TY - JOUR AU - FADOUL MOHAMMED IBRAHIM, JAMAL ELDIN AU - TIHTIH, Mohammed AU - Kurovics, Emese AU - Şahin, Ethem İlhan AU - Gömze, Antal László AU - Kocserha, István TI - Glass-Ceramic Foams Produced from Zeolite-Poor Rock (Tokaj) JF - POLLACK PERIODICA: AN INTERNATIONAL JOURNAL FOR ENGINEERING AND INFORMATION SCIENCES J2 - POLLACK PERIODICA VL - 18 PY - 2023 IS - 1 SP - 119 EP - 125 PG - 7 SN - 1788-1994 DO - 10.1556/606.2022.00641 UR - https://m2.mtmt.hu/api/publication/33210574 ID - 33210574 AB - This study evaluated the possibility of producing innovative glass-ceramic foams from zeolite-poor rock (Tokaj, Hungary) using alkali-activation and reactive sintering techniques. The composition and morphology of the samples were studied using X-ray diffraction, X-ray fluorescence, scanning electron microscope, and computed tomography techniques. The influence of various sintering temperatures on glass-ceramic foams was examined. It has been observed that zeolite-poor rock has a self-foaming capability. The heat treatment temperature affects the pore size and distribution as well as the technical characteristics of the obtained samples. The resulting glass-ceramic foams possess moderate thermal conductivity ranging from 0.11 to 0.17 W mK-1 and good compressive strength (1.5–4.4 MPa). The produced samples might be utilized for thermal insulation, which would have both economic and environmental advantages. LA - English DB - MTMT ER - TY - JOUR AU - FADOUL MOHAMMED IBRAHIM, JAMAL ELDIN AU - TIHTIH, Mohammed AU - Kurovics, Emese AU - Gömze, Antal László AU - Kocserha, István TI - Innovative Glass-Ceramic Foams Prepared by Alkali Activation and Reactive Sintering of Zeolite-Poor Rock and Sawdust JF - SOCIAL SCIENCE RESEARCH NETWORK: SSRN J2 - SOC SCI RES NETW (SSRN) VL - 1 PY - 2022 PG - 38 SN - 1556-5068 DO - 10.2139/ssrn.4065693 UR - https://m2.mtmt.hu/api/publication/33210518 ID - 33210518 LA - English DB - MTMT ER - TY - CONF AU - Mohammed, Al-Saudi Sarah kareem AU - Kurovics, Emese AU - FADOUL MOHAMMED IBRAHIM, JAMAL ELDIN AU - TIHTIH, Mohammed AU - Simon, Andrea AU - Géber, Róbert AU - Gömze, Antal László ED - Molnár, Dániel ED - Molnár , Dóra TI - STUDY OF THE PROPERTIES OF ALUMINUM TITANATE WITH THE ADDITION OF SILICA FUME T2 - XXV. Tavaszi Szél Konferencia 2022. Absztraktkötet PB - Doktoranduszok Országos Szövetsége (DOSZ) C1 - Budapest SN - 9786158205481 PY - 2022 SP - 782 UR - https://m2.mtmt.hu/api/publication/33204709 ID - 33204709 AB - Materials science research in general and ceramics in particular are evolving at a rapid pace. To achieve the best properties, ceramic technologies today aim to produce superior ceramic products from readily available raw materials. Aluminum titanate ceramic is a composite material mainly used as a refractory material in casting aluminum alloys compared to molten aluminum alloys. It is versatile due to its high melting temperature, excellent chemical resistance, low thermal expansion and excellent thermal shock resistance. In this work, the formation of aluminum titanate was studied by sintering at 1400°C samples prepared from mixtures of 80 wt% alumina and 20 wt% titania with the addition of 5 and 10 wt% silica fume. X-ray diffraction and scanning electron microscopy results show that the addition of silica stabilizes the structure of aluminum titanate Al2TiO5, and the mullite phase appears as a product of alumina Al2O3 and silica SiO2. Mullite has a wide range of applications as it has good mechanical and thermal properties. Silica Fume is a powdery by-product resulting from gasses evaporated during the production of silicon or ferrosilicon alloys. It is a very fine, noncrystalline, spherical powder with a material size up to 0.1µm. The sample with 5 wt% silica fume has the best properties because a small percentage of silica leads to stabilization of the aluminum titanate while improving the microstructure, which consists of small particle sizes, while too high a concentration of silica fume leads to grain growth, which negatively affects mechanical strength. The sample with 5 wt% has low porosity, low water absorption and low thermal conductivity value. This makes it attractive for applications such as thermal barriers, combustion engines and catalyst reference materials LA - English DB - MTMT ER - TY - JOUR AU - Kareem, Sarah AU - S.Al-Ansari, Luay AU - Gömze, Antal László TI - Modeling of Modulus of elasticity of Nano-Composite Materials: Review and Evaluation JF - JOURNAL OF PHYSICS-CONFERENCE SERIES J2 - J PHYS CONF SER VL - 2315 PY - 2022 IS - 1 PG - 10 SN - 1742-6588 DO - 10.1088/1742-6596/2315/1/012038 