Bibliographies thématiques / TiAlN coating

Littérature scientifique sur le sujet « TiAlN coating »

Auteur : Grafiati
Publié le 14 mars 2023

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Articles de revues sur le sujet "TiAlN coating"

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Wang, Xuan, Kui Zhang, Guang Hui Yue, Dong Liang Peng, Zheng Bing Qi et Zhou Cheng Wang. « Investigation on the Structure and Properties of TiAlN Coatings Deposited by DC Reactive Magnetron Sputtering ». Advanced Materials Research 154-155 (octobre 2010) : 1639–42. http://dx.doi.org/10.4028/www.scientific.net/amr.154-155.1639.

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TiAlN coatings have been deposited by reactive magnetron sputtering from TiAl alloy target using a direct current (DC) power source. The crystal structure, chemical composition, surface morphology and hardness of TiAlN coatings which were prepared at various N2 flow rates have been systemically investigated. The results show a strong effect of N2 flow rates on the orientation, grain size and densification in TiAlN coatings. The TiAlN coating shows the highest hardness at a certain N2 flow rate when it has the most compact structure.
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Chang, Yin Yu, Da Yung Wang et Chi Yung Hung. « Mechanical Properties of TiAlN/CrN Nanolayered Coatings Synthesized by a Cathodic-Arc Deposition Process ». Solid State Phenomena 118 (décembre 2006) : 323–27. http://dx.doi.org/10.4028/www.scientific.net/ssp.118.323.

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TiAlN, and TiAlN/CrN nanolayered coatings were synthesized by cathodic-arc evaporation with plasma enhanced duct equipment. Chromium and TiAl (50/50 at %) alloy cathodes were used for the deposition of TiAlN/CrN coatings. The effects of bilayer thickness and chromium content on the microstructure and mechanical properties of TiAlN/CrN nanolayered coatings were studied. The preferred orientation was changed from (200) in TiAlN monolayered coatings to (111) plane in the multilayered TiAlN/CrN coatings. The multilayered TiAlN/CrN coating with periodic thickness of 20 nm and the smallest crystallite size of 28 nm exhibited the highest hardness of 39 GPa. The multilayered TiAlN/CrN coatings also showed the best adhesion strength using scratch tests. It has been found that the structural and mechanical properties of the films were correlated with the addition of chromium and nanolayer thickness.
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Grewal, Jasmaninder Singh, Buta Singh Sidhu et Satya Prakash. « Characterization of Nanostructured and Conventional TiAlN Coatings Deposited on AISI-304 Boiler Steel ». Advanced Materials Research 1137 (juin 2016) : 1–14. http://dx.doi.org/10.4028/www.scientific.net/amr.1137.1.

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In the manuscript conventional and nanostructured nitrided coatings developed to increase hardness and to improve the wear, erosion and corrosion resistance of structural materials. Three coatings of TiAlN were deposited on AISI-304, out of which two were thin nanocoatings at different temperatures of 500°C and 200°C are developed by Oerlikon Balzer’s rapid coating system machine under a reactive nitrogen atmosphere. One conventional coating TiAl was deposited by Plasma spraying method which was post nitrided. Then the coated samples were characterized with relative to coating thickness, microhardness, porosity and structure. The XRD and SEM/EDAX techniques have been used to identify various phases formed after coating on the surface of steel.The microhardness of conventional TiAlN coating was found to be of the order of 900-950 Hv. The grain size for nanostructured TiAlN coatings deposited at 500°C and 200°C are 15nm and 14nm respectively as calculated by Sherrer’s formula from XRD plot.
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Chang, Chi Lung, Jui Yun Jao, Wei Yu Ho et Da Yung Wang. « Characteristics of TiAl-Doped DLC/TiAlN/TiN Multilayered Coatings Synthesized by Cathodic Arc Evaporation ». Solid State Phenomena 118 (décembre 2006) : 247–56. http://dx.doi.org/10.4028/www.scientific.net/ssp.118.247.

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The combinations of TiAl-doped DLC and TiAlN/TiN layers were designed to deposit on the tool steels using cathodic arc evaporation in a continuously single batch process. The economic advantage in depositing the combined coating in one production scale of PVD system is of practical importance. The TiAl-doped DLC as lubricant coatings were synthesized by using arc plasma sources mounted with Ti50Al50-target to emit high energy ion plasma to activate the decomposition of acetylene reactive gases. The results show that the TiAl-doped DLC and TiAlN/TiN combined coatings retained lower friction coefficient at approximately 0.15 during the steady-state sliding. The lubricity and wear resistance of TiAl-doped DLC/TiAlN/TiN coatings is then demonstrated to potentially be applied to the cutting tools with no lubricants.
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Novotný, Jan, Iryna Hren, Štefan Michna et Stanislaw Legutko. « Analysis of Composite Coating of Deep Drawing Tool ». Coatings 12, no 6 (18 juin 2022) : 863. http://dx.doi.org/10.3390/coatings12060863.

