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Wyświetlanie 1-15 z 25
Tytuł:
Proces niskotemperaturowej biokatalizy na przykładzie grzybowej biotransformacji [alfa]-pinenu
Low-temperature biocatalysis as an example of microbial biotransformation of alpha-pinene
Autorzy:
Skowroński, J.
Trytek, M.
Fiedurek, J.
Powiązania:
https://bibliotekanauki.pl/articles/256660.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
Tematy:
biokataliza
biotransformacja
drobnoustroje psychrotroficzne
biocatalysis
biotransformation
psychrotrophic microorganisms
Opis:
Katalizatory warunkują przebieg oraz odpowiednią wydajność wielu reakcji chemicznych. Przemiany biochemiczne w większości przypadków katalizowane są z udziałem enzymów. Szczególne cechy biokatalizatorów są powszechnie wykorzystywane w przemyśle, a w ostatnich latach drobnoustroje ekstremofilne, adaptowane do skrajnych warunków abiotycznych, wzbudzają duże zainteresowanie licznej grupy badaczy. Wyjątkowe predyspozycje biokatalizatora psychrotroficznego z dobrymi efektami zostały wykorzystane w procesie biotransformacji a-pinenu do werbenolu i werbenonu, będących cennymi związkami smakowo-zapachowymi stosowanymi w branży spożywczej i kosmetycznej. Uzyskane wyniki (sumaryczne stężenie produktów przekraczające 0,5 g/dm3) stanowią obiecującą perspektywę wykorzystania tego typu procesów w większej skali (ponadlaboratoryjnej).
Many chemical reactions and their appropriate performance depend on catalysis. Most biochemical reactions are catalysed by enzymes. Special features of these biocatalysts are commonly employed in industry and current researches are focused on psychrotrophic microorganisms. These unique organisms can be a rich source of useful biocatalysts for biotransformation of a-pinene to verbenol and verbenone - valuable compounds used as flavours and fragrances. Results obtained in this study are promising for further application in the large scale.
Źródło:
Problemy Eksploatacji; 2013, 1; 101-111
1232-9312
Pojawia się w:
Problemy Eksploatacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Usable Properties of AlSi7Mg Alloy after Sodium or Strontium Modification
Autorzy:
Tupaj, M.
Orłowicz, A. W.
Mróz, M.
Trytek, M.
Markowska, O.
Powiązania:
https://bibliotekanauki.pl/articles/381773.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
alloy AlSi7Mg
refining
modification
cooling rate
microstructural parameters
usable properties
stop AlSi7Mg
rafinacja
modyfikacja
szybkość chłodzenia
parametry mikrostruktury
właściwości użytkowe
Opis:
The paper deals with the effect of microstructure diversified by means of variable cooling rate on service properties of AlSi7Mg cast alloy refined traditionally with Dursalit EG 281, grain refining with titanium-boron and modified with sodium and a variant of the same alloy barbotage-refined with argon and simultaneously grain refining with titanium-boron and modified with strontium. For both alloy variants, the castings were subject to T6 thermal treatment (solution heat treatment and artificial aging). It turned out that AlSi7Mg alloy after simultaneous barbotage refining with argon and grain refining with titanium-boron and modified with strontium was characterised with lower values of representative microstructure parameters (SDAS – secondary dendrite arm spacing, λE, lmax) and lower value of the porosity ratio compared to the alloy refined traditionally with Dursalit EG 281 and grain refining with titanium-boron and modified with sodium. The higher values of mechanical properties and fatigue strength parameters were obtained for the alloy simultaneously barbotage-refined with argon and grain refining with titanium-boron and modified with strontium.
Źródło:
Archives of Foundry Engineering; 2016, 16, 3; 129-132
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stress rupture test of MAR-M509 alloy with structure refined by rapid resolidification
Autorzy:
Mróz, M.
Orłowicz, W.
Tupaj, M.
Trytek, A.
Powiązania:
https://bibliotekanauki.pl/articles/380450.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stop MAR M509
mikrostruktura
MAR-M509 alloy
rapid resolidification
microstructure
stress rupture test
Opis:
This study presents results of stress rupture test of MAR-M-509 cobalt alloy samples, as-cast and after surface refining with a concentrated stream of heat. Tests were conducted on samples of MAR-M-509 alloy castings, obtained using the lost-wax method. Casting structure refining was performed with the GTAW method in argon atmosphere, using the current I = 200 A and electrical arc scanning velocity vs = 100, 150, 200 and 250 mm/min. The effect of rapid resolidification of the MAR-M-509 alloy on the microstructure was examined and significant improvement in stress rupture test was observed.
