Effect of brazing time on microstructure and properties of SiC ceramic brazed with CoFeNiCrCu

WANG Miao; WANG Wei; YANG Yunlong; TAN Caiwang; WANG Gang

doi:10.7527/S1000-6893.2021.25057

ACTA AERONAUTICAET ASTRONAUTICA SINICA >

2022 , Vol. 43 >Issue 4: 525057 - 525057

DOI: https://doi.org/10.7527/S1000-6893.2021.25057

Articles

Effect of brazing time on microstructure and properties of SiC ceramic brazed with CoFeNiCrCu

WANG Miao ,
WANG Wei ,
YANG Yunlong ,
TAN Caiwang ,
WANG Gang

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1. School of Materials Science and Engineering, Anhui Polytechnic University, Wuhu 241000, China;
2. School of Aviation and Materials, Anhui Machine and Electricity College, Wuhu 241002, China;
3. School of Materials Science and Engineering, Harbin Institute of Technology, Weihai 264209, China

Received date: 2020-12-04

Revised date: 2020-12-21

Online published: 2021-04-27

Supported by

Natural Science Foundation of Anhui Province(2008085J23);National Natural Science Foundation of China (51704001,52171148);Talent and Top-notch Project of Anhui Province(gxyqZD2020059);Talent Project of Anhui Province (Z175050020001); Scientific Research Starting Foundation of Anhui Polytechnic University of China(2020YQQ036); China Postdoctoral Science Foundation(2021M690180)

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Abstract

The SiC ceramic was brazed by CoFeNiCrCu filler, and the effect of brazing time on the microstructure and mechanical properties of the joint was investigated. The results show that the typical interface structure of the joint is SiC/Cr₂₃C₆+Cu(s, s)+Si(s, s)/HEAF+Cu(s, s)/Cr₂₃C₆+Cu(s, s)+Si(s, s)/SiC. With the increase of brazing time, no change of types of phases occurred in the structure; the joint was still mainly composed of solid solution due to the high entropy effect, but the thickness of the reaction layer in the joint gradually increased. When the brazing time was 90 min, the thickness of the reaction layer reached a maximum of 25 μm. However, the stress generated during the cooling process of the over thick reaction layer joint was concentrated in the reaction layer and caused defects such as cracks in the reaction layer. When the welding temperature was 1 180℃ and the holding time was 60 min, the maximum joint shear strength reached 61 MPa. At this time, cracks started from the SiC ceramic of the extended joint, and then expanded in the direction of the joint, and finally ruptured at the interface between the ceramic and the reaction layer.

Key words： SiC ceramic; high-entropy filler; brazing; interfacial microstructure; mechanical property

Cite this article

WANG Miao , WANG Wei , YANG Yunlong , TAN Caiwang , WANG Gang . Effect of brazing time on microstructure and properties of SiC ceramic brazed with CoFeNiCrCu[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022 , 43(4) : 525057 -525057 . DOI: 10.7527/S1000-6893.2021.25057

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