The Experts below are selected from a list of 297 Experts worldwide ranked by ideXlab platform
Dino Norberto Boccaccini - One of the best experts on this subject based on the ideXlab platform.
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service life prediction for Refractory Materials
Journal of Materials Science, 2008Co-Authors: Dino Norberto Boccaccini, T D Volkovhusoviae, Maria Cannio, Martin Romagnoli, Ivo Dlouhý, Cristina Leonelli, Paolo Veronesi, Elie Kamseu, Aldo Roberto BoccacciniAbstract:Ultrasonic pulse velocity testing and image analysis were used to predict the thermal stability of cordierite–mullite refractories. Two compositions used as substrates in fast firing of porcelain whiteware, characterized by different microstructure and crack propagation behavior, were investigated. Fracture strength and fracture toughness values were obtained from three point bending test and chevron notched specimen technique, respectively. The measurement of the ultrasonic velocity was used to assess the material degradation with increasing number of thermal-shock cycles and specimen damage was monitored using image analysis to obtain further evidence of material degradation. The correlation between thermo-mechanical properties, ultrasonic velocity, microstructure, crack-propagation behavior and thermal-shock resistance was discussed. A remarkable similarity was found between the variation of ultrasonic velocity (when measured through the length of the Refractory plates) and fracture strength with number of thermal shock cycles. On the other hand, the development of surface microcracking, as monitored by image analysis, is in good agreement with the variation of KIC with the number of thermal-shock cycles. The variation of the \(\frac{d\sigma_{\rm f}}{dE_{\rm dyn}}\) ratio with number of thermal-shock cycles shows the highest gradient of the investigated trends and it is proposed as a promising parameter to differentiate Refractory Materials regarding their different thermal shock behavior. Service life prediction models for Refractory plates, from measured values of ultrasonic velocity and surface damage analysis, were proposed and validated.
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recycling of microwave inertised asbestos containing waste in Refractory Materials
Journal of The European Ceramic Society, 2007Co-Authors: Dino Norberto Boccaccini, Gian Carlo Pellacani, Cristina Leonelli, Marcello Romagnoli, Paolo Veronesi, Maria Rosa Rivasi, Aldo Roberto BoccacciniAbstract:Abstract Asbestos is a health hazard and its removal a priority for pollution prevention. Asbestos containing wastes (ACW) can be transformed into inert silicate phases by means of microwave irradiation. The aim of this investigation was to recycle microwave inertised ACW in mullite–cordierite Refractory Materials. A MgO-rich talc was replaced by inertised asbestos keeping approximately equal oxide composition of the raw Materials. No significant variations of water absorption, linear shrinkage and Young's modulus but a higher occurrence of cordierite phase with the change of raw material was found. This can be considered an important technological result.
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Determination of thermal shock resistance in Refractory Materials by ultrasonic pulse velocity measurement
Journal of The European Ceramic Society, 2006Co-Authors: Dino Norberto Boccaccini, Cristina Leonelli, Marcello Romagnoli, Paolo Veronesi, Elie Kamseu, Gian Carlo PellacaniAbstract:Thermal shock resistance of Refractory Materials is one of the most important parameters in Refractory material characterization since it determines their performance in many applications. Ultrasonic pulse velocity testing was used for non-destructive quantification of thermal shock damage in Refractory plates used as support for the firing of porcelain articles. When Refractory Materials are subjected to the industrial thermal cycles crack nucleation and propagation occurs resulting in loss of strength and material degradation. The formation of cracks decreases the velocity of ultrasonic pulses travelling in the Refractory because it depends on the density and elastic properties of the material. Therefore measuring either of these properties can directly monitor the development of thermal shock damage level. Young's modulus of representative samples was calculated using measured values of ultrasonic velocities obtained by ultrasonic pulse velocity technique. Results were compared with industrial statistical data of thermal shock behaviour of the investigated Materials. The capability of the ultrasonic velocity technique for simple, sensitive, and reliable non-destructive characterisation of thermal shock damage was demonstrated in this investigation.
Gian Carlo Pellacani - One of the best experts on this subject based on the ideXlab platform.
