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Wyświetlanie 1-13 z 13
Tytuł:
Effect of grain size of the reclaimed matrix ceramic moulds used in the lost wax technology on the strength at high temperature
Wpływ wielkości ziarna osnowy form ceramicznych stosowanych w technologii wytapianych modeli na ich wytrzymałość w stanie na wilgotno
Autorzy:
Kamińska, J.
Kolczyk, J.
Żymankowska-Kumon, S.
Powiązania:
https://bibliotekanauki.pl/articles/263805.pdf
Data publikacji:
2010
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
odlewnictwo
forma ceramiczna
osnowa
temperatura
foundry
ceramic mould
matrix
temperature
Opis:
Production technology of investment casting involves transmitting the elements of shape, dimensions and properties by filling in the appropriate liquid metal ceramic forms reproduccd by a model made of wax removed by melting it. The manufacturing process of investment casting in the lost wax technology consists of a number of technological operations: preparing of wax models and their assembling in the model units, the preparation of ceramic mixture, successive layers of debris, wax melting in an autoclave, drying the samples at 100 °C, heating the samples at temperatures ranging from 400 to 700 °C. So far, the technology was based on the use of ceramic mixture, which the bond was hydrolysed ethyl silicate. Currently, due to environmental protection and improvement of working conditions, more and more binders with alcohol is replaced with an aqueous solution of colloidal silica. In the study, as the basic of individual layers a ceramic form, used regenerated ceramic mixture derived from foundry and green ingredients. Used ceramic moulds after mechanical reclamation was given to sieve analysis to determine the grain size (dL). Grain sizes 0.2, 0.4 and 0.63 mm were used for the coating of ceramic moulds. The paper presents results of research aimed at the determination of the relationship between tensile wet strength and grain size of ceramic mould: Rm =f(dL). Tests were conducted on cylindrical samples, which deposited a layer of reclaimed ceramic material.
Technologia wytwarzania precyzyjnych odlewów polega na nadawaniu elementom kształtu, wymiarów i odpowiednich własności poprzez wypełnienie ciekłym metalem formy ceramicznej odtworzonej przez model wykonany z wosku, usuwany z niej metodą wytapiania. Proces wytwarzania odlewów precyzyjnych w technologii wytapianych modeli składa się z szeregu operacji technologicznych obejmujących: wykonanie modeli woskowych i ich łączenie w zespoły modelowe, przygotowanie masy ceramicznej, nanoszenie kolejnych warstw, wytopienie wosku w autoklawie, suszenie próbek w temperaturze 100 °C, wygrzewanie próbek w zakresie temperatury od 400 do 700 °C. Dotychczasowa technologia oparta była na stosowaniu mas ceramicznych, w których spoiwem był zhydrolizowany krzemian etylu. Aktualnie, ze względu na ochronę środowiska i poprawę warunków pracy, coraz częściej spoiwo z alkoholem zastępowane jest wodnym roztworem krzemionki koloidalnej. W badaniach, jako osnowę poszczególnych warstw formy ceramicznej, stosowano zregenerowaną masę ceramiczną pochodzącą z odlewni precyzyjnej, oraz osnowę świeżą. Masę po regeneracji mechanicznej poddano analizie sitowej w celu określenia wielkości ziarna dL. Ziarna o wielkości 0.2; 0.4 i 0.63 mm użyto do wykonywania powłok form ceramicznych. W artykule przedstawiono wyniki badań ukierunkowanych na wyznaczeniu zależności pomiędzy wytrzymałością na rozciąganie w stanie na wilgotno i wielkością ziarna osnowy formy ceramicznej: Rm = f(dL). Badania zostały przeprowadzone na próbkach w kształcie walca o powierzchni dzielonej, na które nanoszono warstwy z zregenerowanej masy ceramicznej, jak również ze świeżej osnowy.
Źródło:
Metallurgy and Foundry Engineering; 2010, 36, 1; 31-35
1230-2325
2300-8377
Pojawia się w:
Metallurgy and Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dependence of tensile wet strength from regeneration time and grain size of the matrix ceramic moulds
Zależność wytrzymałości form ceramicznych w stanie na wilgotno od czasu regeneracji i wielkości ziarna osnowy
Autorzy:
Kamińska, J.
Kolczyk, J.
Żymankowska-Kumon, S.
