SiC/SiC-哈氏合金异质连接机制及其氟熔盐腐蚀特性分析

doi:10.15541/jim20210381

无机材料学报 ›› 2022, Vol. 37 ›› Issue (4): 452-458.DOI: 10.15541/jim20210381

所属专题：【结构材料】陶瓷基复合材料

SiC/SiC-哈氏合金异质连接机制及其氟熔盐腐蚀特性分析

王洪达¹^,²(), 冯倩³, 游潇¹^,²^,⁴, 周海军¹^,²(), 胡建宝¹^,², 阚艳梅¹^,², 陈小武¹^,², 董绍明¹^,²

1.中国科学院上海硅酸盐研究所, 高性能陶瓷和超微结构国家重点实验室, 上海 200050
2.中国科学院上海硅酸盐研究所, 结构陶瓷与复合材料工程研究中心, 上海 200050
3.东华大学分析测试中心, 上海 201600
4.中国科学院大学, 北京 100039

收稿日期:2021-06-18 修回日期:2021-07-14 出版日期:2022-04-20 网络出版日期:2021-08-20
通讯作者: 周海军, 副研究员. E-mail: zhouhj00000@mail.sic.ac.cn
作者简介:王洪达(1989–), 男, 副研究员. E-mail: wanghd@mail.sic.ac.cn

Microstructure and Corrosion Behavior of Brazed Joints of SiC/SiC Composites and Hastelloy N Alloy Using Cu-Ni Alloy

WANG Hongda¹^,²(), FENG Qian³, YOU Xiao¹^,²^,⁴, ZHOU Haijun¹^,²(), HU Jianbao¹^,², KAN Yanmei¹^,², CHEN Xiaowu¹^,², DONG Shaoming¹^,²

1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
2. Structural Ceramics and Composites Engineering Research Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
3. Analysis and Testing center, Donghua University, Shanghai 201600, China
4. University of Chinese Academy of Sciences, Beijing 100039, China

Received:2021-06-18 Revised:2021-07-14 Published:2022-04-20 Online:2021-08-20
Contact: ZHOU Haijun, associate professor. E-mail: zhouhj00000@mail.sic.ac.cn
About author:WANG Hongda (1989–), male, associate professor. E-mail: wanghd@mail.sic.ac.cn
Supported by:
National Natural Science Foundation of China(51802329)

摘要/Abstract

摘要：

以Cu-2.67Ni钎料, 采用钎焊工艺获得了SiC/SiC复合材料-哈氏合金异质接头, 并研究了其在800 ℃的FLiNaK熔盐中的腐蚀行为。利用不同手段表征了接头微观结构和氟熔盐腐蚀行为。结果表明, Ni、Cr、Mo等合金元素以及SiC中的Si元素发生互扩散。Cr元素替代Ni元素, 在焊料-复合材料界面富集并形成不连续碳化物层。高温钎焊加速Ni扩散并侵蚀SiC, 低温钎焊导致焊料熔融不充分。钎焊过程中的元素扩散改变了哈氏合金的组成,导致其耐腐蚀性能恶化。Cr与Si的选择性溶出导致钎焊接头及合金的腐蚀损伤, 这与热力学计算结果一致。

关键词: SiC/SiC复合材料, 哈氏 N合金, Cu-Ni合金, 钎焊接头, 腐蚀行为

Abstract:

SiC fibers reinforced SiC ceramic matrix composites were brazed to Hastelloy N alloy using Cu-2.67Ni (mass percentage) alloy. The obtained joints were corroded in FLiNaK molten salt at 800 ℃for 100 h. Microstructure evolution and corrosion behavior of joints were characterized. Alloy elements, e.g. Ni, Cr and Mo, diffuse from Hastelloy N alloy into Cu-Ni joint seam, while the Si element in SiC/SiC composites diffuses into joint seam even the Hastelloy N alloy. Cr element enriches near the interface between SiC composites and joint alloy to form discontinuity interlayer, which acts as the active metal instead of Ni. Higher temperature contributes to both the diffusion process and the erosion of SiC by Ni, and lower temperature would lead to the incomplete fusion of brazing fillers. The diffusion of elements during the brazing changes the composition of the joint seam and Hastelloy N alloy, which caused the deterioration of corrosion resistance of alloy. The selective corrosion of Cr and Si, supported by thermodynamic calculation, results in the corrosion of both joint seam and alloy.

Key words: SiC/SiC composites, Hastelloy N alloy, Cu-Ni alloy, brazing joint, corrosion behavior

中图分类号:

TQ174

王洪达, 冯倩, 游潇, 周海军, 胡建宝, 阚艳梅, 陈小武, 董绍明. SiC/SiC-哈氏合金异质连接机制及其氟熔盐腐蚀特性分析[J]. 无机材料学报, 2022, 37(4): 452-458.

WANG Hongda, FENG Qian, YOU Xiao, ZHOU Haijun, HU Jianbao, KAN Yanmei, CHEN Xiaowu, DONG Shaoming. Microstructure and Corrosion Behavior of Brazed Joints of SiC/SiC Composites and Hastelloy N Alloy Using Cu-Ni Alloy[J]. Journal of Inorganic Materials, 2022, 37(4): 452-458.

图/表 9

Fig. 1 Schematic illustration of the sandwich-like structure of joint

Fig. 2 SEM images of brazing joints obtained at (a) 1090, (b) 1110 ℃, (c) and (d) 1130 ℃, correspoding EDS analyses (atom fraction) (e) of the point in image (d)

Fig. 3 Elemental distribution analyses by EDS of joint obtained at 1130 ℃

Fig. 4 Gibbs free energy of formation of candidates calculated using HSC Chemistry 5.11 computer software and its associated databases

Fig. 5 SEM image of microstructure and EDS line-scan analyses in SiC/SiC composites near joint obtained at 1150 ℃

Fig. 6 XRD patterns of joints before and after corrosion

Fig. 7 Appearance images and SEM images of microstructure of joints before and after corrosion at 800 ℃ for 100 h

Fig. 8 Elemental distribution analyses by EDS of joint obtained at 1130 ℃ after corrosion at 800 ℃ for 100 h

Table 1 Content of main metal impurities in fluoride salts before and after corrosion (10-4% in mass)

Element	Before corrosion	After corrosion
Ni	10	20
Cr	20	210
Fe	30	40
Mo	<10	<10

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SiC/SiC-哈氏合金异质连接机制及其氟熔盐腐蚀特性分析

Microstructure and Corrosion Behavior of Brazed Joints of SiC/SiC Composites and Hastelloy N Alloy Using Cu-Ni Alloy

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