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recycling of microwave inertised asbestos containing waste in Refractory Materials
Journal of The European Ceramic Society, 2007Co-Authors: Dino Norberto Boccaccini, Gian Carlo Pellacani, Cristina Leonelli, Marcello Romagnoli, Paolo Veronesi, Maria Rosa Rivasi, Aldo Roberto BoccacciniAbstract:Abstract Asbestos is a health hazard and its removal a priority for pollution prevention. Asbestos containing wastes (ACW) can be transformed into inert silicate phases by means of microwave irradiation. The aim of this investigation was to recycle microwave inertised ACW in mullite–cordierite Refractory Materials. A MgO-rich talc was replaced by inertised asbestos keeping approximately equal oxide composition of the raw Materials. No significant variations of water absorption, linear shrinkage and Young's modulus but a higher occurrence of cordierite phase with the change of raw material was found. This can be considered an important technological result.
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Determination of thermal shock resistance in Refractory Materials by ultrasonic pulse velocity measurement
Journal of The European Ceramic Society, 2006Co-Authors: Dino Norberto Boccaccini, Cristina Leonelli, Marcello Romagnoli, Paolo Veronesi, Elie Kamseu, Gian Carlo PellacaniAbstract:Thermal shock resistance of Refractory Materials is one of the most important parameters in Refractory material characterization since it determines their performance in many applications. Ultrasonic pulse velocity testing was used for non-destructive quantification of thermal shock damage in Refractory plates used as support for the firing of porcelain articles. When Refractory Materials are subjected to the industrial thermal cycles crack nucleation and propagation occurs resulting in loss of strength and material degradation. The formation of cracks decreases the velocity of ultrasonic pulses travelling in the Refractory because it depends on the density and elastic properties of the material. Therefore measuring either of these properties can directly monitor the development of thermal shock damage level. Young's modulus of representative samples was calculated using measured values of ultrasonic velocities obtained by ultrasonic pulse velocity technique. Results were compared with industrial statistical data of thermal shock behaviour of the investigated Materials. The capability of the ultrasonic velocity technique for simple, sensitive, and reliable non-destructive characterisation of thermal shock damage was demonstrated in this investigation.
Cristina Leonelli - One of the best experts on this subject based on the ideXlab platform.
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service life prediction for Refractory Materials
Journal of Materials Science, 2008Co-Authors: Dino Norberto Boccaccini, T D Volkovhusoviae, Maria Cannio, Martin Romagnoli, Ivo Dlouhý, Cristina Leonelli, Paolo Veronesi, Elie Kamseu, Aldo Roberto BoccacciniAbstract:Ultrasonic pulse velocity testing and image analysis were used to predict the thermal stability of cordierite–mullite refractories. Two compositions used as substrates in fast firing of porcelain whiteware, characterized by different microstructure and crack propagation behavior, were investigated. Fracture strength and fracture toughness values were obtained from three point bending test and chevron notched specimen technique, respectively. The measurement of the ultrasonic velocity was used to assess the material degradation with increasing number of thermal-shock cycles and specimen damage was monitored using image analysis to obtain further evidence of material degradation. The correlation between thermo-mechanical properties, ultrasonic velocity, microstructure, crack-propagation behavior and thermal-shock resistance was discussed. A remarkable similarity was found between the variation of ultrasonic velocity (when measured through the length of the Refractory plates) and fracture strength with number of thermal shock cycles. On the other hand, the development of surface microcracking, as monitored by image analysis, is in good agreement with the variation of KIC with the number of thermal-shock cycles. The variation of the \(\frac{d\sigma_{\rm f}}{dE_{\rm dyn}}\) ratio with number of thermal-shock cycles shows the highest gradient of the investigated trends and it is proposed as a promising parameter to differentiate Refractory Materials regarding their different thermal shock behavior. Service life prediction models for Refractory plates, from measured values of ultrasonic velocity and surface damage analysis, were proposed and validated.