Powiązania:
https://bibliotekanauki.pl/articles/263884.pdf
Data publikacji:
2011
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
odlewnictwo
forma ceramiczna
osnowa
temperatura
foundry
ceramic mould
matrix
temperature
Opis:
Production technology of nwestment casting involves transmitting the elements of shape, dimensions and properties by filling in the appropriate liquid metal ceramic forms reproduced by a model made of wax removed by melting it. The manufacturing process of inwestment casting in the lost wax technology consists of a number of technological operations: preparing of wax models and their assembling in the model units, the preparation of ceramic mixture, successive layers of debris, wax melting in an autoclave, drying the samples at 100 °C, heating the samples at temperatures ranging from 400 to 700 °C. So far, the technology was based on the use of ceramic mixture, which the bond was hydrolysed ethyl silicate. Currently, due to environmental protection and improvement of working conditions, more and more binders with alcohol is replaced with an aqueous solution of colloidal silica. In the study, to create the individual layers a ceramic form, used regenerated ceramic mixture derived from foundry and green ingredients. The regeneration time was respectively 5 and 15 minutes. Used ceramic moulds after mechanical reclamation was given to sieve analysis to determine the grain size (di). Grain sizes 0.2, 0.4 and 0.63 mm were used for the coating of ceramic moulds. The paper presents results of research aimed at the determination of the relationship between tensile wet strength and grain size of ceramic mould: Rm = f[dL). Tests were conducted on cylindrical samples, which deposited the layers of reclaimed ceramic material.
Technologia wytwarzania precyzyjnych odlewów polega na nadawaniu elementom kształtu, wymiarów i odpowiednich własności poprzez wypełnienie ciekłym metalem formy ceramicznej odtworzonej przez model wykonany z wosku, usuwany z niej metodą wytapiania. Proces wytwarzania odlewów precyzyjnych w technologii wytapianych modeli składa się z szeregu operacji technologicznych obejmujących: wykonanie modeli woskowych i ich łączenie w zespoły modelowe, przygotowanie masy ceramicznej, nanoszenie kolejnych warstw, wytopienie wosku w autoklawie, suszenie próbek w temperaturze 100 °C, wygrzewanie próbek w zakresie temperatury od 400 do 700 °C. Dotychczasowa technologia oparta była na stosowaniu mas ceramicznych, w których spoiwem był zhydrolizowany krzemian etylu. Aktualnie, ze względu na ochronę środowiska i poprawę warunków pracy, coraz częściej spoiwo z alkoholem zastępowane jest wodnym roztworem krzemionki koloidalnej. W badaniach do tworzenia warstw formy ceramicznej stosowano osnowy pochodzące ze zużytych form z odlewni precyzyjnej poddanych regeneracji oraz osnowę świeżą. Czas regeneracji wynosił odpowiednio 5 i 15 minut. Masę po regeneracji mechanicznej poddano analizie sitowej w celu określenia wielkości ziarna dL. Ziarna o wielkości 0,2; 0,4 i 0,63 mm użyto do wykonywania warstw form ceramicznych. W artykule przedstawiono wyniki badań ukierunkowanych na wyznaczeniu zależności pomiędzy wytrzymałością na rozciąganie w stanie na wilgotno i wielkością ziarna osnowy formy ceramicznej: Rm =f(dL). Badania zostały przeprowadzone na próbkach w kształcie walca o powierzchni dzielonej, na które nanoszono warstwy z wykorzystaniem osnowy pochodzącej z regeneracji, jak również ze świeżej osnowy.
Źródło:
Metallurgy and Foundry Engineering; 2011, 37, 1; 53-61
1230-2325
2300-8377
Pojawia się w:
Metallurgy and Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of Higher Temperature on Quartz Moulding Sand with Gypsum Binders
Autorzy:
Paduchowicz, P.
Stachowicz, M.
Granat, K.
