Pub Date : 2023-01-02DOI: 10.1080/0371750X.2022.2160375
Yunan Wan, Jianhong Wang, Zhi-yong Li, Hong-ping Zhang
Cement is the most commonly used inorganic cementing material in construction engineering owing to its stable performance; however, cement production requires a considerable amount of energy. To reduce energy consumption, inorganic cementing materials were prepared by solid waste to replace parts of the cement. In this experiment, composite cementing material was prepared by mixing ultrafine fly ash, lime and gypsum; then, this material was hydrated at a calcium-to-silicon (C/S) ratio of 0.6-2.2. The effects of various C/S ratios on the properties of the prepared composite cementing material were investigated. The results showed that when the C/S ratio was 1.6, the compressive and flexural strengths of the composite cementing material reached their maximum. With the increase of C/S ratio, the production of C–S–H gel and ettringite increased; the two products got interwoven, filling the pores of hydration products and increasing the strength of the cementing material. When the C/S ratio was 2.0, the carbonization rate of the cementing materials increased. Calcite coated the surface of the fly ash, preventing the pozzolanic reaction of the fly ash and reducing the overall strength of the material. GRAPHICAL ABSTRACT
水泥性能稳定，是建筑工程中最常用的无机胶结材料;然而，水泥生产需要大量的能源。为降低能耗，采用固体废弃物制备无机胶凝材料替代部分水泥。本试验采用超细粉煤灰、石灰、石膏混合制备复合胶凝材料;然后，将该材料以钙硅比(C/S)为0.6-2.2水化。研究了不同碳硫比对制备的复合胶凝材料性能的影响。结果表明:当C/S比为1.6时，复合胶凝材料的抗压强度和抗弯强度均达到最大;随着C/S比的增加，C - S - h凝胶和钙矾石的产量增加;两种产物相互交织，填充了水化产物的孔隙，提高了胶凝材料的强度。当碳硫比为2.0时，胶凝材料的碳化率增加。方解石包覆在粉煤灰表面，阻止了粉煤灰的火山灰反应，降低了材料的整体强度。图形抽象
{"title":"Effect of the Calcium-Silicon Ratio on the Properties of Composite Cementing Materials","authors":"Yunan Wan, Jianhong Wang, Zhi-yong Li, Hong-ping Zhang","doi":"10.1080/0371750X.2022.2160375","DOIUrl":"https://doi.org/10.1080/0371750X.2022.2160375","url":null,"abstract":"Cement is the most commonly used inorganic cementing material in construction engineering owing to its stable performance; however, cement production requires a considerable amount of energy. To reduce energy consumption, inorganic cementing materials were prepared by solid waste to replace parts of the cement. In this experiment, composite cementing material was prepared by mixing ultrafine fly ash, lime and gypsum; then, this material was hydrated at a calcium-to-silicon (C/S) ratio of 0.6-2.2. The effects of various C/S ratios on the properties of the prepared composite cementing material were investigated. The results showed that when the C/S ratio was 1.6, the compressive and flexural strengths of the composite cementing material reached their maximum. With the increase of C/S ratio, the production of C–S–H gel and ettringite increased; the two products got interwoven, filling the pores of hydration products and increasing the strength of the cementing material. When the C/S ratio was 2.0, the carbonization rate of the cementing materials increased. Calcite coated the surface of the fly ash, preventing the pozzolanic reaction of the fly ash and reducing the overall strength of the material. GRAPHICAL ABSTRACT","PeriodicalId":23233,"journal":{"name":"Transactions of the Indian Ceramic Society","volume":"82 1","pages":"40 - 45"},"PeriodicalIF":1.2,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44563562","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-02DOI: 10.1080/0371750X.2022.2152369
Amirreza Khezrloo, M. Afshar, S. Baghshahi, A. Amadeh
In this research study, to apply uniform and homogenous nanostructured yttriastabilized zirconia (YSZ) coatings on the Inconel 738LC with MCrAlY bond-coat, the effect of electrophoretic parameters was evaluated. Two different suspensions of 3YSZ nanoparticles were prepared in acetylacetone and acetone separately, using an iodine dispersant. The electrophoretic deposition was conducted by applying voltages of 20 V, 50 V and 80 V for 3 min on MCrAlY coated Inconel 738LC. The coatings were sintered for 120 min at 900°, 1000° and 1100°C temperature. The results revealed that the non-uniform coating included some cracks and cavities as the applied voltage exceeded the optimal amount. The results also depicted that the YSZ coating prepared in acetylacetone medium with 0.4 g/L iodine dispersant, voltage of 50 V, coating time of 3 min, and sintering temperature of 1000°C was a uniform and crack-free structure. Furthermore, the results showed that a continuous alumina layer was formed during oxidation. GRAPHICAL ABSTRACT
