Temat: plasma spray - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Wear and Corrosion Properties of Pure Mo Coating Layer Manufactured by Atmospheric Plasma Spray Process
Autorzy:: Hwang, Yu-Jin
Kim, Yurian
Park, Soon-Hong
Park, Sung Cheol
Lee, Kee-Ahn
Tematy:: thermal spray
atmospheric plasma spray
coating
molybdenum
wear
corrosion; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/59110921.pdf Link otwiera się w nowym oknie
Opis:: A pure molybdenum (Mo) coating layer was manufactured by using the atmospheric plasma spray (APS) process and its wear and corrosion characteristics were investigated in this study. A Mo coating layer was prepared to a thickness of approximately 480 μm, and it had sound physical properties with a porosity of 2.9% and hardness of 434 Hv. Room temperature dry wear characteristics were measured through a ball-on-disk test under load conditions of 5 N, 10 N and 15 N. Based on the coefficient of friction graph at 5 N and 10 N, the oxides formed during wear functioned as a wear lubricant, thereby confirming an increase in wear resistance. However, at 15 N, wear behavior changed, and wear occurred due to splat pulling out. A potentiodynamic polarization test was conducted under an artificial seawater atmosphere, and Ecorr and Icorr measured 0.717 V and 7.2E-5 A/cm2, respectively. Corrosion mainly occurred at the splat boundary and pores that were present in the initial state. Based on the findings above, the potential application of APS Mo coating material was also discussed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Manufacture of MoO3 Coating Layer Using Thermal Spray Process and Analysis of Microstructure and Properties
Autorzy:: Hwang, Yu-Jin
Kim, Kyu-Sik
Park, Jae-Sung
Lee, Kee-Ahn
Tematy:: MoO3
thermal spray
atmospheric plasma spray
microstructure
properties; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/2174568.pdf Link otwiera się w nowym oknie
Opis:: MoO3 thick film was manufactured by using a thermal spray process (Atmospheric Plasma Spray, or APS) and its micro-structure, phase composition and properties of the coating layer were investigated. Initial powder feedstock was composed of an orthorhombic α-MoO3 phase, and the average powder particle size was 6.7 μm. As a result of the APS coating process, a MoO3 coating layer with a thickness of about 90 μm was obtained. Phase transformation occurred during the process, and the coating layer consisted of not only α-MoO3 but also β-MoO3, MoO2. Phase transformation could be due to the rapid cooling that occurred during the process. The properties of the coating layer were evaluated using a nano indentation test. Hardness and reduced modulus were obtained as 0.47 GPa and 1.4 GPa, respectively. Based on the above results, the possibility of manufacturing a MoO3 thick coating layer using thermal spray is presented.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Comparative Rolling Contact Behavior of Two APS Coatings with Different Matrix
Autorzy:: Chicet, Daniela
Toma, Stefan
Haraga, Radu
Bejinariu, Costica
Tematy:: rolling contact fatigue
atmospheric plasma spray
wear path microstructure; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/2125534.pdf Link otwiera się w nowym oknie
Opis:: In this study we analyzed the rolling contact fatigue behavior of two types of coatings made by thermal coating, by the method of atmospheric plasma spraying (APS) from two commercially available powders: Ni5Al5Mo and Al2O3 - 13 TiO2. The contact fatigue behavior was studied on an installation specially designed. The specimens were tested for 54 hours (at 1380 rpm), at a load of 944 N. For both types of coatings, the appearance of a wear path was observed, much more obvious in the case of the Ni matrix layer, also confirmed by profilometry. The mechanism of the wear phenomenon was predominantly of plastic deformation type (the material was pushed towards the edges of the wear path) in the case of NiAlMo coating. In the case of ceramic coating, the wear path width was very small (300-450 μm), with very few changes at the surface level of the coating, which recommends this type of material for applications that require wear resistance to rolling.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Substrate Texture Influence on the Dry Sliding Wear Behaviour of Co-Based Plasma Spray Coating