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Modern coating methods have become an important part of industrial practice. For some materials and operations, the use of abrasion-resistant and hard coatings is an absolute necessity; for others, they are the key to greater efficiency and productivity. The aim of this work was to apply and subsequently analyze a new type of thin coating micro-layers TiAlN and TiAlCN, applied using HIPIMS coating technology from a physical point of view. In particular, chemical composition (EDS) and microstructure analyses were carried out in the area of applied coatings. Prepared cross-sectional metallographic samples were evaluated using electron microscopy. A detailed microstructural characterization of the individual elements was carried out on the lamellae of the investigated sample using transmission electron microscopy. It was found that this new multilayer micro-coating based on TiAlN + TiAlCN at a thickness of 5.8 µm increases the repeatability of production strokes by 200%. This finding was confirmed by testing the production of cartridges in the real operation of a large manufacturing company.
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Tomasz, Dudziak, Alasdair Wilson, Haifa G. Ahmad et Psantu K. Datta. « Studies of the Effectiveness of Certain High Performance Coatings in Preventing Hot Corrosion Degradation of Ti-Aluminide Alloys ». Defect and Diffusion Forum 289-292 (avril 2009) : 437–45. http://dx.doi.org/10.4028/www.scientific.net/ddf.289-292.437.

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This paper originates from a large EU programme designed to produce high performance coatings with superior mechanical and corrosion resistance properties to enhance high temperature corrosion behaviour of TiAl based alloy (Ti45Al8Nb).The paper here is concerned with studies of the hot corrosion behaviour of Ti – Aluminide alloys (Ti45Al8Nb mainly -TiAl with small amount 2 (Ti3Al)) coated with three coatings: (1) TiAlYN/CrN coating, (2) CrAl with 2%YN addition [1,2] (3) TiAlN with Al2O3 overlayer. Hot corrosion was induced by spraying salts mixture of 80%Na2SO4/20%NaCl with melting point around 700oC [1] [2] on heated sample surfaces, and subsequently heating the sprayed samples in a furnace at 750oC for various times. The extent of degradation, assessed by weight changes and examination by OM (Optical Microscope), SEM (Scanning Electron Microscope), and EDX (Energy Dispersive X-Ray Analysis) indicated that all samples suffered hot corrosion attack to various degrees. TiAlN with Al2O3 overlayer had the best corrosion resistance.We shall discuss these results within a mechanistic framework of hot corrosion degradation and describe their implications.
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Lee, Sang Yong, et Sang Yul Lee. « Application of PVD Coatings for Improvement of Die Performance in Copper Semi-Solid Processing ». Solid State Phenomena 116-117 (octobre 2006) : 84–87. http://dx.doi.org/10.4028/www.scientific.net/ssp.116-117.84.

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TiAlN/CrN multilayer coatings with an superlattice period of 6.1nm was applied to a proto-type high temperature segment mold for Cu semi-solid processing so that it was investigated the possibilities of TiAlN/CrN multilayer coating as a candidate protective coatings to extend the lifetime of high temperature molds and dies. Much improved performance was obtained from the TiAlN/CrN coated molds, although different behaviors were observed depending upon the type of substrate mold materials. . Improvement of mold performance was observed by TiAlN/CrN coating on AISI H13 steel, but TZM alloy with TiAlN/CrN coating was found to be the best candidate as a mold for high temperature Cu semi-solid processing.
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Grenadyorov, Alexander, Vladimir Oskirko, Alexander Zakharov, Konstantin Oskomov, Sergey Rabotkin, Vyacheslav Semenov, Andrey Solovyev et Alexander Shmakov. « Properties of TiAlN Coatings Obtained by Dual-HiPIMS with Short Pulses ». Materials 16, no 4 (5 février 2023) : 1348. http://dx.doi.org/10.3390/ma16041348.

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The paper focuses on the dual high-power impulse magnetron sputtering of TiAlN coatings using short pulses of high power delivered to the target. The surface morphology, elemental composition, phase composition, hardness, wear resistance, and adhesive strength of TiAlN coatings with different Al contents were investigated on WC–Co substrates. The heat resistance of the TiAlN coating was determined with synchrotron X-ray diffraction. The hardness of the TiAlN coating with a low Al content ranged from 17 to 30 GPa, and its wear rate varied between 1.8∙10−6 and 4.9∙10−6 mm3·N−1·m−1 depending on the substrate bias voltage. The HF1–HF2 adhesion strength of the TiAlN coatings was evaluated with the Daimler–Benz Rockwell C test. The hardness and wear rate of the Ti0.61Al0.39N coating were 26.5 GPa and 5.2∙10−6 mm3·N−1·m−1, respectively. The annealing process at 700 °C considerably worsened the mechanical properties of the Ti0.94Al0.06N coating, in contrast to the Ti0.61Al0.39N coating, which manifested a high oxidation resistance at annealing temperatures of 940–950 °C.
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Shen, Li, Jiang Zhao, Yu-Qing Zhang et Guo-Zheng Quan. « Performance evaluation of titanium-based metal nitride coatings and die lifetime prediction in a cold extrusion process ». High Temperature Materials and Processes 40, no 1 (1 janvier 2021) : 108–20. http://dx.doi.org/10.1515/htmp-2021-0019.

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Abstract Surface coating can greatly enhance the lifetime of cold extrusion die. It is a significant issue to evaluate the performance of coatings and even predict the lifetime of cold extrusion die. In this work, the titanium-based nitride coatings including TiN, TiAlN, and TiAlCrN were, respectively, deposited on the surface of high-speed steel substrate W6Mo5Cr4V2 (M2) by the physical vapor deposition technology. The hardness test, scratch test, Rockwell adhesion test, and pin-on-disc (POD) wear test were carried out aiming to investigate the performances of the three coatings including hardness, adhesion strength, and wear resistance. The results show that the TiAlCrN coating exhibits the highest hardness of 3,033 HV in comparison with TiN coating (1,222 HV) and TiAlN coating (1,916 HV), while it possesses poor adhesion strength and inferior wear resistance. Furthermore, the TiAlN coating presents the highest resistance to wear and spalling from the substrate. In addition, the Archard wear model of the coatings was solved and applied in the finite element model of cold extrusion to calculate the wear depth and lifetime of the cold extrusion dies. The results suggest that TiAlN coating is the optimal option for cold extrusion die as compared with TiAlCrN and TiN coatings. TiAlN coating can prolong the lifetime of the substrate die up to 260%.
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KARA, LEVENT, HOJJAT GAHRAMANZADE ASL et ÖZCAN KARADAYI. « THE EFFECT OF TiN, TiAlN, CrAlN, AND TiAlN/TiSiN COATINGS ON THE WEAR PROPERTIES OF AISI H13 STEEL AT ROOM TEMPERATURE ». Surface Review and Letters 26, no 09 (17 octobre 2019) : 1950063. http://dx.doi.org/10.1142/s0218625x1950063x.

