The Experts below are selected from a list of 138 Experts worldwide ranked by ideXlab platform

Fouad Zargouni - One of the best experts on this subject based on the ideXlab platform.

  • Characterization, firing behavior and Ceramic Application of clays from the Gabes region in South Tunisia
    Applied Clay Science, 2017
    Co-Authors: Salah Mahmoudi, A. Bennour, E. Srasra, Fouad Zargouni
    Abstract:

    Abstract In this study, a part of paper has been conducted on geological survey of Gabes clays and their surroundings; so we can focus on the highest thicknesses of clay sediments, for subsequent investigation or exploration. The greatest part of work focuses on the mineralogical, chemical, physical, and geotechnical tests carried out on Creatceous clays collected from the Zimlet El Beida in Gabes area (South-eastern Tunisia). Firing behavior and Ceramic Application are also conducted for these clay materials. The mineralogy study shows illitic clays; however, other clay minerals, such as kaolinite, mixed-layer I/Sm and chlorite are also present. The mineralogical phases during the firing process were recorded at 300, 600, 800, 1000 and 1150 °C for 3 h with heating rate of 10 °C/min. The main transformations were observed at 1000 °C with the appearance of new crystalline phases, such as diopsite, cristobalite, mullite and spinel. The chemical analysis indicates that these clays are notably siliceous. The alkali content (K 2 O + Na 2 O) is high (~ 4.13%), thus explaining why these clays can be fired at relatively low temperatures. The amount of alumina and iron oxide, with an average of 16.42 and 7.07% respectively, is variable. The tests show that these clays have medium plasticity values (PI = 14–20%). The firing shrinkage and the expansion are limited. A lower firing and drying temperature can be translated into significant energy savings. Technical tests show that the properties fall within the Ceramic International Standards (ISO). Ceramic tiles made of these clays have appropriate characteristics without defects and can be classified in group BIII and BIIb according to the European Standard NF EN 159 (1991).

  • Characterization and traditional Ceramic Application of clays from the Douiret region in South Tunisia
    Applied Clay Science, 2016
    Co-Authors: Salah Mahmoudi, A. Bennour, E. Srasra, A. Meguebli, Fouad Zargouni
    Abstract:

    Abstract This study of the Aptian clays of Douiret (south-east of Tunisia) and their use in Ceramic industry is original. At first, mineralogical, chemical, physical and thermal analyses of these clays are given. In terms of mineralogy, they can be considered as illitic clays (50–67%). However, other clay minerals, such as kaolinite, I/Sm mixed-layer, quartz, feldspar, dolomite and hematite, are present in small quantities. Next, this study reveals that the average amounts of silica and potassium are 53.9% and 3.3% respectively. The amount of alumina and iron oxide, with an average of 16.8% and 6.3% respectively, is variable. The plasticity test shows a high value (PI = 39–56%). The mineralogical changes during the firing process were recorded via the X-ray diffraction of the raw clays and subsequent firing at 300, 700, 800, 900 and 1150 °C for 3 h with heating rate of 10 °C/min. The main transformations were observed at 900 °C with the appearance of new crystalline phases especially mullite, anortite and spinel. Technical tests show that the properties fall within the Ceramic International Standards (ISO). Finally, Ceramic tiles and bricks prepared from these clays have suitable characteristics without defects and can be classified in group BIII according to the European Standard NF EN 159 (1991).

  • Identification and Ceramic Application of Some Tunisian Clays
    Open Access Library Journal, 2015
    Co-Authors: Salah Mahmoudi, Ezzeddine Srasra, Fouad Zargouni
    Abstract:

    Mineralogy, chemistry, and plasticity of the raw clay materials, outcropping in different Tunisian domains were studied. These clays constitute the only mineral resource of the Ceramic industries in Tunisia, and are exploitable at eight quarries. Powder X-ray diffraction analysis revealed that illite and kaolinite are the major mineral phases. However, other clay minerals, such as illite/ smectite mixed-layer, and chlorite are also present. The associated minerals detected in powdered materials are: quartz, calcite, feldspar and, dolomite. These raw materials are marly clays with 6% - 14% CaO, represented essentially by calcite; they show the greatest relative amount of Na2O K2O (~3.5%) and iron-oxide (~6%). The plasticity index and liquid limit of crude samples do not exceed 22% and 42%, respectively. This indicates that these clays belong to the zone of illitic clays, classified in the low to moderate plastic domain. The analysis will be used to find appropriate Applications for traditional Ceramic. In addition, this paper shows that the Ceramic defects observed in the pieces manufactured from these Tunisian clays are lamination, cracks, and lower mechanical and bending strength. Some solutions are assured to avoid these Ceramic defects.

