Autor: Mocek, J. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: The Formation of Gaseous Atmosphere in a Molten Cast Iron/MouldingSand Contact System
Autorzy:: Mocek, J.
Powiązania:: https://bibliotekanauki.pl/articles/382409.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: moulding sand
cast iron melt
gas in metal
mould atmosphere
masa formierska
żeliwo
Opis:: Drops of molten cast iron were placed on moulding sand substrates. The composition of the forming gaseous atmosphere was examined. It was found that as a result of the cast iron contact with water vapour released from the sand, a significant amount of hydrogen was evolved. In all the examined moulding sands, including sands without carbon, a large amount of CO was formed. The source of carbon monoxide was carbon present in cast iron. In the case of bentonite moulding sand with sea coal and sand bonded with furan resin, in the composition of the gases, the trace amounts of hydrocarbons, i.e. benzene, toluene, styrene and naphthalene (BTX), appeared. As the formed studies indicate much higher content of BTX at lower temperature it was concluded that the hydrocarbons are unstable in contact with molten iron.
Źródło:: Archives of Foundry Engineering; 2014, 14, 1; 79-84
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Multiparameter Assessment of the Gas Forming Tendency of Foundry Sands with Alkyd Resins
Autorzy:: Mocek, J.
Powiązania:: https://bibliotekanauki.pl/articles/383265.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: gases
moulding sand
casting defects
cast iron
pressure
gazy
masa formierska
żywice alkidowe
wady odlewnicze
żeliwo
Opis:: Gas atmosphere at the sand mould/cast alloy interface determines the quality of the casting obtained. Therefore the aim of this study was to measure and evaluate the gas forming tendency of selected moulding sands with alkyd resins. During direct and indirect gas measurements, the kinetics of gas evolution was recorded as a function of the temperature of the sand mixture undergoing the process of thermal destruction. The content of hydrogen and oxygen was continuously monitored to establish the type of the atmosphere created by the evolved gases (oxidizing/reducing). The existing research methodology [1, 7, 8] has been extended to include pressure-assisted technique of indirect measurement of the gas evolution rate. For this part of the studies, a new concept of the measurement was designed and tested. This article presents the results of measurements and compares gas emissions from two sand mixtures containing alkyd resins known under the trade name SL and SL2002, in which the polymerization process is initiated with isocyanate. Studies of the gas forming tendency were carried out by three methods on three test stands to record the gas evolution kinetics and evaluate the risk of gas formation in a moulding or core sand. Proprietary methods for indirect evaluation of the gas forming tendency have demonstrated a number of beneficial aspects, mainly due to the ability to record the quantity and composition of the evolved gases in real time and under stable and reproducible measurement conditions. Direct measurement of gas evolution rate from the tested sands during cast iron pouring process enables a comparison of the results with the results obtained by indirect methods.
Źródło:: Archives of Foundry Engineering; 2019, 2; 41-48
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

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

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Skocz do pozycji: 4.

Tytuł:: Destruction of Moulding Sands with Chemical Binders Caused by the Thermal Radiation of Liquid Metal
Autorzy:: Zych, J.
Mocek, J.
Powiązania:: https://bibliotekanauki.pl/articles/382547.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: sand mould
thermal destruction
thermal radiation
heating of mould
loss of strength
masa formierska
rozkład termiczny
promieniowanie cieplne
Opis:: The obtained results of heating of sand moulds with binders by means of a thermal radiation of liquid metal are presented in this study. Standard samples for measuring R_g made of the tested moulding sands were suspended at the lower part of the cover which was covering the crucible with liquid metal (cast iron), placed in the induction furnace. The authors own methodology was applied in investigations. The progressing of the samples surface layers heating process was determined as the heating time function. Samples of a few kinds of moulding sands with chemical binders were tested. Samples without protective coatings as well as samples with such coatings were tested. The influence of the thermal radiation on bending resistance of samples after their cooling was estimated. The influence of several parameters such as: time of heating, distance from the metal surface, metal temperature, application of coatings, were tested. A very fast loss of strength of moulding sands with organic binders was found, especially in cases when the distance between metal and sample surfaces was small and equaled to 10÷15 mm. Then, already after app. 15 seconds of the radiation (at T_met=1400°C), the resistance decreases by nearly 70%. Generally, moulding sands with organic binders are losing their strength very fast, while moulding sands with water glass at first increase their strength and later slightly lose. The deposition of protective coatings increases the strength of the mould surface layers, however does not allow to retain this strength after the metal thermal radiation.
Źródło:: Archives of Foundry Engineering; 2015, 15, 4; 95-100
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Kinetics of Gas Emission from Heated Moulding Sands Together with the On-line Assessment of H₂ and O₂ Fractions - New Investigation Method
Autorzy:: Mocek, J.
Zych, J.