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TiN, TiAlN, CrAlN and TiAlN/TiSiN films were deposited on AISI H13 hot work steel substrate by cathodic arc evaporation method. Each coating was optimized in laboratory conditions and the highest hardness and wear resistance coatings were taken into consideration for this study. Morphological properties, chemical compositions, crystallographic structure, nano hardness and adhesion strength of coatings were analyzed with SEM, AFM, EDS, XRD, nano indentation and scratch resistance tester. Wear experiments were performed using ball-on-disk tribometer against Al2O3 ball of 6[Formula: see text]mm diameter and wear volume of coatings were measured using optical profilometer. Wear experimental results revealed that all coated samples showed higher wear resistance and hardness than uncoated AISI H13 steel substrate. The highest wear and scratch resistances as well as nano hardness were attained for CrAlN coating. TiAlN coating has the lowest scratch resistance and wear resistance. Adhesive wear mechanism was the dominant wear mechanism for CrAlN coatings which is the highest wear resistant coating. Abrasive wear mechanism was the dominant wear mechanism for TiAlN coatings which is the lowest wear resistant coating.
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Thèses sur le sujet "TiAlN coating"

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Landälv, Ludvig. « Samband mellan tjockleken hos PVD-skikt och förslitningsbeteendet vid svarvning ». Thesis, Luleå Tekniska Universitet, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-127729.

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This project has as main goal to study the influence of the coating thickness, deposited by arc-PVD- technology, on the wear resistance of coated cemented carbide inserts in three different turning operations. An additional effort has also been made to develop a new test method for evaluating flank wear resistance. Three different coating types (Coating A, Coating B and Coating C) have been studied in three distinctive thicknesses (2, 4 and 6 μ m) for each type. For two of the coating types (Coating A and B) special studies has been done with the thickest coating, creating two additional coating versions of the thickest coating, by changing various deposition parameters, with the aim to enhance the cohesive properties of the coating and lower the residual stresses at the cutting edge. The results show increased crater wear resistance with increased coating thickness for all coating types, but the amount of increase changes with coating type (Coating A>B>C). Flaking wear resistance decreased with increased coating thickness for all coating types. Further the high temperature version of Coating A, showed a significant increase in the flaking wear resistance compared to the standard version of Coating A. The flank wear test showed an increased resistance with thicker coatings in all cases except for the 6 μ m version of Coating C. The flank wear resistance of the most flank wear resistant coatings (Coating B, C) was also successfully examined in a new developed test method. The method suppressed excessive crater wear on the rake face and presented a high abrasive wear rate on the flank and some flaking on the rake face. The amount of flaking is judged not to influence the testing of the flank wear resistance. For all the tested coatings in the new test an increase in the coating thickness resulted in better flank wear resistance.
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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 of AlTiTaN hard coatings deposited by reactive magnetron sputtering at a substrate temperature of 250°C. Depending on process conditions, coatings with a preferential crystallographic orientation of cubic {111} or {200} with a columnar microstructure were observed. The oxidation and wear mechanisms for these coatings were investigated between 700°C and 950°C in air for various test durations. Further, the influence of Y doping in AlTiTaN coating was also studied.By combining Dynamic-Secondary Ion Mass Spectrometry ,X-ray diffraction (XRD) and Transmission Electron Microscopy measurements, it was demonstrated that a single amorphous oxide layer comprising of Ti, Al and Ta oxides formed at 700°C became a bilayer composed of a crystalline Al rich layer (protective Al2O3) and a Ti/Ta rich oxide layer at 900°C. The oxidation mechanism was governed primarily by inward diffusion of O at 700°C while from 800°C onwards outward diffusion of Al and inward diffusion of O controlled the reaction rate. A correlation between the oxidation kinetics and wear mechanism of AlTiTaN coatings, investigated at 700°, 800° and 900°C, was established.
Doctorat en Sciences de l'ingénieur et technologie
info:eu-repo/semantics/nonPublished
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OSTROVSKAYA, OXANA. « Oxidation resistance of Ti-Al intermetallic alloys and protection by ceramic coating ». Doctoral thesis, Politecnico di Torino, 2018. http://hdl.handle.net/11583/2705474.

