Improvement of thermally sprayed abradable coating by microstructure control
Improvement of thermally sprayed abradable coating by microstructure control
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DOI：
10.1016/j.surfcoat.2006.03.047
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发表时间：
2006-12
影响因子：
5.4
通讯作者：
H. Faraoun;T. Grosdidier;J. Seichepine;D. Goran;H. Aourag;C. Coddet;J. Zwick;N. Hopkins
中科院分区：
文献类型：
--
作者：
H. Faraoun;T. Grosdidier;J. Seichepine;D. Goran;H. Aourag;C. Coddet;J. Zwick;N. Hopkins
这项工作的目的是表征最近开发的耐磨材料的微观结构，用于在航空航天涡轮发动机的旋转部件和静止部件之间提供密封。研究材料为热喷涂AlSi-hBN和NiCrAl-膨润土两种复合粉末颗粒的涂层。用X射线衍射仪和扫描电子显微镜对涂层的微观结构进行了分析，并对涂层的结构元素进行了鉴定。这些结构元素：粗大的气孔率、金属结合相和嵌入的“可磨损”颗粒被用定量金相分析。特别是，已经建立了图像分析程序来量化与这些结构元素的形状、大小和取向分布有关的不同几何参数。
The aim of this work was to characterise the microstructure of recently developed abradable materials for providing a sealing between rotating and stationary parts in aerospace turbine engines. The investigated materials were two coatings obtained by thermal spraying of composite powder particles from the AlSi–hBN and NiCrAl–bentonite systems. X-ray diffraction and scanning electron microscopy were used to analyse the microstructure and identify the structural elements of the coatings. These structural elements: the coarse porosities, the metallic binding phase and the embedded “abradable” particles were analysed by quantitative metallography. In particular, an image analysis procedure has been established to quantify different geometrical parameters related to the shape, size and orientation distribution, of these structural elements.