Powiązania:: https://bibliotekanauki.pl/articles/379867.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: gas emission
evolution rate
hydrogen content
oxygen content
moulding sand
resin
burning
moulding sand destruction
emisja gazu
tempo rozwoju
zawartość wodoru
zawartość tlenu
masa formierska
żywica
spalanie
Opis:: The new investigation method of the kinetics of the gas emission from moulding sands used for moulds and cores is presented in this paper. The gas evolution rate is presented not only as a function of heating time but also as a function of instantaneous temperatures. In relation to the time and heating temperature the oxygen and hydrogen contents in evolving gases was also measured. This method was developed in the Laboratory of Foundry Moulds Technology, Faculty of Foundry Engineering, AGH. Gas amounts which are emitted from the moulding sand at the given temperature recalculated to the time unit (kinetics) are obtained in investigations. Results of investigations of moulding sand with furan resin are presented - as an example - in the paper.
Źródło:: Archives of Foundry Engineering; 2016, 16, 4; 79-84
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Effect of atmosphere in a foundry mould on casting surface quality
Autorzy:: Chojecki, A.
Mocek, J.
Powiązania:: https://bibliotekanauki.pl/articles/382388.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: forma piaskowa
wada powierzchni odlewu
stężenie wodoru
żeliwo sferoidalne
sand mould
defects on casting surface
hydrogen concentration
ductile iron
Opis:: Changes of gas pressure in the moulding sand in the zone adjacent to mould cavity were analysed during pouring of cast iron. No significant effect of pressure on the surface quality of castings was observed. In the second series of tests, the concentration of hydrogen in the gas atmosphere was measured. It has been found that the value of this concentration depends on metal composition and is particularly high in cast iron containing magnesium. This is due to the reduction of water vapour with the element that has high affinity to oxygen. The presence of hydrogen causes the formation of gas-induced defects on the casting surface.
Źródło:: Archives of Foundry Engineering; 2012, 12, 1; 13-18
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Studies of gas atmosphere near the metal-mould interface during casting and solidification of ductile iron
Autorzy:: Mocek, J.
Chojecki, A.
Powiązania:: https://bibliotekanauki.pl/articles/380414.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: żeliwo sferoidalne
emisja gazu
powierzchnia odlewu
ductile iron
metal mould interface
gas evolution
surface of castings
Opis:: In sand moulds, at a distance of 3 mm from the metal-mould interface, the sensors of temperature, and of oxygen and hydrogen content were installed. Temperature and the evolution of partial gas pressure have been analysed in moulds bonded with bentonite with or without the addition of seacoal, water glass or furan resin. Moulds were poured with ductile iron. For comparison, also tests with the grey iron have been executed. It was found that the gas atmosphere near the interface depends mainly on the content of a carbonaceous substance in the mould. In the green sand moulds with 5% of seacoal or bonded with furan resin, after the mould filling, a sudden increase in the hydrogen content and the drop of oxygen is observed. This gas evolution results from the oxidation of carbon and reduction of water vapour in the mould material, and also from the reduction of water vapour and alloy reoxidation. In carbon-free sand, the evolution in the gas composition is slower because water vapour is reduced only at the interface. Changes of oxygen and hydrogen content in the controlled zone are determined by the transport phenomena.
Źródło:: Archives of Foundry Engineering; 2012, 12, 4; 166-170
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Gas Atmosphere Formed in Casting by Full Mold Process
Atmosfera gazowa występująca podczas wykonywania odlewów w technologii pełnej formy
Autorzy:: Mocek, J.
Chojecki, A.
Powiązania:: https://bibliotekanauki.pl/articles/350844.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: casting
full mold
formation of the gap
odlew
pełna forma
powstawanie szczelin
Opis:: A test mold was designed to investigate the full mold process. Pressure changes in a gap developing between the pattern made of foamed polystyrene and the raising column of liquid alloy were determined. Studies were conducted pouring molds with cast iron and with AK11 silumin. It was found that pressure is significantly higher in the case of cast iron, due to a higher rate of pattern decomposition and more advanced dissociation of hydrocarbons. The increase in pressure was observed to have no significant effect on changes in the pouring rate as it was compensated by higher metallostatic pressure. The increase of pressure occurs immediately after the start of pouring, it reaches a maximum and then stabilizes or decreases smoothly as a result of the drop in metallostatic pressure. The temperature of pouring has a significant effect on the decomposition rate of hydrocarbons evolving from the metal. During pouring of cast iron, the presence of hydrogen was revealed. It was particularly evident across the gas-permeable coating, where the concentration has exceeded 40%. Hydrogen precipitation was accompanied by an evolution on the casting surface of considerable amounts of pyrolytic carbon. It was found that gases forming in the gap were totally free from oxygen.
