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Tytuł:
Abrasive-wear Resistance of Austenitic Cast Iron
Autorzy:
Medyński, D.
Janus, A.
Powiązania:
https://bibliotekanauki.pl/articles/380382.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
abrasive wear
austenitic cast iron
heat treatment
nickel equivalent
transformation of austenite
zużycie ścierne
żeliwo austenityczne
obróbka cieplna
nikiel
transformacja austenitu
Opis:
A research of wear resistance of an austenitic cast iron with higher resistance to abrasive-wear and maintained corrosion resistance characteristic for Ni-Resist cast iron is presented. For the examination, structure of raw castings was first formed by proper selection of chemical composition (to make machining possible). Next, a heat treatment was applied (annealing at 550 °C for 4 hours followed by air cooling) in order to increase abrasive-wear resistance. One of the factors deciding intensity of wear appeared to be the chilling degree of castings. However, with respect to unfavourable influence of chilling on machining properties, an important factor increasing abrasive-wear resistance is transformation of austenite to acicular ferrite as a result of annealing non-chilled castings. Heat treatment of non-chilled austenitic cast iron (EquNi > 16%) resulted in much higher abrasive-wear resistance in comparison to the alloy having pearlitic matrix at ambient temperature (EquNi 5.4÷6.8%).
Źródło:
Archives of Foundry Engineering; 2018, 18, 3; 43-48
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Abrasive Wear Resistance of Chromium Cast Iron
Autorzy:
Kopyciński, D.
Piasny, S.
Kawalec, M.
Madizhanova, A.
Powiązania:
https://bibliotekanauki.pl/articles/381907.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
abrasive wear resistance
white cast iron
carbides
odporność na ścieranie
żeliwo białe
węgliki
Opis:
The resistance of cast iron to abrasive wear depends on the metal abrasive hardness ratio. For example, hardness of the structural constituents of the cast iron metal matrix is lower than the hardness of ordinary silica sand. Also cementite, the basic component of unalloyed white cast iron, has hardness lower than the hardness of silica. Some resistance to the abrasive effect of the aforementioned silica sand can provide the chromium white cast iron containing in its structure a large amount of (Cr, Fe)7C3 carbides characterised by hardness higher than the hardness of the silica sand in question. In the present study, it has been anticipated that the white cast iron structure will be changed by changing the type of metal matrix and the type of carbides present in this matrix, which will greatly expand the application area of castings under the harsh operating conditions of abrasive wear. Moreover, the study compares the results of abrasive wear resistance tests performed on the examined types of cast iron. Tests of abrasive wear resistance were carried out on a Miller machine. Samples of standard dimensions were exposed to abrasion in a double to-and-fro movement, sliding against the bottom of a trough filled with an aqueous abrasive mixture containing SiC + distilled water. The obtained results of changes in the sample weight were approximated with a power curve and shown further in the study.
Źródło:
Archives of Foundry Engineering; 2014, 14, 1; 63-66
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Abrasive wear resistance of matrix composites carbon fiber reinforced polymers
Autorzy:
Olejniczak, Klaudia
Napiórkowski, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/2145887.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
abrasive wear
fibrous composites
carbon fibers
polyester resin
ball-cratering method
Opis:
The paper presents the results of the abrasive wear resistance test of composites based on polymers reinforced with carbon fibers. Two types of fiber composites obtained from a yacht manufacturer were used for the tests. The tests were carried out using the ball-cratering method without abrasive suspension. On the basis of the specific wear rate Kc, better tribological properties of the polyester matrix reinforced with glass fabric were observed compared to the polyester matrix reinforced with a glass emulsion mat. The composite material reinforced with glass cloth was characterized by smaller crater diameters, which may cause plastic deformation due to the low hardness of the material.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2022, 25(1); 139--147
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Abrasive wear resistance of cast iron with precipitates of spheroidal VC carbides
Autorzy:
Kawalec, M.
Olejnik, E.
