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Evaluation of High-temperature Physicochemical Interactions Between the H282Alloy Melt and Ceramic Material of the Crucible

Z. Pirowski
Archives of Foundry Engineering | 2014 | No 4 | DOI: 10.2478/afe-2014-0091
Keywords Nickel alloys Superalloys Melting Reactivity Metal/ceramic reaction Refractory materials
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Abstract

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 theH282alloy 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 ceramics exhibits greater reactivity in contact with the H282 alloy

melt than the materials based on zirconium compounds. 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.

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Authors and Affiliations

Z. Pirowski

Determination of Unit Pressure Force in Material Volume in the Course of Refractory Stamping Press Moulding

M. Korzeniowski A. Trytek M. Tupaj K. Sondej L. Kozak M. Mróz B. Kupiec A.W. Orłowicz Z. Cisek
Archives of Foundry Engineering | 2016 | No 2 | DOI: 10.1515/afe-2016-0027
Keywords Die stamping Refractory materials Metal die Material density
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Abstract

The paper presents results of assessment of the unit pressure force within the refractory material volume in the course press-moulding of

stampings for refractory precast shapes. The force was evaluated with the use of physical simulation of deformation undergone by lead

balls placed in the raw refractory mass subjected to pressing in a metal die. To determine the value of unit pressure force applied to the

aggregate grains in the course of stamping press-moulding, physical model of deformation of a sphere induced by the uniaxial stress state

was used.

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Authors and Affiliations

M. Korzeniowski
A. Trytek
M. Tupaj
K. Sondej
L. Kozak
M. Mróz
B. Kupiec
A.W. Orłowicz
Z. Cisek

An Assessment of Appropriateness of the Choice of Parameters for Refractory Stampings Fabrication Process

A.W. Orłowicz M. Mróz M. Tupaj A. Trytek B. Kupiec M. Korzeniowski D. Pająk K. Sondej L. Kozak
Archives of Foundry Engineering | 2016 | No 2 | DOI: 10.1515/afe-2016-0026
Keywords Die stamping Refractory materials Metal die Material density
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Abstract

The paper presents results of an analysis of material density distribution in stampings press-moulded in metal dies from raw refractory

materials based on alumina-magnesia-carbon aggregate. The stampings, fabricated on LAEIS HPF 1250 pressing machine, are blanks from

which refractory precast shapes are manufactured by means of drying and firing. Samples for material density evaluation were cut out

from test stampings with the use of diamond-reinforced disc. Density of the material was determined in thirteen layers of stampings

denoted with letters A through M.

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Authors and Affiliations

A.W. Orłowicz
M. Mróz
M. Tupaj
A. Trytek
B. Kupiec
M. Korzeniowski
D. Pająk
K. Sondej
L. Kozak

Characterization of Ijero-Ekiti Quartz as Refractory Raw Material for Industrial Furnace

B.V. Omidiji O.B. Ogundipe H.A. Owolabi
Archives of Foundry Engineering | 2023 | vol. 23 | No 4 | 14-21 | DOI: 10.24425/afe.2023.146674
Keywords quartz refractory materials Industrial furnace thermal properties chemical composition
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Abstract

This study investigated the suitability of Ijero-Ekiti quartz as a refractory raw material for industrial furnace applications. In order to ascertain its prospective applications, the thermal behaviour, mineralogical composition and chemical composition were determined. Ijero-Ekiti quartz was characterized using Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), Thermogravimetric and Differential Thermal analysis (TGA and DTA). Its thermal conductivity with specific heat coefficient was determined. The outcome revealed that the quartz sample has a high purity of 94.3% SiO 2, making it suitable as a refractory material. The XRD analysis revealed the presence of alpha-quartz as the dominant crystal phase, which is desirable for refractory applications. The FTIR analysis indicated the absence of hydroxyl (-OH) groups. This indicates a low risk of failure and damage such as spalling, cracking and other forms of damage when produced into bricks. The TGA and DTA displayed significant mass losses and large endothermic bands, which were connected to the dehydroxylation of the quartz rock samples. Based on the demonstrated qualities, the quartz rock sample could be subjected to thermal processing. This study therefore established that Ijero-Ekiti quartz is a suitable raw material for refractory applications due to its high purity, alpha-quartz dominant crystal phase, absence of hydroxyl groups, and uniform morphology.
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Authors and Affiliations

B.V. Omidiji
1
O.B. Ogundipe
2
H.A. Owolabi
1
  1. Obafemi Awolowo University, Ile-Ife, Nigeria
  2. Landmark University, Omu-Aran, Nigeria

Analysis and Quality Assessment of Refractories Formed under Reduced Pressure

Alicja Trela Alena Pribulová Peter Futas
Archives of Metallurgy and Materials | 2023 | vol. 68 | No 4 | 1571-1578 | DOI: 10.24425/amm.2023.146224
Keywords Foundry melting furnace refractory materials vacuum moulding porosity
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Abstract

Refractories are the basic material for the construction of the lining of a melting furnace used, among other things, in the foundry industry. The article describes a comparative study of the influence of the type of moulding on the quality of the finished refractory product. A method for making products from refractory materials was proposed and a test methodology was developed. The results, based on a classic study of the quality of these materials, confirm a strong influence on the quality of the materials obtained in terms of reduced porosity and homogeneity of pore size.
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Authors and Affiliations

Alicja Trela
1
ORCID: ORCID
Alena Pribulová
2
ORCID: ORCID
Peter Futas
2
ORCID: ORCID
  1. AGH University of Krakow, Faculty of Foundry Engineering, Al. Mickiewicza 30, 30-059 Kraków, Poland
  2. Technical University Kosice, Department of Metallurgy, Slovakia

Analysis and Quality Assessment of Refractories Formed under Reduced Pressure

Alicja Trela M. Brzeziński A. Pribulova Peter Futas
Archives of Metallurgy and Materials | 2023 | vol. 68 | No 3 | 1003-1010 | DOI: 10.24425/amm.2023.145467
Keywords foundry melting furnace refractory materials vacuum moulding porosity
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Abstract

Refractories are the basic material for the construction of the lining of a melting furnace used, among other things, in the foundry industry. The article describes a comparative study of the influence of the type of moulding on the quality of the finished refractory product. A method for making products from refractory materials was proposed and a test methodology was developed. The results, based on a classic study of the quality of these materials, confirm a strong influence on the quality of the materials obtained in terms of reduced porosity and homogeneity of pore size.
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Authors and Affiliations

Alicja Trela
ORCID: ORCID
M. Brzeziński
1
ORCID: ORCID
A. Pribulova
2
ORCID: ORCID
Peter Futas
ORCID: ORCID
  1. AGH University of Krakow, Faculty of Foundry Engineering, Al. Mickiewicza 30, 30-059 Krakow, Poland
  2. Technical University, Department of Metallurgy, Kosice, Slovakia

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