Źródło:
Archives of Foundry Engineering; 2012, 12, 4; 117-120
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Examination of cast iron material properties by means of the nanoindentation method
Autorzy:
Trytek, A.
Orłowicz, W.
Tupaj, M.
Mróz, M.
Powiązania:
https://bibliotekanauki.pl/articles/380438.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
żeliwo
krystalizacja szybka
próba indentacji
cast iron
rapid crystallization
indentation test
Opis:
The paper presents results of examination of material parameters of cast iron with structure obtained under rapid resolidification conditions carried out by means of the nanoindentation method.
Źródło:
Archives of Foundry Engineering; 2012, 12, 4; 141-144
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Examination of Cast Iron Material Properties by Means of the Scratch Method
Autorzy:
Trytek, A.
Orłowicz, W.
Mróz, M.
Tupaj, M.
Powiązania:
https://bibliotekanauki.pl/articles/382221.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cast iron
structure
GTAW process
scratch test
żeliwo
struktura
proces GTAW
test zarysowania
Opis:
The paper presents results of examination of unalloyed cast iron with diversified structure of the metallic matrix carried out by means of the scratch method. The research work was carried out with cast sample plates and with castings superficially remelted by means of the Gas Tungsten Arc Welding (GTAW) method. The test was carried out with load force of 5 N. Parameters such as the coefficient of friction, penetration depth, and acoustic emission were analysed.
Źródło:
Archives of Foundry Engineering; 2012, 12, 2s; 75-80
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Combustion Engine Cylinder Liners Made of Al-Si Alloys
Autorzy:
Orłowicz, A. W.
Tupaj, M.
Mróz, M.
Trytek, A.
Powiązania:
https://bibliotekanauki.pl/articles/382953.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
combustion engine
cylinder liner
Al-Si alloy
silnik spalinowy
tuleja cylindrowa
stop Al-Si
Opis:
The paper deals with problems related to application of aluminum-silicon alloys for combustion engine cylinder liners.
Źródło:
Archives of Foundry Engineering; 2015, 15, 2; 71-74
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improvement of Al-Si Alloy Fatigue Strength by Means of Refining and Modification
Autorzy:
Tupaj, M.
Orłowicz, A. W.
Trytek, A.
Mróz, M.
Powiązania:
https://bibliotekanauki.pl/articles/379844.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al-Si alloy
fatigue limit
refining
modification
stop Al-Si
granica zmęczenia
rafinacja
modyfikacja
Opis:
The paper presents results of a study concerning an AlSi7Mg alloy and the effect of subjecting the liquid metal to four different processes: conventional refining with hexachloroethane; the same refining followed by modification with titanium, boron, and sodium; refining by purging with argon carried out in parallel with modification with titanium and boron salts and strontium; and parallel refining with argon and modification with titanium, boron, and sodium salts. The effect of these four processes on compactness of the material, parameters of microstructure, and fatigue strength of AlSi7Mg alloy after heat treatment. It has been found that the highest compactness (the lowest porosity ratio value) and the most favorable values of the examined parameters of microstructure were demonstrated by the alloy obtained with the use of the process including parallel purging with argon and modification with salts of titanium, boron, and sodium. It has been found that in the fatigue cracking process observed in all the four variants of the liquid metal treatment, the crucial role in initiation of fatigue cracks was played by porosity. Application of the process consisting in refining by purging with argon parallel to modification with Ti, B, and Na salts allowed to refine the microstructure and reduce significantly porosity of the alloy extending thus the time of initiation and propagation of fatigue cracks. The ultimate effect consisted in a distinct increase of the fatigue limit value.
Źródło:
Archives of Foundry Engineering; 2019, 4; 61-66
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fatigue Properties of AlSi7Mg Alloy with Diversified Microstructure
Autorzy:
Tupaj, M.
Orłowicz, A. W.
Mróz, M.
Trytek, A.
