Nb<sub>0.74</sub>CoCrFeNi<sub>2</sub>高熵钎料钎焊陶瓷基复合材料和金属的高温连接性能

姜伟; 于康; 赵瑞晴; 代吉祥; 沙建军

Nb_0.74CoCrFeNi₂高熵钎料钎焊陶瓷基复合材料和金属的高温连接性能

姜伟¹,
于康^{2, 3},
赵瑞晴¹,
代吉祥^{1, 4, ,},
沙建军^{1, 4}

1.
大连理工大学　力学与航空航天学院, 大连 116024
2.
上海空间推进研究所, 上海 201112
3.
上海空间发动机工程技术研究中心, 上海 201112
4.
辽宁省空天飞行器前沿技术重点实验室, 大连 116024

基金项目: 上海空间推动研究所创新基金(NO：20221025)

详细信息

通讯作者:
代吉祥，博士，副教授，研究方向为复合材料结构设计与增材制造工艺　E-mail: jxdai@dlut.edu.cn

中图分类号: TB332
计量
- 文章访问数: 19
- HTML全文浏览量: 21
- 被引次数: 0
出版历程
- 收稿日期: 2024-08-06
- 修回日期: 2024-09-19
- 录用日期: 2024-10-07
- 网络出版日期: 2024-11-02

High-temperature joining properties of Nb_0.74CoCrFeNi₂ high-entropy filler for brazing ceramic matrix composites and metals

JIANG Wei¹,
YU Kang^{2, 3},
ZHAO Ruiqing¹,
DAI Jixiang^{1, 4
, ,},
SHA Jianjun^{1, 4}

1.
School of Mechanics and Aerospace Engineering, Dalian University of Technology, Dalian 116024, China
2.
Shanghai Institute of Space Propulsion, Shanghai 201112, China
3.
Shanghai Space Engine Engineering Technology Research Center, Shanghai 201112, China
4.
Liaoning Province Key Laboratory of Aerospace Vehicle Frontier Technology, Dalian 116024, China

Funds: Innovation Foundation of Shanghai Institute of Space Promotion (NO: 20221025)

摘要

摘要: 陶瓷基复合材料和金属材料在高温下的连接性能至关重要。本文采用Nb_0.74CoCrFeNi₂高熵粉末钎料对C/SiC陶瓷基复合材料与GH4169金属进行钎焊连接，揭示了钎焊接头微观组织形貌的演化过程及形成机制，探究了钎焊接头的室温、800℃和1000℃高温下的连接性能。结果显示钎焊接头典型结构为：Cr₂₃C₆+(Cr,Fe)₂₃C₆/(Cr,Fe)₃C₂+Ni₂Si+NbC/FCC+(Cr,Fe)₃C₂+Ni₂Si，C/SiC陶瓷基复合材料侧界面上随着反应的进行，Cr元素被逐渐消耗，形成了独特的梯度界面结构。随着钎焊温度升高或保温时间延长，焊缝内部缺陷逐渐消失，但脆性界面反应层厚度急剧增加，导致接头室温连接强度呈现先升高后降低的趋势，钎焊接头连接强度最高为188.1 MPa，800℃高温连接强度高达107.7 MPa，1000℃高温连接强度依然保持57.6 MPa。高连接强度源于钎料中Ni元素向C/SiC复合材料侧扩散，使纤维束丝与基体形成了较强的界面结合。
- C/SiC复合材料 /
- 高温合金 /
- 活性钎焊 /
- 高熵合金 /
- 异种接头
Abstract: Nb_0.74CoCrFeNi₂ high-entropy powder filler was used to braze C/SiC composites andGH4169, and the effects of brazing temperature and holding time on the microstructure and shear strength of the joints were systematically investigated to reveal the formation mechanism of the joints. It was found that the typical structure of joint is Cr₂₃C₆+(Cr,Fe)₂₃C₆/(Cr,Fe)₃C₂+Ni₂Si+NbC/FCC+(Cr,Fe)₃C₂+Ni₂Si. With the reaction progressing on the side interface of the composite material, the Cr element was gradually consumed, forming a unique gradient interfacial structure, which is conducive to the relief of residual stresses in the joint. With the increase of brazing temperature or the prolongation of holding time, the internal defects of the joints gradually disappeared, but the thickness of the brittle interfacial reaction layer increased sharply, resulting in the joint shear strength showing a tendency of first increasing and then decreasing. When the brazing temperature is 1260 ℃ and the holding time is 25 min, the shear strength of the brazed joint is up to 188.1 MPa, and high-temperature shear strength up to 107.7 MPa at 800℃, and still 57.6 MPa at 1000℃. The high shear strength originates from the diffusion of Ni element from the brazing material into the SiC matrix of the composite material, which forms a strong interfacial bond between the fiber bundles and the matrix.
- C/SiC composites /
- High-temperature alloys /
- Reactive brazing /
- High-entropy alloys /
- Dissimilar joints

