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Dissertations / Theses on the topic 'Hard coating'

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Published: 4 June 2021
Last updated: 29 May 2022

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1

Beresnev, V. M., O. V. Sobol’, Олександр Дмитрович Погребняк, et al. "About Peculiarities of the Influence of the Negative Bias Potential Applied to the Substrate During the Deposition Process on the Structural State and Properties of the Multilayer system MoN-CrN." Thesis, Sumy State University, 2015. http://essuir.sumdu.edu.ua/handle/123456789/42799.

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Applying transition metal nitrides of Mo and Cr, which are characterized by a relatively low heat of formation, as the components of the multilayer coating, the possibilities of elemental and structural engineering of vacuum-arc coatings under the influence of the bias potential Us and the reaction gas pressure PN are revealed. It was found that at a relatively small thickness of the layers of nanometer range, which provides superhard state of the coatings, the supply of Us with the value of above the critical leads to a drop in hardness, which can be explained by mixing of layers at the inter
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2

Lind, Hans. "Theoretical understanding of stability of alloys for hard-coating applications and design." Doctoral thesis, Linköpings universitet, Teoretisk Fysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-115405.

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The performance of modern hard coating materials puts high demands on properties such as hardness, thermal stability and oxidation resistance. These properties not only depend on the chemical composition, but also on the structure of the material on a nanoscale. This kind of nanostructuring will change during use and can be both beneficial and detrimental as materials grown under non-equilibrium conditions transforms under heat treatment or pressure into other structures with significantly different properties. This thesis aims to reveal the physics behind the processes of phase stability and
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3

Donohue, Lee Adrian. "Deposition and characterisation of (Ti,Zr) based hard compound and multi-layer PVD films." Thesis, Sheffield Hallam University, 1995. http://shura.shu.ac.uk/19570/.

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Industrial recognition of the importance of optimising engineering component performance has recently led to a significant increase in the use of surface coating technologies. An important process for the production of such coatings is Physical Vapour Deposition (PVD) which has proved to be a consistent, reliable and improving technique for industry. In the area of advanced wear resistant coatings however, fundamental research to improve deposition efficiency and enhance coating performance has been required. This thesis describes research investigating the following three areas: A series of e
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4

Brunell, Ian. "A fundamental study of nanocomposite hard coatings formed by ion-assisted deposition." Thesis, University of Salford, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.300761.

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5

Khetan, Vishal. "High temperature oxidation and wear properties of magnetron sputtered AlTiTaN based hard coatings." Doctoral thesis, Universite Libre de Bruxelles, 2016. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/225493.

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Hard nanostructured TiAlN coatings have gained high importance in the field of protective tribological coatings. Nevertheless, their use regarding high temperature (>800°C) applications such as dry high speed machining still remains a challenge. Addition of elements such as Ta or Y has shown a beneficial impact on these properties. But for a better performance of these coatings, an in-depth understanding of their oxidation and wear mechanisms over a wider range of temperatures is needed which is currently unavailable in the literature. This work investigated the wear and oxidation properties o
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6

Bojestig, Eric. "Adhesion of CVD coatings on new cemeted carbides." Thesis, Uppsala universitet, Tillämpad materialvetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-298648.

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Steel turning inserts cemented carbides have a binder phase consisting of cobalt (Co). However, in recent years a study from the United States National Toxicity Program (NTP) found that cobalt powder is carcinogenic upon inhalation. The European Union's REACH have therefore also classified cobalt powder as carcinogenic upon inhalation. The worldwide search to find a replacement has therefore lately intensified. It is important that the alternative binder phase has no negative effects on the properties of the insert. In this thesis the adhesion between a multilayer ceramic chemical vapor deposi
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7

Karlsson, Marjam. "Nano-porous Alumina, a Potential Bone Implant Coating." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4452.

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8

SUZUKI, Kenji, Keisuke TANAKA, and Yoshiaki AKINIWA. "Estimation of Spalling Stress in Thermal Barrier Coatings Using Hard Synchrotron X-Rays." The Japan Society of Mechanical Engineers, 2004. http://hdl.handle.net/2237/9176.