Powiązania:
https://bibliotekanauki.pl/articles/380962.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
AlSi7Mg03 alloy
alloy refining
alloy modification
cooling rate
microstructure parameter
fatigue strength
stop AlSi7Mg03
rafinacja stopu
modyfikacja stopu
szybkość chłodzenia
parametr mikrostrukturalny
wytrzymałość zmęczeniowa
Opis:
The paper discusses the effect of microstructure on the fatigue strength of AlSi7Mg casting alloy refined conventionally with hexachloroethane without modifying and modified with TiB and Na. Castings made of both alloy variants were subjected to T6 heat treatment. It turned out that the applied refining secured satisfactory compactness of the material. In view of absence of gas and shrinkage porosity in the castings, short cracks nucleated on largest silicon precipitates and largest intermetallic phase precipitations as these were the locations where stress concentrations reached their highest values. Comprehensive modification of the alloy resulted in reduction of the value of SDAS parameter characterizing α(Al) phase dendrites, a decrease of the distance between silicone precipitates in the eutectic λE, and a decrease of the maximum size of silicone precipitates lmaxSi. The ultimate effect of these changes was an increase of the fatigue strength.
Źródło:
Archives of Foundry Engineering; 2015, 15, 3 spec.; 87-90
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Coefficients of the GTAW Process
Autorzy:
Orłowicz, A. W.
Trytek, A.
Tupaj, M.
Mróz, M.
Powiązania:
https://bibliotekanauki.pl/articles/383027.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermal efficiency
remelting process
flow calorimeter
sprawność cieplna
przetapianie
kalorymetr przepływowy
Opis:
The paper presents a discussion on the issue of thermal efficiency of the process of superficial remelting of castings by means of the gas tungsten arc welding (GTAW) process. Described and characterized are calorimeters used in research studies on efficiency of welding processes and the obtained results. Example results are presented from the measurements aimed at determination of thermal efficiency of the welding process carried out with the use of the flow calorimeter.
Źródło:
Archives of Foundry Engineering; 2015, 15, 3 spec.; 63-68
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Materials Used in the Automotive Industry
Autorzy:
Orłowicz, A. W.
Mróz, M.
Tupaj, M.
Trytek, A.
Powiązania:
https://bibliotekanauki.pl/articles/383174.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
automotive industry
foundry material
casting technique
przemysł motoryzacyjny
materiał odlewniczy
technika odlewnicza
Opis:
Elaborated shapes of many car components are the reason for which the use of casting techniques to fabricate them is a solution wellfounded from the economical point of view. Currently applicable regulatory requirements concerning emissions of exhaust fumes force the carmakers to reduce the overall weight of their products, as this is a basic precondition for reducing fuel consumption. As a result, newly launched car models contain a continuously increasing share of thin-walled castings made of materials which ensure a satisfactory level of service properties. At the same time, developing new technological processes allowing to extend the service life of individual components by means of surface improving becomes more and more important.
Źródło:
Archives of Foundry Engineering; 2015, 15, 2; 75-78
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of Eutectoid Transformation Temperatures in Ductile Cast Iron
Autorzy:
Orłowicz, A. W.
Trytek, A.
Mróz, M.
Tupaj, M.
Powiązania:
https://bibliotekanauki.pl/articles/380051.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ductile cast iron
eutectoid transformation
cooling rate
żeliwo sferoidalne
przemiana eutektoidalna
szybkość chłodzenia
Opis:
The paper proposes a methodology useful in verification of results of dilatometric tests aimed at determination of temperatures defining the start and the end of eutectoid transformation in the course of ductile cast iron cooling, based on quenching techniques and metallographic examination. For an industrial melt of ductile cast iron, the effect of the rate of cooling after austenitization at temperature 900°C carried out for 30 minutes on temperatures TAr1 start and TAr1end was determined. The heating rates applied in the study were the same as the cooling rates and equaled 30, 60, 90, 150, and 300°C/h. It has been found that with increasing cooling rate, values of temperatures TAr1start and TAr1end decrease by several dozen degrees.
Źródło:
Archives of Foundry Engineering; 2015, 15, 4; 51-54
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Shaping the Microstructure of Cast Iron Automobile Cylinder Liners Aimed at Providing High Service Properties
Autorzy:
Orłowicz, A. W.
Mróz, M.
Tupaj, M.
Trytek, A.
Powiązania:
https://bibliotekanauki.pl/articles/381241.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cast iron
automobile cylinder
service properties
żeliwo
cylinder samochodowy
właściwości użytkowe
Opis:
The paper presents an analysis of factors affecting the wear of cylinder liners. The effect of the graphite precipitation morphology on the cylinder liner wear mechanism is presented. Materials used to cast cylinder liners mounted in a number of engines have been examined for their conformity with requirements set out in applicable Polish industrial standard. A casting for a prototype cylinder liner has been made with a microstructure guaranteeing good service properties of the part.