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图 1 实验示意图：(a) 钎焊装配示意图；(b) 热循环曲线；(c) 压缩剪切测试

Figure 1. Schematic diagram of experiment: (a) Schematic diagram of assembly for brazing; (b) Thermal cycle during brazing; (c) Schematic drawing of compression shear test

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图 2 C/SiC复合材料-GH4169钎焊接头界面组织

Figure 2. BSE images of C/SiC composite-GH4169 joint

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图 3 钎焊接头XRD分析结果

Figure 3. Results of XRD analysis of brazed joints

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图 4 C/SiC陶瓷基复合材料和GH4169钎焊接头的组织演化示意图

Figure 4. Schematic diagram of microstructure evolution of C/SiC-GH4169 brazed joints

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图 5 不同钎焊工艺参数下C/SiC-GH4169接头的室温抗剪切强度

Figure 5. Room temperature shear strength of C/SiC-GH4169 joints with different brazing parameters

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图 6 不同钎焊温度下保温15 min时C/SiC-GH4169接头的微观形貌：(a,d) 1240℃；(b,e) 1260℃；(c,f) 1280℃

Figure 6. Microstructures at different brazing temperatures of C/SiC-GH4169 joints with 15 min holding time: (a,d) 1240℃; (b,e) 1260℃;(c,f) 1280℃

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图 7 1260℃不同保温时间下的C/SiC-GH4169接头微观形貌：(a,d) 15 min; (b,e) 25 min; (c,f) 35 min

Figure 7. Microstructures of C/SiC-GH4169 joints under different holding time at 1260℃: (a,d) 15 min; (b,e) 25 min; (c,f) 35 min

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图 8 不同连接温度下C/SiC-GH4169接头断口微观图：(a,d) 1240℃; (b,e) 1260℃; (c,f) 1280℃;

Figure 8. Microstructures of C/SiC-GH4169 joints fracture surfaces at different brazing temperature: (a,d) 1240℃; (b,e) 1260℃; (c,f) 1280℃

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图 9 (a) C/SiC-GH4169接头断口XRD图谱；(b)反应示意图

Figure 9. (a) XRD patterns of C/SiC-GH4169 joints fracture surfaces;(b) Reaction diagram

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图 10 C/SiC-GH4169钎焊接头的高温力学性能

Figure 10. High temperature mechanical properties of C/SiC-GH4169 brazing joints

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图 11 不同测试温度下C/SiC-GH4169接头断口微观形貌：(a,d) 室温; (b,e) 800℃; (c,f) 1000℃

Figure 11. Microstructure of C/SiC-GH4169 joints fracture surface at different testing temperature: (a,d)room temperature; (b,e) 800℃;(c,f) 1000℃

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图 12 本研究中的连接结合强度与文献对比

Figure 12. Comparison of high-temperature shear strength in this study with literatures

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表 1 图2中各点EDS分析结果

Table 1. EDS analysis results of chemical composition at each spot in Fig.2

Spot	C	Si	Cr	Fe	Ni	Co	Nb	Possible phase
A	53.97	-	41.7	2.45	0.61	1.26	-	Cr₂₃C₆
B	49.87	0.14	35.38	12.52	1.69	0.39	-	(Cr,Fe)₂₃C₆
C	47.39	9.2	17.64	6.13	17	2.61	-	Ni₂Si+(Cr,Fe)₃C₂
D	79.43	0.1	0.6	0.15	0.87	-	18.86	NbC
E	46.08	12.75	2.21	2.04	30.18	1.33	5.42	Ni₂Si
F	42.02	4.41	10.02	14.61	28.59	0.26	-	FCC
G	35.78	10.71	17.30	11.77	23.96	0.48	-	Ni₂Si+(Cr,Fe)₃C₂
H	42.31	4.08	12.73	12.35	28.42	0.11	-	FCC
I	77.88	-	0.16	0.37	0.48	-	21.1	NbC

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