Powiązania:
https://bibliotekanauki.pl/articles/382894.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
odporność na zużycie ścierne
żeliwo wysokowanadowe
stop eutektyczny
sferoidyzacja
węglik wanadu
abrasive wear resistance
high-vanadium cast iron
eutectic alloy
spheroidization
vanadium carbide
Opis:
The paper presents the results of abrasive wear resistance tests carried out on high-vanadium cast iron with spheroidal VC carbides. The cast iron of eutectic composition was subjected to spheroidising treatment using magnesium master alloy. The tribological properties were examined for the base cast iron (W), for the cast iron subjected to spheroidising treatment (S) and for the abrasion-resistant steel (SH). Studies have shown that high-vanadium cast iron with both eutectic carbides and spheroidal carbides has the abrasion resistance twice as high as the abrasion-resistant cast steel. The spheroidisation of VC carbides did not change the abrasion resistance compared to the base high-vanadium grade.
Źródło:
Archives of Foundry Engineering; 2012, 12, 2; 221-226
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Heat Treatment on Abrasive Wear Resistance of Silumin Matrix Composite Castings
Autorzy:
Gawdzińska, K.
Bryll, K.
Nagolska, D.
Powiązania:
https://bibliotekanauki.pl/articles/352168.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metal composite castings
thermal treatment
tribology
aluminium alloy
Opis:
The authors attempted at examining the effect of heat treatment on abrasive wear resistance of metal composite castings. Metal matrix composites were made by infiltrating preforms created from unordered short fibers (graphite or silumin) with liquid aluminium alloy AlSi12(b). Thus prepared composites were subject to solution heat treatment at a temperature of 520°C for four hours, then aging at a temperature of 220°C for four hours. Abrasion resistance of the material was tested before and after thermal treatment.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 1; 177-182
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure and abrasive wear resistance of 18Cr-4Ni-2.5Mo cast steel
Autorzy:
Kalandyk, B.
Powiązania:
https://bibliotekanauki.pl/articles/380296.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stal wysokostopowa Cr-Ni
mikrostruktura
wykres CTPc
zużycie ścierne
highly alloyed Cr-Ni cast steel
microstructure
equivalent Cr and Ni
CCT diagrams
abrasive wear
Opis:
An influence of a decreased Cr content on the microstructure of the highly alloyed Cr-Ni cast steel, duplex type, melted under laboratory conditions, was characterized in the paper. The microstructure investigations were performed in the initial state and after the heat treatment (solution annealing) at 1060 C as well as the phase transformation kinetics at continuous cooling was measured. The wear resistance of the investigated cast steel was tested and compared with the 24%Cr-5%Ni-2.5%Mo cast steel. The Cr content decrease, in ferritic-austenitic cast steels (duplex), from 24-26%Cr to 18% leads to the changes of the castings microstructure and eliminating of a brittle \sigma phase. In dependence of the casting cooling rate, apart from ferrite and austenite, also fine martensite precipitates occur in the casting structure. It was shown that the investigated cast steel is characterised by a slightly lower wear resistance than the typical cast steel duplex grades.
Źródło:
Archives of Foundry Engineering; 2012, 12, 4; 81-84
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structures of the EL-Hard Padding Welds as a Function of the Abrasive Wear Resistance
Autorzy:
Napiórkowski, J.
Konat, Ł.
Pękalski, G.
Kołakowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/381810.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wear resistant alloy
padding weld layer
operational characteristics
mechanical properties
structural properties
stop odporny na ścieranie
charakterystyka eksploatacyjna
właściwości mechaniczne
właściwości strukturalne
Opis:
In this work we report the phase structures of the EL-Hard padding weld layers and their effect on their abrasive wear resistance. The application of light and electron scanning microscopy examinations revealed subtle differences in the structures of the padding welds which affect their strength and usable properties. Abrasive wear resistance tests utilizing a “spinning bowl” method performed in real soil masses and hardness tests showed a close relationship between the abrasive wear resistance values and chemical composition of the tested padding welds. The obtained results are explained by the presence of the carbide - forming elements such as B, Cr, Mo, Nb, V and W in the chemical composition and types of the carbide phases present in the structures of the EL-Hard padding welds.
