| 镁基六铝酸镧喷涂粉末制备及其热处理工艺研究 |
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| 引用本文： | 何明涛,孟惠民,王宇超,任鹏伟.镁基六铝酸镧喷涂粉末制备及其热处理工艺研究[J].粉末冶金技术,2018,36(5):370-376. |
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| 作者姓名： | 何明涛 孟惠民 王宇超 任鹏伟 |
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| 作者单位： | 北京科技大学新材料技术研究院, 北京 100083 |
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| 基金项目： | 国家重点基础研究发展计划（973计划）资助项目2014CB643302 |
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| 摘 要： | 采用固相反应法合成热障涂层用镁基六铝酸镧（LaMgAl11O19），通过离心喷雾干燥造粒制备LaMgAl11O19粉末，并对粉末进行热处理研究，将未热处理和热处理后的粉末通过等离子喷涂制备LaMgAl11O19涂层并在1100℃高温氧化1 h。通过场发射扫描电子显微镜、霍尔流量计、X射线衍射等方法对LaMgAl11O19粉末的微观形貌、流动性、松装密度、物相和涂层形貌进行了分析。结果表明:离心喷雾干燥造粒工艺获得了粒径均匀、流动性好的LaMgAl11O19球形粉末，但粉末颗粒内部结构疏松不致密；热处理能明显改善LaMgAl11O19球形粉末的流动性和致密度，并能有效的避免涂层分解、改善涂层成分、提高涂层的性能。本试验中的最佳热处理温度为1450℃，与未热处理粉末相比，经过1450℃热处理后粉末的流动性为12.1 s·50 g-1，流动时间缩短了19.9%，松装密度提高了83.4%；制备的涂层孔隙率更低，结构更为致密，有效的降低了喷涂过程中涂层非晶相的形成。
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| 关 键 词： | LaMgAl11O19 离心喷雾干燥 热处理 相对密度 涂层 |
| 收稿时间： | 2018-09-05 |
Study on preparation and heat treatment process of LaMgAl11O19 spray powder |
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| Affiliation: | Institute for Advance Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | Lanthanide magnesium hexaaluminate (LaMgAl11O19) synthesized successfully by solid-state reaction. LaMgAl11O19 powder was prepared by centrifugal spray-drying, and the powder was heat treated. The LaMgAl11O19 coating was prepared with unheated treatment powder and heat treatment powder by plasma spraying and oxidized at 1100℃ for 1h. The flowability and apparent density, microstructure and phase of LaMgAl11O19 powder were analyzed by Hall flowmeter, scanning electron microscope (SEM) and X-ray diffraction (XRD). The results show that centrifugal spray-drying obtained the uniform particle size and good fluidity LaMgAl11O19 spherical powder, and the internal structure of the powder was loose and not dense. The heat treatment of LaMgAl11O19 powder can improve the fluidity and relative density, and can avoid the decomposition of the coating effectively. The optimal temperature of heat treatment is 1450℃ in this test. Compared with the unheated treatment powder, the fluidity of the powder after heat treatment at 1450℃ is 12.1 s·50 g-1, the flow time is shortened by 19.9%, and the apparent density is increased by 83.4%. The coating prepared by the heat treatment powders have a lower porosity and a more compact structure, and reduces the formation of the amorphous phase during the spraying process effectively. |
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