Dominika Madej

Dominika Madej
AGH University of Science and Technology in Kraków | AGH · Department of Ceramics and Refractories

PhD. DSc. Eng. Professor AGH
REFRACTORIES, cement-free and cement-containing monolithic refractories. R&D Project Leader. Materiały ogniotrwałe - PL.

About

61
Publications
14,162
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
415
Citations
Citations since 2016
39 Research Items
361 Citations
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080
Introduction
I am working on REFRACTORIES, especially cement-containing and cement-free castables.
Additional affiliations
October 2015 - present
AGH University of Science and Technology in Kraków
Position
  • Professor (Assistant)

Publications

Publications (61)
Article
In this paper, usefulness and accuracy of the new Impedance Camera working in the time-resolved electrochemical impedance spectroscopy (TR-EIS) mode was demonstrated. Flash setting monophase hydraulic binder material Ca7ZrAl6O18 (C7A3Z), and traditional both Ordinary Portland Cement (OPC) and calcium aluminate cement (CAC)-based alumina spinel cast...
Article
In this work, two types of cement-free and CAC-containing binders were designed, prepared, and studied. The main purpose of this work was to demonstrate an alternative route to elaborate CAC-free hydraulic binder systems designed for monolithic refractories, e.g., castables. The fundamental research presented in this paper was focused on comparing...
Article
Composite cements belonging to the CaO–Al2O3–ZrO2 (C-A-Z) and CaO–SrO–Al2O3–ZrO2 (C–Sr-A-Z) systems were evaluated as alternatives to calcium aluminate cements (CACs) for use in the refractory castables technology. The mineralogical phases in the as-synthesized C-A-Z and C–Sr-A-Z clinkers confirmed by XRD and SEM-EDS were CaAl2O4, Ca7ZrAl6O18 and C...
Article
Full-text available
This study investigated the effect of the CaO/SiO2 mass ratio of steel slag on the corrosion behavior of spinel-forming alumina-based castables with a content of MgO (3–7 wt.%). Equiweight mixtures of castables and slags were calculated by FactSage, observed by HMTA, fired at 1350 °C, and investigated by XRD. From these results, we conclude that th...
Article
The mechanical properties of in-situ spinel (MgAl2O4)-forming alumina-based castables under intermediate temperatures are of critical importance before the refractory lining system reaches normal operating conditions. The objective of this study is to elucidate the role of the hydrotalcite formed within a fine-grained castables matrix, in which no...
Article
Hydrotalcite-like compounds (HTlc) are commonly known anionic clay that may potentially be used as hydraulic binder component for refractory materials, ion exchangers, catalyst or carrier of bioactive molecules. According to current state of knowledge LDH (Layered Double Hydroxides) can be synthesized using various methods including mechanochemical...
Article
Full-text available
A series of silicate-phosphate glass materials from the SiO2-P2O5-K2O-MgO system (pure and doped with sulfur ions) were synthesized by melting raw material mixtures that contained activated carbon as a reducer. The bulk composition of glass was confirmed with X-ray fluorescence spectroscopy. The homogeneity of the glass was confirmed through elemen...
Article
Full-text available
In refractory castables during heat treatment, there is a dynamic change from a hydraulic bond to a ceramic bond. During heating, the emission of water takes place; this changes the conditions inside the material to something similar to the hydrothermal ones. This influences the processes that occur during the heating of the castables, and in conse...
Article
A novel method enabling low-cost and very fast determination of physicochemical properties of solids exploring the microwave energy absorption phenomena is proposed and studied. A set of La,Nd-doped Y 2 O 3 ceramic samples were manufactured using the sol-gel process and free sintering. XRD analysis revealed that the crystallite size of samples is i...
Article
This paper presents an experimental study on the performance of shielding refractory concretes containing new types of cements for use in the radiation protection technology. Three concretes with corundum aggregate and special refractory inorganic cements belonging to the CaO-Al2O3, SrO-CaO-Al2O3-ZrO2, SrO-Al2O3 and BaO-CaO-Al2O3-ZrO2 systems were...
Article
This experimental investigation focuses on the preparation of polycrystalline magnesium oxide transparent ceramics via arc-melting technique. Dense and compact transparent ceramics with interesting magneto-optical properties, and good transparency over 60% are proposed as a promising material for window and a magneto-optical device. Surface micro-m...
Article
Full-text available
This work concerns the hydration mechanism of calcium zirconium aluminate as a ternary compound appearing in the CaO-Al2O3-ZrO2 diagram besides the calcium aluminates commonly used as the main constitutes of calcium aluminate cements (CACs). Moreover, a state-of-the-art approach towards significant changes in hydraulic properties was implemented fo...