Autorzy:: Cristisor, Daniel
Chicet, Daniela Lucia
Cirlan Paleu, Cornelia
Stescu, Cristian
Munteanu, Corneliu
Tematy:: Co-base coating
substrate texture
plasma spray coating
dry sliding wear; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/59110653.pdf Link otwiera się w nowym oknie
Opis:: The mechanism in which the coatings made by thermal spraying adhere to the substrate is in most cases of a mechanical nature, thus being dependent on the morphology of the substrate surface. This paper study how the texture of the substrate influences the behavior of dry sliding wear, a behavior based on the adhesion to the substrate of the analyzed coatings. For this purpose, a Co - base powder, was chosen for atmospheric plasma spraying. For the substrate, a rectangular profile made of low-alloy steel was chosen, the surface of which was textured by mechanical abrasion, in order to obtain different degrees of roughness: sample S1 - Ra1 = 1.59 µm, sample S2 - Ra2 = 2.32 µm, sample 3 - Ra3.1 = 1.25 μm, Ra3.2 = 3.88 μm. In the case of sample 3, the texturing was done on one direction, with an elongated profile, so that the effect of the main direction of dry sliding wear on the quality of the coating could be studied. The tests were performed on an Amsler test machine, at constant load, for 1 hour. The samples were mounted in a fixed position, and the wear occurred on the basis of the rotation of the metal disc, without lubrication. It was found that the coating of sample 1 was the most affected, resulting even a partial delamination, and the best behavior was recorded in the case of sample 3.1.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: The influence of plasma gases composition and powder feed rate on microstructure of ceramic coatings obtained by plasma spray physical vapour deposition (PS-PVD)
Wpływ składu chemicznego gazów plazmotwórczych oraz natężenia przepływu proszku na mikrostrukturę warstwy ceramicznej powłokowej bariery cieplnej wytworzonej w procesie fizycznego osadzania z fazy gazowej z odparowaniem w strumieniu plazmy
Autorzy:: Góral, M.
Kubaszek, T.
Tematy:: low pressure plasma spray
LPPS
PS-PVD
plasma spray physical vapour deposition
natryskiwanie plazmowe w warunkach obniżonego ciśnienia
fizyczne osadzanie z fazy gazowej z odparowaniem w strumieniu plazmy; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/175908.pdf Link otwiera się w nowym oknie
Opis:: The article presents results of research on the influence of the chemical composition of the plasma plume and the powder feed rate on microstructure and thickness of the ceramic coating deposited on IN617 alloy substrate by Plasma Spray Physical Vapour Deposition (PS-PVD) method. There were used three powder feed rates: 2, 10 and 30 g/min and five different compositions of plasma gas (Ar, He, H₂ and O₂). Current – 2200 A, a sample rotation speed – 20 RPM and pressure inside of chamber – 150 Pa was fixed. The results showed that it is possible to deposit ceramic layer with lamellar and columnar structure, depends on process parameters. Columnar structure, characteristic for the PS-PVD process, is possible to obtain when the energy of plasma plume is sufficient for evaporating ceramic powder and deposit in on the substrate. The columnar-like structure coatings were obtained in the process with the highest amount of He – 60 dm³/min and lower values of powder feed rate – 2 and 10 g/min. Such effect was observed independently from the additional flow of H₂ and O₂. The columnar-like structure was possible to deposit also with 30 g/min feed rate. However, evaporation of ceramic powder occurred only in the process with only Ar and He in mixture – respectively 35 and 60 dm³/min and with addition only 2 dm³/min O₂ to it. Nevertheless, inside the structure a lot of unmelted particles was visible.
