Comparative Study of Multilayer Hard Coatings Deposited on WC-Co Hardmetals

This paper examines the impact of a multilayered gradient coating, applied via plasma-activated chemical vapor deposition (PACVD), on the structural and mechanical attributes of nanostructured WC-Co cemented carbides. WC-Co samples containing 5 and 15 wt.% Co were synthesized through a hot isostatic...

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Bibliographic Details
Published in:Coatings (Basel) 2024-06, Vol.14 (6), p.674
Main Authors: Šnajdar, Mateja, Ćorić, Danko, Sakoman, Matija
Format: Article
Language:English
Subjects:
Adhesion tests
Adhesive wear
Analysis
Carbides
Carbon
Cemented carbides
Chemical vapor deposition
Cleaning
Coatings
Cobalt
Coercivity
Crystal defects
Cutting tools
Fracture toughness
Gases
Grain growth
Grain size
Hardness
Hardness tests
Hot isostatic pressing
Intermetallic compounds
Magnetic properties
Mechanical properties
Mechanical tests
Microhardness
Modulus of elasticity
Nanoindentation
Nitrides
Protective coatings
Scratch tests
Sliding friction
Substrates
Surface roughness
Temperature
Thickness measurement
Titanium nitride
Tribology
Tungsten alloys
Tungsten carbide
Wear resistance
Wear tests
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Summary:This paper examines the impact of a multilayered gradient coating, applied via plasma-activated chemical vapor deposition (PACVD), on the structural and mechanical attributes of nanostructured WC-Co cemented carbides. WC-Co samples containing 5 and 15 wt.% Co were synthesized through a hot isostatic pressing (HIP) process using nanoparticle powders and coated with two distinct multilayer coatings: titanium nitride (TiN) and titanium carbonitride (TiCN). Nanosized grain formation without microstructural defects of the substrates, prior to coating, was confirmed by magnetic saturation and coercivity testing, microstructural analysis, and field emission scanning electron microscope (FESEM). Nanoindentation, fracture toughness and hardness testing were conducted for uncoated samples. After coatings deposition, characterizations including microscopy, surface roughness determination, adhesion testing, coating thickness measurement, and microhardness examination were conducted. The impact of deposited coatings on wear resistance of produced hardmetals was analyzed via scratch test and dry sliding wear test. Samples with higher Co content exhibited improved adhesion, facilitating surface cleaning and activation before coating. TiN and TiCN coatings demonstrated similar roughness on substrates of identical composition, suggesting Co content’s minimal influence on layer growth. Results of the mechanical tests showed higher microhardness, higher elastic modulus, better adhesion, and overall superior tribological properties of the TiCN coating.
ISSN:2079-6412
2079-6412
DOI:10.3390/coatings14060674