Article
Full-text available
The hydration of an equimolar mixture of MgO and Al2O3 nano-powders has been proven to be an effective way to synthesize Mg6Al2CO3(OH)16∙4H2O as a component of a nano-structured matrix and magnesia-alumina spinel precursor for high-performance cement-free corundum-spinel refractory castables. (Mg3)–OH–brucite sites (417 °C) formed initially within...
Conference Paper
Full-text available
The application of refractories with the addition of the spinel phase as the wear linings in the steel ladles has increased in recent years. By filling up the steel ladle, the temperature goes high, then, after emptying the ladle and waiting for the next steel refining process, temperature decreases. Due to the high-temperature fluctuations, therma...
Article
Full-text available
This work directly links the performance with the phase evolution in the MgO-Al2O3-SiO2-H2O system during the hydrothermal treatment. Cement-free refractory binders, considered as alternative to calcium aluminate cements, with the chemical compositions fine-grained mixtures of MgO-Al2O3, MgO-Al2O3-SiO2, and MgO-SiO2 reactive powders were subjected...
Article
Calcium zirconium aluminate, Ca7ZrAl6O18, is only the ternary compound of CaO, Al2O3 and ZrO2 with hydration reactivity. Calcium zirconium aluminate is conventionally synthesized by a solid-state reaction processing using CaCO3, Al2O3 and ZrO2, as starting materials at temperatures exceeding 1400 °C. In the present study, Ca7ZrAl6O18 along with som...
Article
Full-text available
In this paper, the influence of precursors (CA, C7A3Z, C12A7, C6SrA3Z, C7A2FZ and commercial calcium aluminate cement ‘Gorkal 70’) on the structure, microstructure and thermal stability characterizations of C3AH6 through hydration was investigated. The materials were characterized by X-ray diffraction, differential thermal analysis–thermogravimetri...
Article
Full-text available
A state-of-the-art fabrication of Y2O3 transparent ceramic by arc plasma synthesis using commercial micron-size powders is reported. The morphological observations of the surface by scanning electron microscope shows that a dense microstructure can be obtained. Arc melted samples are made of a white core and transparent layer. X-ray diffraction stu...
Presentation
Nowadays, spinel containing refractories are widely used in steel making industry. MgO-spinel and Al2O3-spinel bricks show improved slag penetration resistance in the steel ladle. Spinel phase in a refractory material possesses a good combination of physical and chemical properties such as high refractoriness, high mechanical strength and high resi...
Article
Full-text available
Electrochemical impedance spectroscopy has been employed to monitor hydration of strontium monoaluminate (SrAl2O4) cement. Other supported techniques such as X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy with energy-dispersive X-ray spectroscopy, thermal analysis (DSC–TG–EGA) and microcalorimetry were also...
Article
The approach to equivalent circuit modelling of reference Ca7ZrAl6O18 and (Ca,Sr)7ZrAl6O18 cement pastes has been to interpret spectra obtained from impedance measurements, assigning electrical responses to the hydration features such as hydration products and microstructure. The early and long-term hydration behaviour of new cements was also trace...
Article
Full-text available
This paper deals with the design, synthesis, hydration mechanism and hydration products of novel Ba²⁺-, Cu²⁺- or Bi³⁺-doped CaO–Al2O3–ZrO2-based cementitious materials used for heavyweight concrete mixes. The results of the heating microscopy thermal analysis indicated that both Cu and Bi in a Ca7ZrAl6O18-based cement clinker can effectively reduce...
Poster
Full-text available
Refractories are widely used in the steel ladle in different zones. Spinel refractory castables have easy installation, high mechanical properties, and excellent slag resistance. In the present study, physicomechanical behavior of alumina spinel refractory castables were investigated at different temperatures (110°C, 900°C and 1500°C) under laborat...
Article
Full-text available
One possible application for zirconium oxide is as a metering nozzle in a tundish for continuous steel casting. Such nozzles are mounted at the bottom of the tundish, and they are exposed to the corrosive effect of liquid steel at a temperature up to 1600 °C. In this study, the corrosion behavior of the zirconia metering nozzle after service in a t...
Article
Full-text available
The reactivity of the binary mixtures of reactive magnesia and hydratable alumina micro-powders with various compositions was investigated by calorimetric method, X-ray diffraction, simultaneous DSC–TGA with thermal evolved gas analysis–mass spectrometry and scanning electron microscope observations. The effect of the MgO/Al2O3 molar ratio (2:1, 1:...