  • Identification and traditional Ceramic Application of clays from the Chouamekh region in south-eastern Tunisia
    Applied Clay Science, 2015
    Co-Authors: A. Bennour, Salah Mahmoudi, E. Srasra, N. Hatira, S. Boussen, M. Ouaja, Fouad Zargouni
    Abstract:

    Abstract For the first time, Permo-Triassic clays collected from the Chouamekh region in south-eastern Tunisia have been studied for their possible use in the Ceramic industry. In terms of mineralogy, they can be considered illitic clays. However, other clay minerals, such as kaolinite, I/Sm mixed-layer and chlorite are also present. The chemical analysis indicates that these clays are notably siliceous. The alkali content (K 2 O + Na 2 O) is high (~ 4.2%), thus explaining why these clays can be fired at relatively low temperatures. The amount of alumina and iron oxide, with an average of 15% and 6.3% respectively, is variable. The tests show that these clays have low to medium plasticity values (PI = 11–28%). The firing shrinkage and the expansion are limited. A lower firing and drying temperature can be translated into significant energy savings. Technical tests show that the properties fall within the Ceramic International Standards (ISO). Ceramic tiles and bricks prepared from these clays have suitable characteristics without defects and can be classified in group BIII according to the European Standard NF EN159 (1991).

Salah Mahmoudi - One of the best experts on this subject based on the ideXlab platform.

  • Characterization, firing behavior and Ceramic Application of clays from the Gabes region in South Tunisia
    Applied Clay Science, 2017
    Co-Authors: Salah Mahmoudi, A. Bennour, E. Srasra, Fouad Zargouni
    Abstract:

    Abstract In this study, a part of paper has been conducted on geological survey of Gabes clays and their surroundings; so we can focus on the highest thicknesses of clay sediments, for subsequent investigation or exploration. The greatest part of work focuses on the mineralogical, chemical, physical, and geotechnical tests carried out on Creatceous clays collected from the Zimlet El Beida in Gabes area (South-eastern Tunisia). Firing behavior and Ceramic Application are also conducted for these clay materials. The mineralogy study shows illitic clays; however, other clay minerals, such as kaolinite, mixed-layer I/Sm and chlorite are also present. The mineralogical phases during the firing process were recorded at 300, 600, 800, 1000 and 1150 °C for 3 h with heating rate of 10 °C/min. The main transformations were observed at 1000 °C with the appearance of new crystalline phases, such as diopsite, cristobalite, mullite and spinel. The chemical analysis indicates that these clays are notably siliceous. The alkali content (K 2 O + Na 2 O) is high (~ 4.13%), thus explaining why these clays can be fired at relatively low temperatures. The amount of alumina and iron oxide, with an average of 16.42 and 7.07% respectively, is variable. The tests show that these clays have medium plasticity values (PI = 14–20%). The firing shrinkage and the expansion are limited. A lower firing and drying temperature can be translated into significant energy savings. Technical tests show that the properties fall within the Ceramic International Standards (ISO). Ceramic tiles made of these clays have appropriate characteristics without defects and can be classified in group BIII and BIIb according to the European Standard NF EN 159 (1991).

  • Characterization and traditional Ceramic Application of clays from the Douiret region in South Tunisia
    Applied Clay Science, 2016
    Co-Authors: Salah Mahmoudi, A. Bennour, E. Srasra, A. Meguebli, Fouad Zargouni
    Abstract:

    Abstract This study of the Aptian clays of Douiret (south-east of Tunisia) and their use in Ceramic industry is original. At first, mineralogical, chemical, physical and thermal analyses of these clays are given. In terms of mineralogy, they can be considered as illitic clays (50–67%). However, other clay minerals, such as kaolinite, I/Sm mixed-layer, quartz, feldspar, dolomite and hematite, are present in small quantities. Next, this study reveals that the average amounts of silica and potassium are 53.9% and 3.3% respectively. The amount of alumina and iron oxide, with an average of 16.8% and 6.3% respectively, is variable. The plasticity test shows a high value (PI = 39–56%). The mineralogical changes during the firing process were recorded via the X-ray diffraction of the raw clays and subsequent firing at 300, 700, 800, 900 and 1150 °C for 3 h with heating rate of 10 °C/min. The main transformations were observed at 900 °C with the appearance of new crystalline phases especially mullite, anortite and spinel. Technical tests show that the properties fall within the Ceramic International Standards (ISO). Finally, Ceramic tiles and bricks prepared from these clays have suitable characteristics without defects and can be classified in group BIII according to the European Standard NF EN 159 (1991).

