scholarly journals Design of Deterministic Microstructures as Substrate Pre-Treatment for CVD Diamond Coating

Surfaces ◽  
2019 ◽  
Vol 2 (3) ◽  
pp. 497-519
Author(s):  
Richard Börner ◽  
Michael Penzel ◽  
Thomas Junge ◽  
Andreas Schubert
Keyword(s):  
Substrate Surface ◽  
Chemical Vapor ◽  
Cvd Diamond ◽  
Functional Surface ◽  
Cooling Process ◽  
Finite Elements Analysis ◽  
Pre Treatment ◽  
Cvd Diamond Coating ◽  
Steel Substrates ◽  
Suitable Process

The coating of highly stressed components with chemical vapor deposition (CVD) diamond can extend their lifetime. In particular, the combination of steel substrates with diamond layers would find many applications in industrial production. However, there are some challenges, for example, the high mismatch in the thermal expansion between steel and diamond, which commonly leads to the delamination of the coating. Thus, a pre-treatment of the substrate surface is needed. Particle blasting has been established in some studies as a suitable process. However, apart from particle residues in the surface of the substrate, these surfaces have a stochastic character, which limits their reproducibility and modification options. This paper presents some instructions for the recording and derivation of defined properties of those surfaces. The conversion of characteristic surface features into quantitative process parameters could serve as the foundation for the manufacturing of deterministic microstructures, especially those produced by ultrasonic vibration superimposed machining. This should increase the reproducibility and the possibilities of the modification with regard to the structural shaping of the functional surface. The design was developed using both a kinematic surface simulation tool as well as a finite elements analysis for the cooling process of the coating–substrate–composite. A high accordance with real finished surfaces was achieved.

Nondestructive Evaluation of CVD Diamond Coating Layers Using the Leaky Rayleigh Surface Wave

2006 ◽  
Vol 326-328 ◽  
pp. 701-704 ◽  
Author(s):  
Wen Wu Wang ◽  
Sung Jin Song ◽  
Hak Joon Kim ◽  
Dong Ju Yang ◽  
Sung Duk Kwon
Keyword(s):  
Surface Wave ◽  
Nondestructive Evaluation ◽  
Coating Layer ◽  
Chemical Vapor ◽  
Cvd Diamond ◽  
Diamond Coating ◽  
Rayleigh Surface Wave ◽  
Mechanical Parts ◽  
Time Trace ◽  
Cvd Diamond Coating

Chemical vapor deposit (CVD) diamond coating layer is expected to extend the lifetime of mechanical parts that are used severely abrasive conditions. However, one of the most severe problems is that the delamination between the CVD diamond coating layer and the silicon substrate occurs frequently due to large difference in the material properties. Therefore, the nondestructive evaluation of adhesive property of CVD diamond coating layer is needed. To address such a need, back-scattered Rayleigh surface wave is currently applied. However, the interpretation of the acquired signal is not easy at all. To take care of such a difficulty, we proposed the time trace angular scan (TTAS) plot and the frequency spectrum angular scan (FSAS) plot that can make possible of the systematic interpretation of the back-scattered signals from the diamond coating layer. In this paper, the concept of the TTAS and FSAS plots and the experimental results presented to demonstrate the effectiveness of the proposed approach.

Analysis of Interlayer between WC–Co and CVD Diamond Film

2008 ◽  
Vol 375-376 ◽  
pp. 92-96 ◽  
Author(s):  
Wen Zhuang Lu ◽  
Dun Wen Zuo ◽  
Min Wang ◽  
Feng Xu
Keyword(s):  
Cutting Tools ◽  
Chemical Vapor ◽  
Cvd Diamond ◽  
Diamond Coatings ◽  
X Ray Diffraction ◽  
Raman Scattering Spectroscopy ◽  
Electron Probe Micro Analyzer ◽  
Mechanical Bond ◽  
Cvd Diamond Coating ◽  
Better Than

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.

A new interlayer approach for CVD diamond coating of steel substrates

2004 ◽  
Vol 13 (4-8) ◽  
pp. 828-833 ◽  
Author(s):  
F.J.G. Silva ◽  
A.J.S. Fernandes ◽  
F.M. Costa ◽  
A.P.M. Baptista ◽  
E. Pereira
Keyword(s):  
Cvd Diamond ◽  
Diamond Coating ◽  
Cvd Diamond Coating ◽  
Steel Substrates

Mechanical Characterization of a CVD Diamond Coating by Nanoindentation Test

2003 ◽  
Vol 125 (3) ◽  
pp. 309-314 ◽  
Author(s):  
L. Bruno ◽  
F. M. Furgiuele ◽  
G. Sciume´
Keyword(s):  
Chemical Vapor ◽  
Young Modulus ◽  
Fem Analysis ◽  
Cvd Diamond ◽  
Nanoindentation Test ◽  
Displacement Curve ◽  
Chemical Vapor Deposition Diamond ◽  
Hardening Law ◽  
Cvd Diamond Coating