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In recent years, TiAl intermetallic alloys been widely used in aircraft and automotive industry. With the aim of improving the mechanical behavior and the oxidation resistance at high temperature of the TiAl alloys firstly designed, new intermetallic alloys of second and third generation have been successively developed. In this work, the oxidation resistance in air of four intermetallic alloys of second generation (Ti-48Al-2Cr-2Nb) and third generation ( Ti-48Al-2Nb-0.7Cr-0.3Si, Ti43.5Al-4Nb-1Mo and Ti-47Al-2Cr-8Nb) was investigated by TGA equipment under isothermal conditions in the range of 800-1000 °C. These alloys were cut from the core of bars, previously processed by Electron Beam Melting and successively heat-treated. The composition of the oxide layers was investigated by XRD, SEM-EDS and XPS. Each alloy showed different oxidation behavior at high temperatures. Layer exfoliation or spallation was observed for many samples, but at very different temperatures for the different alloys. When spallation did not happen in a significant extent the oxide layers grew according to a parabolic law. The kinetic rate constants and the activation energies were calculated. These kinetic parameters allowed to assess a rank of oxidation resistance, which can be correlated with the composition of the alloys. In order to improve the oxidation resistance of Ti-48Al-2Cr-2Nb, ceramic nitride coatings were deposited by a High Power Impulse Magnetron Sputtering (HiPIMS) method. Differently engineered TiAlN and TaAlN protective films were processed and their performances compared. Samples were submitted to thermal cycling under oxidizing atmosphere up to 850° C (40 cycles) and 950°C (100 and 200 cycles), at high heating and cooling rates. For this purpose, a burner rig able to simulate the operating conditions of the different stages of turbine engines was used. The microstructure and composition of samples before and after oxidation were investigated by several techniques: microscopy (optical and SEM-EDS), X-ray photoelectron spectrometry (XPS) and X-ray diffraction (XRD). All the TiAlN coatings differently processed provided a remarkable improvement of oxidation resistance. Good adhesion properties were observed even after repeated thermal shocks. HiPIMS pretreatments of the substrate surfaces, performed before the coating deposition, significantly affected the oxidation rate, the oxide layer composition and the coating/substrate adhesion. The oxide layers formed on the sample surface showed different thickness, depending on the presence of the protective coating and the processing path adopted for its deposition. The nitride coatings appreciably enhanced the oxidation resistance and sustained repeated thermal shocks without showing damage or spallation. Differently TaAlN coating did not improve the oxidation resistance of TiAl substrate.
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Denisov, V. N., B. N. Mavrin, E. A. Vinogradov, S. N. Polyakov, A. N. Kirichenko, K. V. Gogolinsky, A. S. Useinov et al. « Characterization of TiAlN coatings ». Thesis, Видавництво СумДУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/20448.

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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 oxidation behaviour was performed and described here. Heat treatments in air between 600-1000°C for different duration were carried out. The Ti[0.44]Al[0.54]Cr[0.02]N coating was used as the starting point for the investigations. The effect of heat on the composition of the interface region was investigated. This region is of utmost importance for the adhesion of the film. In the case of TiAICrN the interface stability was not guaranteed because of diffusion of the substrate elements Cr and Fe to the coating surface after annealing for 1h at 900°C. In comparison, the diffusion of substrate elements Cr and Fe in a ~2.3 mum thick coating of Ti[0.43]Al[0.52]Cr[0.03]Y[0.02]N and of Ti[0.34]Al[0.62]Cr[0.03]Y[0.01]N with overcoat, reached only a distance of ~600nm into the coating. This was achieved by the diffusion of Y to the grain boundaries. Y probably reacted at the same time with inward diffusing O. The diffusion of Y to the boundaries was observed after heat treatment for 1h at 900°C or 10h at 800°C.Ti[0.26]Al[0.26]N/Cr[0.48]N was the coating with the least oxide layer growth after oxidation for 1h at 900°C. An oxide layer thickness of only ~100nm was measured. For the TiAICrYN coating with overcoat an oxide layer of 230nm and for TiAICrYN of 430nm formed after 1h at 900°C. TiAlCrN in comparison formed an oxide layer of ~800nm after 1 h at 900°C.The oxide layers formed after 1h at 900°C consisted mainly of an Al[2]O[3] and TiO[2] bi-layer in the case of TiAlCrN and TiAlCrYN. The addition of a Cr-rich oxynitride overcoat led to the formation of a mixture out of Al[2]O[3], Cr[2]O[3] and TiO[2] in the oxide layer. In the case of TiAlN/CrN, a solid solution consisting of Cr[2]O[3] and Al[2]O[3] was observed. In general a stress relief after heat treatment was observed. At the same time the formation of voids along the column boundaries was identified. This was explained with the relaxation and diffusion of defects created during the deposition process. The effect of different substrate materials on the oxidation behaviour was also investigated. It was found that the formation of substrate oxides on the coating surface is very much dependent on the onset point of oxidation of the substrate material itself. The oxidation of substrate material occurred mainly through growth defects and pinholes. In cases where cracks formed during heat treatment of the coating, the formation of oxides out of substrate elements were observed in cracks connecting the substrate with the coating surface. Changing the bias voltage altered the formation of cracks. This research emphasises the importance of Y in the oxidation mechanism of TiAlN based hard coatings. Y blocks the diffusion path along the column boundaries and thus stowed down the diffusion and oxidation process. At the same time the addition of Cr can increase the oxidation resistance considerably, which was observed in the TiAlCrYN coating with and without overcoat.
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Pilemalm, Robert. « TiAlN-based Coatings at High Pressures and Temperatures ». Licentiate thesis, Linköpings universitet, Nanostrukturerade material, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-112213.