Powiązania:
https://bibliotekanauki.pl/articles/382554.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry
building gypsum
gypsum putty
pH
LOI
odlewnictwo
gips
spoiwo gipsowe
Opis:
This paper presents initial findings from research into the possibility of using gypsum binders in quartz moulding sand that could be used in the production of casting moulds and cores. For the purposes of the research two commercial types of gypsum were used as binders: building gypsum and gypsum putty. Dry components of moulding sand i.e. medium quartz sand and gypsum were mixed in proportion of 89/11 parts by weight. In order to achieve bonding properties for the binders, 5 parts by weight of water was added to the mixture of dry components. After 24 hours of adding water and mixing all the components, the moulding sand, naturally hardened, was subjected to high temperature. The moulding sand thus produced, i.e. with cheap and environmentally-friendly gypsum binders, was eventually analysed after heating (at temperatures of 300oC, 650oC and 950oC) and cooling in order to determine changes in the following parameters: LOI – loss on ignition, chemical composition and pH. Moreover, investigated were bonding bridges, before and after the moulding sand was roasted. The research results revealed differences in the structure of bonding bridges and the occurrence of automatic adhesive destruction for both types of gypsum binders. For two types of moulding sands under the investigation of the LOI exceeded 2.59wt.% (with building gypsum) or 2.84wt.% (with putty gypsum) and pH increased to ca. 12 as a result of increasing roasting temperature from 300oC to 650oC. Next, roasting at 950oC decrease value of LOI in both types of moulding sands. Moulding sand with builoding gypsum roasted at 950oC revealed a return to the value of pH parameter measured prior to annealing.
Źródło:
Archives of Foundry Engineering; 2018, 18, 1; 81-86
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Implementation of Nanoparticles in Materials Applied in Foundry Engineering
Autorzy:
Kmita, A.
Roczniak, A.
Powiązania:
https://bibliotekanauki.pl/articles/381634.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovative technologies
nanoparticles
materials
foundry
innowacyjne technologie
nanocząsteczki
materiały odlewnicze
odlewnictwo
Opis:
The ceaseless progress of nanotechnology, observed in the last years, causes that nanomaterials are more and more often applied in several fields of industry, technique and medicine. E.g. silver nanoparticles are used in biomedicine for disinfection and polymer nanoparticles allow insulin transportation in pharmacology. New generation materials containing nanoparticles are also used in the chemical industry (their participation in the commercial market equals app. 53 %). Nanomaterials are used in electronics, among others for semiconductors production (e.g. for producing nanoink Ag, which conducts electric current). Nanomaterials, due to their special properties, are also used in the foundry industry in metallurgy (e.g. metal alloys with nanocrystalline precipitates), as well as in investment casting and in moulding and core sand technologies. Nanoparticles and containing them composites are applied in several technologies including foundry practice, automotive industry, medicine, dentistry etc. it is expected that their role and market share will be successively growing.
Źródło:
Archives of Foundry Engineering; 2017, 17, 3; 205-209
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of Core Sands Properties in Blowing Process
Autorzy:
Dańko, R.
Powiązania:
https://bibliotekanauki.pl/articles/381670.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry
core
blowing process
core sand
odlewnictwo
rdzeń odlewniczy
masa rdzeniowa
Opis:
The effects of filling the core box cavity and sand compaction in processes of core production by blowing methods (blowing, shooting) depend on several main factors. The most important are: geometrical parameters of cavity and complexity of its shape, number, distribution and shape of blowing holes feeding sands as well as the venting of a technological cavity. Values of individual parameters are selected according to various criteria, but mostly they should be adjusted to properties of the applied core sand. Various methods developed by several researchers, including the authors own attempts, allow to assess core sands properties on the basis of special technological tests projecting the process into a laboratory scale. The developed criteria defining a degree or a filling ability factor provide a better possibility of assessing the core sand behaviour during flowing and core box filling, which indicate the value and structure of the obtained compacting decisive – after hardening – for strength and permeability. The mentioned above aspects are analysed – on the basis of authors’ own examinations - in the hereby paper.
Źródło:
Archives of Foundry Engineering; 2015, 15, 2 spec.; 13-16
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the Microwave Absorbing Effectiveness by the Selected Molding Sands Matrixes
Autorzy:
Stachowicz, M.
Granat, K.
Więcławek, R.
Powiązania:
https://bibliotekanauki.pl/articles/382514.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry
microwaves
quartz sand
absorption
water
odlewnictwo
mikrofale
piasek kwarcowy
absorpcja
woda
Opis:
The paper presents the results of the absorption effectiveness measured for electromagnetic waves with a frequency of 2.45 GHz penetrating selected quartz mold and core sands matrixes. Research was conducted with a usage of the unique microwave slot line for assessing, on the basis of the measured parameters of looseness, the effectiveness of microwaves absorbing capacity by the matrixes of molding sands. Examinations were focused on the high-silica quartz matrixes from various mines with a different grain size composition and humidity. Usage of the unique measuring device, designed especially for this type of research, has made possibility to systematize knowledge of the dynamics and efficiency of microwaves absorption while penetrating humid matrix of molding sands. Analysis of the study results indicate, that the process of microwaves absorbing is affect, in addition to water located on the matrix grains surfaces, by the grain size distribution and the origin of the quartz sand.
