GH738合金表面Al-Si渗层的制备及其抗氧化行为

doi:10.13251/j.issn.0254-6051.2023.03.031

金属热处理 ›› 2023, Vol. 48 ›› Issue (3): 188-194.DOI: 10.13251/j.issn.0254-6051.2023.03.031

GH738合金表面Al-Si渗层的制备及其抗氧化行为

郭孟鑫, 冉雪林, 张进

西南石油大学新能源与材料学院, 四川成都 610500

收稿日期:2022-11-01 修回日期:2023-02-10 出版日期:2023-03-25 发布日期:2023-04-25
通讯作者: 张进,教授,博士,E-mail:jzhang@swpu.edu.cn。
作者简介:郭孟鑫(1996—),男,硕士研究生,主要研究方向为粉末渗层制备技术,E-mail:330021627@qq.com。
基金资助:
长寿命高温材料国家重点试验室开放课题(DTCC28EE200794)。

Preparation and oxidation resistance of Al-Si coating on GH738 alloy

Guo Mengxin, Ran Xuelin, Zhang Jin

School of New Energy and Materials, Southwest Petroleum University, Chengdu Sichuan 610500, China

Received:2022-11-01 Revised:2023-02-10 Online:2023-03-25 Published:2023-04-25

摘要/Abstract

摘要： 采用热扩散法在GH738合金表面制备出Al-Si渗层。通过X射线衍射仪(XRD),扫描电镜(SEM),能谱仪(EDS)分析了Al-Si渗层形貌、厚度、物相组成和元素分布;采用显微维氏硬度计测定了渗层的硬度;采用静态增量试验方法,在1200 ℃,对Al-Si渗层试样和GH738镍基合金基体进行了100 h的恒温抗氧化性能测试。结果表明,Al-Si渗层厚度可达120 μm,渗层为明显的双层结构,外层为Al-Si层,内层为互扩散层;渗层物相组成主要为NiAl和Ni₂Al₃以及少量Cr₃Si;渗层表面硬度达到900 HV0.1左右,约为基体的3.5倍;Al-Si渗层氧化动力学曲线满足抛物线规律,氧化速率常数为0.0987 mg²·cm^-4·h^-1,表面形成比较致密的Al₂O₃保护膜,其高温抗氧化性能较基体提高了约5倍。

关键词: GH738合金, 热扩散法, Al-Si渗层, 高温抗氧化性

Abstract: Al-Si coating was prepared on the surface of GH738 alloy by thermal diffusion method. The morphology, thickness, phase composition and element distribution of the Al-Si coating were studied by means of X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS); the hardness of the coating was determined by hardness tester; the static high temperature oxidation resistance test was carried out at 1200 ℃ for 100 h. The results show that the coating thickness reaches 120 μm, the coating is an obvious double-layer structure, the outer layer is Al-Si layer, and the inner layer is inter-diffusion layer; the phase composition of the coating is mainly NiAl and Ni₂Al₃ with a small amount of Cr₃Si; the hardness of the coating reaches about 900 HV0.1, which is about 3.5 times of the matrix; the oxidation kinetics curve of the coating meets the parabolic law, and the oxidation rate constant is 0.0987 mg²·cm^-4·h^-1. The high temperature oxidation resistance of the relatively dense Al₂O₃ protective film formed on the alloy surface is about 5 times higher than that of the matrix.

Key words: GH738 alloy, thermal diffusion method, Al-Si coating, high temperature oxidation resistance

中图分类号:

TB31

郭孟鑫, 冉雪林, 张进. GH738合金表面Al-Si渗层的制备及其抗氧化行为[J]. 金属热处理, 2023, 48(3): 188-194.

Guo Mengxin, Ran Xuelin, Zhang Jin. Preparation and oxidation resistance of Al-Si coating on GH738 alloy[J]. Heat Treatment of Metals, 2023, 48(3): 188-194.

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GH738合金表面Al-Si渗层的制备及其抗氧化行为

Preparation and oxidation resistance of Al-Si coating on GH738 alloy

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