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TiAlN and TiAlN-based coatings that are used of relevance as protection of cutting tool inserts used in metal machining have been studied. All coatings were deposited by reactive cathodic arc evaporation using industrial scale deposition systems. The metal content of the coatings was varied by using different combinations of compound cathodes. The as-deposited coatings were temperature annealed at ambient pressure and in some cases also at high pressure. The resulting microstructure was first evaluated through a combination of x-ray diffraction and transmission electron microscopy. In addition, mechanical properties such as hardness by nanoindentation were also reported. TiAlN coatings with two different compositions were deposited on polycrystalline boron nitride substrates and then high pressure high temperature treated in a BELT press at constant 5.35 GPa and at 1050 and 1300 °C for different times. For high pressure high temperature treated TiAlN it has been shown that the decomposition is slower at higher pressure compared to ambeint pressure and that no chemical interaction takes place between TiAlN and polycrystalline cubic boron nitride during the experiments. It is concluded that this film has the potential to protect a polycrystalline cubic boron nitride substrate during metal machining due to a high chemical integrity. TiZrAlN coatings with different predicted driving forces for spinodal decomposition were furthermore annealed at different temperatures. For this material system it has been shown that for Zr-poor compositions the tendency for phase separation between ZrN and AlN is strong at elevated temperatures and that after spinodal decomposition stable TiZrN is formed.
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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 of the starting films was studied in terms of intermixing between the TiAlN and VN individual layers caused by the absence of shutters during the industrial PVD deposition. A FEGTEM coupled with EELS revealed chemical distribution of individual layers at nanometre resolution. Cs corrected STEM allowed the composition of individual atomic columns to be imaged. It was also used to probe across the interface of TiAlN/VN with angstrom beam (1 A) using EELS which showed a 1±0.1 nm thick intermixing between TiAlN and VN. Film growth and elemental distributions were therefore theoretically predicted in association with substrate rotation. The experimental compositional profiles and the prediction showed good agreement. The coatings deposited with -75 V and -85 V substrate bias voltage were multilayer TiAlNNN, 37at%:::;V:::;55at%, 0.81:::;(Ti+Al)/V:::;1.73, which were used for subsequent oxidation and wear studies. The oxidation behaviour of these coatings in air was investigated using thermal gravimetric analysis up to 1000°C and compared to TiN and TiAlN. Static oxidation of TiAlN/VN films was studied in the range 550-700°C, and characterised by high temperature in-situ X-ray diffraction and STEM/EDXlEELS of selected surface cross-sections. The oxidation resistance of TiAlN/VN was found to be controlled by the VN layers and consequently oxidation was initiated at a lower temperature than TiN and TiAlN coatings. The onset for rapid oxidation of the TiAlN/VN coating was found to be 2550°C. At temperatures >600°C, a duplex oxide structure was formed; the inner layer comprised a porous region of Ti-rich and V-rich nanocrystallites, while several phases were observed in the outer region, including V20 5, Ti02 and AlV04. V20 5 was the dominant oxide at the outer layer at 2638°C. An Au marker study suggested roughly equal diffusivity of cations outward and oxygen inward diffusion occurred during oxidation. Further to the oxidation study, dry sliding ball-on-disc wear tests of TiAlN/VN (V 55.2at%, Ti 28.5at% and Al 16.3at%) coatings on flat stainless steel substrates were undertaken against Ah03 at 25°C, 300°C and 635°C in air to investigate the relation between the presence of V 205 and low friction. The friction coefficient was 0.53 at 25°C which increased to 1.03 at 300°C and decreased to 0.46 at 635°C. Detailed investigation of the worn surfaces was undertaken using site-specific TEM via FIB, along with FTIR and Raman spectroscopy. Microstructure and tribo-induced chemical reactions at these temperatures were correlated with the coating's wear and friction behaviour. The friction behaviour at room temperature is attributed to the presence of a thin hydrated tribofilm and the presence of V 205 at high temperature.
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Beevers, Caroline F. « Structural and tribological properties of TiAlN coatings deposited by CFUBMS ». Thesis, University of Salford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.395861.

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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 regarding activation energy of the transformation and the critical wavelength of the cubic domains at the onset of hexagonal AlN. After nucleation and growth, the hexagonal domains showed a striking resemblance with the preexisting cubic AlN microstructure. During metal cutting, the tool protecting coating is subjected to temperatures of ~900 ºC and pressure levels in the GPa range. The results in this thesis have shown a twofold effect of the pressure on the decomposition steps. Firstly, the spinodal decomposition was promoted by the applied pressure during metal cutting which was shown by comparisons with annealed samples at similar temperatures. Secondly, the detrimental transformation from cubic to hexagonal AlN was shown to be suppressed at elevated hydrostatic pressures. A theoretical pressure/temperature phase diagram, validated with experimental results, also showed suppression of hexagonal AlN by an increased temperature at elevated pressures. The spinodal decomposition during annealing and metal cutting was in this work also shown to be strongly affected by the elastic anisotropy of TiAlN, where the phase separation was aligned along the elastically softer <100> directions in the crystal. The presence of the anisotropic microstructure enhanced the mechanical properties compared to the isotropic case, mainly due to a shorter distance between the c-AlN and c-TiN domains in the anisotropic case. Further improvement of the metal cutting behavior was realized by depositing individual layers with an alternating bias. The individual bias layers exhibited microstructural differences with different residual stress states. The results of the metal cutting tests showed an enhanced wear resistance in terms of both crater and flank wear compared to coatings deposited with a fixed bias.
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Zaroulias, Antonios. « Development of TiAlCr-X coatings for TiAl based alloys ». Thesis, University of Surrey, 2004. http://epubs.surrey.ac.uk/844081/.

