The Effect of Eta Phase on the Properties of CVD TiC ‐ Coated Cemented Carbide Cutting Tools

Sarin, V.K.; Lindström, J.

doi:10.1149/1.2129257

Cited by 35 publications

(4 citation statements)

References 7 publications

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“…A carbon deficiency, known as ETA phase, occurs if powder preparation and sintering are not performed properly. 1 This is an intermediate phase of cobalt and tungsten carbide that causes brittleness and lower forms of carbides known as W 2 C. In ETA phase the cobalt binder is absorbed into tungsten, creating areas of binder less carbide. 2 Weakness is initiated at the soft spots then propagates throughout the tool or part making it highly vulnerable to breakage when force is applied.…”

Section: Microstructural Examinationmentioning

confidence: 99%

“…Several investigations involving a series of experiments to determine the EDM performance and feasibility of its applications in difficult to machine materials have been reported. [1][2][3][4][5][6][7][8] Although EDM is extensively used for shaping the cemented carbide parts but the machining parameters have not been optimised. The published work on EDM of cemented tungsten carbide has shown a lot of variations in their results.…”

Section: Introductionmentioning

confidence: 99%

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Failure analyses of cemented tungsten carbide extrusion die

Khatter¹,

Sethi²,

Pandey

2009

Tribology - Materials, Surfaces & Interfaces

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In this study, the failure of a cemented tungsten carbide extrusion die (WC-Co) which was designed for the production of 55 000 components but failed during production of third component has been investigated. The die is used for cold extrusion of auto parts components as sizing die. Sizes achieved by forging process are further refined to required fine tolerance. The component size is required to be controlled within ¡20 mm. The investigations revealed that the failure is due to abusive machining of cemented tungsten carbide. Detail studies under different electrical discharge machining conditions have been made to investigate the formation of cracks and their morphology. The major cause of the failure is established as abusive electrical discharge machining conditions with higher pulse current, which lead to micro-to macrocracks at the machining stage. These cracks further enlarged under load conditions when extrusion was done. Based on this study experiments were performed under different machining conditions on the WC-Co material. Optimum parameters were established for machining and accordingly new die was designed and fabricated which is performing very well.

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Section: Microstructural Examinationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Failure analyses of cemented tungsten carbide extrusion die

Khatter¹,

Sethi²,

Pandey

2009

Tribology - Materials, Surfaces & Interfaces

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“…A commonly used coating method, the CVD method, conducted at high temperatures in the range of 700-1100 • C, has been shown to result in eta (η)-phase formation in the form of metal carbides (M 6 C, M 12 C) in the diffusion zone between the coating and the carbide substrate, as shown in many studies [14]. This eta phase occurrence has been linked to degradation of cemented carbides' mechanical properties and poor adhesion between the coating and the substrate [15,16]. In some applications where high loads are not present and wear resistance is crucial demand, Co powders in a horizontal ball mill (Netzsch FMT, Selb, Germany), 2 wt.% of plasticizers in the form of paraffin was added to the powder mixture to assure good formability of the raw material during the compaction process.…”

Section: Introductionmentioning

confidence: 96%

Analysis of Different Complex Multilayer PACVD Coatings on Nanostructured WC-Co Cemented Carbide

et al. 2021

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The development of cemented carbides nowadays is aimed at the application and sintering of ultrafine and nano-sized powders for the production of a variety of components where excellent mechanical properties and high wear resistance are required for use in high temperature and corrosive environment conditions. The most efficient way of increasing the tribological properties along with achieving high corrosion resistance is coating. Using surface processes (modification and/or coating), it is possible to form a surface layer/base material system with properties that can meet modern expectations with acceptable production costs. Three coating systems were developed on WC cemented carbides substrate with the addition of 10 wt.% Co using the plasma-assisted chemical vapor deposition (PACVD) method: single-layer TiN coating, harder multilayer gradient TiCN coating composed of TiN and TiCN layers, and the hardest multilayer TiBN coating composed of TiN and TiB2. Physical and mechanical properties of coated and uncoated samples were investigated by means of quantitative depth profile (QDP) analysis, nanoindentation, surface layer characterization (XRD analysis), and coating adhesion evaluation using the scratch test. The results confirm the possibility of obtaining nanostructured cemented carbides of homogeneous structure without structural defects such as eta phase or unbound carbon providing increase in hardness and fracture toughness. The lowest adhesion was detected for the single-layer TiN coating, while coatings with a complex architecture (TiCN, TiBN) showed improved adhesion.

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“…Uma vez que a fase η possui uma densidade mais alta que a do substrato da qual ele é formado, poros podem ser gerados em função da contração volumétrica que ocorre durante a sua formação. (SATIN et al, 1979) Os carbetos η geralmente encontrados na camada descarbonetada são W 3 Co 3 C ou W 6 Co 6 C e promovem uma considerável redução na resistência à ruptura e na tenacidade dos insertos de metal duro revestido pelo processo CVD térmico. A subcamada descarbonetada onde ocorre o decréscimo da concentração de carbono no Co é visível próximo à interface com a camada de TiC aplicado pelo processo CVD, porém possui espessura maior, atingindo até mais de 100 μm.…”

Section: Carbeto De Titâniounclassified

Influência da texturização laser na vida de ferramentas de torneamento revestidas por CVD e PVD

Neves¹,

Diniz²

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The Effect of Eta Phase on the Properties of CVD TiC ‐ Coated Cemented Carbide Cutting Tools

Abstract: In spite of chemically vapor deposited (CVD) TiC-coated cemented tungsten carbide cutting tools being widely used, the influence of intermediate zones of eta phase (e.g., M12C

Cited by 35 publications

References 7 publications

Failure analyses of cemented tungsten carbide extrusion die

Failure analyses of cemented tungsten carbide extrusion die

Analysis of Different Complex Multilayer PACVD Coatings on Nanostructured WC-Co Cemented Carbide

Influência da texturização laser na vida de ferramentas de torneamento revestidas por CVD e PVD

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