Źródło:
Archives of Foundry Engineering; 2013, 13, 1 spec.; 73-82
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of Rare-Earth Metal Oxides on the Tribological Properties of Paddings for use on Mining Machine Parts
Wpływ dodatków tlenków metali ziem rzadkich na właściwości tribologiczne napoin stosowanych na elementach roboczych maszyn dla górnictwa
Autorzy:
Kasińska, Justyna
Madej, Monika
Rutkowski, Sławomir
Powiązania:
https://bibliotekanauki.pl/articles/2134818.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
pad welding
rare-earth metals
tribological wear
abrasive resistance
napawanie
metale ziem rzadkich
zużycie tribologiczne
odporność na ścieranie
Opis:
The article presents the results of research on pad welds made using consumables in the process of metal active gas welding (MAG) combined with plasma arc welding (PAW). The pad weld consisted of a buffer layer and a wear-resistant working layer. Cerium, yttrium and lanthanum oxides were added to the powders to modify the working (active) layer. The HV10 hardness and friction coefficient testing was followed by measuring wear tracks and determining wear indicators (maximum wear track depth and area). Yttrium oxide was found to have a remarkably beneficial effect on nickel-based pad welds. In the case of iron-based welds, the most favourable outcome was observed for lanthanum oxide.
W artykule przedstawiono wyniki badań napoin wykonanych z wykorzystaniem materiałów spawalniczych metodą spawania łukowego elektrodą topliwą (MAG – metal active gas of welding) w połączeniu z napawaniem plazmowym (PAW – pasma arc welding). Napoina składała się z warstwy podkładowej (buforowej) oraz trudnościeralnej warstwy roboczej. Warstwę roboczą modyfikowano poprzez wprowadzanie do proszków tlenków ceru, itru i lantanu. Wykonane napoiny poddano pomiarom twardości HV10 oraz przeprowadzono testy tribologiczne, w których wyznaczono współczynnik tarcia. Następnie dokonano pomiarów śladów zużycia i zostały określone wskaźniki zużycia (maksymalna głębokość wytarcia, pole wytarcia). Wykazano korzystne oddziaływanie w szczególności tlenku itru dla napoin na osnowie niklu. W przypadku napoiny na osnowie żelaza najkorzystniejsze oddziaływanie odnotowano dla tlenku lantanu.
Źródło:
Tribologia; 2022, 2; 23--32
0208-7774
Pojawia się w:
Tribologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Abrasive wear resistance of Fe3Al and Satellite 6 coatings for the protection of valve seats surfaces
Autorzy:
Szczucka-Lasota, Bożena
Tarasiuk, Wojciech
Cybulko, Piotr
Węgrzyn, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/27311342.pdf
Data publikacji:
2023
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
valve seat
abrasive wear
intermetal Fe3Al
Stellite 6
gniazdo zaworu
zużycie ścierne
Opis:
The development of a technology that increases the service life of valve seats in CNG/LNG-powered vehicles requires the appropriate selection of material and the technology of its application. Commercially used valve seat materials show accelerated wear under operating conditions, especially in natural gas vehicle engines. The authors developed a new material concept and a new technological concept for the protection of the valve seat in CNG/LNG-powered vehicles. This article aims to present the first stage of tribological research. Two materials were used in the research: Stellite 6 alloy and Fe3Al intermetal. A commonly used material for valve seats of combustion engines is Stellite 6. The Fe3Al is the new proposed material coating for the protection of the valve seats of internal combustion engines. This article compares the abrasive wear resistance of these materials. The abrasion tests were performed on a T-11 pin-on-disc tester, and the counter-sample was steel S235JR. The test conditions were similar to those prevailing during the operation of the valves in the head of the internal combustion engine, without the influence of temperature. The obtained results indicate that the Fe3Al intermetal is characterized by a lower coefficient of friction and lower wear intensity than Stellite 6. The results confirm that the Fe3Al phase is a prospective material to be used as a protective material on the valve seat of vehicles.