{"title":"Optimizing Nanostructured Yttria-Stabilized Zirconia Electrophoretic Coatings on MCrAlY Bond-Coated Inconel 738LC Superalloy","authors":"Amirreza Khezrloo, M. Afshar, S. Baghshahi, A. Amadeh","doi":"10.1080/0371750X.2022.2152369","DOIUrl":"https://doi.org/10.1080/0371750X.2022.2152369","url":null,"abstract":"In this research study, to apply uniform and homogenous nanostructured yttriastabilized zirconia (YSZ) coatings on the Inconel 738LC with MCrAlY bond-coat, the effect of electrophoretic parameters was evaluated. Two different suspensions of 3YSZ nanoparticles were prepared in acetylacetone and acetone separately, using an iodine dispersant. The electrophoretic deposition was conducted by applying voltages of 20 V, 50 V and 80 V for 3 min on MCrAlY coated Inconel 738LC. The coatings were sintered for 120 min at 900°, 1000° and 1100°C temperature. The results revealed that the non-uniform coating included some cracks and cavities as the applied voltage exceeded the optimal amount. The results also depicted that the YSZ coating prepared in acetylacetone medium with 0.4 g/L iodine dispersant, voltage of 50 V, coating time of 3 min, and sintering temperature of 1000°C was a uniform and crack-free structure. Furthermore, the results showed that a continuous alumina layer was formed during oxidation. GRAPHICAL ABSTRACT","PeriodicalId":23233,"journal":{"name":"Transactions of the Indian Ceramic Society","volume":"82 1","pages":"21 - 30"},"PeriodicalIF":1.2,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45642668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-02DOI: 10.1080/0371750X.2022.2149625
B. Singh
The intention of this paper is to make a comprehensive discussion on self-lubricating ceramics along with the application of Cu/CuO as a solid lubricant. So, the article starts with a discussion on all the problems associated with conventional solid lubricants and its continual modifications. Furthermore, a new era of solid lubricants, its benefits and why they are recommended ov er conventional lubricants are thoroughly discussed. After this, the discussion starts with the fundamental mechanism along with the underlying physics of the self-lubricating phenomenon and is rev iewed. Later, the discussion highlights the processing method and application of Cu/CuO as a solid lubricant with its experimental results. The discussion also encompasses the effect of testing conditions, counterpart and environmental conditions on the functional properties. Finally, the practical and possible future applications of Cu/CuO as solid-lubricant are discussed. GRAPHICAL ABSTRACT
{"title":"State-of-Art on Self-Lubricating Ceramics and Application of Cu/CuO as Solid Lubricant Material","authors":"B. Singh","doi":"10.1080/0371750X.2022.2149625","DOIUrl":"https://doi.org/10.1080/0371750X.2022.2149625","url":null,"abstract":"The intention of this paper is to make a comprehensive discussion on self-lubricating ceramics along with the application of Cu/CuO as a solid lubricant. So, the article starts with a discussion on all the problems associated with conventional solid lubricants and its continual modifications. Furthermore, a new era of solid lubricants, its benefits and why they are recommended ov er conventional lubricants are thoroughly discussed. After this, the discussion starts with the fundamental mechanism along with the underlying physics of the self-lubricating phenomenon and is rev iewed. Later, the discussion highlights the processing method and application of Cu/CuO as a solid lubricant with its experimental results. The discussion also encompasses the effect of testing conditions, counterpart and environmental conditions on the functional properties. Finally, the practical and possible future applications of Cu/CuO as solid-lubricant are discussed. GRAPHICAL ABSTRACT","PeriodicalId":23233,"journal":{"name":"Transactions of the Indian Ceramic Society","volume":"82 1","pages":"1 - 13"},"PeriodicalIF":1.2,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48442765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-02DOI: 10.1080/0371750X.2023.2173300
Sitendu Mandal, Raktima Chatterjee, Sourav Nag, S. Manna, S. Jana, K. Biswas, B. Ambade
