O_(3)-MgO复相纳米陶瓷被认为是红外透明陶瓷的重要候选材料。尽管如此,在近红外和中红外波段严重的光散射和不必要的吸收方面仍然存在巨大的挑战,这阻碍了该材料在极端恶劣环境中的应用。在目前的工作中,先通过尿素沉淀法制备了Y_(2)O_(3)-MgO核壳结构纳米粉体,然后在放电等离子体烧结下制备了Y_(2)O_(3)-MgO复相纳米陶瓷。通过热重和差示扫描量热法(TG/DSC)、X射线衍射和扫描电子显微镜分析了核壳结构纳米粉及复相纳米陶瓷。Y_(2)O_(3)-MgO核壳结构纳米粉体的尺寸约为250 nm,并且制备的陶瓷的平均晶粒尺寸约为360 nm。透过率在6μm处为57%,维氏硬度为820 HV。粉末合成方法为复相纳米陶瓷提供了一种新颖的解决方案,可以轻松调节粒径和不同组分的比例。Y_(2)O_(3)-MgO composite nano-ceramics are regarded as a significant candidate of infrared transparent ceramics on account of excellent optical and mechanical properties.Nevertheless,a huge challenge remains regarding the critical optical scattering and needless absorption in the near-and mid-infrared bands,which hinders its applications in extreme harsh environments.In present work,Y_(2)O_(3)-MgO core-shell structure nano-powders were prepared via urea precipitation method before that Y_(2)O_(3)-MgO composite nano-ceramics were prepared under spark plasma sintering.Thermogravimetric and differential scanning calorimetry(TG/DSC),X-ray diffraction and scanning electron microscope were performed to analyze as prepared core-shell structure nano-powders and composite nano-ceramics.The size of Y_(2)O_(3)-MgO core-shell structure nano-powders is about 250 nm,and average grain size of the prepared ceramics is approximately 360 nm.The transmittance is 57%at 6μm,and the Vickers hardness is 820 HV.The powder synthesis method accomplished in present work offers a novel solution for composite nano-ceramics,which easily regulate particle size and proportion of different components.

关 键 词：Y_(2)O_(3)-MgO复相纳米陶瓷 核壳结构纳米粉体 尿素沉淀法 放电等离子烧结 

分 类 号：O482.31[理学—固体物理]