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recycling of microwave inertised asbestos containing waste in Refractory Materials
Journal of The European Ceramic Society, 2007Co-Authors: Dino Norberto Boccaccini, Gian Carlo Pellacani, Cristina Leonelli, Marcello Romagnoli, Paolo Veronesi, Maria Rosa Rivasi, Aldo Roberto BoccacciniAbstract:Abstract Asbestos is a health hazard and its removal a priority for pollution prevention. Asbestos containing wastes (ACW) can be transformed into inert silicate phases by means of microwave irradiation. The aim of this investigation was to recycle microwave inertised ACW in mullite–cordierite Refractory Materials. A MgO-rich talc was replaced by inertised asbestos keeping approximately equal oxide composition of the raw Materials. No significant variations of water absorption, linear shrinkage and Young's modulus but a higher occurrence of cordierite phase with the change of raw material was found. This can be considered an important technological result.
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Determination of thermal shock resistance in Refractory Materials by ultrasonic pulse velocity measurement
Journal of The European Ceramic Society, 2006Co-Authors: Dino Norberto Boccaccini, Cristina Leonelli, Marcello Romagnoli, Paolo Veronesi, Elie Kamseu, Gian Carlo PellacaniAbstract:Thermal shock resistance of Refractory Materials is one of the most important parameters in Refractory material characterization since it determines their performance in many applications. Ultrasonic pulse velocity testing was used for non-destructive quantification of thermal shock damage in Refractory plates used as support for the firing of porcelain articles. When Refractory Materials are subjected to the industrial thermal cycles crack nucleation and propagation occurs resulting in loss of strength and material degradation. The formation of cracks decreases the velocity of ultrasonic pulses travelling in the Refractory because it depends on the density and elastic properties of the material. Therefore measuring either of these properties can directly monitor the development of thermal shock damage level. Young's modulus of representative samples was calculated using measured values of ultrasonic velocities obtained by ultrasonic pulse velocity technique. Results were compared with industrial statistical data of thermal shock behaviour of the investigated Materials. The capability of the ultrasonic velocity technique for simple, sensitive, and reliable non-destructive characterisation of thermal shock damage was demonstrated in this investigation.
Paolo Veronesi - One of the best experts on this subject based on the ideXlab platform.
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service life prediction for Refractory Materials
Journal of Materials Science, 2008Co-Authors: Dino Norberto Boccaccini, T D Volkovhusoviae, Maria Cannio, Martin Romagnoli, Ivo Dlouhý, Cristina Leonelli, Paolo Veronesi, Elie Kamseu, Aldo Roberto BoccacciniAbstract:Ultrasonic pulse velocity testing and image analysis were used to predict the thermal stability of cordierite–mullite refractories. Two compositions used as substrates in fast firing of porcelain whiteware, characterized by different microstructure and crack propagation behavior, were investigated. Fracture strength and fracture toughness values were obtained from three point bending test and chevron notched specimen technique, respectively. The measurement of the ultrasonic velocity was used to assess the material degradation with increasing number of thermal-shock cycles and specimen damage was monitored using image analysis to obtain further evidence of material degradation. The correlation between thermo-mechanical properties, ultrasonic velocity, microstructure, crack-propagation behavior and thermal-shock resistance was discussed. A remarkable similarity was found between the variation of ultrasonic velocity (when measured through the length of the Refractory plates) and fracture strength with number of thermal shock cycles. On the other hand, the development of surface microcracking, as monitored by image analysis, is in good agreement with the variation of KIC with the number of thermal-shock cycles. The variation of the \(\frac{d\sigma_{\rm f}}{dE_{\rm dyn}}\) ratio with number of thermal-shock cycles shows the highest gradient of the investigated trends and it is proposed as a promising parameter to differentiate Refractory Materials regarding their different thermal shock behavior. Service life prediction models for Refractory plates, from measured values of ultrasonic velocity and surface damage analysis, were proposed and validated.