Źródło:
Zeszyty Naukowe. Transport / Politechnika Śląska; 2023, 118; 219--228
0209-3324
2450-1549
Pojawia się w:
Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of hardness of polyurethane on its abrasive wear resistance
Wpływ twardości poliuretanu na jego odporność na zużywanie ścierne
Autorzy:
Capanidis, D.
Powiązania:
https://bibliotekanauki.pl/articles/190192.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
PUR – polyurethane
polyurethane foam
Shore hardness
abrasive wear resistance
PUR – poliuretan
pianka poliuretanowa
twardość Shore'a
odporność na zużywanie ścierne
Opis:
This paper presents the experimental determination of the effect of hardness of the polyurethane (PUR) in a form of the elastomer foam used in various parts of machines or appliances subjected to intensive abrasive wear. Such elements, among others, are static and dynamic technical seals, bumpers, shock-absorbing parts in joints of machine components, and elements of transport equipment in mining or in aggregate and mineral processing [L. 1–3]. Intensive abrasive wear also concerns parts of agricultural and construction machines, road transport, and transport packaging, as well as protective coatings, housing or shields of various machines, and equipment elements [L. 4, 5]. An increase in the abrasive wear resistance of directly determines an increase in the durability and operational reliability of machines and equipment [L. 6]. The hardness of the elastomeric polyurethane influences its physicomechanical and tribological properties [L. 7]. So far, relatively few works have focused on research into the effect of various factors, including the hardness of PUR on the tribological properties of PUR. The aim of this study is to broaden knowledge on the impact of the polyurethane hardness on its resistance to abrasive wear.
W artykule przedstawiono doświadczalne określenie wpływu twardości poliuretanu (PUR) o postaci pianki elastomerowej stosowanej na różne elementy maszyn i urządzeń narażonych na intensywne zużywanie ścierne. Takimi elementami m.in. są: uszczelnienia techniczne spoczynkowe i ruchowe, odboje, części amortyzujące w połączeniach podzespołów maszyn, elementy urządzeń transportowych w przemyśle wydobywczym i przetwórczym kruszyw oraz minerałów. Na intensywne zużywanie ścierne narażone są też części maszyn rolniczych, budowlanych, środków transportu kołowego i opakowań transportowych, jak również powłoki ochronne na różnych elementach, czy też osłony i obudowy wielu innych maszyn i urządzeń. Zwiększenie odporności na zużywanie ścienne tych części bezpośrednio przekłada się na wzrost trwałości i niezawodności eksploatacyjnej maszyn i urządzeń. Twardość PUR o postaci elastomeru ma wpływ na jego własności fizykomechaniczne i właściwości użytkowe, w tym także tribologiczne. Dotychczas stosunkowo niewiele prac dotyczyło badań różnych czynników, w tym twardości PUR, mających wpływ na właściwości tribologiczne PUR. W niniejszej pracy wykazano, że wzrost twardości elastomerowych pianek PUR powoduje zwiększenie ich odporności na zużywanie ścierne.
Źródło:
Tribologia; 2016, 268, 4; 29-39
0208-7774
Pojawia się w:
Tribologia
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:
Changes in Abrasive Wear Resistance During Miller Test of Cr-Ni Cast Steel with Ti Carbides Formed in the Alloy Matrix
Autorzy:
Tęcza, G.