UR - https://m2.mtmt.hu/api/publication/33188799 ID - 33188799 AB - To improve the mechanical properties of polymer, the mineral particles are added to produce composite material. For example, the mineral particles are added to polymer to improve the stiffness of polymer because of the higher stiffness of mineral particles. When the micron-sized particles are used in composite usually cause a reduction in impact resistance. On the other hand, adding the nano scale minerals leads to improve the impact and wear properties of the composite materials (nanocomposites). Several factors effect on the mechanical properties of nanocomposites like adhesion between the polymer and nanoparticles. If the interfacial deboning of particles from the matrix decreases, the tensile strength of the composite could be reduced. LA - English DB - MTMT ER - TY - JOUR AU - Antonets, I V AU - Golubev, Ye A AU - Ignatiev, G V AU - Shcheglov, V I AU - Gömze, Antal László AU - Sun, Shiyong TI - Influence of layers orientation of graphene stacks in shungite disordered carbon to its integral electrical conductivity JF - JOURNAL OF PHYSICS-CONFERENCE SERIES J2 - J PHYS CONF SER VL - 2315 PY - 2022 IS - 1 PG - 7 SN - 1742-6588 DO - 10.1088/1742-6596/2315/1/012039 UR - https://m2.mtmt.hu/api/publication/33188723 ID - 33188723 AB - The map of carbon distribution in the sample of graphene-containing shungite is investigated by the electron microscopy. It is found the large quantity of stacks which are formatted by parallel disposed layers of graphene. The model of electrical conductivity of graphene stack is proposed. This model takes into consideration the arbitrary orientation of layers relatively to the direction of current. It is made the numerical calculation of dependence of conductivity from the orientation of graphene layers. It is found the sharp abatement of conductivity by the orientation of graphene layers relatively to the current direction along the corner near the 45 degree. The obtained peculiarities are explained by the influence of geometrical factor. LA - English DB - MTMT ER - TY - JOUR AU - Ponaryadov, A AU - Kotova, O AU - Sun, S AU - Kurovics, Emese AU - FADOUL MOHAMMED IBRAHIM, JAMAL ELDIN AU - Gömze, Antal László TI - Comparative study of stages of titanium minerals formation in nature and experiment for “smart” materials industry JF - JOURNAL OF PHYSICS-CONFERENCE SERIES J2 - J PHYS CONF SER VL - 2315 PY - 2022 IS - 1 PG - 13 SN - 1742-6588 DO - 10.1088/1742-6596/2315/1/012009 UR - https://m2.mtmt.hu/api/publication/33188662 ID - 33188662 AB - The economic importance of titanium oxides and hydroxides results in the active development of titanium deposits. Considering world trends in the development of titanium ores and taking into account their mineralogical features, a comparative study of stages of titanium minerals formation in nature (mineralogenesis) and their transformations in technological processing or synthesis (technogenesis) under hydrothermal conditions at the macrolevel (textural), micro-level (structural) and nanoscale (heterogeneity of individuals and microaggregates, including the synthesis of nanostructures) was made. The natural mechanism of mineral formation of titanium ores in the geological system (titanium ore – hydrothermal conditions) have been successfully used to simulate the synthesis of titanium nanotubes: a trigger for the redeposition of ore matter with the formation of new mineral phases and restructuring at the macro-, micro- and nanoscale is the energy of the geological system/its model, which is sufficient to create conditions for inhomogeneiting (destabilizing) the initial structure of titanium minerals due to external influences (P, T, pH). The relationship between the stages of mineral formation processes in nature and experiment as a promising strategy for the “smart” materials industry was discussed. LA - English DB - MTMT ER - TY - JOUR AU - TIHTIH, Mohammed AU - FADOUL MOHAMMED IBRAHIM, JAMAL ELDIN AU - Basyooni, Mohamed A. AU - Belaid, Walid AU - Gömze, Antal László AU - Kocserha, István TI - Structural, optical, and electronic properties of barium titanate: experiment characterisation and first-principles study JF - MATERIALS TECHNOLOGY J2 - MATER TECHNOL VL - 2022 PY - 2022 PG - 11 SN - 1066-7857 DO - 10.1080/10667857.2022.2107473 UR - https://m2.mtmt.hu/api/publication/33108060 ID - 33108060 LA - English DB - MTMT ER - TY - JOUR AU - FADOUL MOHAMMED IBRAHIM, JAMAL ELDIN AU - Kurovics, Emese AU - TIHTIH, Mohammed AU - Gömze, Antal László AU - Kocserha, István TI - Synthesis and characterization of alkali-activated