Diamond Coatings

2010 ◽  
pp. 293-356
Author(s):  
James Chien-Min Sung ◽  
Ming-Chi Kan ◽  
Jyh-Ming Ting ◽  
Wan-Yu Wu
Keyword(s):  
Diamond Coatings

scholarly journals Multilayer Diamond Coatings Applied to Micro-End-Milling of Cemented Carbide

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3333
Author(s):  
Eduardo L. Silva ◽  
Sérgio Pratas ◽  
Miguel A. Neto ◽  
Cristina M. Fernandes ◽  
Daniel Figueiredo ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
End Milling ◽  
Interfacial Stress ◽  
Cemented Carbide ◽  
Air Cooling ◽  
Micro Machining ◽  
Diamond Coatings ◽  
Wear Properties ◽  
High Adhesion ◽  
Micro End Milling

Cobalt-cemented carbide micro-end mills were coated with diamond grown by chemical vapor deposition (CVD), with the purpose of micro-machining cemented carbides. The diamond coatings were designed with a multilayer architecture, alternating between sub-microcrystalline and nanocrystalline diamond layers. The structure of the coatings was studied by transmission electron microscopy. High adhesion to the chemically pre-treated WC-7Co tool substrates was observed by Rockwell C indentation, with the diamond coatings withstanding a critical load of 1250 N. The coated tools were tested for micro-end-milling of WC-15Co under air-cooling conditions, being able to cut more than 6500 m over a period of 120 min, after which a flank wear of 47.8 μm was attained. The machining performance and wear behavior of the micro-cutters was studied by scanning electron microscopy and energy-dispersive X-ray spectroscopy. Crystallographic analysis through cross-sectional selected area electron diffraction patterns, along with characterization in dark-field and HRTEM modes, provided a possible correlation between interfacial stress relaxation and wear properties of the coatings. Overall, this work demonstrates that high adhesion of diamond coatings can be achieved by proper combination of chemical attack and coating architecture. By preventing catastrophic delamination, multilayer CVD diamond coatings are central towards the enhancement of the wear properties and mechanical robustness of carbide tools used for micro-machining of ultra-hard materials.

Effects of thickness and cycle parameters on fretting wear behavior of CVD diamond coatings on steel substrates

2010 ◽  
Vol 205 (1) ◽  
pp. 158-167 ◽  
Author(s):  
Qiuping Wei ◽  
Z.M. Yu ◽  
Michael N.R. Ashfold ◽  
Z. Chen ◽  
L. Wang ◽  
...  
Keyword(s):  
Wear Behavior ◽  
Cvd Diamond ◽  
Fretting Wear ◽  
Diamond Coatings ◽  
Steel Substrates

Effects of Two-Step DC Electrochemical Pretreatment of Fine Grinding WC-Co Tool Surface on Morphology and Quality of Diamond Coatings

2011 ◽  
Vol 337 ◽  
pp. 59-62
Author(s):  
Xiang Hui Zhang ◽  
Ling Wang ◽  
Jian Ping Long
Keyword(s):  
Surface Morphology ◽  
Direct Current ◽  
Arc Discharge ◽  
Etching Time ◽  
Diamond Coating ◽  
Diamond Coatings ◽  
Fine Grinding ◽  
Electrolytic Etching ◽  
Electrochemical Pretreatment

In the present investigation, diamond coating was deposited on fine grinding cemented carbide substrate by direct current arc discharge chemical vapor deposition. The effect of electrolytic etching time in the two-step electrochemical pretreatment process (firstly using electrolytic etching, and then using acid etching) on morphology and quality of the diamond coating were systemically studied. The surface morphology feature and quality of diamond coatings were characterized by means of Scanning Electron Microscope (SEM), laser Raman spectrometer respectively. The results showed that the electrolytic etching duration has distinctly effect on the quality and crystal features such as morphology, crystal type and grain size of diamond coating. It showed that as electrolytic current is direct current 3A, electrolytic etching time altering from 0.5 min to 7.5min, the surface morphology of diamond films gradually transition from microcrystalline cubic-octahedron to cauliflower type nanocluster, and further increase the electrolytic etching time, will lead to several negative effects on the quality and nucleation of the coatings which is not only retard the diamond nucleation, but also promote the formation of graphite.

Development in Mechanics Research of Diamond Coatings/WC Interface Based on Molecular Dynamics Simulation

2014 ◽  
Vol 898 ◽  
pp. 41-46
Author(s):  
Xiao Gang Jian ◽  
Yun Hua Zhang
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Adhesive Strength ◽  
Deposition Process ◽  
Dynamics Simulation ◽  
Microscopic Structure ◽  
Diamond Coatings ◽  
Paper Briefly ◽  
Film Substrate ◽  
Important Significance

This paper briefly reviews the overseas and domestic research status of the mechanics of hetero film-substrate interface based on molecular dynamics simulation, on this basis building the accurate model of diamond coatings/WC interface and executing the molecular dynamic simulation, exactly measuring the adhesive strength of the diamond coatings/WC interface, finally exploring the influence of interface scales on the adhesive strength of the diamond coatings/WC interface and verifying the feasibility of studying the microscopic structure by molecular dynamics simulation to characterize the mechanical properties of macrostructure, which has important significance for optimizing deposition process of diamond coatings to improve the adhesive strength of the interface.

Growth of diamond coatings on functionally graded cemented carbides

2015 ◽  
Vol 49 ◽  
pp. 307-313 ◽  
Author(s):  
Yong Liu ◽  
Meng Du ◽  
Mingyang Zhang ◽  
Qiuping Wei ◽  
Zhiming Yu ◽  
...  
Keyword(s):  
Functionally Graded ◽  
Cemented Carbides ◽  
Diamond Coatings

Influence of Technical Parameters on the Residual Stress in the Diamond Coating

2012 ◽  
Vol 426 ◽  
pp. 85-88
Author(s):  
Hong Xiang Wang ◽  
Dun Wen Zuo ◽  
Chun Xu ◽  
Chun Zhou
Keyword(s):  
Residual Stress ◽  
Substrate Temperature ◽  
Compressive Stress ◽  
Crystalline Silicon ◽  
Volume Ratio ◽  
Chemical Vapor ◽  
Chamber Pressure ◽  
Diamond Coating ◽  
Diamond Coatings ◽  
Technical Parameters

The diamond coatings were prepared by hot filament chemical vapor deposition(HFCVD) on the mono-crystalline silicon substrates. The influence of the technical parameters such as methane volume ratio, substrate temperature and reaction pressure on the residual stress in the diamond coating was studied. The results showed that the residual stress in the coating was compressive stress in the range of parameters studied, and too high or too low substrate temperature, chamber pressure and methane volume ratio would all increase the residual compressive stress. This relationship can be explained by the influence of amorphous carbon content, vacancy density and grain size on the residual stress.

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