Źródło:
Archives of Foundry Engineering; 2013, 13, 1 spec.; 175-180
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Overview of activities on the internet devoted to casting technology
Autorzy:
Wilk-Kołodziejczyk, D.
Regulski, K.
Dziaduś-Rudnicka, J.
Kluska-Nawarecka, S.
Powiązania:
https://bibliotekanauki.pl/articles/382912.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
komponent wiedzy
proces produkcyjny
odlewnictwo
metalurgia
media społecznościowe
wyszukiwanie internetowe
odlewnictwo metali
technologia odlewnicza
knowledge components
production process
foundry
metallurgy
social media
searching on internet
metal casting
casting technology
Opis:
Article present various forms of transfer of information available on the Internet. An attempt was made to show the possibility of such a selection of the knowledge sources that, taking into account user preferences, would arouse his interest, showing in parallel the intended substantive content. This commitment is shown in the context of the current assumptions of building a platform dedicated to support the needs of production processes in foundry and metallurgy.
Źródło:
Archives of Foundry Engineering; 2012, 12, 2; 245-250
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The analysis of the influence of the polystyrene patterns shaping parameters on the resistance properties
Autorzy:
Pacyniak, T.
Buczkowska, K.
Bogus, W.
Powiązania:
https://bibliotekanauki.pl/articles/382906.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
odlewnictwo
tracona piana
styropianowy model odlewniczy
odlew
foundry
lost foam
polystyrene patterns
casts
Opis:
This work presents the technology of making foam plastics patterns used in casting as well as the final shaping stand. The analysis of the sintering process was carried out aiming at determining the influence of the pressure and the time of sintering on the flexural strength properties. The analysis of the research results confirmed that when the sintering pressure grows to the value of Pa =1,7 bar the flexural strength also increases, when the pressure value is higher than that, the degradation of the material takes place and the strength properties decrease.
Źródło:
Archives of Foundry Engineering; 2012, 12, 2; 227-234
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of the basic styrofoam patterns final shaping parameters on the resistance properties
Autorzy:
Pacyniak, T.
Buczkowska, K.
Powiązania:
https://bibliotekanauki.pl/articles/380452.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
odlewnictwo
tracona piana
styropianowy model odlewniczy
odlew
foundry
lost foam
polystyrene patterns
casts
Opis:
This work presents the analysis of the final shaping process of the patterns aimed at determining the influence of the pressure and the time of sintering on the resistance to bending. The analysis of the research results proved that when the pressure of the sintering rises and reaches Ps=2.1 bar the resistance to bending increases, above this level of the pressure the resistance value starts decreasing. The time of styrofoam sintering at which the highest bending resistance values were obtained is ts=90 s. When the sintering pressure is less than 2 bar prolongation of the time of sintering over 90 s causes a slight increase in the resistance, however, at higher pressures prolongation of the time of sintering causes submelting of the styrofoam pattern.
Źródło:
Archives of Foundry Engineering; 2012, 12, 4; 121-126
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Approximation of Ausferrite Content in the Compacted Graphite Iron with the Use of Combined Techniques of Data Mining
Autorzy:
Regulski, K.
Wilk-Kołodziejczyk, D.
Kacprzyk, B.
Gumienny, G.
Rojek, G.
Mrzygłód, B.
Powiązania:
https://bibliotekanauki.pl/articles/379587.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
information technologies
foundry
graphite irons
compacted
ausferrite
data mining
regression
odlewnictwo
technologie informacyjne
zagęszczanie
żeliwo grafitowe
Opis:
This article presents the methodology for exploratory analysis of data from microstructural studies of compacted graphite iron to gain knowledge about the factors favouring the formation of ausferrite. The studies led to the development of rules to evaluate the content of ausferrite based on the chemical composition. Data mining methods have been used to generate regression models such as boosted trees, random forest, and piecewise regression models. The development of a stepwise regression modelling process on the iteratively limited sets enabled, on the one hand, the improvement of forecasting precision and, on the other, acquisition of deeper knowledge about the ausferrite formation. Repeated examination of the significance of the effect of various factors in different regression models has allowed identification of the most important variables influencing the ausferrite content in different ranges of the parameters variability.