W pracy ustalono wpływ składu chemicznego mieszaniny gazów plazmotwórczych i natężenia przepływu proszku na budowę warstwy ceramicznej na podłożu nadstopu niklu IN-617. Warstwy wytworzono w procesie fizycznego osadzania z fazy gazowej z odparowaniem za pomocą palnika plazmowego (Plasma Spray Physical Vapour Deposition – PS-PVD). Przyjęto natężenie przepływu proszku: 2, 10 i 30 g/min oraz różny skład chemiczny mieszaniny gazów plazmotwórczych (Ar, He, H₂ i O₂). Stosowano natężenie prądu palnika – 2200 A, prędkość obrotową stołu – 20 obr/min oraz ciśnienie w komorze roboczej – 150 Pa. Analiza wyników badań pozwoliła ustalić, że proces fizycznego osadzania z fazy gazowej z odparowaniem w strumieniu plazmy umożliwia wytworzenie warstwy ceramicznej o budowie lamelarnej i kolumnowej. Budowę kolumnową warstwy, charakterystyczną dla procesu PS-PVD, uzyskano dla energii strumienia plazmy zapewniającej odparowanie podawanego proszku. Warstwy takie wytworzono przy dużym natężeniu przepływu He – 60 dm³/min i małej wartości natężenia przepływu proszku – 2 i 10 g/min. Efekt ten obserwowano niezależnie od natężenia przepływu H₂ oraz O₂. Budowa kolumnowa warstwy możliwa jest również do wytworzenia przy największym natężeniu przepływu proszku – 30 g/min. Odparowanie i osadzenie warstwy ceramicznej stwierdzono tylko dla mieszaniny Ar + He o natężeniu przepływu – odpowiednio 35 i 60 dm³/min oraz dla mieszaniny Ar +He z dodatkowym wprowadzeniem tlenu O₂ o natężeniu przepływu – 2 dm³/min. Wytworzone warstwy cechowały się wówczas występowaniem nieodparowanych cząstek proszku.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Effect of Nb and Mo Addition on the Microstructure and Wear Behavior of Fe-Cr-B Based Metamorphic Alloy Coating Layer Manufactured by Plasma Spray Process
Autorzy:: Cho, Yong-Hoon
Ham, Gi-Su
Park, So-Yeon
Kim, Choongnyun Paul
Lee, Kee-Ahn
Tematy:: plasma spray
Fe-Cr-B based metamorphic alloy
Nb addition
microstructure
wear; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/2174563.pdf Link otwiera się w nowym oknie
Opis:: Fe-Cr-B-based metamorphic alloy coating layers were manufactured by plasma spray with a Fe-Cr-B-Mo-Nb composition (hereinafter, M+) powder. The microstructure and wear properties of the coating layers were investigated and compared with a metamorphic alloy coating layer fabricated with commercial m material. XRD analysis revealed that the M and M+ coating layers were composed of α-Fe, (Cr, Fe)2B, and some metallic glass phases. Wear test results showed that M+ coating layers had a superior wear resistance which had 1.48 times lower wear volume than M coating layers. Observations of the worn-out surfaces and cross-sections of the coating layers showed that M+ coating layer had relatively low oxides along the particle boundaries and it suppress a delamination behavior by the oxides.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Research into morphology and properties of TiO2 – NiAl atmospheric plasma sprayed coating
Autorzy:: Maruszczyk, A.
Dudek, A.
Szala, M.
Tematy:: microstructure
titania
TiO2–NiAl
atmospheric plasma spray
TiO2 coating
lamellae
microhardness
porosity; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/102426.pdf Link otwiera się w nowym oknie
Opis:: Titania (TiO2) based coatings are ceramic products with unique properties that make them widely applicable (e.g. in automotive industry, optoelectronics, chemical processing or medicine). Atmospheric plasma spray process enables to deposit TiO2 with addition of NiAl feedstock material which has an influence on coating cohesion and adhesion to substrate. However, the literature and technical notes give little information about parameters of spraying of TiO2-10 wt.% NiAl feedstock powders enables producing coating without nonuniformities including cracks and delamination form substrate. The aim of the work was to verify the parameters of plasma spraying by evaluation of the morphology and properties of manufactured the TiO2-10 wt.% NiAl coatings. Titania based coatings were deposited by means of atmospheric plasma sprayed on steel substrate using TiO2-10 wt.% NiAl feedstock powders. Morphology and microstructure were examined using light optical microscope (LOM) and scanning electron microscope (SEM). Coating chemical composition were analysed by means of SEM-EDS method. Coating surface topography and Knoop microhardness were determined. Porosity and thickness were evaluated by using quantities image analysis programme. Plasma spraying parameters used in our research allow to obtain uniform coating without cracks and delamination at coating-substrate interface. It acknowledges that uniformity of coating technological properties as well manufactured coatings can be put to wear tests, such as high temperature oxidation, corrosion, erosion or cavitation erosion resistance evaluation.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Study on the Phase Composition and Microstructure of Ti-8Al-1Mo-1V After Surface Plasma Nitriding