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Gamma TiAl based alloys are considered as alternative materials to Ni based superalloys for applications in gas turbine engines. However, they exhibit low oxidation resistance above 700 °C. The need to develop oxidation resistant coatings for gamma-TiAl based alloys was the motivation for this project. Three TiAlCr-X coatings were studied: These were the Ti-50Al-10Cr (TiAlCr) and Ti-48Al-9Cr-4B (TiAlCrB) coatings and the Ti-48Al-9Cr-4B with Ag interlayers multilayer (TiAlCrB/Ag) coating. The coatings were deposited on Ti-48Al-2Nb-2Mn alloy and Si wafer substrates by RF sputtering using optimised deposition parameters. A pure Ag and two alloy (Ti-50Al-10Cr and Ti-48Al-9Cr-4B) targets were used for sputtering. The coatings were studied by SEM, EPMA, XRD, XPS, TEM, DSC, DTA and TG. The morphology and the microstructure of the as-deposited coatings on Si and Ti- 48Al-2Nb-2Mn substrates were the same. All the coatings exhibited dense columnar morphology with ~1 mum thick columns for the TiAlCr and TiAlCrB and coarser columns for the TiAlCrB/Ag. The TiAlCr and TiAlCrB coatings were amorphous with randomly dispersed alpha-Ti nanocrystals. In the TiAlCrB the nanocrystals were smaller (< 15nm) and their volume fraction slightly higher than in the TiAlCr. Thermodynamic calculations confirmed that alpha-Ti is the second favourable phase to form after the amorphous phase at the Tdeposition used. For 1 mum/h deposition rate the amorphous phase formation in the as-deposited microstructure was possible for Tdeposition up to 208 and 223 °C for TiAlCr and TiAlCrB respectively. This variation in Tdeposition is attributed to the higher melting point of the Ti-48Al-9Cr-4B alloy (1123 °C compared to 1080 °C for TiAlCr), which affects the mean surface diffusion length, hi the TiAlCrB/Ag coating the microstructure consisted of crystalline Ag and amorphous TiAlCrB layers. The thermal stability of the as-deposited coatings was assessed by thermal analysis of freestanding deposits and the phase evolution path from the as-deposited metastable to the equilibrium microstructure for TiAlCr and TiAlCrB was defined by XRD and TEM. The TiAlCr crystallized at 657, 690 and 714 °C when heated at 5, 20 and 50 K/min heating rates, respectively. The activation energy for crystallization was 293 KJ/mol, which is very close to the activation energy for volume diffusion of Ti in the gamma phase. The amorphous phase transformed first to the gamma-TiAl and alpha2-Ti3Al phases and then the equilibrium Ti(Cr,Al)2 Laves phase formed very slowly at the expense of the alpha2. The TiAlCrB crystallized at 685, 686 and 690 °C when heated at 50, 65 and 80 K/min heating rates, respectively, with activation energy for crystallization 613 KJ/mol, which indicates the enhanced stability of the TiAlCrB. The phase evolution path of the TiAlCrB was the same with TiAlCr, with the addition of fine borides from the early stages of crystallization. The microstructure of the TiAlCrB was finer than TiAlCr after crystallization. Formation of alpha-Ti nanocrystals ( > 50nm), was noticed when the amorphous TiAlCr was heated at 550 °C, but not in the TiAlCrB after heating at 600 °C, which confirmed the enhanced stability of the TiAlCrB. The oxidation of the coatings, the substrate and target alloys was assessed by TG at 800 °C for 200 hours. The weight change per unit area and the parabolic rate constants were determined for each material. Mixed alumina and titania scales were formed on the specimens. Clusters of coarse titania crystals tended to form on the surface of the scales. Their formation was favoured by the surface roughness of the specimens. The TiAlCrB exhibited the best oxidation resistance of the three coatings, followed by the TiAlCrB/Ag and the TiAlCr.
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Chapitres de livres sur le sujet "TiAlN coating"

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Migal, Yuri F. « DFT-Study of Strength of TiAlN Coating on Iron Surface ». Dans Springer Proceedings in Materials, 207–14. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-76481-4_18.

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Won, Si Tae, et Dong Young Jang. « Measurement of TiAlN Coating Effects on Machining Characteristics of High Hardened Steel ». Dans Advanced Nondestructive Evaluation I, 1357–59. Stafa : Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-412-x.1357.

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Guha, Spandan, et Soham Das. « Structural, Morphological and Mechanical Property Analysis of TiAlN Thin Film Coating Deposited by CVD Technique ». Dans Recent Advances in Thermofluids and Manufacturing Engineering, 413–27. Singapore : Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-4388-1_36.

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Song, Dong Hwan, Woo Yang Jang et Jong Kook Lee. « Corrosion Resistance of TiAlN/CrN, TiAIN, and CrN Coatings Prepared by RF Magnetron Sputtering ». Dans Ceramic Transactions Series, 445–51. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118144145.ch68.

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Chang, Chi Lung, Jui Yun Jao, Wei Yu Ho et Da Yung Wang. « Characteristics of TiAl-Doped DLC/TiAlN/TiN Multilayered Coatings Synthesized by Cathodic Arc Evaporation ». Dans Solid State Phenomena, 247–56. Stafa : Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/3-908451-25-6.247.

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Luo, Q., W. M. Rainforth et W. D. Münz. « Multilayer TiAlN/CrN and Multicomponent TiAlCrN Coatings for Improved Wear Resistance ». Dans Interface Controlled Materials, 100–105. Weinheim, FRG : Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/352760622x.ch17.