Źródło:
Archives of Foundry Engineering; 2017, 17, 3; 117-122
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of a liquid metal temperature on a thermal decomposition of a phenolic resin
Autorzy:
Holtzer, M.
Bobrowski, A.
Dańko, R.
Żymankowska-Kumon, S.
Kolczyk, J.
Powiązania:
https://bibliotekanauki.pl/articles/382247.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
environment protection
phenolic resin
BTEX compounds
alluminium
foundry
ochrona środowiska
żywica fenolowa
związki typu BTEX
aluminium
odlewnictwo
Opis:
Due to the presence of harmful substances in resins those mould sands may be hazardous to the natural environment and workers. The general assessment of harmfulness of sands used for molds and cores encompasses 2 basic points: emission of hazardous substances during processes of preparing sands, pouring mold with liquid metals (high temperatures), cooling and shaking-out; possibility of washing out hazardous substances from used sands to the environment, during storage or economic use outside foundries. We present the results of research on the emission of BTEX compounds from mould sands with phenolic resins during pouring liquid metal of different temperature (cast iron and Al alloy). The research was conducted according to the original method prepared by the authors, which has been used for years in cooperation with various foundries (Poland, abroad).
Źródło:
Archives of Foundry Engineering; 2013, 13, 2; 35-38
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computer Catalog and Semantic Search of Data in the Domain of Cast Iron Processing
Autorzy:
Rojek, G.
Regulski, K.
Wilk-Kołodziejczyk, D.
Kluska-Nawarecka, S.
Wawrzaszek, T.
Powiązania:
https://bibliotekanauki.pl/articles/381770.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
application of information technologies
foundry
semantic search
ontology
cast iron processing
zastosowanie technologii informacyjnych
odlewnictwo
obróbka żeliwa
Opis:
The aim of this study is to design and implement a computer system, which will allow the semantic cataloging and data retrieval in the field of cast iron processing. The intention is to let the system architecture allow for consideration of data on various processing techniques based on the information available or searched by a potential user. This is achieved by separating the system code from the knowledge of the processing operations or from the chemical composition of the material being processed. This is made possible by the creation and subsequent use of formal knowledge representation in the form of ontology. So, any use of the system is associated with the use of ontologies, either as an aid for the cataloging of new data, or as an indication of restrictions imposed on the data which draw user attention. The use of formal knowledge representation also allows consideration of semantic meaning, a consequence of which may be, for example, returning all elements in subclasses of the searched process class or material grade.
Źródło:
Archives of Foundry Engineering; 2017, 17, 2; 79-84
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Automatic Core Shooting Parameters in Hot-Box Technology on the Strength of Sodium Silicate Olivine Moulding Sands
Autorzy:
Stachowicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/382292.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry
sodium silicate
olivine sand
hot-box process
core shooting
odlewnictwo
krzemian sodu
piasek oliwinowy
proces hot-box
rdzeń
Opis:
The paper presents the results of preliminary research on the application of olivine moulding sands with hydrated sodium silicate containing 1.5 % wt. of binder to perform ecological casting cores in hot-box technology using a semi-automatic core shooter. The following parameters were used in the process of core shooting: initial shot pressure of 6 bar, shot time 3 s, the temperature of the core-box: 200, 250 and 300°C and the core curing time: 30, 60, 90, 120 and 150 s. The matrix of the moulding mixture was olivine sand, and the binder of the sandmix was commercial, unmodified hydrated sodium silicate with molar module SiO2/Na2O of 2.5. In one shot of the automatic core-shooter were formed three longitudinal specimens (cores) with a dimensions 22.2×22.2×180 mm. The samples obtained in this way were subjected to the assessment of the influence of the shooting parameters, i.e. shooting time, temperature and curing time in core-box, using the following criteria: core box fill rate, mechanical strength to bending RgU, apparent density, compaction degree and susceptibility to friability of sand grains after hardening. The results of trials on the use of olivine moulding sands with hydrated sodium silicate (olivine SSBS) in the process of core shooting made it possible to determine the conditions for further research on the improvement of inorganic hot-box process technology aimed at: reduction of the heating temperature and the curing time. It was found that correlation between the parameters of the shooting process and the bending strength of olivine moulding sands with sodium silicate is observed.
Źródło:
Archives of Foundry Engineering; 2020, 20, 1; 67-72
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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