The recycling of the wastes towards value added product development has become a prime challenge. In this work, a low thermal expansion glass-ceramic material based on ternary LAS (Li2O-Al2O3-SiO2) system has been prepared by adopting meltquenching route using industrial waste (blast furnace slag) and low-cost aluminosilicate minerals (China clay and pyrophyllite) at relatively low melting temperature (∼1450°C). A part of the precursor powder for pristine glass has also been prepared by sol-gel processing utilizing Li2CO3 and Al(NO3)3.9H2O to obtain better homogeneity in the glass composition vis-à-vis glass-ceramics at lower melting temperature. Thermal properties of the material have been characterized to optimize the nucleation and crystallization temperatures for converting glass to glass-ceramics. Phase structure and surface morphology of the glass-ceramics have been analyzed by X-ray diffraction (XRD) and field emission scanning electron microscopy. XRD study reveals the presence of lithium aluminosilicate as a major phase at the crystallization temperature of 730°C. The developed glass-ceramics show a low thermal expansion coefficient (CTE) value of (19±0.5)×10–7/°C in the temperature range of 30°-500°C. The present work can unfold an avenue towards conversion of waste into wealth in the form of low CTE glass-ceramics for possible application as cook-top plate of LPG gas oven. GRAPHICAL ABSTRACT
{"title":"Low Expansion Glass-Ceramics Using Industrial Waste and Low-cost Aluminosilicate Minerals: Fabrication and Characterizations","authors":"Sitendu Mandal, Raktima Chatterjee, Sourav Nag, S. Manna, S. Jana, K. Biswas, B. Ambade","doi":"10.1080/0371750X.2023.2173300","DOIUrl":"https://doi.org/10.1080/0371750X.2023.2173300","url":null,"abstract":"The recycling of the wastes towards value added product development has become a prime challenge. In this work, a low thermal expansion glass-ceramic material based on ternary LAS (Li2O-Al2O3-SiO2) system has been prepared by adopting meltquenching route using industrial waste (blast furnace slag) and low-cost aluminosilicate minerals (China clay and pyrophyllite) at relatively low melting temperature (∼1450°C). A part of the precursor powder for pristine glass has also been prepared by sol-gel processing utilizing Li2CO3 and Al(NO3)3.9H2O to obtain better homogeneity in the glass composition vis-à-vis glass-ceramics at lower melting temperature. Thermal properties of the material have been characterized to optimize the nucleation and crystallization temperatures for converting glass to glass-ceramics. Phase structure and surface morphology of the glass-ceramics have been analyzed by X-ray diffraction (XRD) and field emission scanning electron microscopy. XRD study reveals the presence of lithium aluminosilicate as a major phase at the crystallization temperature of 730°C. The developed glass-ceramics show a low thermal expansion coefficient (CTE) value of (19±0.5)×10–7/°C in the temperature range of 30°-500°C. The present work can unfold an avenue towards conversion of waste into wealth in the form of low CTE glass-ceramics for possible application as cook-top plate of LPG gas oven. GRAPHICAL ABSTRACT","PeriodicalId":23233,"journal":{"name":"Transactions of the Indian Ceramic Society","volume":"82 1","pages":"46 - 55"},"PeriodicalIF":1.2,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47646705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-02DOI: 10.1080/0371750X.2022.2149623
Pavitra Rajendran, A. Muthuraj, Nagarajan Erumaipatty Rajagounder
Cerium oxide (CeO2) nanoparticles have emerged as a significant nanomaterial in a wide range of applications, including photocataly sis, corrosion inhibitors, and biological applications. T he corrosion resistance hy brid film based on CeO 2 nanoparticles turns into a more remarkable inhibitor than hazardous chromate-based protective materials. In this review, we present the impact of CeO2 nanoparticles on corrosion protective properties; synthesis of CeO2 nanoparticles by a green and chemical process; protective CeO2 coating deposited on the substrate by different methods; CeO2-based orga nic coa tings; CeO2-based in organi c coa tings and tribological behavior of CeO2. Also, it enlightens the influence of grain size, cracking, pore size, microstructure, and micro-hardness on CeO2-based corrosion coatings. Investigations into the effects of corrosion found that CeO2-based coatings had high potential and a drop in current densities, which are responsible for the inhibitory performance. Additionally, the inclusion of CeO2 nanoparticles results in finer-grained deposits with improved corrosion resistance. M ost CeO2 coatings display good corrosion resistance compared to other potential organic and inorganic composite coatings addressed in this section. GRAPHICAL ABSTRACT
