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    Wyświetlanie 1-11 z 11
    Tytuł:
    Gas Evolution Rates of Graphite Protective Coatings in Dependence on the Applied Solvent and Kind of Atmosphere
    Autorzy:
    Kmita, A.
    Drożyński, D.
    Mocek, J.
    Roczniak, A.
    Zych, J.
    Holtzer, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/353353.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    emission of gases
    protective coatings
    environmental
    Opis:
    The results concerning emission of gases from two commercial graphite protective coatings for moulds and cores (water and alcoholic) are given in the hereby paper. Investigations were performed in two systems. One of the systems was corresponding to conditions occurring inside the mould cavity immediately after its pouring with liquid metal (Method 1), while the second was simulating conditions deep inside the mould at a certain distance from the casting (Method 2). Investigations were carried out in the CO2 atmosphere and in the air. The water protective coating generated 1.5 to 3 times larger volume of gases than the alcoholic coating (in dependence on the measuring method and atmosphere). The smallest differences occurred in the air atmosphere, while the largest in the CO2 atmosphere.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 4; 2129-2134
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effectiveness of Protective Action of Coatings from Moisture Sorption into Surface Layer of Sand Moulds
    Autorzy:
    Kaźnica, N.
    Zych, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/354937.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    surface layer
    furan moulding sands
    protective coatings
    moisture sorption
    Opis:
    The results of investigations of the sorption process of surface layers of sand moulds covered by zirconium and zirconium - graphite alcohol coatings are presented in the paper. Investigations comprised two kinds of sand grains (silica sand and reclaimed sand) of moulding sand with furan resin. Tests were performed under conditions of a high relative air humidity 75-85% and a constant temperature within the range 28–33°C. To evaluate the effectiveness of coatings protective action from moisture penetration into surface layers of sand moulds gravimetric method of quantitavie moisture sorption and ultrasonic method were applied in measurements. The optimal number and kind of coatings from the viewpoint of protection from moisture sorption were specified for furan moulding sands with quartz sand and reclaimed sand as well. Knowledge of proper coatings selection is important due to protection from high air humidity and its adverse effects. What is more, it can allow to select the proper storage conditions of casting moulds waiting for being poured with liquid metals. This can limit the occurrence of surface defects which are caused by too high humidity of casting moulds, especially in surface layer.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 4; 2111-2116
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of BN or SiC Addition on PEO Properties of Coatings Formed on AZ91 Magnesium Alloy
    Autorzy:
    Pelczar, D.
    Długosz, Piotr
    Darłak, P.
    Szewczyk-Nykiel, Aneta
    Nykiel, Marek
    Hebda, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2048800.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    composite oxide film
    abrasive wear resistance
    corrosion behavior
    scratch resistance
    protective coatings
    Opis:
    Currently, due to the economic and ecological aspects, light alloys are increasingly important construction material, in particular in the transport industry. One of the popular foundry magnesium alloys is the alloy AZ91, which among others due to mechanical properties and technological features, is used, for example, for light structural parts. The paper presents the results of research on modification of the AZ91 alloy surface layer in the plasma electrolytic oxidation process. The change of usable properties of the produced coatings was obtained by introducing additions of silicon carbide or boron nitride. The thickness and hardness of the protective layers produced, resistance to scratches and corrosion resistance were determined. Moreover, the friction coefficient of the coating-steel pair was investigated. The quality of the connections made between the coating and the substrate, i.e. the magnesium alloy, was also evaluated. The results obtained for coatings with silicon carbide or boron nitride additives were always compared to the results obtained for unmodified samples. On the basis of the obtained results, it was shown that the introduction of boron nitride additive to the AZ91 alloy coating produced in the plasma electrolytic oxidation process significantly improves the resistance to: (i) corrosion and (ii) abrasive wear of the coating.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 1; 147-154
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Assessment of the Permeability of Selected Protective Coatings Used for Sand Moulds and Cores
    Autorzy:
    Jamrozowicz, Ł.