A FEM analysis was carried out to study the mechanical behavior of a hard coating subjected to a nanoindentation test performed with a Berkovich indenter. The nanoindentation test was simulated by FEM code MSC Marc. The case study is a coating of CVD (Chemical Vapor Deposition) diamond. By the simulation it is possible to obtain the load-displacement curve by which Young modulus and hardness may be evaluated. The paper also analyzes the residual stresses developed at the end of the unloading phase and the influence of the strengthening law to determine the hardness and the elastic modulus of the CVD diamond. The analysis has demonstrated, by the comparison with the experimental results, that the numerical model well describes the behavior of the coating of CVD diamond in the nanoindentation test; in addition it was pointed out that the choice of the hardening law is a crucial aspect in the simulation.

scholarly journals Effect of Surface Pre-Treatment on Adhesive Strength of Multi-Component Vacuum-Arc Coatings

2020 ◽  
Keyword(s):  
Crystal Lattice ◽  
Adhesive Strength ◽  
Substrate Surface ◽  
Lattice Parameter ◽  
Vacuum Arc ◽  
Surface Pretreatment ◽  
Vacuum Arc Remelting ◽  
Polished Stainless Steel ◽  
Pre Treatment ◽  
Steel Substrates

The results of investigations of multi-component nanostructured coatings of (TiAlSiY)N/CrN type are presented. The influence of different variants of substrate surface pretreatment on adhesive strength and hardness of coatings was studied. Pre-treatment of samples was carried out in plasma of two-stage gas discharge according to various technological schemes. Except for ion-plasma purification, some samples were pretreated with a sublayer of chromium within 5 minutes. The coatings were formed by a vacuum-arc deposition method at simultaneous spraying of two cathode targets. The first cathode is made of chromium, and the second cathode is made of multicomponent Ti - Al - Si - Y alloy obtained by vacuum-arc remelting of powder mixture of the mentioned elements. The coatings were deposited on polished stainless-steel substrates at negative 280 V bias potential. The geometry of the unit and its elements, as well as technological characteristics of the processes of evaporation-condensation were selected so that at a speed of rotation of samples 8 revolutions per minute the formation of the coating with a total thickness of about 9.0 microns occurred in approximately 60 minutes. The analysis of the composition of the coatings shows that the content of elements in the coating differs greatly from the content of elements in the sprayed cathodes. The X-ray diffractometry has shown that all deposition modes are characterized by the formation of phases with cubic (fcc) crystal lattice in both phase layers of multilayer coatings. In the layers formed at spraying of TiAlSiY alloy, a multi-element disordered solid solution (TiAlSiY)N with a crystal lattice of NaCl type and a lattice parameter of 0.4241 nm, as well as chromium mononitride CrN with a lattice parameter of 0.4161 nm, is determined. It has been established that preliminary formation of a chromium sublayer on the substrate leads to significant changes in adhesive strength of multi-component coatings compared to coatings without a sublayer.

Composite intermediate layer for CVD diamond film on steel substrate

MRS Advances ◽  
2017 ◽  
Vol 2 (41) ◽  
pp. 2211-2216 ◽  
Author(s):  
Andre Contin ◽  
Getúlio de Vasconcelos ◽  
Djoille D. Damm ◽  
Vladimir J. Trava-Airoldi ◽  
Raonei A. Campos ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Diamond Film ◽  
Steel Substrate ◽  
Substrate Surface ◽  
Composite Layer ◽  
Chemical Vapor ◽  
Cvd Diamond ◽  
Substrate Material ◽  
Film Deposition ◽  
Carbon Solubility

ABSTRACTThe union of the unique diamond properties with steel (most common substrate material) provides a new solution for machine parts under critical mechanical conditions and severe environmental. However, CVD diamond coating directly on steel comes with several issues. The fundamental reasons for the lack of adhesion are an iron catalytic effect, the high carbon solubility in iron and high mismatch in thermal expansion coefficient of diamond and steel. The use of interlayer may solve these issues acting as a diffusion barrier, for both iron and carbon, and match thermal expansion coefficients. Several articles describe the PVD deposition or electroplated interlayer. In the present study, the diamond film coated steel with an intermediate barrier deposited by laser cladding process. In this novel technique, laser irradiation melts the powder (preplaced) and the substrate surface to create the coating on a steel substrate. We used the SiC/Ti and SiC/Cu powder mixtures to create the intermediate barrier. Diamond film deposition was carried out in an HFCVD reactor (Hot Filament Chemical Vapor Deposition). The samples characterization included X-ray Diffraction (XRD); Field Emission Gun - Scanning Electron Microscopy (FEG-SEM) and Raman Scattering Spectroscopy (RSS). Results showed that laser incidence dissociated partially the SiC powder, forming FeSi, Cu3Si phases. Further, the composite layer assisted the high thermal stress relief in steel/diamond interface.