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Chlubny, L., J. Lis, M. M. Bućko et D. Kata. « Properties of Hot-Pressed Ti2AlN Obtained by SHS Process ». Dans Advanced Ceramic Coatings and Materials for Extreme Environments II, 171–77. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118217474.ch14.

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Chlubny, L., J. Lis, M. M. Bućko et D. Kata. « Pressureless Sintering and Hot-Pressing of Ti2AlN Powders Obtained by SHS Process ». Dans Advanced Ceramic Coatings and Materials for Extreme Environments, 161–68. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118095232.ch14.

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Pang, W. K., R. I. Smith, V. K. Peterson et I. M. Low. « Kinetics of Phase Decomposition in Ti4AlN3 and Ti2AlN - a Comparative Diffraction Study ». Dans Advanced Ceramic Coatings and Materials for Extreme Environments, 177–86. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118095232.ch16.

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Hsu, Cheng Hsun, Jung Kai Lu et Ming Li Chen. « Study on Characteristics of ADI Coated DLC/ TiN /TiAlN Coatings by Cathodic Arc Evaporation ». Dans Solid State Phenomena, 257–64. Stafa : Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/3-908451-25-6.257.

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Actes de conférences sur le sujet "TiAlN coating"

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Grewal, Jasmaninder Singh, Buta Singh Sidhu et Satya Prakash. « Wear Behaviour of Conventional and Nanostructured Thin Films of Titanium Aluminium Nitride ». Dans ITSC2015, sous la direction de A. Agarwal, G. Bolelli, A. Concustell, Y. C. Lau, A. McDonald, F. L. Toma, E. Turunen et C. A. Widener. ASM International, 2015. http://dx.doi.org/10.31399/asm.cp.itsc2015p1199.

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Abstract Titanium aluminium based nitride (Ti, Al)N coatings possess excellent tribological behaviour with respect to metal cutting and polymer forming contacts. In the present work TiAlN coatings were deposited by plasma spray process. Three coatings of TiAlN were deposited on AISI-347 grade boiler steel substrate out of which two were thin nano coatings deposited at different temperatures of 500°C and 200°C and one conventional coating was deposited by plasma spraying. The as sprayed coatings were characterized with relative to coating thickness, microhardness, porosity and microstructure. The optical microscopy (OM), the XRD analysis and field mission scanning electron microscope (FESEM with EDAX attachment) techniques have been used to identify various phases formed after coating deposited on the surface of the substrate. Subsequently the sliding wear behaviour of uncoated, PVD sprayed nanostructured thin TiAlN coatings deposited at 500°C and 200°C and plasma sprayed conventional coated AISI-347 grade boiler steel were investigated according to ASTM standard G99-03 using pin on disk wear test rig. Cumulative wear volume loss and coefficient of friction, μ were calculated for the coated as well as uncoated specimens for 10, 15 and 20 N normal loads at a constant sliding velocity of 1 m/sec. The worn out samples were analysed with SEM/EDAX. Wear rates in terms of volumetric loss (mm³/g) for uncoated and coated alloys were compared. The nanostructured TiAlN coatings deposited at 500°C and 200°C has shown minimum wear rate as compared to conventional TiAlN coating and uncoated AISI-347 grade boiler steel. Nanostructured TiAlN coatings were found to be successful in retaining surface contact with the substrate after the wear tests.
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Yan, Liang, Yujiro Nakatani, Masayuki Yamada, Toru Abe, Koichi Kitaguchi, Yasunori Ono, Kenji Yamamoto et Jun Munemasa. « Evaluation and Application of Hard Coatings for Steam Turbine ». Dans ASME 2017 Power Conference Joint With ICOPE-17 collocated with the ASME 2017 11th International Conference on Energy Sustainability, the ASME 2017 15th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2017 Nuclear Forum. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/power-icope2017-3440.

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In order to improve solid particle erosion (SPE) resistance for steam turbine blades and nozzles, in corporation with Kobe Steel, Ltd., evaluation of hard coatings of TiN and TiAlN deposited by the Arc Ion Plating (AIP®) process was performed to verify applicability to an actual steam turbine. The results of high-temperature steam oxidation tests and room-temperature sand erosion tests showed that the TiAlN coating had high-temperature stability superior to that of the TiN coating, and erosion resistance far superior to that in the case of the conventional CrC thermal spray coating and boronizing treatment. High-temperature fatigue and creep tests showed that the characteristic strength of the blade material with the TiAlN coating was equal or superior to that of the base blade material. On the basis of the results of comprehensive evaluation, it was confirmed that the TiAlN hard coating has excellent applicability to an actual steam turbine and it was successfully applied to steam turbine blades of power plants in Japan.
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Murčinková, Zuzana, et Jaromír Murčinko. « Coating as Micro-Structural System ». Dans 2nd International Conference on Research in Science, Engineering and Technology. Acavent, 2019. http://dx.doi.org/10.33422/2nd.icrset.2019.11.783.

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The paper provides the application of nanostructured TiAlN and nanocomposite structured TiAlSiN coatings on step drills. The analyses proved that the obtained tool lives are different despite the fact that the same tool geometry, coating, and PVD (physical vapour deposition) technology are used. This disproportion was experimentally tested focusing on surface condition using the pre and post treatment and on the chemical and structural coating composition.
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Budi, Esmar, M. Mohd Razali et A. R. Md Nizam. « Composition, morphology and mechanical properties of sputtered TiAlN coating ». Dans 4TH INTERNATIONAL CONFERENCE ON MATHEMATICS AND NATURAL SCIENCES (ICMNS 2012) : Science for Health, Food and Sustainable Energy. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4868784.

