A Comprehensive Account of Biomedical Applications of CVD Diamond Coatings

Electroplated Cr, Ni and Cu were used as interlayer for chemical vapor deposition (CVD) diamond coating on WC–Co cemented carbide cutting tools. The electroplated interlayers were studied by Scanning Electron Microscope (SEM), Electron Probe Micro Analyzer (EPMA) and X-ray diffraction (XRD). The CVD diamond coatings were studied by SEM and Raman Scattering Spectroscopy (Raman). The experimental results show that there is diffusion bonded interface between electroplated layer and WC-Co substrate after H plasma treatment, the bond between electroplated layers and WC-Co substrate changes from mechanical bond to metallurgical bond and the adhesion becomes stronger. Electroplated Cr interlayer forms new phases of Cr3C2 and Cr7C3 under CVD conditions, while electroplated Ni and Cu interlayers do not form carbides under CVD conditions. Cr carbides have good chemical compatibility to diamond, and they are propitious to diamond nucleation and growth during the deposition period. The diamond crystal microstructure, diamond quality and adhesion on Cr interlayer are better than those on electroplated Ni and Cu interlayers.

Download Full-text

Effects of CH4 Concentration on CVD Diamond Coatings Deposited on Cemented Carbide Cutting Cools

Materials Science Forum ◽

10.4028/www.scientific.net/msf.532-533.480 ◽

2006 ◽

Vol 532-533 ◽

pp. 480-483 ◽

Cited By ~ 1

Author(s):

Wen Zhuang Lu ◽

Dun Wen Zuo ◽

Min Wang ◽

Feng Xu

Keyword(s):

Residual Stress ◽

Surface Roughness ◽

Chemical Vapor Deposition ◽

Vapor Deposition ◽

Great Influence ◽

Chemical Vapor ◽

Cvd Diamond ◽

Cemented Carbide ◽

Diamond Coatings ◽

Ch4 Concentration

Chemical vapor deposition (CVD) diamond coatings were deposited on cemented carbide cutting cools by an electron-assisted hot filament chemical vapor deposition (EACVD) equipment developed by the authors. The CVD diamond coatings were studied by Scanning Electron Microscope (SEM) and Raman Scattering Spectroscopy (Raman). The experimental results show that CH4 concentration in the source gas performs great influence on the micro-structure, surface roughness, composition, residual stress and adhesion of the CVD diamond coatings. The increase of CH4 concentration results the change of diamond crystal from {111} orientation to {100} orientation, the decrease of the surface roughness and the increase of sp2 carbon in the CVD diamond coatings. A residual compressive stress exists in the CVD diamond coatings. The residual stress decreases with increasing CH4 concentration. A higher or lower CH4 concentration tends to reduce adhesion stress of the continuous CVD diamond coatings.

Download Full-text

Effect of relative humidity and temperature on the tribology of multilayer micro/nanocrystalline CVD diamond coatings

Diamond and Related Materials ◽

10.1016/j.diamond.2016.09.016 ◽

2017 ◽

Vol 73 ◽

pp. 190-198 ◽

Cited By ~ 7

Author(s):

Shabani M. ◽

Abreu C.S. ◽

Gomes J.R. ◽

Silva R.F. ◽

Oliveira F.J.

Keyword(s):

Relative Humidity ◽

Cvd Diamond ◽

Diamond Coatings

Download Full-text

Effect of a two-step pretreatment method on adhesion of CVD diamond coatings on cemented carbide substrates

Surface and Coatings Technology ◽

10.1016/j.surfcoat.2004.01.027 ◽

2004 ◽

Vol 187 (1) ◽

pp. 33-36 ◽

Cited By ~ 15

Author(s):

Jinqi Miao ◽

Jianhua Song ◽

Yundong Xue ◽

Yumei Tong ◽

Weizhong Tang ◽

...

Keyword(s):

Cvd Diamond ◽

Cemented Carbide ◽

Diamond Coatings ◽

Pretreatment Method

Download Full-text

CVD Coated Diamond Tools for the Machining of Lightweight Materials

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.907.63 ◽

2014 ◽

Vol 907 ◽

pp. 63-73 ◽

Cited By ~ 3

Author(s):

Eckart Uhlmann ◽

Fiona Sammler

Keyword(s):

Cvd Diamond ◽

Diamond Coatings ◽

Silicon Alloys ◽

Diamond Tools ◽

Coating Adhesion ◽

The Past ◽

Coated Tools ◽

Residual Stress Analysis ◽

Materials Used ◽

The Impact

The economic machining of materials used in the automotive and aeronautical industries, such as aluminium silicon alloys is often not possible without the use of superhard tools. CVD diamond coated tools have demonstrated their suitability for these applications in the past, however, the insufficient coating adhesion and thus tool failure remains an issue to date. Within the work presented here, two cemented carbide types were studied as substrates for CVD diamond coatings. Milling and turning tests were undertaken in order to assess the coating adhesion of the diamond tools. Furthermore, residual stress analysis was undertaken with the aim of understanding the impact of the coating and substrate residual stresses on the tool’s process performance.

Download Full-text