The influence of shaping and firing technology on ceramic properties of calcareous and non-calcareous illitic–chloritic clays

Carretero, Marı́a Isabel; Dondi, Michele; Fabbri, B.; Raimondo, M.

doi:10.1016/s0169-1317(01)00076-x

Cited by 119 publications

(56 citation statements)

References 5 publications

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“…This result was particularly noticeable in composition 2, formulated with the highest amount of clay. As explained below, the different microstructures obtained by pressing or extruding ceramics could explain this fact [34], [35]. However, this difference tended to decrease (the pore size distribution curves of the P3 and E3 bodies almost coincide) when starch was added to the initial compositions, as a consequence of the drastic change in microstructure developed by the starch burnout [20], [28], [41]- [44].…”

Section: Membrane Physical Characterizationmentioning

confidence: 99%

“…This is because in many cases the ceramic compositions in terms of the nature and quantity of raw materials and additives must be adapted to a specific shaping method, as recently reported [13]. However, the strong impact of the ceramic forming on the microstructure and consequently on the final product properties and performance is widely accepted in other ceramic manufacturing processes [34]- [36].…”

Section: Introductionmentioning

confidence: 99%

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Comparison of extruded and pressed low cost ceramic supports for microfiltration membranes

Lorente-Ayza

Mestre

Menéndez

et al. 2015

Journal of the European Ceramic Society

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A comparison has been made between ceramic microfiltration membranes of the same composition obtained by pressing and by extrusion in terms of microstructure and properties.The extruded membranes displayed lower porosity and smaller pore size than pressed membranes. The higher the clay content in the starting composition, the clearer this tendency became. In contrast, the difference tended to disappear when starch was added to the initial composition. The mechanical strength values followed a decreasing exponential variation with porosity, which was influenced by the starting composition and the shaping method.Water permeability reflected the strong effect of the mean pore size. The membranes synthesised from the composition with the higher clay content showed the lowest permeability, while those obtained from the composition including starch showed the highest value. A model derived from the Hagen-Poiseuille equation enabled the tortuosity values to be calculated.

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Section: Membrane Physical Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparison of extruded and pressed low cost ceramic supports for microfiltration membranes

Lorente-Ayza

Mestre

Menéndez

et al. 2015

Journal of the European Ceramic Society

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“…Literature review does not provide more information to explain this behavior. A similar case has been observed with calcareous clay in Italy, nevertheless there is no clear answer even after evaluating variables such as porosity, grain size, mineralogy and firing rate (28)(29)(30).…”

Section: Structural and Morphological Characterization Of The Materiamentioning

confidence: 58%

Influencia de las materias primas y de la técnica de moldeo en la fabricación de productos cerámicos tipo gres

2017

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ResumenSe empleó material arcilloso y caliza proveniente de minas cercanas a la zona metropolitana de Cúcuta, así como el material de rotura después del proceso de cocción de productos cerámicos (chamota) para la conformación de probetas de baldosas cerámicas mediante las técnicas de extrusión y prensado. Una vez realizado el proceso cerámico (con temperaturas de cocción entre 1050°C y 1250°C), se evaluó el efecto de las diferentes mezclas preparadas sobre las propiedades tecnológicas de resistencia mecánica a la flexión, abrasión profunda y porcentaje de absorción de agua de acuerdo a la norma técnica colombiana. Los productos cocidos fueron caracterizados mediante difracción de rayos X, fluorescencia de rayos X y microscopía electrónica de barrido a fin de evidenciar efectos causados por las materias primas y el tipo de moldeo empleado. Los resultados obtenidos dejan ver la existencia de un efecto de la composición mineralógica de las muestras y de la técnica de conformado sobre la propiedades tecnológicas analizadas al momento de elaborar cerámicos gresificados. Se evidenció que para las mezclas de materias primas utilizadas, la técnica de extrusión permite una más rápida formación de fase vítrea y contribuye a una recristalización más rápida en altas temperaturas. Los mejores valores para las propiedades tecnológicas analizadas fueron encontrados en la temperatura de 1150°C. Palabras clave: Caracterización, cerámica roja, chamota, extrusión, gres, prensado.Abstract Clay-rich materials and limestone from mines close to the metropolitan area of Cucuta together with materials obtained after firing process of ceramic products (chamotte) were used to form samples of ceramic tiles using extrusion and pressing. Once the ceramic process was finished (with firing temperatures between 1050 °C and 1250 °C), the effect of different ceramic pastes on technological characteristics, such as mechanical resistance to flexion, deep abrasion and percentage of water absorption, was evaluated according to the Colombian technical standard. Samples were characterized using X-ray diffraction, X-ray fluorescence and scanning electron microscopy to identify effects caused by presence of raw materials and the type of molding used. The results show that mineralogical composition and forming technique have an impact on the technological properties of the resulting material. Also it can be seen that for mixtures of raw materials employed in the study, the extrusion technique allows faster glassy phase formation, however this molding technique could be one of the reason for faster recrystallization at high temperatures. The best values for the technological properties were found at temperature of 1150 °C.

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“…Shaping method (molding, pressing, extrusion) used during manufacturing is another factor that affects the porosity of bricks [9]. But, to evaluate the effect of shaping method to porosity is much more complicated since such some other factors such as firing temperature, firing speed also need to be taken into account [9].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of bricks used in the domes of some historic bath buildings

Sağın

Böke

2013

Journal of Cultural Heritage

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a b s t r a c tIn this study, characteristics of bricks used in the domes of some historic bath buildings dated to 15th century inİzmir were determined in order to indicate the properties of repair bricks that will be used in the conservation works of the domes. For this purpose, their basic physical properties, elemental and mineralogical compositions, firing temperatures and microstructural properties were determined by using XRF, XRD, SEM-EDS and TGA analysis. Analysis results indicated that the bricks are of low density, high porosity and were produced from raw materials containing low amounts of calcium poor clays fired at low temperatures (< 900• C). They are mainly consisted of small pores with r < 5 m that make the bricks more susceptible to salt crystallization and freeze-thaw cycles. Although the bricks were fired at low temperatures and susceptible to salt crystallization and freeze thaw cycles, the structural systems of the domes remained without losing their integrity due to the moderate climatic conditions ofİzmir. Repair bricks that will be used in the conservation works of the domes should be compatible with the original ones and produced from calcium poor clays by firing at low temperatures.

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The influence of shaping and firing technology on ceramic properties of calcareous and non-calcareous illitic–chloritic clays

Cited by 119 publications

References 5 publications

Comparison of extruded and pressed low cost ceramic supports for microfiltration membranes

Comparison of extruded and pressed low cost ceramic supports for microfiltration membranes

Influencia de las materias primas y de la técnica de moldeo en la fabricación de productos cerámicos tipo gres

Characteristics of bricks used in the domes of some historic bath buildings

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