Brazing ZrB2-SiC ceramics to Nb with a novel CoFeNiCrCu high entropy alloy

Gang Wang; Yunlong Yang; Miao Wang; Rujie He; Caiwang Tan; Wei Cao; Hai Feng Xu

doi:10.1016/j.jeurceramsoc.2020.08.050

Brazing ZrB₂-SiC ceramics to Nb with a novel CoFeNiCrCu high entropy alloy

Gang Wang, Yunlong Yang, Miao Wang, Rujie He^*, Caiwang Tan, Wei Cao, Hai Feng Xu

^*Corresponding author for this work

Institute of Advanced Structure Technology

Research output: Contribution to journal › Article › peer-review

58 Citations (Scopus)

Abstract

ZrB₂-SiC ceramic and Nb were brazed by using a novel high entropy alloy CoFeNiCrCu filler. Interfacial microstructure, mechanical properties and brazing mechanism of the joint were systematically investigated. It was found that the activity of Cr could be maintained during the brazing process due to the high-entropy mixing effect of CoFeNiCrCu. The newly generated Cr₂B had a tooth shape and it improved interfacial bonding between ZrB₂-SiC and Nb. A composite microstructure containing a soft FCC and hard Laves phase was formed in the joint due to the presence of Nb and this microstructure significantly enhanced the joint strength. Influences of brazing temperature on the interfacial reaction and shear strength of joint were also investigated. After being brazed at 1160 °C for 60 min, the maximum shear strengths of the joint were 216 and 94 MPa at room temperature and at 650 °C, respectively, indicating the successful use of the filler.

Original language	English
Pages (from-to)	54-61
Number of pages	8
Journal	Journal of the European Ceramic Society
Volume	41
Issue number	1
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2020.08.050
Publication status	Published - Jan 2021

Keywords

Brazing
High entropy alloy
Microstructure
Shear strength
ZrB-SiC ceramic

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10.1016/j.jeurceramsoc.2020.08.050

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title = "Brazing ZrB2-SiC ceramics to Nb with a novel CoFeNiCrCu high entropy alloy",

abstract = "ZrB2-SiC ceramic and Nb were brazed by using a novel high entropy alloy CoFeNiCrCu filler. Interfacial microstructure, mechanical properties and brazing mechanism of the joint were systematically investigated. It was found that the activity of Cr could be maintained during the brazing process due to the high-entropy mixing effect of CoFeNiCrCu. The newly generated Cr2B had a tooth shape and it improved interfacial bonding between ZrB2-SiC and Nb. A composite microstructure containing a soft FCC and hard Laves phase was formed in the joint due to the presence of Nb and this microstructure significantly enhanced the joint strength. Influences of brazing temperature on the interfacial reaction and shear strength of joint were also investigated. After being brazed at 1160 °C for 60 min, the maximum shear strengths of the joint were 216 and 94 MPa at room temperature and at 650 °C, respectively, indicating the successful use of the filler.",

keywords = "Brazing, High entropy alloy, Microstructure, Shear strength, ZrB-SiC ceramic",

author = "Gang Wang and Yunlong Yang and Miao Wang and Rujie He and Caiwang Tan and Wei Cao and Xu, {Hai Feng}",

note = "Publisher Copyright: {\textcopyright} 2020 Elsevier Ltd",

year = "2021",

month = jan,

doi = "10.1016/j.jeurceramsoc.2020.08.050",

language = "English",

volume = "41",

pages = "54--61",

journal = "Journal of the European Ceramic Society",

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TY - JOUR

T1 - Brazing ZrB2-SiC ceramics to Nb with a novel CoFeNiCrCu high entropy alloy

AU - Wang, Gang

AU - Yang, Yunlong

AU - Wang, Miao

AU - He, Rujie

AU - Tan, Caiwang

AU - Cao, Wei

AU - Xu, Hai Feng

PY - 2021/1

Y1 - 2021/1

N2 - ZrB2-SiC ceramic and Nb were brazed by using a novel high entropy alloy CoFeNiCrCu filler. Interfacial microstructure, mechanical properties and brazing mechanism of the joint were systematically investigated. It was found that the activity of Cr could be maintained during the brazing process due to the high-entropy mixing effect of CoFeNiCrCu. The newly generated Cr2B had a tooth shape and it improved interfacial bonding between ZrB2-SiC and Nb. A composite microstructure containing a soft FCC and hard Laves phase was formed in the joint due to the presence of Nb and this microstructure significantly enhanced the joint strength. Influences of brazing temperature on the interfacial reaction and shear strength of joint were also investigated. After being brazed at 1160 °C for 60 min, the maximum shear strengths of the joint were 216 and 94 MPa at room temperature and at 650 °C, respectively, indicating the successful use of the filler.

AB - ZrB2-SiC ceramic and Nb were brazed by using a novel high entropy alloy CoFeNiCrCu filler. Interfacial microstructure, mechanical properties and brazing mechanism of the joint were systematically investigated. It was found that the activity of Cr could be maintained during the brazing process due to the high-entropy mixing effect of CoFeNiCrCu. The newly generated Cr2B had a tooth shape and it improved interfacial bonding between ZrB2-SiC and Nb. A composite microstructure containing a soft FCC and hard Laves phase was formed in the joint due to the presence of Nb and this microstructure significantly enhanced the joint strength. Influences of brazing temperature on the interfacial reaction and shear strength of joint were also investigated. After being brazed at 1160 °C for 60 min, the maximum shear strengths of the joint were 216 and 94 MPa at room temperature and at 650 °C, respectively, indicating the successful use of the filler.

KW - Brazing

KW - High entropy alloy

KW - Microstructure

KW - Shear strength

KW - ZrB-SiC ceramic

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U2 - 10.1016/j.jeurceramsoc.2020.08.050

DO - 10.1016/j.jeurceramsoc.2020.08.050

M3 - Article

AN - SCOPUS:85089969526

SN - 0955-2219

VL - 41

SP - 54

EP - 61

JO - Journal of the European Ceramic Society

JF - Journal of the European Ceramic Society

IS - 1

ER -

Brazing ZrB₂-SiC ceramics to Nb with a novel CoFeNiCrCu high entropy alloy

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Keywords

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