Control of residual stresses in 2Si-B-3C-N and Nb joints by the Ag-Cu-Ti + Mo composite interlayer

Rui Pan; Sasa Kovacevic; Tiesong Lin; Peng He; Dusan P. Sekulic; Sinisa Dj Mesarovic; Zhihua Yang; Yanxu Shen; Hongmei Wei

doi:10.1016/j.matdes.2016.03.072

Control of residual stresses in 2Si-B-3C-N and Nb joints by the Ag-Cu-Ti + Mo composite interlayer

Rui Pan, Sasa Kovacevic, Tiesong Lin, Peng He, Dusan P. Sekulic, Sinisa Dj Mesarovic, Zhihua Yang, Yanxu Shen, Hongmei Wei

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

37 Scopus citations

Abstract

2Si-B-3C-N ceramic was successfully vacuum brazed to Nb. Brazing was executed at 850 °C for 10 min using Ag-Cu-Ti/Mo/Ag-Cu-Ti composite interlayer. Effects of the Mo interlayer thickness within the composite interlayer on the microstructure of the joint and its shear strength were investigated. In joints brazed without Mo and with 50 μm Mo interlayer a continuous through cracks propagated within the ceramic during cooling. However, no cracks were found in joints when Mo interlayers thicker than 100 μm were used. The improvement of the shear strength with an increase in the thickness of Mo interlayer within the composite interlayer was achieved. To explain the effects of the Mo layer thickness, detailed FEM simulations of the cooling process were performed. The analysis of the residual stress is consistent with the observed joint strengthening and crack propagation.

Original language	English
Pages (from-to)	193-200
Number of pages	8
Journal	Materials and Design
Volume	99
DOIs	https://doi.org/10.1016/j.matdes.2016.03.072
State	Published - Jun 5 2016

Bibliographical note

Publisher Copyright:
© 2016 Elsevier Ltd.

Funding

The authors gratefully acknowledge the financial support from “ National Natural Science Foundation of China (NSFC, grant numbers 51305102 and 51475103 and 51321061 )” and “ The Funds for Distinguished Young Scientists of Heilongjiang Province (grant number JC2015011 )”. One of the authors (DPS) acknowledges a support through the 1000 Foreign Expert Distinguished Professor Plan. The lead author (RP) acknowledges the support from the Chinese Scholarship Council for visiting positions at the MIT and the University of Kentucky. The work of USA team members has been funded in part by the US National Science Foundation through the grants US NSF Grant CBET # 1234581 and US NSF Grant CBET # 1235759 .

Funders	Funder number
Funds for Distinguished Young Scientists of Heilongjiang Province	JC2015011
National Science Foundation (NSF)	CBET # 1235759, CBET # 1234581
University of Kentucky
National Natural Science Foundation of China (NSFC)	51305102, 51475103, 51321061

Keywords

Brazing
Composite interlayer
Mo
Residual stress
Si-B-C-N ceramic

ASJC Scopus subject areas

General Materials Science
Mechanics of Materials
Mechanical Engineering

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title = "Control of residual stresses in 2Si-B-3C-N and Nb joints by the Ag-Cu-Ti + Mo composite interlayer",

abstract = "2Si-B-3C-N ceramic was successfully vacuum brazed to Nb. Brazing was executed at 850 °C for 10 min using Ag-Cu-Ti/Mo/Ag-Cu-Ti composite interlayer. Effects of the Mo interlayer thickness within the composite interlayer on the microstructure of the joint and its shear strength were investigated. In joints brazed without Mo and with 50 μm Mo interlayer a continuous through cracks propagated within the ceramic during cooling. However, no cracks were found in joints when Mo interlayers thicker than 100 μm were used. The improvement of the shear strength with an increase in the thickness of Mo interlayer within the composite interlayer was achieved. To explain the effects of the Mo layer thickness, detailed FEM simulations of the cooling process were performed. The analysis of the residual stress is consistent with the observed joint strengthening and crack propagation.",

keywords = "Brazing, Composite interlayer, Mo, Residual stress, Si-B-C-N ceramic",

author = "Rui Pan and Sasa Kovacevic and Tiesong Lin and Peng He and Sekulic, {Dusan P.} and Mesarovic, {Sinisa Dj} and Zhihua Yang and Yanxu Shen and Hongmei Wei",

note = "Publisher Copyright: {\textcopyright} 2016 Elsevier Ltd.",

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day = "5",

doi = "10.1016/j.matdes.2016.03.072",

language = "English",

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AU - Pan, Rui

AU - Kovacevic, Sasa

AU - Lin, Tiesong

AU - He, Peng

AU - Sekulic, Dusan P.

AU - Mesarovic, Sinisa Dj

AU - Yang, Zhihua

AU - Shen, Yanxu

AU - Wei, Hongmei

PY - 2016/6/5

Y1 - 2016/6/5

N2 - 2Si-B-3C-N ceramic was successfully vacuum brazed to Nb. Brazing was executed at 850 °C for 10 min using Ag-Cu-Ti/Mo/Ag-Cu-Ti composite interlayer. Effects of the Mo interlayer thickness within the composite interlayer on the microstructure of the joint and its shear strength were investigated. In joints brazed without Mo and with 50 μm Mo interlayer a continuous through cracks propagated within the ceramic during cooling. However, no cracks were found in joints when Mo interlayers thicker than 100 μm were used. The improvement of the shear strength with an increase in the thickness of Mo interlayer within the composite interlayer was achieved. To explain the effects of the Mo layer thickness, detailed FEM simulations of the cooling process were performed. The analysis of the residual stress is consistent with the observed joint strengthening and crack propagation.

AB - 2Si-B-3C-N ceramic was successfully vacuum brazed to Nb. Brazing was executed at 850 °C for 10 min using Ag-Cu-Ti/Mo/Ag-Cu-Ti composite interlayer. Effects of the Mo interlayer thickness within the composite interlayer on the microstructure of the joint and its shear strength were investigated. In joints brazed without Mo and with 50 μm Mo interlayer a continuous through cracks propagated within the ceramic during cooling. However, no cracks were found in joints when Mo interlayers thicker than 100 μm were used. The improvement of the shear strength with an increase in the thickness of Mo interlayer within the composite interlayer was achieved. To explain the effects of the Mo layer thickness, detailed FEM simulations of the cooling process were performed. The analysis of the residual stress is consistent with the observed joint strengthening and crack propagation.

KW - Brazing

KW - Composite interlayer

KW - Mo

KW - Residual stress

KW - Si-B-C-N ceramic

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JO - Materials and Design

JF - Materials and Design

ER -

Control of residual stresses in 2Si-B-3C-N and Nb joints by the Ag-Cu-Ti + Mo composite interlayer

Abstract

Bibliographical note

Funding

Keywords

ASJC Scopus subject areas

Access to Document

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