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9

Dilner, David. "Behavior of cutting tool coating material Ti1-xAlxN at high pressure and high temperature." Thesis, Linköpings universitet, Institutionen för fysik, kemi och biologi, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-52773.

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The high pressure and high temperature (HPHT) behavior of Ti1-xAlxN coatings on cutting tool inserts have been of interest for this diploma work. A literature study of HPHT techniques as well as measurement methods has been done. A diamond anvil cell (DAC) would be a good device to achieve high pressure and high temperature conditions on small samples. Another way to obtain these conditions would be a cutting test, which has been performed on a Ti1-xAlxN coated cutting tool insert with x = 0.67. Also a cubic press could be used to apply HPHT on a     Ti1-xAlxN sample or a large volume press on
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10

Дядюра, Костянтин Олександрович, Константин Александрович Дядюра, Kostiantyn Oleksandrovych Diadiura та М. В. Воскобойник. "Вакуумно-дугове модифікування поверхні різальних інструментів". Thesis, Сумський державний університет, 2017. http://essuir.sumdu.edu.ua/handle/123456789/62392.

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Підвищення ресурсу металорізальних інструментів і штампів, що працюють в умовах високих навантажень та підвищеного зношування досягається цілим рядом властивостей покриттів, які безпосередньо контактують з оброблюваним матеріалом. Це виявляється в підвищенні продуктивності, зниженні загальних витрат на різальний інструмент, підвищенні якості обробки, можливості відмови від застосування ЗОТС тощо, тому що покриття мають не тільки високу зносостійкість, але й низьку теплопровідність, тобто можуть виступати своєрідним тепловим бар'єром.
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11

Хижняк, В. Г., Андрій Іванович Дегула, Андрей Иванович Дегула та ін. "Електронна будова та властивості дифузійних карбідних покриттів Ti, V, Cr". Thesis, Сумський державний університет, 2016. http://essuir.sumdu.edu.ua/handle/123456789/47994.

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При вирішенні проблем підвищення надійності та довговічності пристроїв, оснастки, інструментів, велике значення мають пошук та розробка нових захисних покриттів [1-3]. Це дозволить підвищити термін служби виробів та продуктивність праці.
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12

Dilner, David. "Behavior of cutting tool coating material Ti1-xAlxN at high pressure and high temperature." Thesis, Linköping University, Department of Physics, Chemistry and Biology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-52773.

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<p>The high pressure and high temperature (HPHT) behavior of Ti<sub>1-x</sub>Al<sub>x</sub>N coatings on cutting tool inserts have been of interest for this diploma work. A literature study of HPHT techniques as well as measurement methods has been done. A diamond anvil cell (DAC) would be a good device to achieve high pressure and high temperature conditions on small samples. Another way to obtain these conditions would be a cutting test, which has been performed on a Ti<sub>1-x</sub>Al<sub>x</sub>N coated cutting tool insert with x = 0.67. Also a cubic press could be used to apply HPHT on a 
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13

Auregan, Gilles. "Tribologie des contacts dans les vis à rouleaux satellites." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEC002.

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Les vis à rouleaux satellites (VAR) équipent certains actionneurs électromécaniques du secteur aéronautique, et permettent de transformer un mouvement de rotation en un mouvement de translation. Ces systèmes sont constitués d’aciers inoxydables martensitiques trempés, et sont habituellement lubrifiés à la graisse. Comme pour beaucoup d’autres pièces de roulement, l’adhésion-grippage peut survenir bien avant la durée de vie théorique calculée en fatigue de roulement. La charge actionnée par la vis est portée par un ensemble de contacts entre les filets de la vis, des rouleaux et de l’écrou. Cha
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14

Karlsson, Patrik. "Tribological characterization of selected hard coatings." Thesis, Karlstad University, Faculty of Technology and Science, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-4219.