Zaprojektowano próbną formę do badania procesu full mold. Określono zmiany ciśnienia w szczelinie powstającej pomiędzy styrodurowym modelem a podnoszącym się ciekłym stopem. Badania prowadzono przy zalewaniu form żeliwem oraz siluminem AK11. Stwierdzono, że ciśnienie to jest znacznie wyższe w przypadku żeliwa, co wynika z większej szybkości rozpadu modelu i dalej posuniętej dysocjacji węglowodorów. Wzrost ciśnienia nie powoduje jednak istotnej zmiany szybkości zalewania, ponieważ jest on kompensowany wyższym ciśnieniem metalostatycznym. Wzrost ciśnienia następuje bezpośrednio po rozpoczęciu zalewania, osiąga ono maksimum poczem stabilizuje się lub łagodnie maleje w wyniku zmniejszania ciśnienia metalostatycznego. Temperatura zalewania ma istotny wpływ na stopień rozpadu, wydzielających się z modelu węglowodorów. Przy zalewaniu żeliwa stwierdzono obecność wodoru. Jest ona widoczna zwłaszcza po drugiej stronie powłoki gazoprzepuszczalnej gdzie stężenie sięga powyżej 40%. Wydzielaniu wodoru towarzyszy wydzielanie się na powierzchni odlewu, znacznych ilości pyrolitycznego węgla. Stwierdzono, że gazy tworzące szczelinę są całkowicie wolne od tlenu.
Źródło:: Archives of Metallurgy and Materials; 2014, 59, 3; 1045-1049
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Gas Generation Properties of Materials Used in the Sand Mould Technology – Modified Research Method
Autorzy:: Zych, J.
Mocek, J.
Snopkiewicz, T.
Powiązania:: https://bibliotekanauki.pl/articles/380142.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: moulding mass
materials used
research methodology
generation kinetics
masa formierska
materiały
metodologia badań
kinetyka
Opis:: The paper presents a new methodology for research on gas generation property of materials used for sand forms and cores, models made of foamed polystyrene, protective layers, etc. In the form of an example, full analysis has been presented of gas generation property of a selected furan resin bonded sand, stating the course and kinetics of gas generation, their intensity in the time function, and in the heating temperature function. The description is of quantitative nature. The existence of peaks in gas generation intensity was observed at several temperature values. The results are well-correlated with the inclination to form surface defects of casts made in furnace resin bonded sands. This is the first study on gas generation kinetics in the mass heating temperature function.
Źródło:: Archives of Foundry Engineering; 2014, 14, 3 spec.; 105-109
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Casting of Al-Si alloys in the full-mould technology. Process conditions
Odlewania stopów Al-Si w technologii pełnej formy. Uwarunkowania procesu
Autorzy:: Mocek, J.
Zych, J.
Krubnik, Ł.
Powiązania:: https://bibliotekanauki.pl/articles/264207.pdf
Data publikacji:: 2014
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: full-mould
strength
permeability
gas evolution tendency
coatings
pełna forma
powłoki
wytrzymałość
rozpuszczalność
gazotwórczość
Opis:: A review of various technologies using expendable casting patterns made of expanded polystyrene isgiven in the paper.The resultsof our own investigations on implementing this technology at the pilot-plant scale - for the art castings series - were presented. The results of tests of materials and moulds applied in the full-mould technology were shown. Gas evolution tendencies of expanded polystyrenes and protective coatings were estimated. Gas evolutions were described as functions of the polystyrene heating temperature. The tests of protective coatings used in this technology were performed and strength (R_m), permeability (P), and gas evolution tendency of these coatings assessed. New solutions developed by the team of researchers were applied in testing coating strength, permeability, and the gas evolution tendency of expanded polystyrene. A good correlation between the results of coating properties and the obtained casting quality was found. Coatings, which were characterised by higher strengths and better permeability, allowed us to produce castings without surface or inner faults.
Dynamiczny rozwój produkcji odlewów w technologii „pełnej formy" wymaga szybkiej optymalizacji procesu technologicznego dla nowych kształtów odlewów. Wykonanie dobrych odlewów wymaga starannego doboru odpowiednich materiałów formierskich. W tym celu zaproponowano metodykę pomiarową dla wybranych, podstawowych parametrów materiałów formierskich. Określono wytrzymałość powłokochronnych Rm, przepuszczalność powłok i gazotwórczość styropianu, jak również zaproponowano zmodyfikowaną wersję badań gazotwórczości materiałów dla modeli stosowanych w technologii„lost foam". Określono kinetykę wydzielania gazów w funkcji temperatury dla wybranej grupy spienionych polistyrenów. Stwierdzono dobrą korelację pomiędzy wytrzymałością i przepuszczalnością a uzyskiwaniem dobrych („zdrowych") odlewów. Powłoki cechujące się wysoką wytrzymałością i przepuszczalnością pozwalają na produkcję odlewów bez wad. Potwierdzono to, wykonując serię próbnych odlewów ze stopu Al-SI.
Źródło:: Metallurgy and Foundry Engineering; 2014, 40, 3; 161-174
1230-2325
2300-8377
Pojawia się w:: Metallurgy and Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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