Article
This paper summarizes a reinvestigation of the dehydration and dehydroxylation of synthetic layered (oxy)hydroxides through thermal analysis (TG-DSC-EGA-MS). As well a discussion to the second Pauling’s rule have been done. Simple metal-hydroxides i.e. Mg(OH)2 and Al(OH)3, closely related aluminium oxide hydroxide, AlO(OH) and (Mg-Al-OH) type layer...
Article
Electrochemical impedance spectroscopy (EIS) has been employed to track the variation in hydration kinetics for fast setting cementitious material (Ca7ZrAl6O18) and standard calcium aluminate cement (CAC). In a pure form, Ca7ZrAl6O18 reacts very violently with water, resulting in an immediate formation of the Ca-Al hydrates which cause an abnormal...
Article
This paper describes the design, synthesis and hydraulic activity of novel Sr²⁺-doped Ca7ZrAl6O18 cement in respect of potential applications as: matrix used in nuclear waste immobilisation, components of X-rays and gamma radiation shielding concretes or utilized in refractories technology. The obtained material was characterized by X-ray diffracti...
Article
Full-text available
This paper studies hydration stages and phase transformation mechanism of the Sr2+-doped calcium zirconium aluminate cement at room temperature. Features of different hydration stages of this cement paste are identified by X-ray diffraction, scanning electron microscopy, differential thermal analysis, thermogravimetric analysis, evolved gas analysi...
Article
This paper describes a new approach for synthesizing novel composite cements belonging to the system CaO–Al2O3–ZrO2 via the high-temperature reactions within the Ca7ZrAl6O18–Al2O3 system and characterizes products using X-ray diffraction (XRD), Rietveld XRD quantification, infrared spectroscopy, scanning electron microscopy combined with energy-dis...
Article
Full-text available
This work investigates the time-dependent hydration behavior of 1:1 molar ratio mixture of reactive α-Al2O3 nano- or micro-powder and reactive MgO in relation to the development of new hydraulic binder systems for in situ spinel refractory corundum castables. Mg–Al–CO3 hydrotalcite-like phases formed in the cementitious matrices cured in the corres...
Article
The corrosion chemistry of SiC-modified andalusite refractories has been studied using a post-mortem approach that considers both K⁺ and Ca²⁺ ions as the main corrosive agents existing in the cyclone preheater applied in the cement production line. The transient progress of corrosion reactions was investigated as the function of distance from the f...
Article
The reactivities of the binary and ternary mixtures of reactive magnesia (MgO≡M), hydratable alumina (Al2O3≡A) and microsilica (SiO2≡S) micropowders were investigated by calorimetric method and other analytical techniques (X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), differential thermal/thermogravimetric (DTA-TG) analy...
Article
Full-text available
Ceramic material of composition belonging to the Al2O3-CaAl12O19-ZrO2 compatibility field was obtained as a result of hydration and sintering of the mixture of Al2O3 and Ca7ZrAl6O18 powders. The hydrated Al2O3-Ca7ZrAl6O18 mixture products were studied by XRD, DTA-TG-EGA and FT-IR after 14 days of curing and hydration at 50°C. C3AH6, Al(OH)3 and CaZ...
Article
Full-text available
This paper presents a study on the phase composition and microstructure changes of a sintered Mg-stabilized zirconia metering nozzle exposed to the corrosive effect of the molten steel and slag in a tundish for continuous casting for 30 h. A macroscopic observation of the corroded material showed cracks and two zones that were distinguished with re...
Article
ZrSiO4-containing andalusite brick after service in cement kiln preheater was analysed by means of XRF, XRD and SEM/EDS techniques in order to determine the corrosion mechanism during 8-months industrial-scale corrosion test in high-alkaline environment at 1100 °C. The detailed investigation of the wear mechanism through “post-mortem studies” of th...
Article
The possibility to increase the stability of the heating unites combustion zone refractory structures, made of the aluminate cement composite concrete, using for this aim polypropylene and carbon fiber additives, was investigated in this work. The peculiarities of microstructure evolutions in the fiber and binder contact zone, the channels formatio...
Article
Full-text available
The reactivities of hydratable alumina, calcium zirconium aluminate and their binary mixtures were investigated by calorimetric method, X-ray diffraction, Fourier transform infrared spectroscopy (FT-IR), differential thermal/thermogravimetric analysis (DTA-TG) and scanning electron microscope observations. The rate of heat evolution illustrates onl...
Article
A composite with the 0.8CaZrO3-0.2CaFe2O4 general formula was prepared by means of a double sintering process. Temperature of 1400 °C was found suitable to obtain the composite based on scanning electron microscopy and X-ray diffraction analysis. Phase composition, crystal structure, Mössbauer effect, microstructure and dielectric properties were s...