{"title":"Review on CeO2-Based Corrosion Coatings","authors":"Pavitra Rajendran, A. Muthuraj, Nagarajan Erumaipatty Rajagounder","doi":"10.1080/0371750X.2022.2149623","DOIUrl":"https://doi.org/10.1080/0371750X.2022.2149623","url":null,"abstract":"Cerium oxide (CeO2) nanoparticles have emerged as a significant nanomaterial in a wide range of applications, including photocataly sis, corrosion inhibitors, and biological applications. T he corrosion resistance hy brid film based on CeO 2 nanoparticles turns into a more remarkable inhibitor than hazardous chromate-based protective materials. In this review, we present the impact of CeO2 nanoparticles on corrosion protective properties; synthesis of CeO2 nanoparticles by a green and chemical process; protective CeO2 coating deposited on the substrate by different methods; CeO2-based orga nic coa tings; CeO2-based in organi c coa tings and tribological behavior of CeO2. Also, it enlightens the influence of grain size, cracking, pore size, microstructure, and micro-hardness on CeO2-based corrosion coatings. Investigations into the effects of corrosion found that CeO2-based coatings had high potential and a drop in current densities, which are responsible for the inhibitory performance. Additionally, the inclusion of CeO2 nanoparticles results in finer-grained deposits with improved corrosion resistance. M ost CeO2 coatings display good corrosion resistance compared to other potential organic and inorganic composite coatings addressed in this section. GRAPHICAL ABSTRACT","PeriodicalId":23233,"journal":{"name":"Transactions of the Indian Ceramic Society","volume":"81 1","pages":"158 - 174"},"PeriodicalIF":1.2,"publicationDate":"2022-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42549622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-02DOI: 10.1080/0371750X.2022.2149624
S. Baghshahi, Fataneh Yousefi
In this work, for the first time, the effect of magnetite morphology on magnetic and photocatalytic properties of magnetite-titania nanoparticles (Fe3O4-TiO2 NPs) for waste-water purification was studied. Hydrothermal method was used to synthesize magnetite and magnetite-titania nanoparticles, using ferrosulfate heptahydrate and tetraubutyl orthotitanate as magnetite and titania precursors, respectively. X-ray diffractometry and scanning electron microscopy results revealed successful synthesis of spherical (Fe3O4S), cubic (Fe3O4C) and rod-like (Fe3O4R) NPs. Fe3O4C NPs had the highest (66.36 emu.g−1) and Fe3O4R had the lowest (35.11 emu.g−1) saturated magnetism. By depositing titania on the magnetite NPs, saturated magnetism was drastically reduced in the samples. The kinetics of photocatalytic methylene blue (MB) decoloration of the samples followed the first-order model. MB removal efficiency of Fe3O4-TiO2 NPs with spherical, cubic and rod-like magnetite was more than 90, 73 and 64%, respectively, after 120 min irradiation, which shows an excellent improvement compared to similar works. It was interesting that the specific surface area of Fe3O4-TiO2 NPs had a higher influence on photocatalytic activity compared to morphology. The results revealed that Fe3O4C-TiO2 NPs had the highest magnetic saturation, while Fe3O4S-TiO2 NPs had the highest photocatalytic activity. It was found that Fe3O4S-TiO2 NPs had the optimal magnetic and photocatalytic properties, and may potentially be used for wastewater purification. GRAPHICAL ABSTRACT
{"title":"The Effect of Morphology on the Photocatalytic Efficiency of Magnetite-Titania Nanoparticles for Wastewater Purification","authors":"S. Baghshahi, Fataneh Yousefi","doi":"10.1080/0371750X.2022.2149624","DOIUrl":"https://doi.org/10.1080/0371750X.2022.2149624","url":null,"abstract":"In this work, for the first time, the effect of magnetite morphology on magnetic and photocatalytic properties of magnetite-titania nanoparticles (Fe3O4-TiO2 NPs) for waste-water purification was studied. Hydrothermal method was used to synthesize magnetite and magnetite-titania nanoparticles, using ferrosulfate heptahydrate and tetraubutyl orthotitanate as magnetite and titania precursors, respectively. X-ray diffractometry and scanning electron microscopy results revealed successful synthesis of spherical (Fe3O4S), cubic (Fe3O4C) and rod-like (Fe3O4R) NPs. Fe3O4C NPs had the highest (66.36 emu.g−1) and Fe3O4R had the lowest (35.11 emu.g−1) saturated magnetism. By depositing titania on the magnetite NPs, saturated magnetism was drastically reduced in the samples. The kinetics of photocatalytic methylene blue (MB) decoloration of the samples followed the first-order model. MB removal efficiency of Fe3O4-TiO2 NPs with spherical, cubic and rod-like magnetite was more than 90, 73 and 64%, respectively, after 120 min irradiation, which shows an excellent improvement compared to similar works. It was interesting that the specific