Pub Date : 2021-07-03DOI: 10.1080/0371750X.2021.1915873
Theerthagiri Viswanathan, S. Pal, A. Rahaman, P. Pal
Nanocrystalline spinel forming precursor spinel hydrate (PSH), prepared by co-precipitation technique with controlled concentration of mixed salt, pH, temperature and time, was used as additive in calcined alumina-dead burnt magnesia (DBM) admixture to develop spinel (MgAl2O4) aggregates. Powder granulometry, mixing and dispersion of additive PSH were controlled during milling. Three batches of varying particle size distribution with same proportion of additive were used for body making. Firing was conducted in 1500°-1650°C temperature range. True specific gravity (TSG) of alumina, DBM, spinel and individual fired pellets were used to estimate wt% spinel formation based on the derived mass balance equation and subsequently verified by X-ray diffraction (XRD) analysis. Fired properties, i.e. bulk density, apparent porosity, closed porosity, %linear shrinkage and densification rate were measured. XRD was conducted for phase analysis. SEM and HR-TEM were performed to study the grain/ pore morphology and elemental analysis was done to calculate the spinel stoichiometry. PSH was found to have positive effect both in spinellization and densification; the effect gradually decreased with finer particle size distribution and increasing firing temperatures. The maximum fired density achieved for three batches were 89.21, 92.84 and 96.2% ρth, respectively. Based on the requirements of specific powder granulometry, addition of PSH and firing schedule can be used for bulk production of spinel aggregates. GRAPHICAL ABSTRACT
{"title":"Effect of Nanocrystalline Magnesium Aluminate Precursor and Powder Granulometryon Spinellization and Densification to Develop Magnesium Aluminate Spinel Aggregates","authors":"Theerthagiri Viswanathan, S. Pal, A. Rahaman, P. Pal","doi":"10.1080/0371750X.2021.1915873","DOIUrl":"https://doi.org/10.1080/0371750X.2021.1915873","url":null,"abstract":"Nanocrystalline spinel forming precursor spinel hydrate (PSH), prepared by co-precipitation technique with controlled concentration of mixed salt, pH, temperature and time, was used as additive in calcined alumina-dead burnt magnesia (DBM) admixture to develop spinel (MgAl2O4) aggregates. Powder granulometry, mixing and dispersion of additive PSH were controlled during milling. Three batches of varying particle size distribution with same proportion of additive were used for body making. Firing was conducted in 1500°-1650°C temperature range. True specific gravity (TSG) of alumina, DBM, spinel and individual fired pellets were used to estimate wt% spinel formation based on the derived mass balance equation and subsequently verified by X-ray diffraction (XRD) analysis. Fired properties, i.e. bulk density, apparent porosity, closed porosity, %linear shrinkage and densification rate were measured. XRD was conducted for phase analysis. SEM and HR-TEM were performed to study the grain/ pore morphology and elemental analysis was done to calculate the spinel stoichiometry. PSH was found to have positive effect both in spinellization and densification; the effect gradually decreased with finer particle size distribution and increasing firing temperatures. The maximum fired density achieved for three batches were 89.21, 92.84 and 96.2% ρth, respectively. Based on the requirements of specific powder granulometry, addition of PSH and firing schedule can be used for bulk production of spinel aggregates. GRAPHICAL ABSTRACT","PeriodicalId":23233,"journal":{"name":"Transactions of the Indian Ceramic Society","volume":"80 1","pages":"174 - 185"},"PeriodicalIF":1.2,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42831222","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 : 2021-07-03DOI: 10.1080/0371750X.2021.1952110
Jingren Li, Wen‐Zhong Lu, Hai Jiang
