摘要
以商业高纯Al_(2)O_(3)粉和自制纳米Y_(2)O_(3)粉为原料,采用真空固相反应烧结法成功制备出了高透光的钇铝石榴石(YAG)透明陶瓷。研究了反应烧结过程中物相演变和显微结构变化,烧结温度和保温时间对YAG透明陶瓷光学透过率的影响以及YAG透明陶瓷在深海装备领域的应用性能等。结果表明:高温条件下,Al_(2)O_(3)和Y_(2)O_(3)反应先依次形成中间相YAM和YAP,最终在1500℃完全形成YAG;随着烧结温度的升高,YAG陶瓷内气孔不断排出且晶粒不断长大,光学透过率先增加后降低,在1780℃透过率达到最高;随着保温时间的延长,YAG陶瓷的透过率逐渐提高,但超过6 h后,再延长保温时间,对提高透过率的效果不显著。采用优化工艺制备的YAG透明陶瓷球罩经受住127 MPa抗压模拟试验,并成功应用在深海领域装备大功率LED照明灯和摄像机保护罩上,为拍摄“奋斗者”号万米海底作业以及央视现场直播做出了贡献。
Introduction Deep sea equipment is an important guarantee for the exploration,development,and protection of deep-sea resources,including various types of deep-sea submersibles,landers,gliders,and their auxiliary equipment.In the deep-sea equipment above,the transparent protective cover for observation windows,cameras,and lighting must use high-strength transparent materials.The main transparent materials currently used are ultra-thick organic glass(observation window),inorganic glass,and sapphire(single crystal aluminum oxide).Their application in deep-sea equipment is possible due to the superior transparency of yttrium aluminum garnet(YAG)transparent ceramics like single crystals,as well as the characteristics of optical isotropy,high strength,high thermal conductivity,and stable physical and chemical properties.At present,there are many kinds of transparent ceramics,among which YAG transparent ceramics are the most representative.The existing researches on YAG transparent ceramics mainly focus on doping rare-earth elements to achieve optical functional applications,such as laser output,white LED luminescence,etc..There are a few reports on the research of large-sized and complex shaped YAG transparent ceramics.In this paper,large-sized and complex shaped YAG transparent ceramics were prepared by a solid-state reaction sintering method,which could be applied to deep-sea equipment at 10000 meter.Methods High-purity powders ofα-Al_(2)O_(3)(99.99%purity,Taimei Co.,Japan),Y_(2)O_(3)(self-synthesized by co-precipitation method)were used as starting materials.The starting powders were weighed according to a stoichiometric ratio of YAG,and then mixed with 0.5%tetraethyl orthosilicate(TEOS,99.99%)and 0.05%MgO powder(analytical pure)as a sintering additive in ethanol by ball milling for 12 h.The mixtures were dried in an oven at 60℃for 24 h and then sieved through 200-mesh screen.A portion of the dried powder was calcined at 900–1500℃,and another part of the powder was pressed into circular discs with a diameter
作者
覃显鹏
周国红
王正娟
胡松
黄德信
王士维
QIN Xianpeng;ZHOU Guohong;WANG Zhengjuan;HU Song;HUANG Dexin;WANG Shiwei(Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2024年第3期739-745,共7页
Journal of The Chinese Ceramic Society
基金
国家重点研发计划项目(2018YFC0307903,2018YFC0308100)。
关键词
钇铝石榴石
透明陶瓷
固相反应
烧结
深海应用
yttrium aluminum garnet
transparent ceramics
solid-state reaction
sintering
deep-sea application