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<p>Hard coatings are often used for protection of tool surfaces due to coating properties like low friction and high wear resistance. Even though many of the hard coatings have been tested for wear, it is important to try new wear test setups to fully understand tribological mechanisms and the potential of hard coatings. Few experiments have been performed with dual-coated systems where the sliding contact surfaces are coated with the same, or different, hard coating. The dual-coated system could be the solution to many new technical devices and perhaps a further improvement of conventional co
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15

Forsén, Rikard. "Multicomponent Alloying for Improved Hard Coatings." Doctoral thesis, Linköpings universitet, Nanostrukturerade material, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-110684.

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Coatings are vital to protect and to increase the productivity of cutting tools in high speed and dry cutting applications. During the cutting operation the temperature may exceed 1000 ºC it is therefore necessary that the coatings withstand high temperatures. A lot of development and research has been carried out during the last 30 years on finding new coating material systems providing enhanced properties such as adhesion, hardness and oxidation resistance at elevated temperatures. This thesis is based on multicomponent alloying of quaternary transition metal nitride hard coatings with a mai
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16

Musil, J. "Recent progress in hard nanocomposite coatings." Thesis, Видавництво СумДУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/20599.

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17

Pontin, Gabriel Inácio [UNESP]. "Microestrutura do metal de solda GTAW reforçado com carbonetos de titânio, parcialmente refundido por laser Nd:YAG pulsado." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/151338.

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Submitted by GABRIEL INÁCIO PONTIN null (gabrielguaira@hotmail.com) on 2017-08-15T18:00:10Z No. of bitstreams: 1 Dissertação Final - Gabriel Inacio Pontin.pdf: 2725651 bytes, checksum: f1433687bb33e3c16dd042c87cb686db (MD5)<br>Approved for entry into archive by Monique Sasaki (sayumi_sasaki@hotmail.com) on 2017-08-22T17:44:39Z (GMT) No. of bitstreams: 1 pontin_gi_me_ilha.pdf: 2725651 bytes, checksum: f1433687bb33e3c16dd042c87cb686db (MD5)<br>Made available in DSpace on 2017-08-22T17:44:39Z (GMT). No. of bitstreams: 1 pontin_gi_me_ilha.pdf: 2725651 bytes, checksum: f1433687bb33e3c16dd042c87
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Pontin, Gabriel Inácio. "Microestrutura do metal de solda GTAW reforçado com carbonetos de titânio, parcialmente refundido por laser Nd:YAG pulsado /." Ilha Solteira, 2017. http://hdl.handle.net/11449/151338.

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Orientador: Juno Gallego<br>Resumo: O desgaste abrasivo é uma das causas de falhas em equipamentos e responsável por prejuízos nos processos industriais. Uma técnica capaz de minimizar os efeitos deste fenômeno é a aplicação de revestimentos duros nas superfícies críticas. Recentemente foram desenvolvidos revestimentos contendo carbonetos de titânio formados pela fusão de misturas contendo cavacos das ligas ASTM F67 e ASTM F136 sobre peças de aço-carbono ASTM A-36. Após a aplicação do processo de soldagem GTAW obteve-se significativa fração volumétrica de TiC grosseiro com elevada dureza. No p
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19

Werninghaus, Thomas. "Micro-Raman Spectroskopy Investigation of Hard Coatings." Doctoral thesis, Universitätsbibliothek Chemnitz, 1999. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-199900407.

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Abstract: Micro­Raman Spectroscopy Investigation of Hard Coatings Diamond, silicon carbide, and boron nitride have attracted great interest in the last years, due to their excellent material properties. Especially the extreme hardness and the high thermal con­ ductivity of these materials favour them as protective layers. The very large hardness gave these materials, deposited as films on various substrates, their name: hard coatings. In contrast to di­ amond, silicon carbide and boron nitride can be n­ as well as p­doped, making them promising candidates for high speed and high tempera
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20

Pélisson, Aude. "Al-Si-N transparent hard nanostructured coatings /." [S.l.] : [s.n.], 2009. http://edoc.unibas.ch/diss/DissB_8830.

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21

Elliott, David Mark. "Deformation of hard coatings on softer substrates." Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386111.

