YAG及Yb：YAG透明激光陶瓷的制备与光学性能研究

发布时间：2018-06-08 18:48

  本文选题：钇铝石榴石 + 真空烧结　； 参考：《广东工业大学》2015年硕士论文

【摘要】：钇铝石榴石(Y3Al5O12,YAG)具有非常好的机械性能和光学性能,是一种很理想的激光基质材料。有关的粉体制备技术,成型技术和透明陶瓷烧结制备技术一直是国内外关注的焦点。本论文主要研究了固相反应法和化学共沉淀法制备YAG及Yb:YAG透明陶瓷及其光学性能。研究工作主要包括以下几个方面：1.采用固相反应法通过真空烧结制备了YAG陶瓷,系统的研究球磨转速、添加剂用量、烧结工艺等因素对YAG透明陶瓷显微结构和光学性能的影响。实验结果表明,球磨转速为160 r/min时,球磨后粉体混合均匀,真空烧结制备出透明陶瓷晶粒尺寸较均匀,在可见光波段透光率达到60%；烧结助剂MgO的最佳添加量为0.1 wt%。烧结温度为1750℃,保温时间为5h时所制备的YAG透明陶瓷透光率最高。2.采用固相反应法通过真空烧结制备了Yb:YAG透明陶瓷,详细研究不同烧结温度和掺杂量对Yb:YAG透明陶瓷显微结构和光学性能的影响；同时尝试采用均相法制备球形Y203和Yb:Y2O3纳米粉体,然后与商业Al2O3和Yb2O3粉体混合真空烧结制备Yb:YAG透明陶瓷。结果发现,掺杂5 at%Yb时,陶瓷具有一定的透光率。所有样品在1700℃烧结后都只有YAG相,无其他杂质相。当掺杂浓度为1 at%时,最佳烧结温度为1650℃,比YAG陶瓷最佳烧结温度略低。采用先制备Yb:Y2O3纳米粉体,然后混合A1203粉体真空烧结所制备的Yb:YAG透明陶瓷透光率更高。3.采用化学共沉淀法合成YAG和不同掺杂浓度的Yb:YAG纳米粉体,随后通过真空烧结制备陶瓷。研究发现,略微增加反应溶液中铝离子的浓度,即当Y3+：Al3+浓度为9：16时,可形成不含杂相的纯立方相YAG纳米粉体,所得粉体分散性较好,形状为棒状,平均颗粒尺寸约为150 nm。利用此YAG纳米粉体可制备出具有一定透光率的YAG陶瓷；通过荧光光谱分析,掺杂30at%Yb3+并没有发生浓度猝灭效应,表明Yb可以实现高浓度掺杂,有利于制备出高功率的固体激光器。
[Abstract]:Yttrium aluminum garnet (Y3Al5O12YAGG) has very good mechanical and optical properties and is an ideal laser matrix material. Related powder preparation technology, molding technology and transparent ceramic sintering technology have been the focus of attention at home and abroad. In this paper, the preparation and optical properties of YAG and Yb: YAG transparent ceramics by solid state reaction and chemical coprecipitation were studied. The research work mainly includes the following aspects: 1. YAG ceramics were prepared by vacuum sintering by solid state reaction. The effects of milling speed, additive dosage and sintering process on the microstructure and optical properties of YAG transparent ceramics were studied systematically. The experimental results show that when the rotating speed of ball mill is 160 r/min, the powder is mixed uniformly, the grain size of transparent ceramics is uniform and the transmittance reaches 60 in the visible wave band, and the optimum addition amount of MgO is 0.1 wt. When the sintering temperature is 1750 鈩，

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