摘要
YAG具有许多独特的性能,应用非常广泛。利用水热沉淀法制备超细YAG粉体,研究合成工艺对粉体形貌的影响,并采用合成的超细YAG粉体制备YAG多孔陶瓷,结果显示:盐碱摩尔比Y^(3+)∶OH^-=1∶8时,能够得到形貌比较均匀的颗粒,当继续增大盐碱摩尔比时,得到的粉体形貌没明显变化。反应时间越长,颗粒尺寸越粗大。Y^(3+)的浓度越小,颗粒尺寸越细小。通过实验,在反应温度为200℃、反应时间为2 d和盐碱摩尔比为1∶8的条件下,所得到棒状颗粒为多晶体结构,它的直径大约是150 nm,长度大约为4000 nm,通过XRD检测,粉体纯度较高。随着陶瓷坯体烧结温度的提升,YAG多孔陶瓷气孔率呈现下降趋势,而抗压强度随之升高。结合气孔率、抗压强度和显微孔结构综合考虑,利用水热沉淀法合成的棒状超细YAG粉体烧结制备YAG多孔陶瓷的烧结温度确定为1500℃较为适宜。
YAG has a number of unique properties, the application is very extensive. The superfine YAG powder was prepared by hydrothermal precipitation method. The influence of synthesis process on the morphology of the powder and YAG porous ceramics were investigated. The results show that when the molar ratio of salt to alkali that y3 ＋ ： OH- is 1 ： 8, the more uniform morphology of the particles can be prepared, when the molar ratio of salt to alkali is increased, the morphology of the particles will not change. The reaction time is longer, the particle size will be thicker. The smaller the concentration of y3~ ions, the particle size will be small. The experimental results show that the rod-like particles have a polycrystal structure at the reaction temperature of 200 ℃, reaction time of 2 d and the molar ratio of salt to alkali of 1 ： 8. The diameter of the rod-like particles is about 150 nm and the length is about 4000 nm. The purity of powder is higher through the test of XRD. As the sintering temperature increases, the porosity of YAG porous ceramic decreases, while the compressive strength increases. Combined with the porosity, compressive strength and pore microstructure, the sintering temperature of prepared YAG porous ceramics using rod-shaped ultrafine YAG powders via hydrothermally precipitated method is determined to be 1500 ℃.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2018年第2期343-347,共5页
Journal of Synthetic Crystals
基金
国家自然科学基金(51202171)
中国博士后科学基金(2013M540611)
江西省教育厅科技基金(GJJ171133)
江西省科技厅平台建设基金(20161BCD40011)
关键词
YAG
水热沉淀法
超细粉体
合成工艺
多孔陶瓷
YAG
hydrothermal precipitation ceramic method
ultra-fine powder
synthesis technology
porous
