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    Wyświetlanie 1-9 z 9
    Tytuł:
    Microsegregation of Elements in Steel Composite Reinforced with Ceramic
    Autorzy:
    Medyński, D.
    Janus, A. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1837773.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    composite materials
    cast reinforced
    cast steel
    ceramic materials
    abrasive wear
    materiały kompozytowe
    staliwo zbrojone
    staliwo
    materiały ceramiczne
    zużycie ścierne
    Opis:
    The paper presents results of research on steel castings GX120Mn13 (L120G13 by PN-89/H-83160), zone-reinforced by elektrocorundum particles (Al2O3), with a grain size from 2 to 3.5 mm. Studies revealed continuity at interface between composite components and formation of a diffusion zone in the surface layer of electrocorundum grains. In the area of this zone, simple manganese segregation and reverse iron and chromium segregation were found. The transfer of these elements from cast steel to electrocorundum grains resulted superficial depletion in aluminum and oxygen in this area. No porosity was observed at the interface between two components of the composite. We found it very beneficial from an exploitation point of view, as confirmed by the study of resistance to abrasive wear.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 1; 63-66
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microsegregation of Elements in Steel Composite Reinforced with Ceramic
    Autorzy:
    Medyński, D.
    Janus, A. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1837854.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    composite materials
    cast reinforced
    cast steel
    ceramic materials
    abrasive wear
    materiały kompozytowe
    staliwo zbrojone
    staliwo
    materiały ceramiczne
    zużycie ścierne
    Opis:
    The paper presents results of research on steel castings GX120Mn13 (L120G13 by PN-89/H-83160), zone-reinforced by elektrocorundum particles (Al2O3), with a grain size from 2 to 3.5 mm. Studies revealed continuity at interface between composite components and formation of a diffusion zone in the surface layer of electrocorundum grains. In the area of this zone, simple manganese segregation and reverse iron and chromium segregation were found. The transfer of these elements from cast steel to electrocorundum grains resulted superficial depletion in aluminum and oxygen in this area. No porosity was observed at the interface between two components of the composite. We found it very beneficial from an exploitation point of view, as confirmed by the study of resistance to abrasive wear.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 1; 63-66
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of High-temperature Physicochemical Interactions Between the H282Alloy Melt and Ceramic Material of the Crucible
    Autorzy:
    Pirowski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/381394.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nickel alloys
    superalloys
    melting
    reactivity
    metal/ceramic reaction
    refractory materials
    stopy niklu
    nadstopy
    topienie
    reaktywność
    materiały ogniotrwałe
    Opis:
    Nickel alloys belong to the group of most resistant materials when used under the extreme operating conditions, including chemically aggressive environment, high temperature, and high loads applied over a long period of time. Although in the global technology market one can find several standard cast nickel alloys, the vast majority of components operating in machines and equipment are made from alloys processed by the costly metalworking operations. Analysis of the available literature and own studies have shown that the use of casting technology in the manufacture of components from nickel alloys poses a lot of difficulty. This is due to the adverse technological properties of these alloys, like poor fluidity, high casting shrinkage, and above all, high reactivity of liquid metal with the atmospheric air over the bath and with the ceramic material of both the crucible and foundry mold. The scale of these problems increases with the expected growth of performance properties which these alloys should offer to the user. This article presents the results of studies of physico-chemical interactions that occur between the H282 alloy melt and selected refractory ceramic materials commonly used in foundry. Own methodology for conducting micro-melts on a laboratory scale was elaborated and discussed. The results obtained have revealed that the alumina-based ceramic sexhibits greater reactivity in contact with the H282 alloy melt than the materials based on zirconium ompounds. In the conducted experiments, the ceramic materials based on zirconium silicate have proved to be a much better choice than the zirconia-silica mixture. Regardless of the type of the ceramic materials used, the time and temperature of their contact with the nickel alloy melt should always be limited to an absolutely necessary minimum required by the technological regime.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 4; 83-90
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rapid Prototyping Technology Using for Casting Process of Mini Turbine Runner
    Autorzy:
    Hościło, B
    Kaczyński, R.
