Microstructural and Mechanical Characterizations of Mo/W and Mo/Graphite Joints with BNi2 Paste

Xu, Biao, Cai, Yuqi, Haider, Julfikar ORCID: https://orcid.org/0000-0001-7010-8285, Khan, Fahd Nawaz, Shehbaz, Tauheed, Zhao, Hongyang and Mao, Yangwu (2024) Microstructural and Mechanical Characterizations of Mo/W and Mo/Graphite Joints with BNi2 Paste. Advanced Engineering Materials, 26 (1). 2301004. ISSN 1438-1656

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Official URL: http://dx.doi.org/10.1002/adem.202301004

Abstract

Brazing of Mo to W and to graphite is achieved using BNi2 paste (containing Ni, Cr, Si, and B). For the Mo/W or Mo/graphite joint, the joining area consists of a diffusion area and a brazing area. The diffusion area is composed of MoNi and Mo, which is formed by diffusion of the Mo substrate into the braze during brazing. The brazing area of the Mo/W joint contains Ni(ss) (solid solution), Cr(ss), Ni<jats:sub>3</jats:sub>B, CrB, and Ni<jats:sub>4</jats:sub>W, while the brazing area of the Mo/graphite joint mainly comprises Ni(ss), MoNi, Ni<jats:sub>3</jats:sub>B, and CrB. A continuous chromium carbide layer is formed at the brazing area/graphite interface in the Mo/graphite joint due to the reaction of Cr in the BNi2 braze with the graphite. Nanoindentation measurements of the joints show that the diffusion area exhibits the highest hardness and elastic modulus in the joints. The shear strengths of the Mo/W and Mo/graphite joints are 58.1 ± 16.0 and 13.0 ± 4.0 MPa, respectively. The Mo/W and Mo/graphite joints fracture after the shear tests in the W and graphite sides, respectively, near the joining area, indicating that both fractures are caused by the stress concentration in the corresponding areas.

Item Type:	Article (Article)
Peer-reviewed:	Yes
Date Deposited:	28 Nov 2023 08:18
Publisher:	Wiley
Additional Information:	This is the peer reviewed version of the following article: Xu, B., Cai, Y., Haider, J., Khan, F.N., Shehbaz, T., Zhao, H. and Mao, Y. (2023), Microstructural and Mechanical Characterizations of Mo/W and Mo/Graphite Joints with BNi2 Paste. Adv. Eng. Mater. 2301004, which has been published in final form at https://doi.org/10.1002/adem.202301004. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.
Divisions:	Faculties > Science and Engineering
Subject terms:	0912 Materials Engineering, Materials
Data Access Statement:	The data that support the findings of this study are available from the corresponding author upon reasonable request.
URI:	https://e-space.mmu.ac.uk/id/eprint/633391
DOI:	https://doi.org/10.1002/adem.202301004
ISSN	1438-1656
e-ISSN	1527-2648

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