  • Identification and Ceramic Application of Some Tunisian Clays
    Open Access Library Journal, 2015
    Co-Authors: Salah Mahmoudi, Ezzeddine Srasra, Fouad Zargouni
    Abstract:

    Mineralogy, chemistry, and plasticity of the raw clay materials, outcropping in different Tunisian domains were studied. These clays constitute the only mineral resource of the Ceramic industries in Tunisia, and are exploitable at eight quarries. Powder X-ray diffraction analysis revealed that illite and kaolinite are the major mineral phases. However, other clay minerals, such as illite/ smectite mixed-layer, and chlorite are also present. The associated minerals detected in powdered materials are: quartz, calcite, feldspar and, dolomite. These raw materials are marly clays with 6% - 14% CaO, represented essentially by calcite; they show the greatest relative amount of Na2O K2O (~3.5%) and iron-oxide (~6%). The plasticity index and liquid limit of crude samples do not exceed 22% and 42%, respectively. This indicates that these clays belong to the zone of illitic clays, classified in the low to moderate plastic domain. The analysis will be used to find appropriate Applications for traditional Ceramic. In addition, this paper shows that the Ceramic defects observed in the pieces manufactured from these Tunisian clays are lamination, cracks, and lower mechanical and bending strength. Some solutions are assured to avoid these Ceramic defects.

  • Identification and traditional Ceramic Application of clays from the Chouamekh region in south-eastern Tunisia
    Applied Clay Science, 2015
    Co-Authors: A. Bennour, Salah Mahmoudi, E. Srasra, N. Hatira, S. Boussen, M. Ouaja, Fouad Zargouni
    Abstract:

    Abstract For the first time, Permo-Triassic clays collected from the Chouamekh region in south-eastern Tunisia have been studied for their possible use in the Ceramic industry. In terms of mineralogy, they can be considered illitic clays. However, other clay minerals, such as kaolinite, I/Sm mixed-layer and chlorite are also present. The chemical analysis indicates that these clays are notably siliceous. The alkali content (K 2 O + Na 2 O) is high (~ 4.2%), thus explaining why these clays can be fired at relatively low temperatures. The amount of alumina and iron oxide, with an average of 15% and 6.3% respectively, is variable. The tests show that these clays have low to medium plasticity values (PI = 11–28%). The firing shrinkage and the expansion are limited. A lower firing and drying temperature can be translated into significant energy savings. Technical tests show that the properties fall within the Ceramic International Standards (ISO). Ceramic tiles and bricks prepared from these clays have suitable characteristics without defects and can be classified in group BIII according to the European Standard NF EN159 (1991).

A. Bennour - One of the best experts on this subject based on the ideXlab platform.

  • Characterization, firing behavior and Ceramic Application of clays from the Gabes region in South Tunisia
    Applied Clay Science, 2017
    Co-Authors: Salah Mahmoudi, A. Bennour, E. Srasra, Fouad Zargouni
    Abstract:

    Abstract In this study, a part of paper has been conducted on geological survey of Gabes clays and their surroundings; so we can focus on the highest thicknesses of clay sediments, for subsequent investigation or exploration. The greatest part of work focuses on the mineralogical, chemical, physical, and geotechnical tests carried out on Creatceous clays collected from the Zimlet El Beida in Gabes area (South-eastern Tunisia). Firing behavior and Ceramic Application are also conducted for these clay materials. The mineralogy study shows illitic clays; however, other clay minerals, such as kaolinite, mixed-layer I/Sm and chlorite are also present. The mineralogical phases during the firing process were recorded at 300, 600, 800, 1000 and 1150 °C for 3 h with heating rate of 10 °C/min. The main transformations were observed at 1000 °C with the appearance of new crystalline phases, such as diopsite, cristobalite, mullite and spinel. The chemical analysis indicates that these clays are notably siliceous. The alkali content (K 2 O + Na 2 O) is high (~ 4.13%), thus explaining why these clays can be fired at relatively low temperatures. The amount of alumina and iron oxide, with an average of 16.42 and 7.07% respectively, is variable. The tests show that these clays have medium plasticity values (PI = 14–20%). The firing shrinkage and the expansion are limited. A lower firing and drying temperature can be translated into significant energy savings. Technical tests show that the properties fall within the Ceramic International Standards (ISO). Ceramic tiles made of these clays have appropriate characteristics without defects and can be classified in group BIII and BIIb according to the European Standard NF EN 159 (1991).

