Development of Novel Functionally Graded Al_2O_3-Lanthanum Hexaaluminate Ceramics for Thermal Barrier Coatings

机译：用于热障涂层的新型功能梯度Al_2O_3-镧镧六铝酸盐陶瓷的开发

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Lanthanum hexaaluminate (LHA) has superior thermo-chemical stability at temperatures higher than 1000 ℃ and is a promising competitor to Y-ZrO_2-based thermal barrier coatings (TBCs). The yet unresolved problem is control of microstructure of high LHA content ceramics and adjustment of porosity upon, to arrive at a material exhibiting low thermal conductivity at high temperature combined with structural reliability. Therefore, a functionally graded alumina/lanthanum hexaaluminate (FGLHA) with a gradient in composition was developed. The thermal diffusivity and thermal conductivity of FGLHA were compared with the one of the monolithic composite ceramics. The alumina-rich composites showed excellent mechanical properties whereas the LHA-rich composites presented lower thermal conductivity.

机译：六铝酸镧（LHA）在高于1000℃的温度下具有出色的热化学稳定性，并且是基于Y-ZrO_2的热障涂层（TBC）的有希望的竞争对手。尚未解决的问题是控制高LHA含量的陶瓷的微观结构并调节孔隙率，从而获得一种在高温下显示出低导热率和结构可靠性的材料。因此，开发了具有梯度成分的功能梯度氧化铝/六铝酸镧（FGLHA）。将FGLHA的热扩散率和导热率与一种整体复合陶瓷进行了比较。富含氧化铝的复合材料显示出优异的机械性能，而富含LHA的复合材料显示出较低的热导率。

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《Multiscale, multifunctional and functionally graded materials》|2008年|P.97-102|共6页
会议地点 Sendai(JP)
作者
Zahra Negahdari; rnMonika Willert-Porada; rnFlorian Scherm;
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作者单位

Materials Processing, Faculty of Applied Science, University of Bayreuth, D-95447 Bayreuth, Germany;

rnMaterials Processing, Faculty of Applied Science, University of Bayreuth, D-95447 Bayreuth, Germany;

rnMetals and Alloys, Faculty of Applied Science, University of Bayreuth, D-95447 Bayreuth, Germany;

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原文格式 PDF
正文语种 eng
中图分类工程材料一般性问题;
关键词
lanthanum hexaaluminate; functionally graded materials; thermal properties; thermal barrier coatings;

机译：六铝酸镧功能分级材料；热性能;隔热涂料;

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专利

1. Thermal Crack Initiation Mechanisms on the Surface of Functionally Graded Ceramic Thermal Barrier Coatings [J] . K. Kokini, Y. R. Takeuchi, B. D. Choules Ceramics International . 1996,第5期

机译：功能梯度陶瓷热障涂层表面的热裂纹引发机理
2. Initiation of Surface and Interface Edge Cracks in Functionally Graded Ceramic Thermal Barrier Coatings [J] . Klod Kokini, Michael Case Journal of Engineering Materials and Technology . 1997,第2期

机译：功能梯度陶瓷热障涂层中表面和界面边缘裂纹的产生
3. LANTHANUM-LITHIUM HEXAALUMINATE - A NEW MATERIAL FOR THERMAL BARRIER COATINGS IN MAGNETOPLUMBITE STRUCTURE - MATERIAL AND PROCESS DEVELOPMENT [J] . Gerhard Pracht, Robert Vassen, Detlev Stover Ceramic Engineering and Science Proceedings . 2006,第3期

机译：镧-六水合铝酸锂-磁铅矿结构热障涂层的新材料-材料和工艺开发
4. Creep Response of Ceramic/Metal Functionally Graded Thermal Barrier Coating [C] . International Symposium on Multifunctional and Functionally Graded Materials(FGM2004) . 2005

机译：陶瓷/金属功能分级热屏蔽涂层的蠕变响应
5. Time-dependent behavior and thermal fracture in functionally graded thermal barrier coatings. [D] . Rangaraj, Sudarshan V. 2003

机译：功能梯度隔热涂层中随时间变化的行为和热断裂。
6. Increasing Fracture Toughness and Transmittance of Transparent Ceramics using Functional Low-Thermal Expansion Coatings [O] . Marc Rubat du Merac, Martin Bram, Jürgen Malzbender, -1

机译：使用功能性低热膨胀涂层增加透明陶瓷的断裂韧性和透光率
7. Isothermal aging characteristics of rare earth magnesium hexaaluminate based advanced thermal barrier coatings [O] . Premanshu Jana, Ponnarassery S Jayan, Santanu Mandal, 2018

机译：基于稀土镁的等温老化特征基于六脂素的高级热障涂层

Development of Novel Functionally Graded Al_2O_3-Lanthanum Hexaaluminate Ceramics for Thermal Barrier Coatings

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