    Siatko, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/381009.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    permeability
    protective coatings
    coating viscosity
    core
    mold
    przepuszczalność
    powłoki ochronne
    lepkość powłoki
    rdzeń
    forma
    Opis:
    The article presents the results of permeability measurements of a zirconium alcohol coating applied on moulds and cores. The introduction extensively discusses the reasons for the application of protective coatings, as well as their advantages and disadvantages. Also, the problems related to the application of protective coatings are presented i.e. limited permeability and thus the possibility of the presence of gas-originated defects in the casts. Next, the paper discusses the methods of measuring the permeability of protective coating proposed by Falęcki and Pacyniak. The study also presents an indirect permeability measurement method. For the investigations, zirconium alcohol coatings with the three conventional viscosities 10, 20 and 30s were used. The viscosity was determined by means of the Ford cup with the clearance of 4mm. The coatings were applied onto profiles of Φ 50x50 mm, made of moulding sand consisting of a sand matrix with the mean grain size of dL = 0,11, 17, 24, 31 and 34 mm and phenol-formaldehyde resin. The effect of the matrix grain size on the permeability of the sand with and without a coating was determined.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 1; 17-22
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gaseous Atmosphere During Gas Forming Tendency Measurements of the Selected Protective Coatings for Sand Moulds
    Autorzy:
    Mocek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2079824.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gas forming
    oxygen
    hydrogen
    carbon monoxide
    protective coatings
    gaz
    tlen
    wodór
    tlenek węgla
    powłoki ochronne
    Opis:
    Protective coatings have direct contacts with hot and liquid alloys. As the result of such contacts gases are emitted from coatings. Gas forming is a tendency of the tested material to emit gases under a temperature influence. In order to assess the gas forming tendency either direct or indirect methods are applied. In the hereby work, the measurements of the gas forming tendency were performed under laboratory conditions, by means of the developed indirect method. The research material constituted samples of six selected protective coatings dissolved either in alcohol or in water. These coatings are applied in sand moulds and cores for making cast iron castings. The assessment of their gas forming tendency was presented in relation to temperatures and heating times. The occurrence and changes of oxygen and hydrogen contents in gases outflowing from the measuring flask during tests, were measured by means of gas sensors. The process of the carbon monoxide (CO) emission during tests was also assessed. The following gas sensors were installed in flow-through micro chambers: for oxygen - lambda probe, for hydrogen – pellistor, for carbon monoxide - sensor (dedicated for CO) FIGARO TGS 822 TF. The results of direct CO measurements were recalculated according to the algorithm supplied by the producer of this sensor.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 3; 11-18
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rola kształtu powierzchni formy w procesie wysychania wybranych powłok ochronnych
    The Role of the Surface Shape of the Mould in the Process of Drying of Selected Protective Coatings
    Autorzy:
    Jamrozowicz, Ł.
    Zych, J.
    Kolczyk, J.
    Wróblewski, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/381974.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    forma piaskowa
    powłoki ochronne
    szybkość wysychania
    technika grawimetryczna
    sand mould
    protective coatings
    speed drying
    gravimetric technique
    Opis:
    W artykule zaprezentowano wyniki badań szybkości schnięcia wybranych powłok ochronnych. Badaniom poddano powłokę wodną WC-R i alkoholową Zirkofluid 1219. Wyznaczono kinetykę wysychania powłok. Powłoki była nanoszono na rdzenie wykonane z masy o średniej wielkości ziarna osnowy dL= 0,24 mm. Ponadto wyznaczono szybkość wysychania powłok dla trzech ich lepkości umownych (11s; 20s; 30s). Lepkość powłok określono przy pomocy kubka „Forda”. Badania szybkości wysychania powłoki ochronnej prowadzono techniką grawimetryczną. Proces wysychanie mierzono w sposób ciągły. Badania prowadzono w kontrolowanych warunkach: stała temperatura otoczenia, wilgotność powietrza. Stwierdzono, iż czas schnięcia powłoki naniesionej na powierzchnie wypukłe (garby formy) jest dużo krótszy niż powłoki naniesionej na powierzchnie wklęsłe (wnęki). Różnice szybkości wysychania wynikają z odmienności warunków wymiany pary wydzielanej z powłoki do otoczenia.
    Investigation results of the drying rate of the selected protective water coatings are presented in the paper. The water-based coating WC-R and alcohol-based coating Zirkofluid 1219 were subjected to examinations. They were drying kinetics of these coatings. The coating was applied to the cores of the mass matrix with a grain size of dL = 0.24 mm. In addition, the kinetics of the coating drying process was determined for three apparent viscosities: 11s; 20 s; 30 s. The coating viscosity was estimated by means of the Ford 4 mm cup. Drying rates of the protective coating were examined by using the gravimetric technique. Measurements were carried out in a continuous way under controlled conditions: constant ambient temperature and air humidity. It was found that the drying time of a coating applied to the convex surfaces (humps mould) is much shorter than the coating applied to the surfaces of the concave (cavities). Differences in the rate of drying due to differences in the exchange of a vapour of the coating secreted into the surroundings.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 2 spec.; 39-44
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selection of protective coatings of moulds for castings of high-manganese cast steel in dependence of the applied moulding sand kind
    Dobór powłoki ochronnej na formy dla odlewów ze staliwa wysokomanganowego w zależności od rodzaju stosowanej masy
    Autorzy:
    Holtzer, M.
