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热障涂层陶瓷层材料LnMgAl_(11)O_(19)(Ln=La,Nd)粉体的性能
李(王莹); 陈小龙; 孙超; 宫骏
2019-06-25
Source Publication材料研究学报
Volume33Issue:06Pages:409-418
Abstract用共沉淀法制备LnMgAl_(11)O_(19)粉体,证明了提高沉淀温度和pH值可使前驱粉体的性能明显提高。应用差热分析和X射线法研究了磁铅石相的生成温度和粉体的结晶度;使用Scherrer公式并结合XRD谱计算了晶粒尺寸;用扫描电镜观察了各工艺参数的前驱粉体在1500℃时效5 h后的形貌;使用Malvern ZEN3600粒度仪和Manual measurement软件分析了粉体硬团聚的尺寸分布;用Nd_2O_3, Gd_2O_3, Sm_2O_3替代La_2O_3,研究了制备多种镁基六铝酸盐粉体的可行性。结果表明:在pH值为11.5、沉淀温度为60℃条件下制备的前驱粉体,其完全相变为纯LaMgAl_(11)O_(19)粉体的初始温度为1440℃,比在常温下沉淀的前驱粉体降低了150℃,磁铅石相的生成效率明显提高。在1500℃时效5 h的粉体其晶粒为纳米尺度。提高沉淀温度和pH值有利于减小晶粒尺寸和降低粉体的热导率。采用相同工艺参数可制备出纯NdMgAl_(11)O_(19)粉体,其晶粒尺寸略大于LaMgAl_(11)O_(19)粉体的尺寸。
Keyword无机非金属材料 磁铅石相 镁基六铝酸镧 沉淀温度 沉淀pH值 晶粒尺寸
MOST Discipline CatalogueTG174.4 ; TQ174.758.16
Language中文
WOS SubjectTG174.4 ; TQ174.758.16
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/80497
Collection中国科学院金属研究所
Affiliation1.中国科学院金属研究所
2.中国科学院大学
3.暨南大学
Recommended Citation
GB/T 7714
李(王莹),陈小龙,孙超,等. 热障涂层陶瓷层材料LnMgAl_(11)O_(19)(Ln=La,Nd)粉体的性能[J]. 材料研究学报,2019,33(06):409-418.
APA 李,陈小龙,孙超,&宫骏.(2019).热障涂层陶瓷层材料LnMgAl_(11)O_(19)(Ln=La,Nd)粉体的性能.材料研究学报,33(06),409-418.
MLA 李,et al."热障涂层陶瓷层材料LnMgAl_(11)O_(19)(Ln=La,Nd)粉体的性能".材料研究学报 33.06(2019):409-418.
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