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22

Werninghaus, Thomas. "Micro-Raman Spectroskopy Investigation of Hard Coatings." Doctoral thesis, Verlag: Als Manuskript gedruckt im SHAKER Verlag Aachen;ISBN 3-8265-3110-8, 1997. https://monarch.qucosa.de/id/qucosa%3A17562.

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Abstract: Micro­Raman Spectroscopy Investigation of Hard Coatings Diamond, silicon carbide, and boron nitride have attracted great interest in the last years, due to their excellent material properties. Especially the extreme hardness and the high thermal con­ ductivity of these materials favour them as protective layers. The very large hardness gave these materials, deposited as films on various substrates, their name: hard coatings. In contrast to di­ amond, silicon carbide and boron nitride can be n­ as well as p­doped, making them promising candidates for high speed and high tempera
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23

Chen, Yu-Hsiang. "Mechanical and thermal stability of hard nitride coatings." Doctoral thesis, Universitat Politècnica de Catalunya, 2018. http://hdl.handle.net/10803/665071.

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Hard coating 's thermal stability is essential due to the high temperature environment of high-speed cutting applications, while the induced phase and microstructure evolution affects the mechanical properties. In this thesis, the mechanical stability of arc-evaporated hard nitride coatings annealed at high temperature is analyzed and connected to the phase evolution. In addition to hardness, fracture toughness is evaluated by surface and cross-sectional investigations by scanning/transmission electron microscopy of damage events by mechanical tests. The crack resistance of Ti1-xAixN with a r
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24

Allsopp, D. N. "Abrasive wear of bulk materials and hard coatings." Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.595477.

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Thin coatings and other surface engineering techniques are widely used to improve the friction and wear properties of surfaces. However, current understanding of the behaviour of surfaces is relatively poor. Production methods are therefore to a large extent based upon empiricism. Many well-established materials characterisation tests are inadequate, and so novel techniques for the examination of surface layers have emerged, with the eventual aim of predicting the tribological performance of surfaces. One such technique is the micro-scale abrasive wear test, in which a ball is rotated against
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25

Yalamanchili, Phani Kumar. "ZrN based Nanostructured Hard Coatings : Structure-Property Relationship." Licentiate thesis, Linköpings universitet, Nanostrukturerade material, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-106763.

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Ever since the hard coatings have been introduced, there has been a constant push for better mechanical properties, which motivates for deeper understanding of the microstructure-mechanical properties correlation. The aim of this thesis is to extend the knowledge on how microstructural variation influences the deformation, fracture and wear behavior of ZrN based nanostructured coatings. Few microns thick, monolithic Zr-Si-N and multilayered Zr-Al-N coatings were deposited by reactive arc deposition and unbalanced reactive magnetron sputtering techniques respectively. The microstructures of the
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26

Lembke, Mirkka Ingrid. "Oxidation behaviour of TiAlN based nanolayered hard coatings." Thesis, Sheffield Hallam University, 2001. http://shura.shu.ac.uk/19951/.

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The oxidation behaviour of TiAlN based hard coatings with the addition of Cr and/or Y was investigated using scanning electron microscopy, scanning/transmission electron microscopy, energy dispersive X-ray analysis, thermogravimetry and X-ray diffraction. The coatings were deposited using the combined cathodic arc/unbalanced magnetron deposition technique. The main practical application of these films is dry high speed cutting in difficult to cut materials such as AISI A2 steel. Especially in the case of TiAlCrYN coating with an oxynitride and Cr-enriched overcoat, extensive research on the ox
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Liu, Shiyu. "Deformation and fracture of fine-grained CrAISiN hard coatings." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708634.

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28

Tang, Kok Cheong. "Finite element analysis of elastic-plastic coated surfaces under normal indentation by a deformable indenter." Thesis, University of Salford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245060.

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29

Flink, Axel. "Growth and Characterization of Ti-Si-N Hard Coatings." Licentiate thesis, Linköping : Department of Physics, Chemistry and Biology, Linköping University, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-7741.

