Research on the chemical barrier and failure behavior of WS2 and WS2/Ti coatings under high-temperature conditions and the effects on the lifespan of diamond-coated cutting tools

With its outstanding performance as a solid lubricant, WS2 has found applications in cutting tools. Diamond-coated tools often experience the formation of a graphite phase during machining of ferrous metals. The WS2 coating effectively hinders the thermochemical reaction between the tool-chip and to...

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Bibliographic Details
Published inSurface & coatings technology Vol. 469; p. 129795
Main Authors Zhang, Zhao, Tan, Zhuoming, Lu, Wenzhuang, Yi, Siguang, Qin, Xudong
Format Journal Article
LanguageEnglish
Published Elsevier B.V 25.09.2023
Subjects
Chemical barrier
Diamond coating
High temperature
Turning tool
WS2/Ti
WS2/Ti
Turning tool
High temperature
Chemical barrier
Diamond coating
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Summary:With its outstanding performance as a solid lubricant, WS2 has found applications in cutting tools. Diamond-coated tools often experience the formation of a graphite phase during machining of ferrous metals. The WS2 coating effectively hinders the thermochemical reaction between the tool-chip and tool-work, thereby extending the tool's operational lifespan. However, WS2 is susceptible to oxidation at high temperatures, leading to the loss of its lubricating properties. Therefore, improvements in its high-temperature resistance are necessary. This study proposes a WS2/Ti multilayer coating structure, which enables the development of solid lubricating coatings (SLC) that are better suited for high-temperature environments. Through the application of negative bias, Ti atoms are propelled into the gaps within the WS2 dendritic structure at high velocities, thereby forming metallic bonds between the layered structures. This process reduces the transfer film effect and hinders the rapid degradation of the SLC. Additionally, the Ti layer forms a sealing barrier on the surface of WS2, effectively impeding contact between WS2 and O2, minimizing WS2 oxidation, and prolonging the SLC's operational lifespan at elevated temperatures. •The interfacial friction behavior of WS2/diamond coating was investigated.•The mechanism of WS2 inhibiting diamond graphitization was analyzed.•Analysis of substances and chemical reactions at friction interfaces.•WS2/Ti/diamond coating with high temperature adaptability are proposed.•The service life of diamond coated tool was greatly improved.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2023.129795