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recycling of microwave inertised asbestos containing waste in Refractory Materials
Journal of The European Ceramic Society, 2007Co-Authors: Dino Norberto Boccaccini, Gian Carlo Pellacani, Cristina Leonelli, Marcello Romagnoli, Paolo Veronesi, Maria Rosa Rivasi, Aldo Roberto BoccacciniAbstract:Abstract Asbestos is a health hazard and its removal a priority for pollution prevention. Asbestos containing wastes (ACW) can be transformed into inert silicate phases by means of microwave irradiation. The aim of this investigation was to recycle microwave inertised ACW in mullite–cordierite Refractory Materials. A MgO-rich talc was replaced by inertised asbestos keeping approximately equal oxide composition of the raw Materials. No significant variations of water absorption, linear shrinkage and Young's modulus but a higher occurrence of cordierite phase with the change of raw material was found. This can be considered an important technological result.
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Determination of thermal shock resistance in Refractory Materials by ultrasonic pulse velocity measurement
Journal of The European Ceramic Society, 2006Co-Authors: Dino Norberto Boccaccini, Cristina Leonelli, Marcello Romagnoli, Paolo Veronesi, Elie Kamseu, Gian Carlo PellacaniAbstract:Thermal shock resistance of Refractory Materials is one of the most important parameters in Refractory material characterization since it determines their performance in many applications. Ultrasonic pulse velocity testing was used for non-destructive quantification of thermal shock damage in Refractory plates used as support for the firing of porcelain articles. When Refractory Materials are subjected to the industrial thermal cycles crack nucleation and propagation occurs resulting in loss of strength and material degradation. The formation of cracks decreases the velocity of ultrasonic pulses travelling in the Refractory because it depends on the density and elastic properties of the material. Therefore measuring either of these properties can directly monitor the development of thermal shock damage level. Young's modulus of representative samples was calculated using measured values of ultrasonic velocities obtained by ultrasonic pulse velocity technique. Results were compared with industrial statistical data of thermal shock behaviour of the investigated Materials. The capability of the ultrasonic velocity technique for simple, sensitive, and reliable non-destructive characterisation of thermal shock damage was demonstrated in this investigation.
Juntong Huang - One of the best experts on this subject based on the ideXlab platform.
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effect of al2o3 addition on properties of non sintered sic si3n4 composite Refractory Materials
International Journal of Refractory Metals & Hard Materials, 2014Co-Authors: Jian Chen, Kai Chen, Yangai Liu, Zhaohui Huang, Minghao Fang, Juntong HuangAbstract:Abstract Preparation of SiC–Si 3 N 4 composite Refractory Materials without sintering entails only low energy consumption and incurs little cost compared with traditional preparation methods. This paper investigated the effect of Al 2 O 3 addition on bulk density, apparent porosity, linear shrinkage and oxidation resistance of as-fabricated non-sintered SiC–Si 3 N 4 composite Refractory Materials. Meanwhile, the compressive and flexural strengths both before and after heat treatment were analyzed. The mechanisms of oxidation resistance and cryolite resistance of the SiC–Si 3 N 4 composite Refractory Materials are discussed. Increasing amounts of Al 2 O 3 reduced linear shrinkage but increased oxidation resistance and cryolite resistance. Moreover, compressive and flexural strengths initially increased and then decreased, with maximum values achieved at an Al 2 O 3 addition of 8% w/w.
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Effect of Al2O3 addition on properties of non-sintered SiC–Si3N4 composite Refractory Materials
International Journal of Refractory Metals and Hard Materials, 2014Co-Authors: Jian Chen, Kai Chen, Yangai Liu, Zhaohui Huang, Minghao Fang, Juntong HuangAbstract:Abstract Preparation of SiC–Si 3 N 4 composite Refractory Materials without sintering entails only low energy consumption and incurs little cost compared with traditional preparation methods. This paper investigated the effect of Al 2 O 3 addition on bulk density, apparent porosity, linear shrinkage and oxidation resistance of as-fabricated non-sintered SiC–Si 3 N 4 composite Refractory Materials. Meanwhile, the compressive and flexural strengths both before and after heat treatment were analyzed. The mechanisms of oxidation resistance and cryolite resistance of the SiC–Si 3 N 4 composite Refractory Materials are discussed. Increasing amounts of Al 2 O 3 reduced linear shrinkage but increased oxidation resistance and cryolite resistance. Moreover, compressive and flexural strengths initially increased and then decreased, with maximum values achieved at an Al 2 O 3 addition of 8% w/w.