surface area of Fe3O4-TiO2 NPs had a higher influence on photocatalytic activity compared to morphology. The results revealed that Fe3O4C-TiO2 NPs had the highest magnetic saturation, while Fe3O4S-TiO2 NPs had the highest photocatalytic activity. It was found that Fe3O4S-TiO2 NPs had the optimal magnetic and photocatalytic properties, and may potentially be used for wastewater purification. GRAPHICAL ABSTRACT","PeriodicalId":23233,"journal":{"name":"Transactions of the Indian Ceramic Society","volume":"81 1","pages":"175 - 182"},"PeriodicalIF":1.2,"publicationDate":"2022-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42805454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-02DOI: 10.1080/0371750X.2022.2149627
W. Zheng, Xun Xiang, Yao Wang, Yinhua Cui, Yuan Bao, S. He, Pengfei Li, Chuan Hu
Herein, silica aerogel films were used in the fabrication of surface acoustic wave(SAW) filters for the first time. Firstly, silica aerogel films with various silica sol driptimes were prepared and characterized. According to spectroscopic ellipsometry, therefractive index of an aerogel film with a silica sol drip time of 9 min decreased by5.9% compared with a film with sol drip time of 18 min in the intermediate region ofthe sample. The increase in sol drip time led to an increase in particle size andthickness, and a decrease in pore size. Secondly, four different types of SAW filterswere designed, i.e. covered with either air, poly(dimethylsiloxane) (PDMS), PDMSfilled with silica aerogel powder, or a silica aerogel film. Addition of silica aerogelpowder to PDMS increased the bandwidth of the resulting SAW filter to 2.362 MHz,increased its central frequency to 0.001 GHz and decreased its insertion loss to 1.545dB. Although they had low porosity, the SAW filters covered with silica aerogel filmshad a bandwidth of 60.586 MHz, a central frequency of 2.447 GHz, a Q value of 40.073, and the largest insertion loss of –15.397 dB. SAW filters with silica aerogel films withvarious sol drip times were also tested. The results indicated that more porous thesilica aerogel films, stronger is the signal strength and smaller is the insertion lossof the SAW filter. GRAPHICAL ABSTRACT
{"title":"Application of Silica Aerogel Films to the Fabrication of Surface Acoustic Wave Filters","authors":"W. Zheng, Xun Xiang, Yao Wang, Yinhua Cui, Yuan Bao, S. He, Pengfei Li, Chuan Hu","doi":"10.1080/0371750X.2022.2149627","DOIUrl":"https://doi.org/10.1080/0371750X.2022.2149627","url":null,"abstract":"Herein, silica aerogel films were used in the fabrication of surface acoustic wave(SAW) filters for the first time. Firstly, silica aerogel films with various silica sol driptimes were prepared and characterized. According to spectroscopic ellipsometry, therefractive index of an aerogel film with a silica sol drip time of 9 min decreased by5.9% compared with a film with sol drip time of 18 min in the intermediate region ofthe sample. The increase in sol drip time led to an increase in particle size andthickness, and a decrease in pore size. Secondly, four different types of SAW filterswere designed, i.e. covered with either air, poly(dimethylsiloxane) (PDMS), PDMSfilled with silica aerogel powder, or a silica aerogel film. Addition of silica aerogelpowder to PDMS increased the bandwidth of the resulting SAW filter to 2.362 MHz,increased its central frequency to 0.001 GHz and decreased its insertion loss to 1.545dB. Although they had low porosity, the SAW filters covered with silica aerogel filmshad a bandwidth of 60.586 MHz, a central frequency of 2.447 GHz, a Q value of 40.073, and the largest insertion loss of –15.397 dB. SAW filters with silica aerogel films withvarious sol drip times were also tested. The results indicated that more porous thesilica aerogel films, stronger is the signal strength and smaller is the insertion lossof the SAW filter. GRAPHICAL ABSTRACT","PeriodicalId":23233,"journal":{"name":"Transactions of the Indian Ceramic Society","volume":"81 1","pages":"183 - 189"},"PeriodicalIF":1.2,"publicationDate":"2022-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43322563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-02DOI: 10.1080/0371750X.2022.2133013
Nihan Ercioglu-Akdogan