    Skorulski, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/383216.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technologies
    innovative foundry materials
    rapid prototyping
    ceramic moulds
    miniturbine runner
    innowacyjne technologie odlewnicze
    innowacyjne materiały odlewnicze
    formy ceramiczne
    Opis:
    The previous mini-hydrogenator rotors’ prototypes were made of ABS thermoplastic material with use of fused deposition modelling (FDM). However, there is a need for such rotors made of metallic materials with higher strength. In paper three dimensional printing (3DP) as rapid prototyping technology, was presented, to execute a shell mould of rotor prototype. In initial phase, the moulds were prepared which allow to cast a simple geometric solid with different alloys, for comparative reasons. The form of rotor and testing cast moulds were designed using universal CAD environment and printed composite using material zp151 (Calcium sulfate hemihydrate) with a binder zb63 (2- pyrrolidone) for preparation of colourful presentation models or casting models. The suitability of technology usage with alloys of copper , aluminium and zinc, was analyzed. The strength of the mould during casting, a material resistant to high temperature, the quality of received casting and its surface roughness were assumed as the comparative parameters which characterized method.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 1 spec.; 83-86
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    3DP Technology for the Manufacture of Molds for Pressure Casting
    Autorzy:
    Skorulski, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/383141.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative materials
    innovative casting technologies
    rapid prototyping
    ceramic mold
    pressure casting
    materiały innowacyjne
    innowacyjne technologie odlewnicze
    prototypy
    formy ceramiczne
    odlewanie ciśnieniowe
    Opis:
    The paper presents the use of rapid prototyping technology of three dimensional printing (3DP) to make a prototype shell casting mold. In the first step, for identification purposes, a mold was prepared to enable different alloys to be cast. All molds being cast were designed in a universal CAD environment and printed with the zp151 composite material (Calcium sulfate hemihydrate) with a zb63 binder (2-pyrrolidone). It is designated to be used to prepare colourful models presenting prototypes or casting models and molds. The usefulness of 3DP technology for use with copper alloys, aluminum and zinc was analyzed. The strength of the mold during casting was assumed as a characteristic comparative feature in the material resistance to high temperature, the quality of the resulting casting and its surface roughness. Casting tests were carried out in vacuum – pressure casting. The casting programs applied, significantly increased the quality of castings and enabled precise mold submergence. Significant improvement was noted in the quality compared to the same castings obtained by gravity casting.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 3; 99-102
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the Selected Factors on the Ceramic Moulds Permeability Determined by the New Method
    Autorzy:
    Kolczyk, J.
    Zych, J.
    Jamrozowicz, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/382719.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technologies
    innovative foundry materials
    investment casting technology
    permeability
    ceramic moulds
    innowacyjne technologie odlewnicze
    materiały odlewnicze
    technologia odlewania
    przepuszczalność
    formy ceramiczne
    Opis:
    Ceramic moulds in the investment casting technology are made by depositing on the wax pattern subsequent layers of a liquid ceramic mass together with a granular matrix. A quality of castings depends on building of individual layers. The results of the ceramic moulds permeability obtained by means of the newly developed measuring method are presented in the hereby paper. Due to the applied solution it is possible to perform measurements also for the first layers which have the decisive influence on a permeability of the whole multilayer ceramic mould. Investigations of the influence of the matrix grain size and annealing temperature on the permeability of ceramic moulds were carried out.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 1 spec.; 55-60
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Analysis of Molding and Modification of the Ceramic Surfaces and Its Impact on the Roughness of Castings
    Autorzy:
    Jesiotr, M.
    Myszka, D.
    Trzaskowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/947458.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nickel coating
    roughness of casting surface
    aluminum alloys
    ceramic mold
    polymer materials
    powłoka niklowa
    chropowatość powierzchni
    stopy aluminium
    formy ceramiczne
    materiały polimerowe
    Opis:
    The article presents an analysis of changes in the outer surface of the casting made in a modified ceramic form. The introduction of the modification in the inner surface of the form, as a metallic coating was intended to produce a high quality of the casting surface. To describe the results, the three parameters have been chosen to characterize the surface roughness, i.e. Ra, Rz and Rq. In implementing the popular method of casting was used, so – called the lost polymer models. The models made from different plastic materials are chemically and electrochemically coated with a layer of nickel. The next step was to remove the model from the form and pouring the liquid metal over it. The observation of the casting surface was performed by using the scanning electron microscope and a profilometer. As a result of these attempts a number of castings have been obtained with an outside layer generated of lower roughness than the casting made in the normal gypsum form. The proposed method can be called an innovative one because it reduces the technological cycle by one processing operation of investment casting. During the process of casting both the cast and the outer layer improving the properties of the manufactured product is being produced.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 1 spec.; 47-50
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New investigation method of the permeability of ceramic moulds applied in the investment casting technology
    Nowa metoda oceny przepuszczalności form ceramicznych stosowanych w technologii wytapianych modeli
    Autorzy:
    Zych, J.
    Kolczyk, J.
    Snopkiewicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/379502.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technologies
    innovative foundry materials
    investment casting technology
    permeability
    ceramic mould
    innowacyjne materiały odlewnicze
    innowacyjne technologie odlewnicze
    technologia wytapianych modeli
    przepuszczalność
    forma ceramiczna
    Opis:
    The new investigation method of a permeability of ceramic moulds applied in the investment casting technology, is presented in the paper. Some concepts of performing permeability measurements are shown. Investigations in which the influence of the solid phase fraction in the liquid ceramic moulding sand (LCMS) on a permeability of a multi-layer ceramic mould were performed and discussed. The permeability was estimated during two the most important stages of the technological process: in the first – after wax melting and in the second – after mould annealing. Also an influence of the matrix grain sizes (material for sprinkling) on a ceramic mould permeability was estimated.
    W pracy przedstawiono nową metodę badań przepuszczalności form ceramicznych stosowanych w technologii wytapianych modeli. Zaprezentowano koncepcje prowadzenia pomiarów przepuszczalności form ceramicznych. Wykonano badania, w których określono wpływ udziału fazy stałej w ciekłej masie ceramicznej (CMC) na przepuszczalność wielowarstwowej formy ceramicznej. Oceniono przepuszczalność w dwóch najważniejszych etapach procesu technologicznego: w pierwszym - po wytopienia wosku oraz w drugim - po wyżarzeniu formy. Oceniono również wpływ wielkości ziarna osnowy, zwanej potocznie „obsypką” (materiałem do obsypywania), na przepuszczalność formy ceramicznej.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 2; 107-112
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of synthetic gypsum recovered via wet flue-gas desulfurization from electric power plants for use in foundries
    Autorzy:
    Biernacki, R.
    Haratym, R.
    Kwapisz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/380264.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innowacyjne materiały odlewnicze
    odsiarczanie spalin
    gips syntetyczny
    forma gipsowa
    forma ceramiczna
    innovative foundry materials
    flue gas desulfurization (FGD)
    waste gypsum (synthetic)
    gypsum mould
    ceramic mould
    Opis:
    This article investigates possible use of waste gypsum (synthetic), recovered via flue-gas desulfurization from coal-fired electric power plants, in foundries. Energy sector, which in Eastern Europe is mostly composed from coal-fired electric power plants, is one of the largest producers of sulfur dioxide (SO2). In order to protect the environment and reduce the amount of pollution flue-gas desulfurization (FGD) is used to remove SO2 from exhaust flue gases of fossil-fuel power plants. As a result of this process gypsum waste is produced that can be used in practical applications. Strength and permeability tests have been made and also in-depth analysis of energy consumption of production process to investigate ways of preparing the synthetic gypsum for casting moulds application. This paper also assesses the chemical composition, strength and permeability of moulds made with synthetic gypsum, in comparison with moulds made with traditional GoldStar XL gypsum and with ceramic moulds. Moreover examination of structure of synthetic gypsum, the investigations on derivatograph and calculations of energy consumption during production process of synthetic gypsum in wet flue-gas desulfurization were made. After analysis of gathered data it's possible to conclude that synthetic gypsum can be used as a material for casting mould. There is no significant decrease in key properties, and on the other hand there is many additional benefits including low energy consumption, decreased cost, and decreased environmental impact.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 3; 5-8
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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