Article
In this paper, the results of experimental study concerning the characterization of dehydration behavior of the hydrated Ca7ZrAl6O18 phase are presented. The hydrated and dehydrated Ca7ZrAl6O18 pastes were investigated by DTA-TG-EGA, LT-XRD, HT-XRD, FT-IR, and SEM/EDS techniques. The original Ca7ZrAl6O18 changed to the calcium–aluminate–hydrates (C...
Article
Single Ca3ZrSi2O9 phase, baghdadite, was synthesized by the standard ceramic route at a high temperature. Calcium zirconosilicate, Ca3ZrSi2O9, was characterized by FT-IR and Raman spectroscopy. The ab initio calculations of IR and Raman spectra for the baghdadite crystal structure were carried out by means of the Crystal09 program. The obtained res...
Article
In this paper, the results of an experimental study concerning the dehydration behavior of the hydrated MgO-CaZrO3-Ca7ZrAl6O18 green compacted sample are presented. Hydrated MgO-CaZrO3-Ca7ZrAl6O18 mixture products were studied by XRD, DTA-TG and FT-IR after 24 h of curing and hydration at room temperature. According to the XRD examination it has be...
Article
Full-text available
The study of magnesia-chrome refractories corrosion by liquid steel and the liquid calcium-silicate based slag was carried out in the environment in RH degasser. The microstructures of the as-delivered and tested samples were researched by SEM-EDS methods. Our experiment produced the following results: 1. the initial spinel phase, Mg(Cr,Al,Fe)2O4 s...
Article
Full-text available
The aim of this study was to evaluate the influence of time of ageing on phase evolution of paste from MgO-SiO2-H2O phase system. The paste was composed of fine grained sintered magnesia and microsilica in 1:2 molar ratio and water, with water to solid ratio equal 0,5. After preparation the paste was ageing during specified time up to 180 days in t...
Article
In this paper, the results of experimental study concerning the hydration behavior of Ca7ZrAl6O18 with water to solid (w/s) ratios of 0.5 and 1.0 at 60 C are presented. Hydration products were studied by XRD, DTA-TG and SEM/EDS after 24h; 3, 7, 14 and 21 days of curing and hydration. Ca7ZrAl6O18 in paste form, at w/s ratio of 0.5, showed one clearl...
Article
The behaviour of the mixture of MgO and SiO2 with water was studied and analyzed by DTA–TGA–EGA and XRD after ageing for 1, 3, 10, 30 and 180 days at 20 °C. The samples also were aged at 30 °C and 40 °C for 1 and 3 days. Additionally, after 180 days the samples were heated in 500 °C, 700 °C and 900 °C for 24 h. The paste was composed of magnesium o...
Article
The hydration products and thermal decomposition mechanism of hydrated CaAl2O4 and Ca7ZrAl6O18 compounds were investigated by X-ray diffraction, SEM/EDS and thermal analysis. The processes of crystal hydrate nucleation and precipitation were preceded by the evolution of the X-ray amorphous phase during the first 24 h of hydration. DTA–TGA–EGA techn...
Article
The hydraulic properties of the Ca7ZrAl6O18 (C7A3Z) phase as well as the hydration products and thermal decomposition mechanism of this hydrated phase were studied. Microcalorimetric analysis has shown that the C7A3Z phase reacts with water very quickly, especially in the first 2 h after the start of the experiment. Hydration of calcium zirconium a...
Article
Calcium zirconate (CaZrO3), because of its high melting point, low thermal expansion coefficient, high strength and excellent corrosion resistance against alkali oxides, is a good candidate for a novel refractory material. CaZrO3 is mostly synthesized by the reaction in the solid state but the material obtained in such a way often suffers low bulk...

Network

Cited By

Projects

Projects (4)
Project
We provide and accelerate the development of radically new high-resistant ceramics. To avoid the limitations of application of medium and high-power lasers, we have designed unlimited size magnetooptical materials. An arc plasma melting methods have been recently applied to new magnetooptical materials discovery. Our solutions give high transparent and dense ceramic materials. Currently, we are looking for a businnes partner to release alternative Faraday devices. Thank for finnancial support from 2016/23/D/ST8/00014 (National Science Centre, Sonata) and TANGO-V-A/0016/2021 (National Center for Research and Development, Tango A) projects.
Project
The main goal of this research project is to design a new class of materials i.e. novel composite special cements belonging to the system CaO-Al2O3-ZrO2 doped with metal cations of different valence. The scientific goal of the research project is also to study of early hydration mechanisms of cements using dynamic electrochemical impedance spectroscopy (DEIS).
Project
Define interaction between corroded microstructure and thermomechanical behaviour of refractory lining.