    Bobrowski, A.
    Drożyński, D.
    Mocek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/353882.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high-manganese cast steel
    protective coatings
    moulding sand
    resins
    staliwo wysokomanganowe
    powłoki ochronne
    żywica formierska
    masa formierska
    Opis:
    High-manganese cast steels are characterised by a high abrasion resistance under friction conditions with a simultaneous influence of pressure and impacts. This cast steel is especially suitable for castings of excavator’s scoops, track links, streetcars crossovers, parts of crushers and mills for braking up of hard materials [1-4]. In order to obtain high quality castings of high-manganese cast steels in moulds on the high-silica sand matrices it is necessary to apply protective coatings, which prevent a direct contact between metal and matrix (SiO2). Manganese after being poured into a mould can undergo a partial oxidation forming MnO, which reacts with silica. As a result low-melting manganese silicates are formed, which in a form of a tight layer adhere to the casting surface, significantly increasing a labour input related to cleaning. Three kinds of protective coatings were tested: zirconium, corundum and magnesite. As a base moulding sands on high-silica sand matrices with three kinds of resol resins were applied. The quality of the obtained casting surface was assessed in dependence of the protective coating and resin kind and also in dependence of the metallostatic pressure value.
    Staliwo wysokomanganowe odznacza się dużą odpornością na ścieranie w warunkach tarcia z jednoczesnym działaniem nacisku i uderzeń. Staliwo to nadaje się szczególnie na odlewy czerpaków koparek, ogniwa gąsienic traktorów, krzyżownic tramwajowych, części kruszarek i młynów do rozdrabniania twardych materiałów [1-4]. Aby uzyskać wysokiej jakości odlewy ze staliwa wysokomanganowego w masach na osnowie piasku kwarcowego konieczne jest stosowanie powłok ochronnych, które zapobiegają bezpośredniemu kontaktowi metalu z osnową, a konkretnie z SiO2. Mangan, po zalaniu metalu do formy może ulegać częściowemu utlenieniu tworząc m.in. MnO, który reaguje z krzemionką. W wyniku tworzaąsię niskotopliwe krzemiany manganu, które szczelną warstwą przylegają do powierzchni odlewu, znacznie zwiększając nakład pracy na oczyszczanie. Przebadano trzy rodzaje powłok ochronnych: cyrkonowa, korundowa i magnezytowa. Jako podłoże stosowano masy na osnowie piasku kwarcowego z trzema rodzajami żywicy rezolowej. Oceniano jakość uzyskiwanej powierzchni odlewu w zalezności od rodzaju powłoki ochronnej, rodzaju zywicy oraz wielkości ciśnienia metalostatycznego.
    Źródło:
    Archives of Metallurgy and Materials; 2013, 58, 3; 853-857
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the Mould Material Coatings on the Microstructure of AlSi7Mg Alloy
    Autorzy:
    Dybowski, B.
    Poloczek, Ł.
    Jarosz, R.
    Kiełbus, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/383041.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metallography
    AlSi7Mg alloy
    protective coatings
    sand casting
    metalografia
    stop AlSi7Mg
    powłoki ochronne
    odlewy piaskowe
    Opis:
    Family of the aluminium alloys with silicon addition is an important group of non-ferrous casting alloys. They exhibit very good technological properties, especially castability. Aluminium alloys are known for their low density, which in connection with high mechanical properties and relatively low price create very good structural material. Magnesium addition to the Al-Si alloys enables their age-hardening, resulting in even better mechanical properties. However, formation of the microstructure of the alloy has to be precisely controlled to avoid formation of massive, brittle silicon crystal. Presence of large, platelet-like particles of silicon, dramatically decreases material mechanical properties. Second factor, which must be taken into consideration is casting porosity, which may significantly decrease fatigue life of the element. Many researches consider effect of modification or refining on the microstructure of the castings made from the Al-Si alloys. However there is lack of detailed investigation on the mould components influence on the microstructure. Such components may be protective coatings applied for the mould sand during the gravity casting of Al-Si alloys. Following paper presents results of the research on the influence of applied mould protective coatings on the microstructure of AlSi7Mg sand cast alloy. Five different protective coatings were applied. Macro observations, qualitative and quantitative microstructure evaluation of the AlSi7Mg alloy was conducted during the researches. Results revealed, that application of the coatings does not influence the size and distribution of the α- Al dendrites, however it influences size of Si particles in a significant way. It was revealed that application of water-based coatings affects the heat flow in the mould material-liquid alloy system, thus causing growth of silicon particles.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 1 spec.; 13-16
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the Quality of Coatings Deposited on AZ31 Magnesium Alloy Using the Anodising Method
    Jakości powłok wykonanych na stopie magnezu Az31 metodą anodowania
    Autorzy:
    Wieczorek, J.