zeolite-poor rocks JF - JOURNAL OF PHYSICS-CONFERENCE SERIES J2 - J PHYS CONF SER VL - 2315 PY - 2022 IS - 1 PG - 7 SN - 1742-6588 DO - 10.1088/1742-6596/2315/1/012020 UR - https://m2.mtmt.hu/api/publication/33064752 ID - 33064752 AB - Zeolite-geopolymer composite materials were obtained through mechanical activation using planetary ball mill followed by chemical activation using an aqueous solution of sodium hydroxide (NaOH), these materials integrate the beneficial features of both zeolites and geopolymers. In this present work, the morphological characteristics, microstructure, phase determination of raw materials and the generated ceramic samples were studied by several characterization methods such as SEM, EDS and XRD. The microstructural analysis confirms the formation of needle-like structure in sub-micron and nanostructure, while the phase identification reveals the creation of single-phase zeolite (heulandite). LA - English DB - MTMT ER - TY - JOUR AU - FADOUL MOHAMMED IBRAHIM, JAMAL ELDIN AU - TIHTIH, Mohammed AU - Kurovics, Emese AU - Gömze, Antal László AU - Kocserha, István TI - Innovative glass-ceramic foams prepared by alkali activation and reactive sintering of clay containing zeolite (zeolite-poor rock) and sawdust for thermal insulation JF - JOURNAL OF BUILDING ENGINEERING J2 - J BUILDING ENG VL - 59 PY - 2022 PG - 17 SN - 2352-7102 DO - 10.1016/j.jobe.2022.105160 UR - https://m2.mtmt.hu/api/publication/33062506 ID - 33062506 N1 - In comparison to organic insulation materials like polymer foams which have short lives and are flammable [22], glass-ceramic foams have unique features, including lightweight, high thermal stability, excellent thermal and electrical insulation, fireproof, good corrosion resistance sound, and shock wave absorption [23], [24], [25], [26]]. [26] M. Sassi, J.F.M. Ibrahim, A. Simon: Characterization of foam glass produced from waste CRT glass and aluminium dross AB - Energy-saving through thermal insulation of the buildings is becoming extremely important recently, addressing sustainability-connected challenges. This work addresses the potential for producing innovative glass-ceramic foams from zeolite-poor rock and sawdust using alkali activation and reactive sintering techniques. A comprehensive analysis has been conducted for the detailed characterization of raw materials as well as the produced samples. The starting raw materials and the produced samples were investigated based on their chemical constituents, particle size distribution, BET (Brunauer, Emmett and Teller), X-ray diffraction (XRD), X-ray fluorescence (XRF), energy-dispersive X-ray spectroscopy (EDS), thermogravimetric (TG), differential thermal analysis (DTA), scanning electron microscopy (SEM) and computed tomography (CT). The alkali activation and the mechanism of foaming were systematically discussed. The optimal sintering temperature and the maximum expansion percentage are evaluated using heating microscopy. The findings show that the used alkali-activated raw mixtures have excellent foamability at 850–950 °C. The influence of the sawdust content and sintering temperatures on different technical characteristics such as bulk density, volume expansion, compressive strength, thermal conductivity, morphologies, phase identification, and microstructural properties of the sintered samples were thoroughly examined. The SEM and CT analysis of the produced specimens reveals the formation of foams with different types of pore sizes and distribution. The produced glass-ceramic foams have compressive strengths ranging from 0.3–4.5 MPa and thermal conductivities ranging from 0.058 to 0.178 W/mK. Development of these value-added glass-ceramic foams utilizing easily obtainable, low price raw materials should result in economically cost-effective materials with extra environmental benefits. LA - English DB - MTMT ER - TY - JOUR AU - FADOUL MOHAMMED IBRAHIM, JAMAL ELDIN AU - Gömze, Antal László AU - Koncz-Horváth, Dániel AU - Filep, Ádám AU - Kocserha, István TI - Preparation, characterization, and physicomechanical properties of glass-ceramic foams based on alkali-activation and sintering of zeolite-poor rock and eggshell. Zeolite-poor rock, Eggshell, Alkali activation, Compressive strength, Thermal conductivity TS - Zeolite-poor rock, Eggshell, Alkali activation, Compressive strength, Thermal conductivity JF - CERAMICS INTERNATIONAL J2 - CERAM INT VL - 48 PY - 2022 IS - 18 SP - 25905 EP - 25917 PG - 13 SN - 0272-8842 DO - 10.1016/j.ceramint.2022.05.267 UR - https://m2.mtmt.hu/api/publication/33042722 ID - 33042722 LA - English DB - MTMT ER -