University of Oulu

Gang Wang, Yunlong Yang, Rujie He, Caiwang Tan, Marko Huttula, Wei Cao, A novel high entropy CoFeCrNiCu alloy filler to braze SiC ceramics, Journal of the European Ceramic Society, Volume 40, Issue 9, 2020, Pages 3391-3398, ISSN 0955-2219, https://doi.org/10.1016/j.jeurceramsoc.2020.03.044

A novel high entropy CoFeCrNiCu alloy filler to braze SiC ceramics

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Author: Wang, Gang1; Yang, Yunlong1; He, Rujie2;
Organizations: 1Anhui Key Laboratory of High-performance Non-ferrous Metal Materials, Anhui Polytechnic University, Wuhu 241000, PR China
2Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, PR China
3State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, PR China
4Nano and Molecular Systems Research Unit, University of Oulu, P.O. Box 3000, FIN-90014, Oulu, Finland
Format: article
Version: accepted version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe2020060240195
Language: English
Published: Elsevier, 2020
Publish Date: 2022-03-25
Description:

Abstract

In order to reduce intermetallic compound formations in brazed joints, a CoFeCrNiCu high entropy alloy was invented and employed to braze SiC ceramics. Results show that SiC ceramics were tightly and strongly brazed with the CoFeCrNiCu filler. Microstructure, phase and shear strength were systematically studied for joints brazed at different temperature. Main compositions were identified as high-entropy FCC, Cu(s, s), Si(s, s), and Cr23C6 phases, regardless the brazing temperature differences. After being brazed at 1453 K, the joint reached a maximum shear strength of 60 MPa, much higher than those brazed with conventional AgCuTi filler. Thanks to high entropy effect of CoFeCrNiCu filler, random solid solution turned out in the seam and benefitted joint quality. The successful use of CoFeCrNiCu high entropy alloy as fillers can expand the application range of high entropy alloys and provide a new filler system to braze ceramics.

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Series: Journal of the European Ceramic Society
ISSN: 0955-2219
ISSN-E: 1873-619X
ISSN-L: 0955-2219
Volume: 40
Issue: 9
Pages: 3391 - 3398
DOI: 10.1016/j.jeurceramsoc.2020.03.044
OADOI: https://oadoi.org/10.1016/j.jeurceramsoc.2020.03.044
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Subjects:
Funding: This work was financially supported by the National Natural Science Foundation of China [51704001, 51772028, 51772028]; Talent Project of Anhui Province [Z175050020001]; Natural Science Foundation of Anhui Province [KJ2018A0860], Talent Project of Anhui Polytechnic University, Anhui Provincial Grant for high-level platform construction, and the Academy of Finland [No. 311934], and the Opening Project of State Key Laboratory of High Performance Ceramics and Superfine Microstructure [No. SKL201902SIC].
Copyright information: © 2020 Elsevier. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/.
  https://creativecommons.org/licenses/by-nc-nd/4.0/