  • Characterization and traditional Ceramic Application of clays from the Douiret region in South Tunisia
    Applied Clay Science, 2016
    Co-Authors: Salah Mahmoudi, A. Bennour, E. Srasra, A. Meguebli, Fouad Zargouni
    Abstract:

    Abstract This study of the Aptian clays of Douiret (south-east of Tunisia) and their use in Ceramic industry is original. At first, mineralogical, chemical, physical and thermal analyses of these clays are given. In terms of mineralogy, they can be considered as illitic clays (50–67%). However, other clay minerals, such as kaolinite, I/Sm mixed-layer, quartz, feldspar, dolomite and hematite, are present in small quantities. Next, this study reveals that the average amounts of silica and potassium are 53.9% and 3.3% respectively. The amount of alumina and iron oxide, with an average of 16.8% and 6.3% respectively, is variable. The plasticity test shows a high value (PI = 39–56%). The mineralogical changes during the firing process were recorded via the X-ray diffraction of the raw clays and subsequent firing at 300, 700, 800, 900 and 1150 °C for 3 h with heating rate of 10 °C/min. The main transformations were observed at 900 °C with the appearance of new crystalline phases especially mullite, anortite and spinel. Technical tests show that the properties fall within the Ceramic International Standards (ISO). Finally, Ceramic tiles and bricks prepared from these clays have suitable characteristics without defects and can be classified in group BIII according to the European Standard NF EN 159 (1991).

  • Identification and traditional Ceramic Application of clays from the Chouamekh region in south-eastern Tunisia
    Applied Clay Science, 2015
    Co-Authors: A. Bennour, Salah Mahmoudi, E. Srasra, N. Hatira, S. Boussen, M. Ouaja, Fouad Zargouni
    Abstract:

    Abstract For the first time, Permo-Triassic clays collected from the Chouamekh region in south-eastern Tunisia have been studied for their possible use in the Ceramic industry. In terms of mineralogy, they can be considered illitic clays. However, other clay minerals, such as kaolinite, I/Sm mixed-layer and chlorite are also present. The chemical analysis indicates that these clays are notably siliceous. The alkali content (K 2 O + Na 2 O) is high (~ 4.2%), thus explaining why these clays can be fired at relatively low temperatures. The amount of alumina and iron oxide, with an average of 15% and 6.3% respectively, is variable. The tests show that these clays have low to medium plasticity values (PI = 11–28%). The firing shrinkage and the expansion are limited. A lower firing and drying temperature can be translated into significant energy savings. Technical tests show that the properties fall within the Ceramic International Standards (ISO). Ceramic tiles and bricks prepared from these clays have suitable characteristics without defects and can be classified in group BIII according to the European Standard NF EN159 (1991).

E. Srasra - One of the best experts on this subject based on the ideXlab platform.

  • Characterization, firing behavior and Ceramic Application of clays from the Gabes region in South Tunisia
    Applied Clay Science, 2017
    Co-Authors: Salah Mahmoudi, A. Bennour, E. Srasra, Fouad Zargouni
    Abstract:

    Abstract In this study, a part of paper has been conducted on geological survey of Gabes clays and their surroundings; so we can focus on the highest thicknesses of clay sediments, for subsequent investigation or exploration. The greatest part of work focuses on the mineralogical, chemical, physical, and geotechnical tests carried out on Creatceous clays collected from the Zimlet El Beida in Gabes area (South-eastern Tunisia). Firing behavior and Ceramic Application are also conducted for these clay materials. The mineralogy study shows illitic clays; however, other clay minerals, such as kaolinite, mixed-layer I/Sm and chlorite are also present. The mineralogical phases during the firing process were recorded at 300, 600, 800, 1000 and 1150 °C for 3 h with heating rate of 10 °C/min. The main transformations were observed at 1000 °C with the appearance of new crystalline phases, such as diopsite, cristobalite, mullite and spinel. The chemical analysis indicates that these clays are notably siliceous. The alkali content (K 2 O + Na 2 O) is high (~ 4.13%), thus explaining why these clays can be fired at relatively low temperatures. The amount of alumina and iron oxide, with an average of 16.42 and 7.07% respectively, is variable. The tests show that these clays have medium plasticity values (PI = 14–20%). The firing shrinkage and the expansion are limited. A lower firing and drying temperature can be translated into significant energy savings. Technical tests show that the properties fall within the Ceramic International Standards (ISO). Ceramic tiles made of these clays have appropriate characteristics without defects and can be classified in group BIII and BIIb according to the European Standard NF EN 159 (1991).

