Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Preparation method of high-emissivity LaMgAl11O19 ceramic
The invention relates to a preparation method of high-emissivity LaMgAl11O19 ceramic, and belongs to the technical field of preparation of lanthanum hexaaluminate ceramic materials. Firstly, La2O3 powder, Al (OH) 3 powder and Mg (OH) 2 powder are uniformly mixed, and hot-pressing sintering is carried out in a two-stage variable-speed heating mode and a pressurizing mode in the rear-stage heating process in a vacuum environment. The prepared LaMgAl11O19 ceramic is high in density, free of micro cracks on the surface, free of micro holes inside and pure in phase, and the spectral emissivity of the LaMgAl11O19 ceramic in the infrared band of 3-5 microns is greater than 0.9, so that the application requirements of the outer side thermal protection field of aerospace crafts and the energy-saving field of industrial kilns on the LaMgAl11O19 ceramic are met.
本发明涉及一种高发射率LaMgAl11O19陶瓷的制备方法，属于六铝酸镧陶瓷材料制备技术领域。先将La2O3粉体、Al(OH)3粉体和Mg(OH)2粉体混合均匀，再在真空环境下通过两段变速升温以及后段升温过程中加压的方式进行热压烧结，使所制备的LaMgAl11O19陶瓷致密度高、表面无微裂纹、内部无微孔洞、物相纯净，而且在3μm～5μm红外波段的光谱发射率大于0.9，满足航天飞行器外侧热防护领域以及工业窑炉节能领域对LaMgAl11O19陶瓷的应用需求。
Preparation method of high-emissivity LaMgAl11O19 ceramic
The invention relates to a preparation method of high-emissivity LaMgAl11O19 ceramic, and belongs to the technical field of preparation of lanthanum hexaaluminate ceramic materials. Firstly, La2O3 powder, Al (OH) 3 powder and Mg (OH) 2 powder are uniformly mixed, and hot-pressing sintering is carried out in a two-stage variable-speed heating mode and a pressurizing mode in the rear-stage heating process in a vacuum environment. The prepared LaMgAl11O19 ceramic is high in density, free of micro cracks on the surface, free of micro holes inside and pure in phase, and the spectral emissivity of the LaMgAl11O19 ceramic in the infrared band of 3-5 microns is greater than 0.9, so that the application requirements of the outer side thermal protection field of aerospace crafts and the energy-saving field of industrial kilns on the LaMgAl11O19 ceramic are met.
本发明涉及一种高发射率LaMgAl11O19陶瓷的制备方法，属于六铝酸镧陶瓷材料制备技术领域。先将La2O3粉体、Al(OH)3粉体和Mg(OH)2粉体混合均匀，再在真空环境下通过两段变速升温以及后段升温过程中加压的方式进行热压烧结，使所制备的LaMgAl11O19陶瓷致密度高、表面无微裂纹、内部无微孔洞、物相纯净，而且在3μm～5μm红外波段的光谱发射率大于0.9，满足航天飞行器外侧热防护领域以及工业窑炉节能领域对LaMgAl11O19陶瓷的应用需求。
Preparation method of high-emissivity LaMgAl11O19 ceramic
一种高发射率LaMgAl11O19陶瓷的制备方法
LIU LING (Autor:in) / MA ZHUANG (Autor:in) / LIU YANBO (Autor:in) / ZHU HAOLIN (Autor:in)
30.10.2020
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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