Ignimbrites (Ahlat Stone) with macro and micro-sized pores possessing independent of each other are volcanic rocks. It is mainly used as a building material because of its excellent insulation and easy to form material. The present study is aimed at producing floor tile which incorporated Ahlat stone as an alternative raw material for the ceramic industry. The effects of the increasing amount of Ahlat stone (1, 3 and 5 wt%) in the recipes on slurry rheology, physical properties of ceramic tiles, and sintering were studied. Chemical components of raw materials and Ahlat stone were determined using X-ray fluorescence spectroscopy and accordingly the recipes were created. The surface morphology of tiles was scanned using scanning electron microscope. When 3% Ahlat stone was added to the recipe, the flexural strength was calculated as 540 kgf.cm−2. This value is 22% higher than the value which is specified in the TSE standards. Therefore, tiles with a longer lifetime and more durability were developed. In addition, the increased amount of Ahlat stone in the recipe reduced the sintering temperature, thus energy saving was achieved during firing. GRAPHICAL ABSTRACT
{"title":"Valorization of Ahlat Stone Wastes in the Production of Ceramic Tiles: Physical-Mechanical Properties","authors":"Nihan Ercioglu-Akdogan","doi":"10.1080/0371750X.2022.2133013","DOIUrl":"https://doi.org/10.1080/0371750X.2022.2133013","url":null,"abstract":"Ignimbrites (Ahlat Stone) with macro and micro-sized pores possessing independent of each other are volcanic rocks. It is mainly used as a building material because of its excellent insulation and easy to form material. The present study is aimed at producing floor tile which incorporated Ahlat stone as an alternative raw material for the ceramic industry. The effects of the increasing amount of Ahlat stone (1, 3 and 5 wt%) in the recipes on slurry rheology, physical properties of ceramic tiles, and sintering were studied. Chemical components of raw materials and Ahlat stone were determined using X-ray fluorescence spectroscopy and accordingly the recipes were created. The surface morphology of tiles was scanned using scanning electron microscope. When 3% Ahlat stone was added to the recipe, the flexural strength was calculated as 540 kgf.cm−2. This value is 22% higher than the value which is specified in the TSE standards. Therefore, tiles with a longer lifetime and more durability were developed. In addition, the increased amount of Ahlat stone in the recipe reduced the sintering temperature, thus energy saving was achieved during firing. GRAPHICAL ABSTRACT","PeriodicalId":23233,"journal":{"name":"Transactions of the Indian Ceramic Society","volume":"81 1","pages":"141 - 148"},"PeriodicalIF":1.2,"publicationDate":"2022-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47602272","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-02DOI: 10.1080/0371750X.2022.2149626
S. Nayak, A. Satapathy, S. Mantry, L. Besra
In the present research, raw marble dust (an ornamental stone waste) with and without pre-mixing of nickel chrome (NiCr) powder are used as the feedstock material to deposit overlay coatings on the mild steel substrates through HVOF spraying technique. The physical as well as mechanical characterizations of the deposited coatings in terms of deposition efficiency, adhesion strength, coating thickness and micro-hardness are done at controlled laboratory conditions. To get an insight to the erosion behavior of the deposited coatings, high temperature solid particle erosion trials on them are carried out as per ASTM G76 considering the test parameter combinations obtained from Taguchi’s L16 orthogonal array. On analyzing the experimental outcomes, impact velocity, NiCr content in the feedstock, erodent temperature and impingement angle are found to be sequentially significant in terms of affecting the wear loss of the coatings. Based on the findings from the analysis, further experimentations are conducted at different levels of the significant control factors to ascertain their effects on the wear rate more precisely. The micrographs of the worn surfaces taken using a scanning electron microscope are studied to identify the possible damage mechanisms causing the erosion loss. GRAPHICAL ABSTRACT
{"title":"Erosion Response of High-Velocity Oxy-Fuel Sprayed Marble Dust-NiCr Coatings","authors":"S. Nayak, A. Satapathy, S. Mantry, L. Besra","doi":"10.1080/0371750X.2022.2149626","DOIUrl":"https://doi.org/10.1080/0371750X.2022.2149626","url":null,"abstract":"In the present research, raw marble dust (an ornamental stone waste) with and without pre-mixing of nickel chrome (NiCr) powder are used as the feedstock material to deposit overlay coatings on the mild steel substrates through HVOF spraying technique. The physical as well as mechanical characterizations of the deposited coatings in terms of deposition efficiency, adhesion strength, coating thickness and micro-hardness are done at controlled