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Fabrication of WC/Fe/WC laminar film on tungsten based on in-situ ceramization.

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Title: Fabrication of WC/Fe/WC laminar film on tungsten based on in-situ ceramization.
Authors: Zhao, Ziyuan1 (AUTHOR) zhaoziyuan@xaut.edu.cn, Wang, Huitao1 (AUTHOR) huitaowang97@163.com, Yu, Yanbo1 (AUTHOR), Zhong, Lisheng1 (AUTHOR), Li, Junming1 (AUTHOR), Zhao, Jingzhong1 (AUTHOR), Tong, Lijia1,2 (AUTHOR) 2007tonglijia@163.com
Source: Ceramics International. Mar2026, Vol. 52 Issue 8, p10920-10927. 8p.
Subjects: Carburization, Tungsten, Metallic composites, Microhardness, Cohesion, Fracture toughness
Abstract: In this study, a novel method for fabricating a laminar WC/Fe/WC film on tungsten is proposed based on an in-situ ceramization mechanism. Instead of direct deposition, a W-Fe bilayer was first deposited on a W substrate and then converted into a WC/Fe/WC trilayer film via carburization, which transformed both the deposited W layer and the surface layer of substrate into WC. The WC layers contained a very high volume fraction of WC phase, and the intermediate Fe layer was composed of α-Fe. The interfaces between layers were serrated and metallurgically bonded, and the film-substrate interface was located inside the original W substrate. The film showed a microhardness of 1477 HV and a fracture toughness of 6.3 MPa m1/2. The α-Fe layer enhanced the ductility and toughness of the material by undergoing plastic deformation under external load and effectively arresting crack propagation during fracture. Scratch tests revealed strong adhesion, with the inner WC layer remaining protective under 90 N load. This approach offers a viable route for designing ceramic-metal multilayer films. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:In this study, a novel method for fabricating a laminar WC/Fe/WC film on tungsten is proposed based on an in-situ ceramization mechanism. Instead of direct deposition, a W-Fe bilayer was first deposited on a W substrate and then converted into a WC/Fe/WC trilayer film via carburization, which transformed both the deposited W layer and the surface layer of substrate into WC. The WC layers contained a very high volume fraction of WC phase, and the intermediate Fe layer was composed of α-Fe. The interfaces between layers were serrated and metallurgically bonded, and the film-substrate interface was located inside the original W substrate. The film showed a microhardness of 1477 HV and a fracture toughness of 6.3 MPa m1/2. The α-Fe layer enhanced the ductility and toughness of the material by undergoing plastic deformation under external load and effectively arresting crack propagation during fracture. Scratch tests revealed strong adhesion, with the inner WC layer remaining protective under 90 N load. This approach offers a viable route for designing ceramic-metal multilayer films. [ABSTRACT FROM AUTHOR]
ISSN:02728842
DOI:10.1016/j.ceramint.2026.01.229