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Graded composite diamond coatings with top-layer nanocrystallinity and interfacial integrity: Cross-sectional Raman mapping
Published in Elsevier B.V.
2014
Volume: 289
   
Pages: 545 - 550
Abstract
Cross-sectional structural characteristics of the CVD diamond coatings deposited on the tungsten carbide (WC-Co) substrates were analysed using Raman imaging technique. The grain size of the nanocrystalline diamond (NCD) coatings was observed to deviate from the nanocrystallinity with increasing thickness and exhibited the surface characteristics of microcrystalline diamond (MCD). However, thick diamond coatings with surface nanocrystallinity is the key requirement for load-bearing tribological applications. Tribological tests have clearly indicated the significance and need for the top-layer nanocrystallinity. Graded composite diamond coatings with an architecture of NCD/transition-layer/ MCD/WC-Co are potentail candiadates to realize thick diamond coatings with top-layer nanocrystallinity. Residual stresses along the cross-section of the graded composite diamond coatings were analysed using Raman imaging technique, which confirmed the improved interfacial integrity of the graded composite diamond coatings. © 2013 Elsevier B.V.
About the journal
JournalData powered by TypesetApplied Surface Science
PublisherData powered by TypesetElsevier B.V.
ISSN01694332
Open AccessNo
Concepts (17)
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    Coatings
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    Grain growth
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    Mapping
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    Nanocrystals
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    Residual stresses
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    SYNTHETIC DIAMONDS
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    Tribology
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    Tungsten carbide
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    Cvd diamond
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    Graded coating
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    MICROCRYSTALLINE DIAMOND
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    NANOCRYSTALLINE DIAMONDS
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    NANOCRYSTALLINITY
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    RAMAN MAPPING
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    Structural characteristics
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    TRIBOLOGICAL APPLICATIONS
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    Composite coatings