Journal ArticleDOI
Deposition, microstructure, and properties of nanocrystalline Ti(C,O,N) coatings
S. Ruppi,A. Larsson +1 more
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TLDR
In this article, the morphology and grain size of the Ti(C,N) coatings were modified using carbon monoxide (CO), and the results showed that the coatings appeared to be of homogeneous composition even at the highest CO levels.Abstract:
Chemical vapor deposition of Ti(C,N) coatings from the TiCl4–CH3CN–N2–H2 system on cemented carbide substrates was studied. The morphology and grain size of the coatings were modified using carbon monoxide (CO). Transmission electron microscopy confirmed that grain refinement of the Ti(C,N) coatings could be obtained by means of CO doping and nanocrystalline coatings were obtained at CO levels exceeding 6%. CO doping resulted in the incorporation of oxygen in the structure, but no segregation of oxygen to grain boundaries was observed. The coatings appeared to be of homogeneous composition even at the highest CO levels. Both improved coating hardness and surface quality were obtained with decreasing grain size. However, the coatings exhibited clearly lower crater wear resistance in the nanograined region. This was explained by an increased tendency for grain-boundary sliding in the nanocrystalline coatings leading to more pronounced plastic deformation.read more
Citations
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Journal ArticleDOI
The effect of deposition temperature on microstructure and properties of thermal CVD TiN coatings
TL;DR: In this paper, it is shown that the coating hardness changes with the texture, where highly (2 1 1/1) oriented films exhibit a lower hardness compared to non-textured coatings.
Journal ArticleDOI
CO addition in low-pressure chemical vapour deposition of medium-temperature TiCxN1-x based hard coatings
Christoph Czettl,Christian Mitterer,Uwe Mühle,David Rafaja,S. Puchner,Herbert Hutter,M. Penoy,C. Michotte,Martin Kathrein +8 more
TL;DR: In this paper, five different TiCxN1-x coatings were grown by medium-temperature CVD with increasing CO fractions in the TiCl4-CH3CN-H2-N2-CO feed gas using an industrial-scale low-pressure CVD system.
Patent
Layer with controlled grain size and morphology for enhanced wear resistance
TL;DR: In this paper, the preferred grain size should be in the sub-micron region with the grain width of 30 to 300 nm and the length to width ratio should be more than 5, preferably more than 10 and the coating should exhibit a strong preferred growth orientation along 422 or 331.
Journal ArticleDOI
Improvement of mechanical properties and cutting performance of modified MT-TiCxN1 − x coating by moderate temperature chemical vapor deposition
TL;DR: In this article, a modified MT-TiCxN1−−x coating was developed by introducing C2H4 gas to a TiCl4-CH3CN-H2 precursor system on a TiN base layer during moderate temperature low pressure CVD.
Book ChapterDOI
1.16 – Coating Applications for Cutting Tools
TL;DR: The history of chemical vapor deposition and physical vapor deposition (PVD) can be found in this paper, where the authors address the history of CVD and PVD coatings, their technological aspects, coating architectures, and finally their range of application and why in some regions one technology dominates and in others both are competitive.
References
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Journal ArticleDOI
An improved technique for determining hardness and elastic modulus using load and displacement sensing indentation experiments
Warren C. Oliver,George M. Pharr +1 more
TL;DR: In this paper, the authors used a Berkovich indenter to determine hardness and elastic modulus from indentation load-displacement data, and showed that the curve of the curve is not linear, even in the initial stages of the unloading process.
Journal ArticleDOI
Softening of nanocrystalline metals at very small grain sizes
TL;DR: In this paper, the deformation of nanocrystalline copper has been studied and it is shown that the hardness and yield stress of the material typically increase with decreasing grain size, a phenomenon known as the reverse Hall-Petch effect.
Journal ArticleDOI
The search for novel, superhard materials
TL;DR: The recent development in the field of superhard materials with Vickers hardness of ⩾40 GPa is reviewed in this article, where two basic approaches are outlined including the intrinsic superhard material, such as diamond, cubic boron nitride, C3N4, carbonitrides, etc. and extrinsic, nanostructured materials for which superhardness is achieved by an appropriate design of their microstructure.
Journal ArticleDOI
On the validity of the hall-petch relationship in nanocrystalline materials
TL;DR: In this paper, a study experimentale de la variation de la durete en fonction de la grosseur de grain for des materiaux nanocristallins is presented.
Journal ArticleDOI
K-shell ionization cross-sections for use in microanalysis
TL;DR: In this paper, a hydrogenic model with Zener screening constant is used to calculate generalized oscillator strengths of K-shell ionization, the optical values showing good agreement with X-ray absorption data.