料浆法制备NiCrW基高温合金Al-Si涂层的微观结构与性能

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摘要航空发动机涡轮叶片在使用时需加以涂层防护,以提高基体合金的抗高温氧化性能。本研究采用料浆渗铝的制备工艺,以CaCl₂作为活化剂,在NiCrW基高温合金表面制备Al-Si涂层。采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)及能谱仪(EDS)对涂层试样的表面和截面进行分析。结果表明,聚乙烯醇水溶液可作为料浆法制备渗铝/铝硅涂层的有效黏结剂;高温扩散的温度和时间显著影响渗铝涂层的厚度。渗剂成分为5%Si+30%Al(质量分数),制备得到的共渗涂层由外而内依次为富Al层、NiAl层和含Si过渡层三部分,涂层致密无明显缺陷,厚度约为57 μm。10%Si+25%Al、15%Si+20%Al与20%Si+15%Al共渗涂层由外而内分为富Al层、富Ni层和含Si过渡层三层。Si元素主要以含Si的沉积相形式存在于含Si过渡层中,少量沉积于外层。而Si的少量添加能明显影响Al、Ni元素的扩散过程,从而减小涂层厚度,并由单一NiAl相向富Al、富Ni的镍铝相转变。

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	高杉
	邹俭鹏

关键词 ：镍基高温合金, 料浆法, 渗铝涂层, 铝硅共渗, 微观结构

Abstract：Aero-engine turbine blades should be coated for protection to improve the high temperature oxidation resistance of the alloy substrate. In this study, an Al-Si coating was prepared on the surface of NiCrW-based superalloy with CaCl₂ as the activator by slurry method. X-ray diffractometer (XRD), scanning electron microscope (SEM) and energy spectrometer (EDS) were used to analyze the surface and cross-section of the coating. The results show that the aqueous solution of polyvinyl alcohol can be used as an effective binder for preparing aluminized/aluminized-silicon coatings by slurry method, and the temperature and the heating time of high-temperature diffusion significantly affect the thickness of the aluminized coating. When the composition of binder is 5%Si+30%Al (mass fraction), the coating is composed of aluminum-rich layer, NiAl layer and silicon-containing transition layer from the outside to the inside. The NiAl coating is dense and has no obvious defects, and the thickness is about 57 μm. While the compositions of binder are 10%Si+25%Al, 15%Si+20%Al and 20%Si+15%Al, the coatings are divided into three layers: Aluminum-rich layer, nickel-rich layer and silicon-containing transition layer from the outside to the inside. Silicon is mainly exist in the silicon-containing transition layer in the form of silicon-containing deposition phases, and a small amount of silicon is deposited on the outer layer. The addition of a small amount of Si can significantly affect the diffusion process of aluminum and nickel elements, and reduce the thickness of the coating, and transform the phase of the coating from a single NiAl phase to an aluminum-rich phase, nickel-rich phase.

Key words： nickel-based superalloy slurry method aluminized coating aluminum-silicon co-permeation microstructure

收稿日期: 2020-12-02 出版日期: 2021-05-07

ZTFLH:

TG174.445

基金资助:湖南省自然科学基金资助项目(2018JJ2524)

引用本文:

高杉, 邹俭鹏. 料浆法制备NiCrW基高温合金Al-Si涂层的微观结构与性能[J]. 粉末冶金材料科学与工程, 2021, 26(2): 155-165.
GAO Shan, ZOU Jianpeng. Microstructure and properties of Al-Si coating on NiCrW-based superalloy prepared by slurry method. Materials Science and Engineering of Powder Metallurgy, 2021, 26(2): 155-165.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2021/V26/I2/155

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