Powiązania:
https://bibliotekanauki.pl/articles/2126908.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
chromium-nickel cast steel
microstructure
titanium carbides
hardness
abrasion
staliwo chromowo-niklowe
mikrostruktura
węgliki tytanu
twardość
ścieralność
Opis:
Austenitic chromium-nickel cast steel is used for the production of machine parts and components operating under corrosive conditions combined with abrasive wear. One of the most popular grades is the GX2CrNi18-9 grade, which is used in many industries, and mainly in the chemical, food and mining industries for tanks, feeders, screws and pumps. To improve the abrasion resistance of chromium-nickel cast steel, primary titanium carbides were produced in the metallurgical process by increasing the carbon content and adding titanium, which after alloy solidification yielded the test castings with the microstructure consisting of an austenitic matrix and primary carbides evenly distributed in this matrix. The measured hardness of the samples in both as-cast conditions and after solution heat treatment was from 300 to 330HV0.02 and was higher by about 40-70 units compared to the reference GX2CrNi18-9 cast steel, which had the hardness of 258HV0.02. The abrasive wear resistance of the tested chromium-nickel cast steel, measured in the Miller test, increased by at least 20% (with the content of 1.3 wt% Ti). Increasing the Ti content in the samples to 5.3 and 6.9 wt% reduced the wear 2.5 times compared to the common GX2CrNi18-9 cast steel.
Źródło:
Archives of Foundry Engineering; 2021, 21, 4; 110--115
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes in Impact Strength and Abrasive Wear Resistance of Cast High Manganese Steel Due to the Formation of Primary Titanium Carbides
Autorzy:
Tęcza, G.
Zapała, R.
Powiązania:
https://bibliotekanauki.pl/articles/383189.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high-manganese steel
microstructure
primary carbides
microhardness
impact strength
abrasion
stal wysokomanganowa
mikrostruktura
węgliki
mikrotwardość
siła uderzenia
Opis:
Cast high-manganese Hadfield steel is commonly used for machine components operating under dynamic load conditions. Their high fracture toughness and abrasive wear resistance is the result of an austenitic structure, which - while being ductile - at the same time tends to surface harden under the effect of cold work. Absence of dynamic loads (e.g. in the case of sand abrasion) causes rapid and premature wear of parts. In order to improve the abrasive wear resistance of cast high-manganese steel for operation under the conditions free from dynamic loads, primary titanium carbides are produced in this cast steel during melting process to obtain in castings, after melt solidification, the microstructure consisting of an austenitic matrix and primary carbides uniformly distributed therein. After heat treatment, the microhardness of the austenitic matrix of such cast steel is up to 580 μHV20 and the resulting carbides may reach even 4000 μHV20. The impact strength of this cast steel varies from 57 to 129 and it decreases with titanium content. Compared to common cast Hadfield steel, the abrasive wear resistance determined in Miller test is at least twice as high for the 0.4% Ti alloy and continues growing with titanium content.
Źródło:
Archives of Foundry Engineering; 2018, 18, 1; 119-122
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative analysis of abrasive-wear resistance of Brinar and Hardox steels
Analiza porównawcza odporności na zużywanie ścierne stali Brinar i Hardox
Autorzy:
Białobrzeska, B.
Konat, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/187927.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
abrasion wear
low-alloy boron steel
dry sand-rubber wheel test
Brinar
Hardox
zużywanie ścierne
niskostopowe stale z borem
test odporności na zużywanie ścierne
Opis:
One of the most important problems encountered during operation of machine parts exposed to abrasive action is their wear. In addition, these parts often work under dynamic loads, so their satisfactory ductility is also required. A combination of these apparently opposing properties is to a large degree possible in low-alloy martensitic steels containing boron. These steels are manufactured by numerous metallurgical concerns, but their nomenclature is not standardised and they appear under names given by the manufacturers, and their specifications are available in commercial information materials only. Till now, Hardox steels have been objects of great interest but, with regard to the continuous development of materials engineering, the created material database requires regular supplementation. To that end, two grades of steels from this group, Brinar 400 and Brinar 500, were subjected to comparative analysis of their abrasive-wear resistance in relation to properties of competitive grades Hardox 400 and Hardox 500. Abrasive-wear resistance tests were carriedout in laboratory conditions using a tribotester T-07. In addition, to identify the main wear mechanisms, worn surfaces of the specimens were examined with use of a scanning electron microscope.