Impinging Flame Prediction for CVD Diamond Synthesis

1993 ◽  
Author(s):  
Mingchun Dong ◽  
David G. Lilley
Keyword(s):  
Surface Temperature ◽  
Substrate Surface ◽  
Synthesis Method ◽  
Chemical Vapor ◽  
Cvd Diamond ◽  
Separation Distance ◽  
Diamond Growth ◽  
Chemical Vapor Deposition Diamond ◽  
Diamond Synthesis ◽  
Complex Chemistry

Abstract High-temperature flames impinging normally onto adiabatic surfaces are considered. These are important in the CVD (chemical vapor deposition) diamond synthesis method for diamond growth on surfaces. Problems of complex chemistry and the mechanism of diamond growth are discussed. The present paper has illustrated the effects of several key parameters on the substrate surface temperature and flowfield for CVD diamond synthesis by impinging oxy-acetylene jet flames. The studies were concerned with combustion flowfield predictions, oxy-acetylene flames, axisymmetric-vertical impingement on an adiabatic surface, and the effects of varying the nozzle-substrate separation distance, nozzle size, overall equivalence ratio and flow rate on the substrate surface temperature and flowfield. This investigation provides a key to linking the flame with diamond growth rate on the substrate surface, complements the other facets of the project, and shows that the parametric influences can be predicted with relative ease, thereby extending the range of previously found experimental data.

Vitreous Enamel Coating on Steel Substrates

2009 ◽  
Vol 147-149 ◽  
pp. 856-860 ◽  
Author(s):  
Kamila Hrabovská ◽  
Jitka Podjuklová ◽  
Karla Barčová ◽  
Lenka Dobrovodská ◽  
Katerina Pelikánová
Keyword(s):  
Enamel Coating ◽  
Steel Substrate ◽  
Substrate Surface ◽  
Phase Interface ◽  
Adhesive Properties ◽  
Vitreous Enamel ◽  
Enamel Slip ◽  
Pre Treatment ◽  
Steel Substrates

Vitreous enamel is a glassy coating formed on a metal substrate by firing at temperatures above 800 °C. The quality of vitreous enamel coating depends on the pre-treatment of the steel substrate surface and the quality of enamel slip. The main aim of this study was to characterize the composition of the steel substrate surface after firing with double finish, to explain the effect of steel substrate surface pre-treatment (blasting, acid pickling) on forming the phase interface of the steel substrate – vitreous coating system, and on its final microhardness, fracture strength and the adhesive properties of the coating. To achieve these aims, the following experimental methods were used: Mössbauer spectroscopy, X-ray diffraction, electron analyzer, and EDAX. Based on the chemical composition of the initial enamel slip and the firing technology, the metal - enamel system interface exhibited various ratios of layers of magnetite, hematite, nonstoichiometric wüstite, and crystals of faylite. The measuring results indicate that the quality and age of enamel slip influences the brittle fracture properties of vitreous enamel coating.

scholarly journals Influence of the surface microstructure on the adhesion of a CVD-diamond coating on steel with a CrN interlayer

2018 ◽  
Vol 190 ◽  
pp. 14008 ◽  
Author(s):  
Markus Prieske ◽  
Richard Börner ◽  
Andreas Schubert
Keyword(s):  
Polycrystalline Diamond ◽  
Cvd Diamond ◽  
Surface Microstructure ◽  
Diamond Coating ◽  
Diamond Coatings ◽  
Surface Microstructures ◽  
The One ◽  
Cvd Diamond Coating ◽  
Surface Prediction ◽  
Steel Substrates

forming tool coating. Most of the forming tools are made of steel, so that especially the coatability of steel by a polycrystalline diamond coating would rise the range of fields of application. The polycrystalline CVD-diamond coatings are deposited by a laser induced plasma CVD process, without a vacuum chamber. Various surface microstructures were investigated regarding their influence on the residual stresses to prevent a flaking of the coating: on the one hand, deterministic structures generated by ultrasonic vibration assisted milling (UVAM) and on the other hand, stochastic structures manufactured by blasting and polishing processes. For the UVAM, a surface prediction tool was used to design the surface microstructure beforehand. All steel substrates (material no. 1.2379) were coated in one batch by high-power impulse magnetron sputtering with a chromium nitride coating with a thickness of 2.4 μm. The specimens were analysed by laser microscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy and Raman spectroscopy. None of the microstructures investigated in this study was able to prevent delamination of the coating entirely. It could be shown that a roughness higher than Sa 0.1μm supports the interlocking between coating and surface as well as that sharp peaks inhibit a homogenous diamond coating deposition.

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