laboratory conditions. To get an insight to the erosion behavior of the deposited coatings, high temperature solid particle erosion trials on them are carried out as per ASTM G76 considering the test parameter combinations obtained from Taguchi’s L16 orthogonal array. On analyzing the experimental outcomes, impact velocity, NiCr content in the feedstock, erodent temperature and impingement angle are found to be sequentially significant in terms of affecting the wear loss of the coatings. Based on the findings from the analysis, further experimentations are conducted at different levels of the significant control factors to ascertain their effects on the wear rate more precisely. The micrographs of the worn surfaces taken using a scanning electron microscope are studied to identify the possible damage mechanisms causing the erosion loss. GRAPHICAL ABSTRACT","PeriodicalId":23233,"journal":{"name":"Transactions of the Indian Ceramic Society","volume":"81 1","pages":"149 - 157"},"PeriodicalIF":1.2,"publicationDate":"2022-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43219799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The ongoing pandemic is laying bare dramatic differences in the spread of COVID-19 across seemingly similar urban environments. Identifying the urban determinants that underlie these differences is an open research question, which can contribute to more epidemiologically resilient cities, optimized testing and detection strategies, and effective immunization efforts. Here, we perform a computational analysis of COVID-19 spread in three cities of similar size in New York State (Colonie, New Rochelle, and Utica) aiming to isolate urban determinants of infections and deaths. We develop detailed digital representations of the cities and simulate COVID-19 spread using a complex agent-based model, taking into account differences in spatial layout, mobility, demographics, and occupational structure of the population. By critically comparing pandemic outcomes across the three cities under equivalent initial conditions, we provide compelling evidence in favor of the central role of hospitals. Specifically, with highly efficacious testing and detection, the number and capacity of hospitals, as well as the extent of vaccination of hospital employees are key determinants of COVID-19 spread. The modulating role of these determinants is reduced at lower efficacy of testing and detection, so that the pandemic outcome becomes equivalent across the three cities.
{"title":"Urban Determinants of COVID-19 Spread: a Comparative Study across Three Cities in New York State.","authors":"Agnieszka Truszkowska, Maya Fayed, Sihan Wei, Lorenzo Zino, Sachit Butail, Emanuele Caroppo, Zhong-Ping Jiang, Alessandro Rizzo, Maurizio Porfiri","doi":"10.1007/s11524-022-00623-9","DOIUrl":"10.1007/s11524-022-00623-9","url":null,"abstract":"<p><p>The ongoing pandemic is laying bare dramatic differences in the spread of COVID-19 across seemingly similar urban environments. Identifying the urban determinants that underlie these differences is an open research question, which can contribute to more epidemiologically resilient cities, optimized testing and detection strategies, and effective immunization efforts. Here, we perform a computational analysis of COVID-19 spread in three cities of similar size in New York State (Colonie, New Rochelle, and Utica) aiming to isolate urban determinants of infections and deaths. We develop detailed digital representations of the cities and simulate COVID-19 spread using a complex agent-based model, taking into account differences in spatial layout, mobility, demographics, and occupational structure of the population. By critically comparing pandemic outcomes across the three cities under equivalent initial conditions, we provide compelling evidence in favor of the central role of hospitals. Specifically, with highly efficacious testing and detection, the number and capacity of hospitals, as well as the extent of vaccination of hospital employees are key determinants of COVID-19 spread. The modulating role of these determinants is reduced at lower efficacy of testing and detection, so that the pandemic outcome becomes equivalent across the three cities.</p>","PeriodicalId":23233,"journal":{"name":"Transactions of the Indian Ceramic Society","volume":"34 1","pages":"909-921"},"PeriodicalIF":4.3,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9170119/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81686641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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