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Lin, Y. J., et Samir A. Khrais. « Tribological Influences of TiAlN Coating on Tool Wear for High-Speed Dry and Wet Machining of Steels ». Dans ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-61574.

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The tribological influences of PVD-applied TiAlN coatings on the wear of cemented carbide inserts and the microstructure wear behaviors of the coated tools under dry and wet machining are investigated. The turning test was conducted with variable high cutting speeds ranging from 210 m/min to 410m/min. The analyses based on the experimental results lead to strong evidences that conventional coolant has a retarded effect on TiAlN coatings under high-speed machining. Microwear mechanisms identified in the tests through SEM micrographs include edge chipping, micro-abrasion, micro-fatigue, micro-thermal, and micro-attrition. These micro-structural variations of coatings provide structure-physical alterations as the measures for wear alert of TiAlN coated tool inserts under high speed machining of steels.
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Jaya, Abdul Syukor Mohamad, Siti Zaiton Mohd Hashim et Md Nizam Abd Rahman. « Fuzzy logic-based for predicting roughness performance of TiAlN coating ». Dans 2010 10th International Conference on Intelligent Systems Design and Applications (ISDA). IEEE, 2010. http://dx.doi.org/10.1109/isda.2010.5687284.

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Moura, Ricardo Ribeiro, et Álisson Rocha Machado. « Machining of VP20ISOF Steel With Resharpened Carbide Tools in End Milling ». Dans ASME 2013 International Manufacturing Science and Engineering Conference collocated with the 41st North American Manufacturing Research Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/msec2013-1052.

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The main objective of the present work is to determine the performance of resharpened integral coated cemented carbide end milling tools. Tools as new and after they have been resharpened were tested, during machining of hard steel used in the mold and die industry. The coatings used were TiAlN and AlCrN. The cutting speed was varied, keeping the depth of cut, the cutting width and the feed per tooth constants. Tests were carried out dry. A 23 factorial design was used, considering the following factors (and levels): cutting speed (80 and 100 m / min), tool coating (TiAlN and AlCrN) and the tool condition (new and reground). The output parameter considered is the tool life (wear rate). At the end of the tool life the wear mechanisms were analyzed within a Scanning Electron Microscopy - SEM. The results showed that in general the AlCrN coated tools outperformed the TiAlN. The performance of resharpened tools was very similar to the new tools, and statistically there is no significant difference between their tool lives.
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Vardanyan, E. L., I. I. Yagafarov et K. N. Ramazanov. « The influence of ion nitriding on adhesion behavior of TiN and TiAl3 / TiAlN coating deposited by vacuum arc plasma ». Dans 2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV). IEEE, 2016. http://dx.doi.org/10.1109/deiv.2016.7764018.

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Wang, Yucong. « Effects of PVD Coatings on Thermal Fatigue Resistance of Hot-Work Tool Steels ». Dans ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-0682.

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Abstract Physical vapor deposit (PVD) coatings have been used to extend die-casting die life, mainly by reducing molten metal’s corrosion and erosion to the dies. The dies are made of hot-work tool steels. Among the tested PVD coatings, CrN and TiAlN coatings provided the longest die life because of their higher oxidation resistance temperatures. Die insert life can be extended three to eight times based on the in-plant tests. However, the thermal fatigue resistance of hot-work tool steels was affected differently by the PVD coatings. The research work in this area is very limited. This paper discusses the results from a systematic study involving three H series and two maraging hot-work tool steels with and without TiN, TiAlN or CrN PVD coating, in terms of thermal cycling induced fatigue (heat checking) resistance, hardness and fracture toughness changes, as well as molten aluminum corrosion resistance. Based on the results, a die life extension approach is proposed to reduce die-casting operation cost and improve casting quality.
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Singh, Sukhinderpal, et Jasmaninder Singh Grewal. « Effect of Varying Load on DLC/AlCrN-Based Coated AISI D2 Die Steel at Constant Sliding Velocity ». Dans ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-72481.

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This study has been made to limit the sliding wear by employing advanced protective nano coatings by using DC magnetron sputtering Physical Vapour Deposition technique. Three advanced nano coatings viz. Diamond-Like Carbon (DLC), composite AlCrN coating and AlCrN/TiAlN multilayered coatings were selected for present work due to their enviable wear resistant characteristics. Coatings were deposited on AISI-D2 die steel by traditional DC magnetron sputtering physical vapour deposition technique. The as deposited coatings were characterized with surface roughness, microhardness, porosity and microstructure. The X-Ray Diffraction (XRD) and field mission scanning electron microscope (FESEM with EDAX) techniques have been used to describe various phases established after coating deposited on the surface of the substrate. Subsequently, sliding wear and friction tests were conducted in accordance with ASTM standard G99-03, under scrutiny variation of load and time and at constant sliding speed. Cumulative wear volume loss and coefficient of friction were formulated for coated as well as uncoated/tempered specimen at a constant speed of 1 m/s and varying load of 25N and 50N. The results from experimentation were analysed with SEM micrographs and Energy dispersive spectrum to analyse the adaptability of coating for base materials, wear behaviour and friction behaviour of coated and uncoated/tempered substrates. The results have shown adaptability of advance nano-coatings for AISI D2 die steel. The generation of oxide layer during wear process provides wear resistance to the AlCrN-based coatings. No thermal instability has been observed in nano-coatings at low temperature generated while experimentation and that is under working range of cold forming processes. It is observed that there is relevant decrease in frictional force by the application of DLC coatings while AlCrN/TiAlN has provided much better wear resistance.
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