Low-temperature formation and oxidation resistance of ultrafine aluminide coatings on Ni-base superalloy
Low-temperature formation and oxidation resistance of ultrafine aluminide coatings on Ni-base superalloy
复制标题
镍基高温合金超细铝化物涂层的低温形成及抗氧化性能
DOI：
10.1016/j.surfcoat.2009.02.127
复制
发表时间：
2009-05-30
影响因子：
5.4
通讯作者：
Dai, Yongnian
中科院分区：
文献类型：
--
作者：
Zhan, Zhaolin;He, Yedong;Dai, Yongnian
采用改进的固体渗铝工艺，在540-600 ℃温度范围内，在Ni-18Fe-17 Cr高温合金表面成功地制备了超细铝化物涂层。反复球的影响加速形成的铝化物涂层的表面精炼过程中，导致原子扩散发生在一个相对较低的温度。研究了操作温度和处理时间对涂层形成的影响。涂层具有双层结构。大约5 μ m厚的顶层显示出等轴粗晶粒，主要由NiAl（3）和少量的Fe（2）Al（5）和CrAl（5）组成。底层显示出高密度、均匀的超细颗粒，直径约为30-50 nm。高温氧化试验在1000摄氏度下进行。研究了氧化动力学和氧化膜的微观结构。实验结果表明，涂层显著提高了Ni-18Fe-17 Cr合金的抗高温氧化性能。(C)2009爱思唯尔有限公司版权所有。
Ultrafine aluminide coatings were successfully produced on Ni-18Fe-17Cr superalloy at 540-600 degrees C in a modified pack-aluminizing process. Repeated ball-impacts accelerated the formation of the aluminide coatings by a surface refining process, resulting in atomic diffusion occurring at a relatively low temperature. The effects of the operation temperature and the treatment duration on the formation of the coatings have been investigated. The coatings possessed a two-layer structure. The top layer, approximately 5 mu m in thickness, exhibited equiaxial coarse grains and was dominated by NiAl(3), with small amounts of Fe(2)Al(5) and CrAl(5). The bottom layer showed high density, homogeneous, ultrafine grains with diameters approximately 30-50 nm. High-temperature oxidation tests were carried out at 1000 degrees C. The oxidation kinetics and microstructure of the oxide scale were studied. The experimental results indicated that the coatings greatly enhanced the high-temperature oxidation resistance of Ni-18Fe-17Cr superalloy. (C) 2009 Elsevier B.V. All rights reserved.