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30

Werninghaus, Thomas [Verfasser]. "Micro-Raman Spectroskopy Investigation of Hard Coatings / Thomas Werninghaus." Chemnitz : Universitätsbibliothek Chemnitz, 1999. http://d-nb.info/1210932342/34.

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31

Silva, Maria de Fatima Oliveira Vales de. "Multilayer TiB←2/X hard coatings by sputtering deposition." Thesis, Cranfield University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284875.

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32

Constable, Christopher Paul. "Raman microscopic studies of PVD deposited hard ceramic coatings." Thesis, Sheffield Hallam University, 2000. http://shura.shu.ac.uk/19498/.

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PVD hard ceramic coatings grown via the combined cathodic arc/unbalance magnetron deposition process were studied using Raman microscopy. Characteristic spectra from binary, multicomponent, multilayered and superlattice coatings were acquired to gain knowledge of the solid-state physics associated with Raman scattering from polycrystalline PVD coatings and to compile a comprehensive spectral database. Defect-induced first order scattering mechanisms were observed which gave rise to two pronounced groups of bands related to the acoustical (150-300cm[-1]) and optical (400-750cm[-1]) parts of the
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Dyrda, Katia Marjolaine. "Adhesion characterization of hard ceramic coatings by the scratch test." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ37948.pdf.

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34

Zhou, Zhaoxia. "Oxidation and wear of TiAlN/VN multilayer PVD hard coatings." Thesis, University of Sheffield, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.557419.

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TiAlN/VN multilayers, with a layer periodicity of ~3nm, have exhibited superior sliding wear resistance (1.26xlO-17m3N-lm-l) and lower friction coefficient (~=0.4, pin-on-disc test, Ah03 ball counterpart) when compared to other commonly used wear protective coatings, e.g. TiN, TiAlN and TiAlN/CrN. They require excellent oxidation and wear resistance for dry high speed machining operations. This project investigates the microstructure of the as-deposited coatings, their oxidation degradation mechanism and their wear and friction properties at room and elevated temperatures. The microstructure o
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Yang, Shicai. "The structure and control of Ti2N phases produced by unbalanced magnetron sputtering." Thesis, Sheffield Hallam University, 1997. http://shura.shu.ac.uk/20583/.

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Physical vapour deposition (PVD) techniques used for the application of advanced surface engineering materials have been developed over many years, but only in about the last 10 years has the unbalanced magnetron sputtering (UBMS) PVD technique been developed and emerged as one of the most promising techniques for depositing reliable and high quality films used in industrial production. Hard coatings have been studied for many years for the purpose of improving the performance of various tools, mechanical parts, and engineering components. The most studied binary hard coatings (such as stoichi
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Roffey, Paul. "The production and tribology of hard facing coatings for agricultural applications." Thesis, Sheffield Hallam University, 2008. http://shura.shu.ac.uk/7028/.

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This research has been carried out by the author at the Materials and Engineering Research Institute at Sheffield Hallam University in collaboration with Chapmans Agricultural Ltd. Abrasive wear is a significant issue in many industries but is of particular significance in agriculture. This research is being carried out due to the demand for a hard wearing, economical coating for use in the agricultural industry. A primary objective has been to review and develop an in depth understanding of the type of wear suffered by metal shares in agricultural soils. The affect of soil properties and abra
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Norrby, Niklas. "Microstructural evolution of TiAlN hard coatings at elevated pressures and temperatures." Doctoral thesis, Linköpings universitet, Nanostrukturerade material, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-106507.

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A typical hard coating on metal cutting inserts used in for example turning, milling or drilling operations is TiAlN. At elevated temperatures, TiAlN exhibits a well characterized spinodal decomposition into coherent cubic TiN and AlN rich domains, which is followed by a transformation from cubic to hexagonal AlN. Using in-situ synchrotron x-ray radiation, the kinetics of the second transformation was investigated in this thesis and the strong temperature dependence on the transformation rate indicated a diffusion based nucleation and growth mechanism. The results gave additional information r
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McGurk, Martin. "An exploration of contact deformation mechanisms in thin hard coated systems." Thesis, University of Newcastle Upon Tyne, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362520.