Autorzy:: Yankova, Radostina
Drenchev, Ludmil
Tematy:: plasma spray
nitriding
indirect plasmatron
surface treatment
Ti-8Al-1Mo-1V; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/59110668.pdf Link otwiera się w nowym oknie
Opis:: The application of titanium alloys is limited due to their low surface hardness and wear resistance, especially for parts operating under friction and contact loads. One of the most widely used technologies for the thermochemical treatment of titanium alloys is gas nitriding. A new method in this direction is surface plasma gas nitriding using indirect arc plasmatrons operating in a chamber with a controlled nitrogen atmosphere. In the present work, the changes in the phase transformations, microstructure, and surface hardness of titanium alloy Ti-8Al-1Mo-1V after plasma gas nitriding at the power of 18 kW, and 25 kW for a time between 5 and 30 minutes are studied. The plasma gas nitriding with the indirect plasmatron of the titanium alloy produced continuous surface layers. Analysis of the surface showed the presence of TiN and TiO2. The thickness of the plasma gas nitrided layers ranges between 100 μm and 350 μm, depending on the technological parameters.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Analysis of Factors Influencing Dry Sliding Wear Behaviour of Laser Remelted Plasma Sprayed Mo Coating Using Response Surface Methodology
Autorzy:: Manjunatha, S. S.
Manjaiah, M.
Basavarajappa, S.
Tematy:: laser remelting
plasma spray
central composite design (CCD)
response surface methodology (RSM)
Mo coating; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/356714.pdf Link otwiera się w nowym oknie
Opis:: Plasma spraying is a process widely used to fabricate wear resistant coatings. However, various problems are associated with plasma spraying out of which poor bonding strength between the coating and the substrate and the high porosity in the as sprayed coatings are of major concern. In order to eliminate these problems and enhance wear performance, the laser remelting process has been used. The laser remelting of plasma sprayed Mo coatings alters the wear mechanism and improves the wear resistance. The wear mechanism and wear volume loss depend on the applied load, sliding speed and sliding distance. Hence, an effort has been made to investigate the effect of process parameters on volume loss using Response Surface Methodology (RSM) based mathematical models. The experiments were planned as per Central Composite Design (CCD). The investigations revealed that the applied load was the most dominant factor affecting the volume loss of the coating. The sliding speed, sliding distance and interaction effects were considered as the next important parameters influencing the volume loss. The investigation also reveals that, the wear volume loss depends on two wear mechanisms, one being the formations of grooves along surface tribo films and other being fracture of splats with delamination of the coating.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: The formation of Si-aluminide coating formed by plasma spraying and subsequent diffusion annealing on Ti-Al-7Nb intermetallic alloy
Autorzy:: Góral, M.
Monteiro, P.C.
Sosnowy, C.
Woźniak, M.
Kubaszek, T.
Kościelniak, B.
Tematy:: TiAl
intermetallics
aluminide coatings
plasma spray
TiAl3
kinetic
materiały międzymetaliczne
powłoki glinkowe
natrysk plazmowy
kinetyka; Pokaż więcej
Wydawca:: Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Powiązania:: https://bibliotekanauki.pl/articles/24200589.pdf Link otwiera się w nowym oknie
Opis:: Purpose: In the article, the kinetic growth phenomena of aluminide coating formed by plasma spraying pure Al-Si powder and subsequent diffusion annealing on TiAl intermetallic alloy in inert atmosphere were investigated. Design/methodology/approach: The Al-Si powder was thermal sprayed (APS) on TiAl7Nb intermetallic alloy and annealed in Ar atmosphere during 5, 15, 30, 60, 240 and 480 min. The kinetic growth of the coating was observed using the scanning electron microscopy method (SEM), and chemical composition was analysed using the EDS method. Findings: The Kirkendall Effects pores formation, as well as titanium silicides on the grain boundary of TiAl3, was found. Research limitations/implications: The oxidation resistance of the developed coating might be analysed in further work. Practical implications: The developed coating might be used for the production of protective aluminide coatings on TiAl intermetallic alloys. Originality/value: The description of aluminide coating formation in a new technological process.
Dostawca treści:: Biblioteka Nauki

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