In pursuit of high thermal conductivity of SiC ceramics, this article reports the effects of AlN and sintering atmospheres on the thermal properties and microstructure evolution of SiC ceramics. Dense SiC ceramics with different contents of AlN additive were fabricated through hot-press sintering at 1950°C in Ar/N2 atmosphere under a pressure of 40 MPa for 3 h. The results showed that the thermal conductivity of samples without AlN addition was 53.5 W.m−1.K−1 when sintered in Ar and 50.3 W.m−1.K−1 when sintered in N2. The SiC ceramics with 4 wt% AlN sintered in Ar showed abnormally large grains and exhibited the highest thermal conductivity of 121.7 W.m−1.K−1 among all the samples. The sample with 2 wt% AlN sintered in N2 exhibited a thermal conductivity of 108.6 W.m−1.K−1; the thermal conductivity deceased with the increasing AlN content afterwards. Such a decreasing trend of thermal conductivity was attributed to the ascending 2Hss content and smaller grains of ceramics. There existed an optimal content of AlN and a proper sintering atmosphere for perfecting the microstructure and the thermal conductivity of SiC ceramics. GRAPHICAL ABSTRACT
{"title":"Effects of AlN Content and Sintering Atmospheres on the Thermal Conductivity of Hot-Pressed SiC Ceramics","authors":"Jingren Li, Wen‐Zhong Lu, Hai Jiang","doi":"10.1080/0371750X.2021.1952110","DOIUrl":"https://doi.org/10.1080/0371750X.2021.1952110","url":null,"abstract":"In pursuit of high thermal conductivity of SiC ceramics, this article reports the effects of AlN and sintering atmospheres on the thermal properties and microstructure evolution of SiC ceramics. Dense SiC ceramics with different contents of AlN additive were fabricated through hot-press sintering at 1950°C in Ar/N2 atmosphere under a pressure of 40 MPa for 3 h. The results showed that the thermal conductivity of samples without AlN addition was 53.5 W.m−1.K−1 when sintered in Ar and 50.3 W.m−1.K−1 when sintered in N2. The SiC ceramics with 4 wt% AlN sintered in Ar showed abnormally large grains and exhibited the highest thermal conductivity of 121.7 W.m−1.K−1 among all the samples. The sample with 2 wt% AlN sintered in N2 exhibited a thermal conductivity of 108.6 W.m−1.K−1; the thermal conductivity deceased with the increasing AlN content afterwards. Such a decreasing trend of thermal conductivity was attributed to the ascending 2Hss content and smaller grains of ceramics. There existed an optimal content of AlN and a proper sintering atmosphere for perfecting the microstructure and the thermal conductivity of SiC ceramics. GRAPHICAL ABSTRACT","PeriodicalId":23233,"journal":{"name":"Transactions of the Indian Ceramic Society","volume":"80 1","pages":"193 - 198"},"PeriodicalIF":1.2,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44936352","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 : 2021-07-03DOI: 10.1080/0371750X.2021.1915872
J. Sancho-Gorostiaga, A. Bernardo-Sánchez, J. P. Sancho-Martínez, D. Fernández-González, L. Verdeja
Electrofilter powder (EP) is a residue generated in large amounts during the calcination of aluminium hydroxide in the Bayer process. The production of high temperature structural insulator (HTSI) using EP is proposed. Different tests were made using different proportions of the starting materials, although the optimal mixture contained (in wt%) 52% EP, 14.7% silica fume (or quartz), 12% refractory aluminous cement and 21.3% water. Besides, 900 cm3 of polystyrene flakes were added to the mixture to promote a fine structure of pores. The brick was formed using manual mixing and vibration compacting in silicone molds. Then, it was dried at 100°C for 24 h, and after that, subjected to pre-sintering by heating up to 1050°C, and finally it was sintered at 1400° or 1450°C for 2 h. At the end of the process, the brick comprised 63% mullite, 24% anorthite and 13% corundum, with the following properties: density values within 0.75 and 0.80 g.cm−3, thermal conductivity values within 0.25 and 0.29 W.m−1.K−1, compressive strength values higher than 3.5 MPa, total porosity in the range 75–79% and overheat stability at 1400°C for 24 h with no appreciable dimensional changes. GRAPHICAL ABSTRACT
{"title":"Manufacture of a High Temperature Structural Insulator (HTSI) Using Electrofilter Powders Generated in the Bayer Process","authors":"J. Sancho-Gorostiaga, A. Bernardo-Sánchez, J. P. Sancho-Martínez, D. Fernández-González, L. Verdeja","doi":"10.1080/0371750X.2021.1915872","DOIUrl":"https://doi.org/10.1080/0371750X.2021.1915872","url":null,"abstract":"Electrofilter powder (EP) is a residue generated in large amounts during the calcination of aluminium hydroxide in the Bayer process. The production of high temperature structural insulator (HTSI) using EP is proposed. Different tests were made using different proportions of the starting materials, although the optimal