Microstructural and mechanical properties of porous Si3N4 carbon coated ceramic brazed with a cobalt-silicon filler

Y. L. Zhuang; T. S. Lin; S. J. Wang; P. He; D. P. Sekulic; D. C. Jia

doi:10.1016/j.jeurceramsoc.2017.03.031

Microstructural and mechanical properties of porous Si₃N₄ carbon coated ceramic brazed with a cobalt-silicon filler

Y. L. Zhuang, T. S. Lin, S. J. Wang, P. He, D. P. Sekulic, D. C. Jia

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

14 Scopus citations

Abstract

The Co_22.5Si_77.5 (at.%) braze was used to bond porous Si₃N₄ ceramics. The effects of brazing temperature on microstructure and the bonding strength of the joint were studied. The results reveal that no visible reaction layer was observed. The corresponding joint strength was low. In order to improve the joint strength a carbon coated modification of the porous Si₃N₄ substrate was suggested. The impact of this modification on the joint properties was examined. It was established that a SiC reaction layer with a thickness from ∼15 μm to ∼65 μm was formed at the interface and SiC nanowires were observed when the temperature increased from 1280 °C to 1340 °C. The maximum shear strength of the carbon coated and uncoated joints were 115 MPa and 44 MPa, respectively. The significant improvement of the joint strength was attributed to the SiC reaction layer and a strengthening by the presence of SiC nanowires.

Original language	English
Pages (from-to)	3293-3301
Number of pages	9
Journal	Journal of the European Ceramic Society
Volume	37
Issue number	10
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2017.03.031
State	Published - Aug 2017

Bibliographical note

Publisher Copyright:
© 2017 Elsevier Ltd

Funding

This research was supported by National Natural Science Foundation of China. (NSFC, 51402068, 51475103). The work of one of the authors (DPS) has been supported through the Distinguished Foreign Expert 1000 Plan professorship at the Harbin Institute of Technology.

Funders	Funder number
Distinguished Foreign Expert 1000 Plan
National Natural Science Foundation of China (NSFC)	51475103, 51402068
Harbin Institute of Technology

Keywords

Brazing
Co-Si filler
Porous SiN
SiC nanowires

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

Access to Document

10.1016/j.jeurceramsoc.2017.03.031

Cite this

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title = "Microstructural and mechanical properties of porous Si3N4 carbon coated ceramic brazed with a cobalt-silicon filler",

abstract = "The Co22.5Si77.5 (at.%) braze was used to bond porous Si3N4 ceramics. The effects of brazing temperature on microstructure and the bonding strength of the joint were studied. The results reveal that no visible reaction layer was observed. The corresponding joint strength was low. In order to improve the joint strength a carbon coated modification of the porous Si3N4 substrate was suggested. The impact of this modification on the joint properties was examined. It was established that a SiC reaction layer with a thickness from ∼15 μm to ∼65 μm was formed at the interface and SiC nanowires were observed when the temperature increased from 1280 °C to 1340 °C. The maximum shear strength of the carbon coated and uncoated joints were 115 MPa and 44 MPa, respectively. The significant improvement of the joint strength was attributed to the SiC reaction layer and a strengthening by the presence of SiC nanowires.",

keywords = "Brazing, Co-Si filler, Porous SiN, SiC nanowires",

author = "Zhuang, {Y. L.} and Lin, {T. S.} and Wang, {S. J.} and P. He and Sekulic, {D. P.} and Jia, {D. C.}",

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year = "2017",

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doi = "10.1016/j.jeurceramsoc.2017.03.031",

language = "English",

volume = "37",

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T1 - Microstructural and mechanical properties of porous Si3N4 carbon coated ceramic brazed with a cobalt-silicon filler

AU - Zhuang, Y. L.

AU - Lin, T. S.

AU - Wang, S. J.

AU - He, P.

AU - Sekulic, D. P.

AU - Jia, D. C.

PY - 2017/8

Y1 - 2017/8

N2 - The Co22.5Si77.5 (at.%) braze was used to bond porous Si3N4 ceramics. The effects of brazing temperature on microstructure and the bonding strength of the joint were studied. The results reveal that no visible reaction layer was observed. The corresponding joint strength was low. In order to improve the joint strength a carbon coated modification of the porous Si3N4 substrate was suggested. The impact of this modification on the joint properties was examined. It was established that a SiC reaction layer with a thickness from ∼15 μm to ∼65 μm was formed at the interface and SiC nanowires were observed when the temperature increased from 1280 °C to 1340 °C. The maximum shear strength of the carbon coated and uncoated joints were 115 MPa and 44 MPa, respectively. The significant improvement of the joint strength was attributed to the SiC reaction layer and a strengthening by the presence of SiC nanowires.

AB - The Co22.5Si77.5 (at.%) braze was used to bond porous Si3N4 ceramics. The effects of brazing temperature on microstructure and the bonding strength of the joint were studied. The results reveal that no visible reaction layer was observed. The corresponding joint strength was low. In order to improve the joint strength a carbon coated modification of the porous Si3N4 substrate was suggested. The impact of this modification on the joint properties was examined. It was established that a SiC reaction layer with a thickness from ∼15 μm to ∼65 μm was formed at the interface and SiC nanowires were observed when the temperature increased from 1280 °C to 1340 °C. The maximum shear strength of the carbon coated and uncoated joints were 115 MPa and 44 MPa, respectively. The significant improvement of the joint strength was attributed to the SiC reaction layer and a strengthening by the presence of SiC nanowires.

KW - Brazing

KW - Co-Si filler

KW - Porous SiN

KW - SiC nanowires

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