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Diamond coating (1)

F.A. Almeida, A.J.S. Fernandes, R.F. Silva, F.J. Oliveira, Re-sharpenable thick CVD diamond-coated Si3N4 tools for hardmetal turning, Surface & Coatings Technology 201 (2006) 1776-1782.

Edge of the diamond coated silicon nitride tool seen under SEM at 45° tilt (a) after MPCVD growth and (b) after sharpening

SEM photographs of a CVD diamond insert after the first cuttingpass (3 m/s, 0.1 mm/rev, 2 mm, 50 s) showing work material deposition.

Y.K. Chou, J.Liu, CVD diamond tool performance in metal matrix composite machining, Surface & Coatings Technology 200 (2005) 1872-1878.

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Microstructures around the cutting edge of diamond-coated tools: (a) nano-diamond and (b) MCDF. Qin, J. Hu, Y.K. Choua, R.G. Thompson, Delamination wear of nano-diamond coated cutting tools in composite machining, Wear 267 (2009) 991-995.

Cutting edge of a CVD diamond insertY.K. Chou, J.Liu, CVD diamond tool performance in metal matrix

composite machining, Surface & Coatings Technology 200 (2005) 1872-1878.

Diamond coating (2)

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SEM view of the HFCVD diamond film morphology Cross-sectional SEM view of the HFCVD diamond film on Si3N4 tool substrate

R.P. Martinho, F.J.G. Silva, A.P.M. Baptista, Cutting forces and wear analysis of Si3N4 diamond coated tools in high speed machining, Vacuum

82 (2008) 1415-1420.

DLC and CrC/Cr coating over cemented carbide substrate G.R. dos Santos, D.D. da Costa, F.L. Amorim, R.D. Torres, Characterization of DLC thin film and evaluation of machining forces using coated inserts in turning of Al–Si alloys, Surface & Coatings Technology 202 (2007) 1029-1033.

Diamond coating (3)

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SEM micrographs (a) and (c) of the cutting edge of the MCD and NCD diamond coated tools, respectively; (b) and (d) respective microstructure of the diamond film at the rake face

F.A. Almeida, J. Sacramento, F.J. Oliveira, R.F. Silva, Micro- and nano-crystalline CVD diamond coated tools in the turning of EDM graphite, Surface & Coatings Technology 203 (2008) 271-276.

Diamond coating (4)

5 /9 H. Sein, W. Ahmed, I.U. Hassan, N. Ali, J.J. Gracio, M.J. Jackson, Chemical vapour deposition of microdrill cutting edges for micro- and nanotechnology applications, Journal of Materials Science 37 (2002) 5057-5063.

Diamond coating (5)

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Diamond coating (6)

(a) MCD with average grain size of 1-3 μm and (b) fine-grained diamond coatings with average grain size of 30-300 nm

P.J. Heaney, A.V. Sumant, C.D. Torres, R.W. Carpick, F.E. Pfefferkorn, Diamond coatings for micro end mills: Enabling the dry machining of aluminum at the micro-scale, Diamond & Related Materials 17 (2008) 223-233.

P.W. May, CVD Diamond - a New Technology for the Future?, Endeavour Magazine 19(3) (1995) 101-106.

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H.Y. Ueng, C.T. Guo, K.-H. Dittrich, Development of a hybrid coating process for deposition of diamond-like carbon films on microdrills, Surface & Coatings Technology 200 (2006) 2900-2908.

Surface of the uncoated (a) and DLC coated on microdrill (b)

B. Sahoo, A.K. Chattopadhyay, A.B. Chattopadhyay, Development of diamond coated tool and its performance in machining Al–11%Si alloy, Bulletin of Materials Science. 25/6, (2002) 487- 491.

SEM micrograph of cutting edge after diamond deposition

Cross-section of Sandvik Coromant’s GC4225 insert grade with CVD layer of Al2O3Cross-section of a nanocrystalline diamond

coating

a

b

F.J. Teeter , Thin wins, Cutting Tool Engineering 58(10) (2006).

Diamond coating (7)

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A. Flöter, P. Gluche, K. Bruehne, H.J. Fecht, Diamond coat hones the cutting edge, Metal Powder Report 62(2) (2007) 16-20.

SEM pictures of (a) a carbide blade with a cutting angle of 35° coated with diamond and (b) a sharpened, diamond coated, blade. The radius of curvature decreased from approximately 15μm to less than 0,5μm.

Droplets found on the coating’s surface removed during a postfinishing proces

F.J. Teeter , Thin wins, Cutting Tool Engineering 58(10) (2006).

Diamond coating (8)

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P. Gogolewski, J. Klimke, A. Krell, P. Beerc, Al2O3 tools towards effective machining of wood-based materials, Journal of Materials Processing Technology 209 ( 2009 ) 2231-2236.J.Y. Sheikh-Ahmad, J.S. Stewart, H. Feld, Failure characteristics of diamond-coated carbides in machining wood-based composites, Wear 255 (2003) 1433-1437.

F. Eblagon, B. Ehrle, T. Graule, J. Kuebler, Development of silicon nitride/silicon carbide composites for wood-cutting tools, Journal of the European Ceramic Society 27 (2007) 419-428.

Low magnification SEM micrographs showing the clearance face for diamond-coated inserts D1 (a) and D2 (b) after a linear cutting distance of 1525 m, and microstructural details of the diamond film near the cutting edge for the same inserts (c, d)

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