    Oleksiak, B.
    Mizera, J.
    Kulikowski, K.
    Maj, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/351825.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    magnesium alloys
    protective coatings
    anodising
    scratch test
    erosion testing
    stopy magnezu
    powłoki ochronne
    anodowanie
    próba zarysowania
    badania erozji
    Opis:
    The paper presents results of a study on the quality of coatings deposited on surfaces of AZ31 magnesium alloy products. In order to obtain protective coatings (corrosion and erosive wear protection), the methods of anodising (specimens A, B and C) and, for comparison, electroless plating (specimen D) were applied. The assessment of coating quality was based on the scratch test results. The results were used for determination of critical loads resulting in coating rupture. The best result was obtained for the specimen B (sulphuric acid anodising in combination with sealing): the critical load was 7.5 N. The smallest value (5.5 N) was observed for the specimen D, i.e. the coating produced using the electroless plating method. Moreover, erosion resistance of the coatings was assessed. In this case, a depth of the wear trace due to an erodent agent (SiC powder) effects was investigated. The results are comparable to those obtained in the scratch test. The poorest erosion resistance is demonstrated by the coating D and the best resistance is observed for the coating B.
    W artykule przedstawiono wyniki badań jakości powłok wytworzonych na powierzchni wyrobów ze stopu magnezu AZ31. Dla wytworzenia powłok o charakterze ochronnym (ochrona przed korozją i zużyciem erozyjnym), zastosowano metodę anodowania (próbki A, B i C) oraz dla porównania metodę bezprądową (próbka D). Ocenę jakości powłok oparto o wynik próby zarysowania (scratch-test). Na podstawie uzyskanych wyników wyznaczono krytyczne obciążenie, przy którym następuje przebicie powłoki. Najlepszy wynik uzyskano w przypadku próbki B (anodowanie w kwasie siarkowym połączone z uszczelnianiem), wartość krytycznego obciążenia wynosiła 7.5 N. Najmniejszą wartość obciążenia krytycznego 5.5 N, zarejestrowano w przypadku próbki D tj. powłoki wytworzonej bezprądowo. Oceniono także odporność powłok na zużycie erozyjne. W tym przypadku badano głębokość śladu powstałego wskutek oddziaływania na powierzchnię próbek ścierniwa (proszek SiC). Uzyskane wyniki są podobne do zarejestrowanych w próbie zarysowania. Najmniejszą odpornością na erozję charakteryzuje się powłoka wytworzona bezprądowo (D) a największą powłoka anodowana i uszczelniana (B).
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 4; 2843-2850
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Humidity Migration in Surface Layers of Sand Moulds During Processes of Penetration and Drying of Protective Coatings
    Autorzy:
    Jamrozowicz, Łukasz
    Zych, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/2203936.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    surface layers
    sand mould
    porous medium
    humidity migration
    protective coatings
    resistance measurement
    warstwy powierzchniowe
    formy piaskowe
    migracja wilgoci
    powłoki ochronne
    pomiar rezystancji
    Opis:
    The results of investigations of humidity migration in near surface layers of sand mould during processes of penetration and drying of protective coatings are presented in the hereby paper. The process of the humidity exchanging between surroundings and moulding sands as porous materials, is widely described in the introduction. In addition, the humidity flow through porous materials, with dividing this process into stages in dependence of the humidity movement mechanism, is presented. Next the desorption process, it means the humidity removal from porous materials, was described. Elements of the drying process intensity as well as the water transport mechanisms at natural and artificial drying were explained. The innovative research stands for measuring resistance changes of porous media due to humidity migrations was applied in investigations. Aqueous zirconium coatings of two apparent viscosities 10s and 30s were used. Viscosity was determined by means of the Ford cup of a mesh clearance of 4mm. Coatings were deposited on cores made of the moulding sand containing sand matrix, of a mean grain size dL = 0.25 mm, and phenol-formaldehyde resin. Pairs of electrodes were placed in the core at depths: 2, 3, 4, 5, 8, 12 and 16 mm. Resistance measurements were performed in a continuous way. The course of the humidity migration process in the core surface layer after covering it by protective coating was determined during investigations. Investigations were performed in the room where the air temperature was: T = 22 oC but the air humidity was not controlled, as well as in the climatic chamber where the air temperature was: T =35 oC and humidity: H = 45%. During the research, it was shown that the process of penetration (sorption) of moisture into the moulding sand is a gradual process and that the moisture penetrates at least 16 mm into the sand. In the case of the drying (desorption) process, moisture from the near-surface layers of the moulding sand dries out much faster than moisture that has penetrated deeper into the sand.