Źródło:
Archives of Foundry Engineering; 2015, 15, 2; 79-84
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Refining and the Cooling Rate on Microstructure and Mechanical Properties of AlSi7Mg Alloy
Autorzy:
Tupaj, M.
Orłowicz, A. W.
Mróz, M.
Trytek, A.
Powiązania:
https://bibliotekanauki.pl/articles/381386.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
AlSi7Mg alloy
material compactness
microstructure parameter
mechanical properties
stop AlSi7Mg
zwięzłość materiału
właściwości mechaniczne
Opis:
The paper presents results of research on the effect of conventional refining with hexachloroethane and the cooling rate vcool. ranging within the solidification temperature regime from 12.5°C/min to 94.5°C/min on compactness of the material, values of microstructure parameters λ2D, λE, lmaxSi, and mechanical properties Rm, R0,2, A5 of unmodified AlSi7Mg alloy after heat treatment (solution treatment 540°C/6 h/water 20°C and aging 175°C/8 h/air). It has been found that as a result of refining and increased cooling rate, an improvement of material compactness occurred (reduction of the density index by 0.4%) accompanied by a decrease of values of parameters characterizing the microstructure: λ2D by 54.4 μm; λE by 4,6 μm; and lmaxSi by 50 μm. As a result of these changes, the value of Rm increased by about 40 MPa and R0.2 improved by about 36 MPa, while the value of A5 decreased by 1.3%.
Źródło:
Archives of Foundry Engineering; 2015, 15, 3 spec.; 83-86
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Materials Properties of Iron-rich Intermetallic Phase in a Multicomponent Aluminium-Silicon Alloy
Autorzy:
Tupaj, M.
Orłowicz, A. W.
Mróz, M.
Trytek, A.
Powiązania:
https://bibliotekanauki.pl/articles/381828.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
alloys Al-Si
intermetallics phase
Fe-rich
primary crystals
silicon
stopy Al-Si
faza międzymetaliczna
wzbogacanie żelazem
kryształy pierwotne
krzem
Opis:
Available technical literature includes a number of reports on harmful effects connected with elevated content of iron in aluminium-silicon alloys but in case of pressure castings, alloys containing up to 2% Fe can be used. This follows from lesser susceptibility of such alloys to sticking to surfaces of metal moulds. One effect of iron presence in aluminium-silicon alloys is precipitation of iron-rich intermetallic phases. In the study reported in this paper it has been found that in a multicomponent aluminium-silicon alloy, the indentation hardness (HIT) and the elastic indentation modulus (EIT) of intermetallic phases occurring in the form of polyhedrons and/or their conglomerates, rich in aluminium, iron, silicon, manganese, and chromium, containing also copper, nickel, and vanadium, are higher than those measured for silicon crystals. This feature can be used to intentional modelling microstructure of mechanical parts which are expected to show high resistance to abrasive wear.
Źródło:
Archives of Foundry Engineering; 2015, 15, 1 spec.; 111-114
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improvement of Resistance of Cast-iron Heat Exchangers to High-temperature Corrosion
Autorzy:
Orłowicz, A. W.
Tupaj, M.
Trytek, A.
Mróz, M.
Radoń, M.
Jacek, M.
Powiązania:
https://bibliotekanauki.pl/articles/383068.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat exchangers
metallic coating
resistance to corrosion
high-temperature corrosion
wymienniki ciepła
powłoka metaliczna
odporność na korozję
korozja wysokotemperaturowa
Opis:
The paper discusses the possibility of improving resistance of heat exchangers made of gray cast iron with flake graphite to high-temperature corrosion by providing them with metallic coatings. A metallic coating containing 76.9% Ni, 19.8% Cr, 1.7% Si, 0.9% Fe, and 0.9% Mn was applied by means of the plasma spraying method and subjected to cyclically variable thermal loads in the atmosphere of solid fuels combustion products (oxygen, sulfur, chlorine, and sodium). In a 30-day thermal load test held at temperature 500°C it has been found that thickness of the metallic coating decreased from the initial (240 ± 6) μm to (231 ± 6) μm. The depth to which sulfur, chlorine, and sodium penetrated the coating was about 30 μm. Increased oxygen content occurred along the whole coating depth. In the coating area adjacent to the substrate surface, the content was twice as high compared to this observed in the initial coating material. Although presence of oxygen was found within the whole depth of the coating, i.e. (231 ± 6) μm, no signs of susceptibility of the sprayed metallic layer to separation from substrate of gray cast iron with flake graphite were found.
Źródło:
Archives of Foundry Engineering; 2018, 18, 3; 49-52
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 25

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