Al-Ti合金钎焊SiC陶瓷接头界面微观结构与力学性能

doi:10.15541/jim20210652

无机材料学报 ›› 2022, Vol. 37 ›› Issue (6): 683-690.DOI: 10.15541/jim20210652 CSTR: 32189.14.10.15541/jim20210652

Al-Ti合金钎焊SiC陶瓷接头界面微观结构与力学性能

徐谱昊(), 张相召, 刘桂武(), 张明芬, 桂新易, 乔冠军()

江苏大学材料科学与工程学院, 镇江 212013

收稿日期:2021-10-22 修回日期:2022-01-19 出版日期:2022-06-20 网络出版日期:2022-01-24
通讯作者: 刘桂武, 教授. E-mail: gwliu76@ujs.edu.cn;
乔冠军, 教授. E-mail: gjqiao@ujs.edu.cn.
作者简介:徐谱昊(1993-), 男, 博士研究生. E-mail: 13667004282@163.com

Microstructure and Mechanical Properties of SiC Joint Brazed by Al-Ti Alloys as Filler Metal

XU Puhao(), ZHANG Xiangzhao, LIU Guiwu(), ZHANG Mingfen, GUI Xinyi, QIAO Guanjun()

School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China

Received:2021-10-22 Revised:2022-01-19 Published:2022-06-20 Online:2022-01-24
Contact: LIU Guiwu, professor. E-mail: gwliu76@ujs.edu.cn;
QIAO Guanjun, professor. E-mail: gjqiao@ujs.edu.cn
About author:XU Puhao (1993–), male, PhD candidate. E-mail: 13667004282@163.com
Supported by:
National Natural Science Foundation of China(52002153);National Natural Science Foundation of China(51572112);Natural Science Foundation of the Jiangsu Higher Education

摘要/Abstract

摘要：

SiC陶瓷具有优异的综合性能, 通过钎焊获得高强度接头是其获得广泛应用的重要前提。研究采用Al-(10, 20, 30, 40)Ti(Ti的名义原子含量10%、20%、30%、40%)系列合金, 在1550 ℃条件下, 对SiC陶瓷进行钎焊30 min。当中间层厚度为~50 μm时, SiC钎焊接头的平均剪切强度处于100~260 MPa范围内。当采用Al-20Ti合金作为钎料时, 随着中间层厚度从~100 μm减小至25 μm, 钎焊接头的平均强度逐渐提高, 且最大强度~315 MPa。同时, 钎焊中间层中(Al)相逐渐减少直至消失, 只留下Al₄C₃、TiC和(Al,Si)₃Ti相。SiC/Al-20Ti/SiC钎焊接头的断裂主要发生在靠近中间层/陶瓷界面位置的陶瓷基体内。

关键词: SiC, 钎焊, 界面, 微结构, 力学性能

Abstract:

SiC ceramic has excellent overall properties, and joining it to other materials with high joint strength is an important issue in the actual applications. Brazing of SiC ceramic to itself was performed using the as-fabricated Al-(10, 20, 30, 40)Ti alloys with nominal Ti concentrations of 10%, 20%, 30%, and 40% at 1550 ℃ × 30 min. The average joint shear strength fluctuates in the range of ~100‒260 MPa with the interlayer thickness of ~50 μm. Moreover, the average strength SiC/Al-20Ti/SiC joint is increased markedly with the interlayer thickness decreasing from ~100 to 25 μm, reaching the maximum of ~315 MPa. Meanwhile, the (Al) phase in the interlayers is reduced gradually till disappear with the thinnest brazing interlayer, leaving the Al₄C₃, TiC and (Al,Si)₃Ti phases in the interlayer. The joint fractures of SiC/Al-20Ti/SiC joint mainly occur in the SiC ceramic substrate near the interlayer/ceramic interface.

Key words: SiC, brazing, interfaces, microstructures, mechanical property

中图分类号:

TG456

徐谱昊, 张相召, 刘桂武, 张明芬, 桂新易, 乔冠军. Al-Ti合金钎焊SiC陶瓷接头界面微观结构与力学性能[J]. 无机材料学报, 2022, 37(6): 683-690.

XU Puhao, ZHANG Xiangzhao, LIU Guiwu, ZHANG Mingfen, GUI Xinyi, QIAO Guanjun. Microstructure and Mechanical Properties of SiC Joint Brazed by Al-Ti Alloys as Filler Metal[J]. Journal of Inorganic Materials, 2022, 37(6): 683-690.

图/表 14

Fig. S1 Schematic of the shear test fixture

Fig. 1 BSE images of four nominal Al-Ti alloys (a) Al-10Ti; (b) Al-20Ti; (c) Al-30Ti; (d) Al-40Ti. The black dots are the diamond particles introduced during the polishing

Fig. 2 XRD patterns of the Al-Ti alloys

Fig. S2 Typical BSE images of Al-(10, 20, 30, 40)Ti alloys and the corresponding elemental mapping

Fig. S3 Typical BSE image of Al-40Ti alloy and the corresponding elemental compositions of the selected area

Fig. 3 Cross-sectional BSE images of SiC/SiC joints brazed using the four nominal Al-Ti alloys (a-h) and corresponding EDS elemental mapping (i) (a, b) Al-10Ti; (c, d) Al-20Ti; (e, f) Al-30Ti; (g, h) Al-40Ti

Table 1 EDS results of partial phases in joint interlayers (atom percent)

Data from	Elemental composition /%				Possible phases
Data from	Ti	Al	C	Si	Possible phases
Fig. 3(b)	0.87	98.04	‒	1.09	(Al)
	55.33	‒	45.67	‒	TiC
	25.85	62.83	‒	11.32	(Al,Si)₃Ti
Fig. 3(d)	‒	98.91	‒	1.09	(Al)
	53.98	0.06	45.11	0.84	TiC
	26.27	59.23	2.47	12.03	(Al,Si)₃Ti
Fig. 3(f)	48.61	1.85	31.39	18.15	Ti₃Si(Al)C₂
Fig. 3(h)	50.29	1.26	30.42	18.03	Ti₃Si(Al)C₂

Fig. S4 Cross-sectional BSE image of the SiC/Al-30Ti/SiC joint brazed at 1550 ℃ × 30 min and the corresponding elemental mappings

Fig. 4 Cross-sectional BSE images of SiC/Al-20Ti/SiC joints brazed with interlayers of different thickness (a) ~25 μm; (b) 50 μm; (c) 70 μm; (d) 100 μm

Fig. 5 Interfacial (a) TEM and (b?f) HRTEM images of SiC/Al-20Ti/SiC joint sample with interlayer thickness of ~25 μm and the corresponding (g?i) SAED patterns

Fig. S5 Interfacial TEM image of SiC/Al-20Ti/SiC joint sample and the corresponding elemental mappings

Fig. 6 Variations of joint shear strength with (a) Ti concentration of Al-Ti alloys and (b) interlayer thickness of Al-20Ti alloy

Fig. 7 Typical fracture surface morphologies of SiC/SiC joints brazed using different nominal Al-Ti alloys (a, b) Al-10Ti; (c, d) Al-20Ti; (e, f) Al-30Ti ; (g, h) Al-40Ti

Fig. 8 XRD patterns of fracture surfaces of SiC/SiC joints brazed using various nominal Al-Ti alloys

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Al-Ti合金钎焊SiC陶瓷接头界面微观结构与力学性能

Microstructure and Mechanical Properties of SiC Joint Brazed by Al-Ti Alloys as Filler Metal

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