Microstructure and strengthening mechanism of Si3N4/Invar joint brazed with TiNp-doped filler

Tianpeng Wang; Chunfeng Liu; Christian Leinenbach; Jie Zhang

doi:10.1016/j.msea.2015.10.038

Microstructure and strengthening mechanism of Si₃N₄/Invar joint brazed with TiN_p-doped filler

Tianpeng Wang
, Chunfeng Liu
, Christian Leinenbach
, Jie Zhang^*

^*Corresponding author for this work

Harbin Institute of Technology
Swiss Federal Laboratories for Materials Science and Technology (Empa)

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

49 Scopus citations

Abstract

Ag-Cu-Ti+TiNp composite filler was developed to braze Si₃N₄ ceramic to Invar alloy, and subsequently the effect of TiNp content on the microstructure and mechanical properties of the joints was investigated. The typical microstructure of the brazed joints is Si₃N₄/TiN+Ti₂N+TiSi+Fe₂Ti/Ag(s.s)+Cu(s.s)+TiNp/wavelike Fe₂Ti+Ni₃Ti/Ag-Cu eutectic/Invar alloy. With the increase of TiNp content, the reaction layers near the Si₃N₄ become thinner, and Ag-Cu eutectic appears less and finer between the ceramic and wavelike intermetallics. The maximum shear strength increases from 63 MPa to 229 MPa with the optimum TiNp content of 2 vol%, compared with the case without TiNp. The hardness and elastic modulus of the reaction phases were characterized by nanoindentation to reveal the strengthen of brazing seam. The following reasons are believed to strengthen the brazed joint: the thermal expansion coefficient (CTE) reduction of the composite filler, appropriate thickness of the Si₃N₄/braze reaction layer, the strengthen of the braze.

Original language	English
Pages (from-to)	469-477
Number of pages	9
Journal	Materials Science and Engineering: A
Volume	650
DOIs	https://doi.org/10.1016/j.msea.2015.10.038
State	Published - 5 Jan 2016
Externally published	Yes

Keywords

Brazing
Composite filler
Invar alloy
Nanoindentation
SiN ceramic

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10.1016/j.msea.2015.10.038

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title = "Microstructure and strengthening mechanism of Si3N4/Invar joint brazed with TiNp-doped filler",

abstract = "Ag-Cu-Ti+TiNp composite filler was developed to braze Si3N4 ceramic to Invar alloy, and subsequently the effect of TiNp content on the microstructure and mechanical properties of the joints was investigated. The typical microstructure of the brazed joints is Si3N4/TiN+Ti2N+TiSi+Fe2Ti/Ag(s.s)+Cu(s.s)+TiNp/wavelike Fe2Ti+Ni3Ti/Ag-Cu eutectic/Invar alloy. With the increase of TiNp content, the reaction layers near the Si3N4 become thinner, and Ag-Cu eutectic appears less and finer between the ceramic and wavelike intermetallics. The maximum shear strength increases from 63 MPa to 229 MPa with the optimum TiNp content of 2 vol\%, compared with the case without TiNp. The hardness and elastic modulus of the reaction phases were characterized by nanoindentation to reveal the strengthen of brazing seam. The following reasons are believed to strengthen the brazed joint: the thermal expansion coefficient (CTE) reduction of the composite filler, appropriate thickness of the Si3N4/braze reaction layer, the strengthen of the braze.",

keywords = "Brazing, Composite filler, Invar alloy, Nanoindentation, SiN ceramic",

author = "Tianpeng Wang and Chunfeng Liu and Christian Leinenbach and Jie Zhang",

note = "Publisher Copyright: {\textcopyright} 2015 Elsevier B.V.",

year = "2016",

month = jan,

day = "5",

doi = "10.1016/j.msea.2015.10.038",

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TY - JOUR

T1 - Microstructure and strengthening mechanism of Si3N4/Invar joint brazed with TiNp-doped filler

AU - Wang, Tianpeng

AU - Liu, Chunfeng

AU - Leinenbach, Christian

AU - Zhang, Jie

PY - 2016/1/5

Y1 - 2016/1/5

N2 - Ag-Cu-Ti+TiNp composite filler was developed to braze Si3N4 ceramic to Invar alloy, and subsequently the effect of TiNp content on the microstructure and mechanical properties of the joints was investigated. The typical microstructure of the brazed joints is Si3N4/TiN+Ti2N+TiSi+Fe2Ti/Ag(s.s)+Cu(s.s)+TiNp/wavelike Fe2Ti+Ni3Ti/Ag-Cu eutectic/Invar alloy. With the increase of TiNp content, the reaction layers near the Si3N4 become thinner, and Ag-Cu eutectic appears less and finer between the ceramic and wavelike intermetallics. The maximum shear strength increases from 63 MPa to 229 MPa with the optimum TiNp content of 2 vol%, compared with the case without TiNp. The hardness and elastic modulus of the reaction phases were characterized by nanoindentation to reveal the strengthen of brazing seam. The following reasons are believed to strengthen the brazed joint: the thermal expansion coefficient (CTE) reduction of the composite filler, appropriate thickness of the Si3N4/braze reaction layer, the strengthen of the braze.

AB - Ag-Cu-Ti+TiNp composite filler was developed to braze Si3N4 ceramic to Invar alloy, and subsequently the effect of TiNp content on the microstructure and mechanical properties of the joints was investigated. The typical microstructure of the brazed joints is Si3N4/TiN+Ti2N+TiSi+Fe2Ti/Ag(s.s)+Cu(s.s)+TiNp/wavelike Fe2Ti+Ni3Ti/Ag-Cu eutectic/Invar alloy. With the increase of TiNp content, the reaction layers near the Si3N4 become thinner, and Ag-Cu eutectic appears less and finer between the ceramic and wavelike intermetallics. The maximum shear strength increases from 63 MPa to 229 MPa with the optimum TiNp content of 2 vol%, compared with the case without TiNp. The hardness and elastic modulus of the reaction phases were characterized by nanoindentation to reveal the strengthen of brazing seam. The following reasons are believed to strengthen the brazed joint: the thermal expansion coefficient (CTE) reduction of the composite filler, appropriate thickness of the Si3N4/braze reaction layer, the strengthen of the braze.

KW - Brazing

KW - Composite filler

KW - Invar alloy

KW - Nanoindentation

KW - SiN ceramic

UR - https://www.scopus.com/pages/publications/84964805866

U2 - 10.1016/j.msea.2015.10.038

DO - 10.1016/j.msea.2015.10.038

M3 - 文章

AN - SCOPUS:84964805866

SN - 0921-5093

VL - 650

SP - 469

EP - 477

JO - Materials Science and Engineering: A

JF - Materials Science and Engineering: A

ER -

Microstructure and strengthening mechanism of Si₃N₄/Invar joint brazed with TiN_p-doped filler

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