煅烧温度对共沉淀法制备热障涂层用LaMgAl11 O19 前驱粉末性能的影响
刘冬梅1 , 李超2
1.赤峰工业职业技术学院 建筑工程系,赤峰 024005; 2.中国科学院金属研究所,沈阳 100162
Effect of temperature of coprecipitation on properties of LMA precursors for thermal barrier coatings
LIU Dongmei1 , LI Chao2
1. Department of Architectural Engineering, Chifeng Polytechnic College, Chifeng 024005, China; 2. Institute of metals, Chinese Academy of Sciences, Shenyang 100162, China
摘要 采用共沉淀法制备热障涂层用LaMgAl11 O19 前驱粉末(沉淀温度80 ℃,沉淀pH值10.5),测试分析煅烧温度对粉末组织形貌和物相组成的影响。研究结果表明:经过1 100 ℃煅烧,粉体由MgAl2 O4 ,LaAlO3 和La2 O3 相组成,随煅烧温度上升至1 500 ℃,形成了具有单一LaMgAl11 O19 物相结构。所制备的LaMgAl11 O19 粉体粒径介于3~5 μm,厚度为0.5~1.0 μm。伴随煅烧温度上升,Mg1s,O1s,La3d和Al2p的电子结合能出现波动,向高能端发生明显位移。当到达1 500 ℃时,Mg,La和Al的电子结合能均增大。在XPS谱图上形成O1s,La3d,Mg2p和Al2p主电子峰,Mg,La和Al被氧化。在LaMgAl11 O19 晶体内形成了互相交错结构的层状组织,表现为明显的各向异性特征。当煅烧温度上升到1 300 ℃时,La2 O3 键数量逐渐减小。
关键词 :
共沉淀 ,
前驱粉末 ,
LaMgAl11 O19 ,
微观组织 ,
谱强
Abstract :LaMgAl11 O19 precursor powder for thermal barrier coating was prepared by co-precipitation method (precipitation temperature 80 ℃, precipitation pH value 10.5). The influence of calcining temperature on its microstructure, half-peak full width and spectral strength was tested and analyzed. The results showed that the powder has MgAl2 O4 , LaAlO3 and La2 O3 three phases after calcining at 1 100 ℃. As the calcining temperature rise to 1 500 ℃, the LaMgAl11 O19 phase is abtained. The particle size of LaMgAl11 O19 is between 3 and 5 μm and its thickness is 0.5 to 1.0 μm. When the calcination temperature continues to rise, the electron binding energy of Mg1s, O1s, La3d and Al2p fluctuates and shifts significantly towards the high-energy end. At 1 500 ℃, the electron binding energies of Mg, La and Al all increased. The main electron peaks of O1s, La3d, Mg2p and Al2p were formed on the XPS spectrogram, and Mg, La and Al were oxidized. LaMgAl11 O19 crystal has formed a layered structure with interlaced structure, which is obviously anisotropic. As the calcination temperature rises to 1 300 ℃, the number of La2 O3 bonds gradually decreases.
Key words :
co-precipitation
precursor powder
LaMgAl11 O19
microstructure
spectrum is strong
收稿日期: 2019-05-20
出版日期: 2020-06-19
基金资助: 国网沈阳省科技项目(5212HD170005)
通讯作者:
刘冬梅,讲师。电话:13832764641;E-mail: gangrang21foba@126.com
引用本文:
刘冬梅, 李超. 煅烧温度对共沉淀法制备热障涂层用LaMgAl11 O19 前驱粉末性能的影响[J]. 粉末冶金材料科学与工程, 2020, 25(1): 40-44.
LIU Dongmei, LI Chao. Effect of temperature of coprecipitation on properties of LMA precursors for thermal barrier coatings. Materials Science and Engineering of Powder Metallurgy, 2020, 25(1): 40-44.
链接本文:
http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2020/V25/I1/40
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