mixture contained (in wt%) 52% EP, 14.7% silica fume (or quartz), 12% refractory aluminous cement and 21.3% water. Besides, 900 cm3 of polystyrene flakes were added to the mixture to promote a fine structure of pores. The brick was formed using manual mixing and vibration compacting in silicone molds. Then, it was dried at 100°C for 24 h, and after that, subjected to pre-sintering by heating up to 1050°C, and finally it was sintered at 1400° or 1450°C for 2 h. At the end of the process, the brick comprised 63% mullite, 24% anorthite and 13% corundum, with the following properties: density values within 0.75 and 0.80 g.cm−3, thermal conductivity values within 0.25 and 0.29 W.m−1.K−1, compressive strength values higher than 3.5 MPa, total porosity in the range 75–79% and overheat stability at 1400°C for 24 h with no appreciable dimensional changes. GRAPHICAL ABSTRACT","PeriodicalId":23233,"journal":{"name":"Transactions of the Indian Ceramic Society","volume":"80 1","pages":"163 - 173"},"PeriodicalIF":1.2,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48938409","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 : 2021-07-03DOI: 10.1080/0371750X.2021.1934122
D. Das, N. Kayal, M. Innocentini
With SiC as starting powder, waste fly ash as sintering additive and metal oxide as catalyst, mullite bonded SiC ceramic membrane was prepared at 1000°C using the conventional solid-state reaction method. Permeability parameters in both air and water flow tests were obtained using laboratory made set-up and the pure water permeability was measured at variable transmembrane pressures. The membrane exhibited excellent pure water flux of 5261 L.m−2.h−1.bar−1 with open porosity of 44.7% and mean pore size of 3.7 μm. With this membrane a high oil removal efficiency of 91% was achieved from the kitchen wastewater having initial oil concentration of 1657 mg.L−1. The method developed here is technologically benign and addressed prevention of environmental pollution by utilizing hazardous waste material for fabrication of porous SiC ceramic membrane at a reduced cost with good mechanical, permeability characteristics and wastewater filtration efficiency. Hence, the proposed method for SiC membranes has good sustainability and is scalable for oily wastewater treatment. GRAPHICAL ABSTRACT
{"title":"Permeability Behavior and Wastewater Filtration Performance of Mullite Bonded Porous SiC Ceramic Membrane Prepared Using Coal Fly Ash as Sintering Additive","authors":"D. Das, N. Kayal, M. Innocentini","doi":"10.1080/0371750X.2021.1934122","DOIUrl":"https://doi.org/10.1080/0371750X.2021.1934122","url":null,"abstract":"With SiC as starting powder, waste fly ash as sintering additive and metal oxide as catalyst, mullite bonded SiC ceramic membrane was prepared at 1000°C using the conventional solid-state reaction method. Permeability parameters in both air and water flow tests were obtained using laboratory made set-up and the pure water permeability was measured at variable transmembrane pressures. The membrane exhibited excellent pure water flux of 5261 L.m−2.h−1.bar−1 with open porosity of 44.7% and mean pore size of 3.7 μm. With this membrane a high oil removal efficiency of 91% was achieved from the kitchen wastewater having initial oil concentration of 1657 mg.L−1. The method developed here is technologically benign and addressed prevention of environmental pollution by utilizing hazardous waste material for fabrication of porous SiC ceramic membrane at a reduced cost with good mechanical, permeability characteristics and wastewater filtration efficiency. Hence, the proposed method for SiC membranes has good sustainability and is scalable for oily wastewater treatment. GRAPHICAL ABSTRACT","PeriodicalId":23233,"journal":{"name":"Transactions of the Indian Ceramic Society","volume":"80 1","pages":"186 - 192"},"PeriodicalIF":1.2,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42799396","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 : 2021-07-03DOI: 10.1080/0371750X.2021.1978864
A. Chakraborty, M. Naskar