Jednym z najważniejszych problemów, na jaki napotyka się podczas eksploatacji elementów maszyn narażonych na działanie masy ściernej, jest ich zużywanie. Dodatkowo elementy te pracują często w warunkach obciążeń o charakterze dynamicznym, stąd wymaga się od nich również zadowalającej ciągliwości. Połączenie tych, na pierwszy rzut oka, przeciwstawnych właściwości było w dużej mierze możliwe w niskostopowych, martenzytycznych stalach z borem. Stale te są produkowane przez wiele koncernów hutniczych, ale nazewnictwo ich nie jest znormalizowane i występują pod nazwami nadanymi im przez producentów, a dane o nich dostępne są jedynie w materiałach komercyjnych. Do tej pory intensywnie zajmowano się stalami typu Hardox, ale w związku z ciągłym rozwojem inżynierii materiałowej stworzona baza materiałowa wymaga stałych uzupełnień. W tym celu analizie porównawczej, pod względem odporności na zużywanie ścierne, poddano kolejne dwa gatunki należące do tej grupy stali – Brinar 400 i Brinar 500, których właściwości odniesiono do konkurencyjnych stali Hardox 400 i Hardox 500. Badania odporności na zużywanie ścierne tych stali zrealizowano w warunkach laboratoryjnych za pomocą tribotestera T-07. Dodatkowo, w celu zidentyfikowana głównych mechanizmów zużywania, za pomocą elektronowego mikroskopu skaningowego (SEM) zostały przeprowadzone badania wyeksploatowanych powierzchni próbek analizowanych stali.
Źródło:
Tribologia; 2017, 272, 2; 7-16
0208-7774
Pojawia się w:
Tribologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Testing of flame sprayed Al2O3 matrix coatings containing TiO2
Autorzy:
Czupryński, A.
Górka, J.
Adamiak, M.
Tomiczek, B.
Powiązania:
https://bibliotekanauki.pl/articles/356108.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
flame spray process
coating
ceramic powder
abrasive wear resistance
erosion wear resistance
adhesion strength
Opis:
The paper presents the results of the properties of flame sprayed ceramic coatings using oxide ceramic materials coating of a powdered aluininiuni oxide (Al2O3) matrix with 3% titanium oxide (TiO2) applied to unalloyed S235JR grade structural steel. A primer consisting of a metallic Ni-Al-Mo based powder has been applied to plates with dimensions of 5X200X300 mm and front surfaces of ø40x50 mm cylinders. Flame spraying of primer coating was made using a RotoTec 80 torch, and an external coating was made with a CastoDyn DS 8000 torch. Evaluation of the coating properties was conducted using metallographic testing, phase composition research, measurement of microhardness, substrate coating adhesion (acc. to EN 582:1996 standard), erosion wear resistance (acc. to ASTM G76-95 standard), and abrasive wear resistance (acc. to ASTM G65 standard) and thermal impact. The testing performed has demonstrated that flame spraying with 97% Al2O3 powder containing 3% TiO2 performed in a range of parameters allows for obtaining high-quality ceramic coatings with thickness up to ca. 500 μni on a steel base. Spray coating possesses a structure consisting mainly of aluminium oxide and a small amount of NiAl10O16 and NiAl32O49 phases. The bonding primer coat sprayed with the Ni-Al-Mo powder to the steel substrate and external coating sprayed with the 97%Al2O3 powder with 3% TiO2 addition demonstrates mechanical bonding characteristics. The coating is characterized by a high adhesion to the base amounting to 6.5 MPa. Average hardness of the external coating is ca. 780 HV. The obtained coatings are characterized by high erosion and abrasive wear resistance and the resistance to effects of cyclic thermal shock.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 3; 1363-1370
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 51

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