  • Characterization and traditional Ceramic Application of clays from the Douiret region in South Tunisia
    Applied Clay Science, 2016
    Co-Authors: Salah Mahmoudi, A. Bennour, E. Srasra, A. Meguebli, Fouad Zargouni
    Abstract:

    Abstract This study of the Aptian clays of Douiret (south-east of Tunisia) and their use in Ceramic industry is original. At first, mineralogical, chemical, physical and thermal analyses of these clays are given. In terms of mineralogy, they can be considered as illitic clays (50–67%). However, other clay minerals, such as kaolinite, I/Sm mixed-layer, quartz, feldspar, dolomite and hematite, are present in small quantities. Next, this study reveals that the average amounts of silica and potassium are 53.9% and 3.3% respectively. The amount of alumina and iron oxide, with an average of 16.8% and 6.3% respectively, is variable. The plasticity test shows a high value (PI = 39–56%). The mineralogical changes during the firing process were recorded via the X-ray diffraction of the raw clays and subsequent firing at 300, 700, 800, 900 and 1150 °C for 3 h with heating rate of 10 °C/min. The main transformations were observed at 900 °C with the appearance of new crystalline phases especially mullite, anortite and spinel. Technical tests show that the properties fall within the Ceramic International Standards (ISO). Finally, Ceramic tiles and bricks prepared from these clays have suitable characteristics without defects and can be classified in group BIII according to the European Standard NF EN 159 (1991).

  • Identification and traditional Ceramic Application of clays from the Chouamekh region in south-eastern Tunisia
    Applied Clay Science, 2015
    Co-Authors: A. Bennour, Salah Mahmoudi, E. Srasra, N. Hatira, S. Boussen, M. Ouaja, Fouad Zargouni
    Abstract:

    Abstract For the first time, Permo-Triassic clays collected from the Chouamekh region in south-eastern Tunisia have been studied for their possible use in the Ceramic industry. In terms of mineralogy, they can be considered illitic clays. However, other clay minerals, such as kaolinite, I/Sm mixed-layer and chlorite are also present. The chemical analysis indicates that these clays are notably siliceous. The alkali content (K 2 O + Na 2 O) is high (~ 4.2%), thus explaining why these clays can be fired at relatively low temperatures. The amount of alumina and iron oxide, with an average of 15% and 6.3% respectively, is variable. The tests show that these clays have low to medium plasticity values (PI = 11–28%). The firing shrinkage and the expansion are limited. A lower firing and drying temperature can be translated into significant energy savings. Technical tests show that the properties fall within the Ceramic International Standards (ISO). Ceramic tiles and bricks prepared from these clays have suitable characteristics without defects and can be classified in group BIII according to the European Standard NF EN159 (1991).

Ajit R. Kulkarni - One of the best experts on this subject based on the ideXlab platform.

  • Synthesis and Characterization of Crystallizable Anorthite-Based Glass for a Low-Temperature Cofired Ceramic Application
    Journal of the American Ceramic Society, 2008
    Co-Authors: C. J. Dileep Kumar, N. Raghu, E. K. Sunny, N. Venkataramani, Ajit R. Kulkarni
    Abstract:

    We report successful identification and preparation of a glass composition in the CaO-Al 2 O 3 -SiO 2 phase diagram with a judicious choice of fluxes that met all dielectric, electrical, and thermal property requirements for low-temperature cofired Ceramic (LTCC) Applications. The glass composition sintered at 900°C attains good density (2.45 g/cc) and does not precipitate any crystalline phase. However, when this glass powder is sintered at the same temperature in the presence of 30 vol% cordierite, crystallization of the anorthite phase is observed, which improves the properties of the composite for LTCC Application.