    Źródło:
    Archives of Foundry Engineering; 2022, 22, 4; 72--78
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Possibilities of using aluminide coating modifications by nickel galvanizing with introduction of additional elements: CR, SI and ZR
    Modyfikowanie warstw aluminidkowych Cr, Si i Zr w procesach niklowania elektrochemicznego i chemicznego osadzania z fazy gazowej CVD
    Autorzy:
    Góral, M.
    Nieużyła, Ł.
    Pytel, M.
    Simka, W.
    Kubaszek, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/175906.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminide coatings
    protective coatings
    aluminizing processes
    pack aluminizing
    gas phase aluminizing
    chemical vapour deposition
    modified aluminide coatings
    warstwy aluminidkowe
    powłoki ochronne
    procesy aluminiowania
    aluminiowanie metodą kontaktowo-gazową
    aluminiowanie metodą gazową
    chemiczne osadzanie z fazy gazowej
    modyfikowane warstwy aluminidkowe
    Opis:
    The basic method of surface protection for aviation engine components manufactured from nickel super alloys is diffusion aluminization. There are four methods of forming aluminide coatings: pack cementation, above the pack, slurry, and chemical vapor deposition (CVD). The aluminide coatings are modified with various elements, e.g. Pt, Pd, Hf, Zr, Si, Cr, Y, etc. The paper show results of experiments on the use of electrochemical processes in which the modifying elements are introduced in the form of powder for galvanic bath. These processes have been combined with low-activity and high-activity aluminization, as well as zircon doping in the CVD process. It has been shown that the aluminide coatings formed in the high-activity process are characterized by Al>50% at. content. The aluminide coatings formed in the low-activity process were composed of an outer zone composed of a NiAl phase with an aluminum content <50% at. and the diffusion zone. The aluminide coatings formed during low-activity zircon doping have similar structure. The content of elements introduced with nickel was low (up to several %), which does provide for a desired increase in heat resistance of the modified coatings.
    Aluminiowanie dyfuzyjne jest podstawowym procesem wprowadzonym do ochrony powierzchni elementów części gorącej silników lotniczych wytwarzanych z nadstopów niklu. Warstwy aluminidkowe wytwarzane są w procesach: kontaktowo-gazowym (ang. pack cementation), gazowym bezkontaktowa (ang. above the pack), zawiesinowowym (ang. slurry) i chemicznym osadzaniu z fazy gazowej CVD (ang. Chemical Vapour Deposition). Warstwy aluminidkowe dla zwiększenia ich żaroodporności modyfikowane są pierwiastkami m.in. Pt, Pd, Hf, Zr, Si, Cr, Y. W artykule przedstawiono analizę wyników badań warstw aluminidkowych, w których pierwiastki modyfikujące wprowadzono w postaci proszku do kąpieli galwanicznej w trakcie procesu niklowania. Procesy te połączono z aluminiowaniem nisko- i wysokoaktywnym, a także cyrkono-aluminiowaniem w procesie CVD. Wykazano, że warstwy aluminidkowe wytworzone w procesie wysokoaktywnym charakteryzują się zawartością Al >50% at. W warstwie aluminidkowej wytworzonej w procesie niskoaktywnym wyodrębniono strefę zewnętrzną - kryształów fazy NiAl o zawartości Al <50% at. oraz strefę dyfuzyjną. Zbliżoną budowę miały warstwy aluminidkowe wytworzone w trakcie cyrkono-aluminiowania niskoaktywnego. Stwierdzono małe zawartości pierwiastków wprowadzanych wraz z niklem (do kilku %).
    Źródło:
    Advances in Manufacturing Science and Technology; 2018, 42, 1-4; 87-96
    0137-4478
    Pojawia się w:
    Advances in Manufacturing Science and Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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