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39

El, Azhari Idriss. "Multiscale mechanical and microstrutural characterization of titanium and zirconium carbonitride hard coatings." Doctoral thesis, TDX (Tesis Doctorals en Xarxa), 2020. http://hdl.handle.net/10803/669821.

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The present dissertation is an in-depth investigation from the macro to atomic scale of industrial wear-resistant CVD hard coatings deposited on cemented carbides for cutting tool applications. Micro-compression tests at the micro-scale and contact damage induced by means of millimetric spherical indentation were deployed to study deformation mechanisms of two systems consisting of a defined cemented carbide substrate coated with two different films: Ti(C,N) and Zr(C,N). The latter system exhibited a superior tool life in comparison to the conventional Ti(C,N) one. Several characterization tec
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Dhulipalla, Ajay Krishna. "Effect of surface finish and hard coatings on scuffing of steel discs." Thesis, Cardiff University, 2006. http://orca.cf.ac.uk/56106/.

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The principal purpose of the work described in this thesis was to develop an insight into the scuffing performance of steel discs used to simulate gear tooth contacts under severe conditions of load, sliding and high temperature. Different surface conditions of the discs such as ground, superfinished, ground/hard-coated, and superfinished/ hard-coated were investigated in various combinations and at sliding speeds of up to 16 m/s in order to obtain an understanding of the possible beneficial effect of improved surface finish and the application of hard coatings on scuffing performance under th
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Johnson, Lars. "Inside The Miscibility Gap : Nanostructuring and Phase Transformations in Hard Nitride Coatings." Doctoral thesis, Linköpings universitet, Tunnfilmsfysik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-84263.

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This thesis is concerned with self-organization phenomena in hard and wear resistant transition-metal nitride coatings, both during growth and during post deposition thermal annealing. The uniting physical principle in the studied systems is the immiscibility of their constituent parts, which leads, under certain conditions, to structural variations on the nanoscale. The study of such structures is challenging, and during this work atom probe tomography (apt) was developed as a viable tool for their study. Ti0.33Al0.67N was observed to undergo spinodal decomposition upon annealing to 900 °C, b
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42

Lin, Haisheng. "The simulation and design of hard coatings for high speed cutting tool." Thesis, Nantes, 2019. http://www.theses.fr/2019NANT4087.

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Les alliages de titane ont été largement utilisés dans les domaines de l'aéronautique, de l'automobile, et al. en raison de ses excellentes propriétés physiques et chimiques. Cependant, ce sont aussi des matériaux difficiles à couper en raison de leur résistance élevée, de leur faible conductivité thermique, de leur grande réactivité chimique, etc. L'usure rapide des outils lors de l'usinage à grande vitesse des alliages de titane entraîne une faible efficacité de production et un coût élevé. L’objectif de cette thèse est de développer le revêtement d’outil en carbure cémenté spécifique à l’us
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Walock, Michael. "Nanocomposite coatings based on quaternary metalnitrogen." Phd thesis, Paris, ENSAM, 2012. http://pastel.archives-ouvertes.fr/pastel-00843104.

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Lors de ce projet, des revêtements de CrN-WC ont été étudiés en temps que matériaux hybrides durs et résistants. L'association d'un carbure et d'un nitrure résistants bien à la corrosion et obtenus dans des conditions optimales de dépôt permettra d'avoir des matériaux de protection contre l'usure, la corrosion mais aussi des dépôts servant de couches tampon à du diamant nanocristallin dont l'adhérence est mauvaise. Tout d'abord nous avons déterminé la faisabilité du système de CrN-WC et son utilisation comme couche intermédiaire pour du diamant nanocristallin. En faisant varier les paramètres
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Dingremont, Norbert. "Analyse de la compatibilité des traitements de nitruration par voie ionique avec les dépôts par plaquage ionique : application à l'acier de construction 35NCD16 et à l'acier d'outillage pour travail à chaud Z38CDV5." Vandoeuvre-les-Nancy, INPL, 1996. http://www.theses.fr/1996INPL110N.

