WCCo cutting tool inserts with diamond coatings

Silva, S.; Mammana, Victor Pellegrini; Salvadori, M. C.; Monteiro, O.R.; Brown, I.G.

doi:10.1016/s0925-9635(99)00156-9

Cited by 71 publications

(24 citation statements)

References 19 publications

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“…To the contrary, using the diode laser at proper energy density (30)(31)(32)(33)(34)(35)(36)(37)(38)(39)(40) MW/cm 2 , that is, 1100-1400 W) allows to selectively remove the Co binder, without largely affecting the WC grains (Figure 4c). Accordingly, the laser-treated surface is mostly Co-free, microcorrugated and without any large thermal alteration.…”

Section: Analysis Of Surface Morphology and Thermal Phenomena Involvementioning

confidence: 99%

“…This, sometimes, also corrugates the WC grains [18][19][20][21][22][23][24][25][26]; (ii) use of intermediate layers of various materials (amorphous carbon, metallic Cr, Ti, Ta, etc. and ceramic CrN, TiC, TiN, SiC, Si3N4) onto the WC-Co surface preventing Co and C diffusion [27][28][29][30][31][32][33][34]. In addition, interlayers can be designed to adjust the thermal expansion coefficients between WC-Co and diamond, thus reducing thermal residual stresses inside the diamond coating during CVD [35][36]; (iii) mechanical treatments, in which mechanical interlocking between diamond and WC-Co is promoted by micro-or macrocorrugating WC-Co or the interlayer surface [36][37][38].…”

Section: Introductionmentioning

confidence: 99%

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Co removal and phase transformations during high power diode laser irradiation of cemented carbide

Barletta¹,

Rubino²,

Gisario³

2011

Applied Surface Science

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Abstract.The use of a continuous wave-high power diode laser for removing surface Co-binder from Cocemented tungsten carbide (WC-Co (5.8 % wt.)) hardmetal slabs was investigated. Combined scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray diffraction analyses were performed in order to study the phase transformations and micro-structural modifications of the WC-Co substrates occurring during and after laser irradiation. The micro-structure of the WCCo progressively transforms as energy density increased, exhibiting stronger removal of Co and WC grain growth. At very high energy density, local melting of the WC grains with the formation of big agglomerates of interlaced grains is observed, and the crystalline structure of the irradiated substrate shows the presence of a brittle ternary eutectic phase of W, Co and C (often referred to as the -phase). The latter can be detrimental to the mechanical properties of WC-Co. Therefore, the proper adjustment of the laser processing parameters plays a crucial role in surface treatments of WC-Co substrates prior to post-processing like diamond deposition.

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Section: Analysis Of Surface Morphology and Thermal Phenomena Involvementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Co removal and phase transformations during high power diode laser irradiation of cemented carbide

Barletta¹,

Rubino²,

Gisario³

2011

Applied Surface Science

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“…12 In nanoparticle seeding, diamond (or SiC) nanoparticles act as growth centers for subsequent diamond deposition. [13][14][15] This can be further enhanced by applying a voltage bias to the seeded substrate during deposition. 16 17 While it has been proven successful on many different substrates, seeding is time-consuming and can be expensive.…”

Section: Introductionmentioning

confidence: 99%

Sputtered Tungsten-Based Ternary and Quaternary Layers for Nanocrystalline Diamond Deposition

Walock¹,

Rahil²,

Zou³

et al. 2012

j. nanosci. nanotech.

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Many of today's demanding applications require thin-film coatings with high hardness, toughness, and thermal stability. In many cases, coating thickness in the range 2-20 m and low surface roughness are required. Diamond films meet many of the stated requirements, but their crystalline nature leads to a high surface roughness. Nanocrystalline diamond offers a smoother surface, but significant surface modification of the substrate is necessary for successful nanocrystalline diamond deposition and adhesion. A hybrid hard and tough material may be required for either the desired applications, or as a basis for nanocrystalline diamond film growth. One possibility is a composite system based on carbides or nitrides. Many binary carbides and nitrides offer one or more mentioned properties. By combining these binary compounds in a ternary or quaternary nanocrystalline system, we can tailor the material for a desired combination of properties. Here, we describe the results on the structural and mechanical properties of the coating systems composed of tungstenchromium-carbide and/or nitride. These WC-Cr-(N) coatings are deposited using magnetron sputtering. The growth of adherent nanocrystalline diamond films by microwave plasma chemical vapor deposition has been demonstrated on these coatings. The WC-Cr-(N) and WC-Cr-(N)-NCD coatings are characterized with atomic force microscopy and SEM, X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy, and nanoindentation.

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“…With reduction of surface cobalt, adhesion of diamond film with WC substrate could be enhanced remarkably 2 . Mechanical or chemical pretreatments, interlayers or combinations of these methods are applied to improve nucleation and adhesion strength [3][4][5][6][7] . All of these techniques are related to the final film structure which determined the adhesion strength.…”

Section: Introductionmentioning

confidence: 99%

Study of diamond film interface structure and contacting area

Setasuwon

Metanawin

2009

Mat. Res.

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High purity diamond film has been grown by refined Combustion Flame method with high oxygen proportion. Snapshots of time series of the diamond film forming were taken and a model was derived. By observing the period of seeding to coalescing of diamond crystals to form film, it is realized that the contacting area is small and the calculated value was less than 15%. It is also found that the base layer of the film was porous as a result of non-uniform crystal growth. To enhance adhesion of the film, the contacting area between the film and the substrate must be increased, and the porous base layer must be thin and dense as much as possible. To achieve that, very high and uniform nucleation is the key. Under this view, the nanocrystalline diamond film on smooth substrate is preferred than rough surface to have strong adhesion.

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WCCo cutting tool inserts with diamond coatings

Cited by 71 publications

References 19 publications

Co removal and phase transformations during high power diode laser irradiation of cemented carbide

Co removal and phase transformations during high power diode laser irradiation of cemented carbide

Sputtered Tungsten-Based Ternary and Quaternary Layers for Nanocrystalline Diamond Deposition

Study of diamond film interface structure and contacting area

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