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Afin de déterminer dans quelle mesure les traitements de nitruration par voie ionique peuvent être compatibles aves les dépôts par plaquage ionique, nous avons analysé l'influence de la procédure de dépôt sur la stabilité des couches nitrurées. Ce travail a permis de montrer que le cycle thermique associé à la procédure de dépôt peut conduire à lui seul à la déstabilisation des couches de combinaison et seulement celles-ci. Dans ce cas, la stabilité thermique intrinsèque des couches de combinaison est mise en cause. Nous avons également mis en évidence la déstabilisation de ces mêmes couches l
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Nováková, Radana. "Povlakování střižných nástrojů ze slinutých karbidů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231749.

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Tato diplomová práce se zabývá problematikou PVD povlakování střižných nástrojů ze slinutých karbidů, se zaměřením na zvýšení životnosti postupových nástrojů. Především poukazuje na využití povlakovaných nástrojů v praxi a procesních kroků před a po procesu povlakování. V teoretické části jsou popsány obě základní metody povlakování, tj. fyzikální metoda PVD a metoda CVD, založena na chemickém procesu. Dále jsou představeny jednotlivé způsoby vlastních procesů povlakování se stručným popisem výhod i nevýhod jejich využití. Praktická část je zaměřena na testování, jehož podstatou byl nejen vhod
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Eriksson, Mats. "Sliding wear performance of electroplated hard chromium and autocatalytic nickel-phosphorus coatings at elevated temperatures." Thesis, Karlstads universitet, Avdelningen för maskin- och materialteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-34870.

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This thesis was written for a Swedish valve manufacturer to find out in what temperature regimes it was possible to replace electroplated hard chromium with autocatalytic electroless nickel-phosphorus. In this work the dry sliding wear properties of electroplated hard chromium and autocatalytic electroless nickel-phosphorus(10% P) were compared. All tests and investigations were done by using available equipment at Karlstads University. The tests were made to find out how the wear of these coatings behaved at different temperatures, how different substrates influence the wear of these coatings
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Yalamanchili, Phani Kumar. "Multiscale materials design of hard coatings for improved fracture resistance and thermal stability." Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/457422.

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Physical vapor deposited hard coatings comprised of cubic (c) transition metal (TM)-Al-N, and (TM)-Si-N are the current work horse materials for a large number of metal cutting and wear resistant applicatíons to light against the extreme conditions of temperature and stress simultaneously. In spite of a high degree of sophisticatíon in terms of material choice and microstructural design, a lower fracture resistance and limited thermal stability of the coatings remains a technological challenge in the field. The lower fracture resistance ofthe coating is an inherent material property. Limited
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Zhang, Li Ying Grace. "Fatigue and integrity of hard ceramics and coatings using the soft impressor technique." Thesis, University of Hull, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363272.

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Huang, Kuo-Long, and 黃國隆. "The research of superlattice structural hard coating." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/58269383047163721900.

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碩士<br>國立中央大學<br>光電科學研究所<br>94<br>In recent years, demand of optical lens increased day by day. For quantity producing and products quality, the molding technology is being paid attention to. And consider for lower costs, the hard coating technology is more and more important. But how to coat hard film that had high molding times, it is that we want study. The general hard coating technology, according to material different, can divide into three kinds, diamond like carbon, nitride and noble metal hard films. Consider for fabrication and material, the noble metal is the general material o
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Wang, An-ni, and 王安妮. "Fracture Toughness Measurement on TiN Hard Coating." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/60307793101410005548.

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碩士<br>國立清華大學<br>工程與系統科學系<br>100<br>In last two decades, extensive studies have been dedicated in establishing a standard method on toughness measurement for thin film materials. However, there has no standard methodology or test procedure up to now. Stress based or energy based methods have been proposed on this subject, where the externally applying stress is usually required, and therefore special substrate geometry is designed, or micro-scaled strain gauge or atomically sharp cracks need to be fabricated. In addition, the stress distribution in the specimen should be monitored during the me
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