Zeolite A-MgO composite was synthesized in presence of zeolite A particles, MgCl2 and urea solution under hydrothermal reaction at 150oC for 5 h followed by calcination at 600°C/2 h. XRD and FTIR results showed the crystallization of MgO along with NaA zeolite crystals. Nano-sheet like MgO particles (50-70 nm) were grown onto the surface of NaA zeolite crystals (1 μm). BET surface area and pore size of the sample were found to be 69 m2.g−1 and 3.9 nm, respectively. XPS analysis showed the binding energies of O1s, Si2p, Na1s, Al2p and Mg2p as 531.6, 102.4, 1072.2, 74.2 and 49.9 eV, respectively. The synthesized product (1 g.L−1 dose) showed 72% adsorption of fluoride (7.24 mg.L−1) within 5 min and reached up to 94% for 90 min at pH 6.8. The adsorption capacity of the sample was calculated as 107.64 mg.g−1 from Langmuir isotherm. The sample could be regenerated up to 5th cycle. A tentative mechanism for the adsorption of fluoride from aqueous solution by the synthesized zeolite A-MgO composite was proposed. GRAPHICAL ABSTRACT
{"title":"Study on the Synthesis and Structural Properties of Zeolite A-MgO Composite for Defluoridation of Water","authors":"A. Chakraborty, M. Naskar","doi":"10.1080/0371750X.2021.1978864","DOIUrl":"https://doi.org/10.1080/0371750X.2021.1978864","url":null,"abstract":"Zeolite A-MgO composite was synthesized in presence of zeolite A particles, MgCl2 and urea solution under hydrothermal reaction at 150oC for 5 h followed by calcination at 600°C/2 h. XRD and FTIR results showed the crystallization of MgO along with NaA zeolite crystals. Nano-sheet like MgO particles (50-70 nm) were grown onto the surface of NaA zeolite crystals (1 μm). BET surface area and pore size of the sample were found to be 69 m2.g−1 and 3.9 nm, respectively. XPS analysis showed the binding energies of O1s, Si2p, Na1s, Al2p and Mg2p as 531.6, 102.4, 1072.2, 74.2 and 49.9 eV, respectively. The synthesized product (1 g.L−1 dose) showed 72% adsorption of fluoride (7.24 mg.L−1) within 5 min and reached up to 94% for 90 min at pH 6.8. The adsorption capacity of the sample was calculated as 107.64 mg.g−1 from Langmuir isotherm. The sample could be regenerated up to 5th cycle. A tentative mechanism for the adsorption of fluoride from aqueous solution by the synthesized zeolite A-MgO composite was proposed. GRAPHICAL ABSTRACT","PeriodicalId":23233,"journal":{"name":"Transactions of the Indian Ceramic Society","volume":"80 1","pages":"199 - 207"},"PeriodicalIF":1.2,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47957013","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 : 2021-07-03DOI: 10.1080/0371750X.2021.1978865
S. Sathish, Narayanaswamy Balaji, Geetha Manivasagam, S. Aruna
Plasma spray grade Al2O3-13TiO2 and ZrO2 powders were blended physically in different proportions (80 wt% Al2O3-13TiO2 + 20 wt% ZrO2, 20 wt% Al2O3-13TiO2 + 80 wt% ZrO2 and 50 wt% Al2O3-13TiO2 + 50 wt% ZrO2) and plasma sprayed on biomedical Ti-13Nb-13Zr alloy using identical plasma spray parameters. Microstructural and phase analyses of the as-sprayed coatings were carried out using scanning electron microscopy and X-ray diffractometry. Results showed that the 80% Al2O3-13TiO2 + 20% ZrO2 coating had enhanced corrosion and wear resistance compared to the other two compositions and appeared to be a propitious coating for biomedical application. GRAPHICAL ABSTRACT
{"title":"Properties of Plasma Sprayed Al2O3-13TiO2 and ZrO2 Blended Coatings on Biomedical Alloy","authors":"S. Sathish, Narayanaswamy Balaji, Geetha Manivasagam, S. Aruna","doi":"10.1080/0371750X.2021.1978865","DOIUrl":"https://doi.org/10.1080/0371750X.2021.1978865","url":null,"abstract":"Plasma spray grade Al2O3-13TiO2 and ZrO2 powders were blended physically in different proportions (80 wt% Al2O3-13TiO2 + 20 wt% ZrO2, 20 wt% Al2O3-13TiO2 + 80 wt% ZrO2 and 50 wt% Al2O3-13TiO2 + 50 wt% ZrO2) and plasma sprayed on biomedical Ti-13Nb-13Zr alloy using identical plasma spray parameters. Microstructural and phase analyses of the as-sprayed coatings were carried out using scanning electron microscopy and X-ray diffractometry. Results showed that the 80% Al2O3-13TiO2 + 20% ZrO2 coating had enhanced corrosion and wear resistance compared to the other two compositions and appeared to be a propitious coating for biomedical application. GRAPHICAL ABSTRACT","PeriodicalId":23233,"journal":{"name":"Transactions of the Indian Ceramic Society","volume":"80 1","pages":"216 - 223"},"PeriodicalIF":1.2,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49385652","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 : 2021-07-03DOI: 10.1080/0371750X.2021.1978866
Yingjie Qiao
A series of Samarium (Sm) doped borosilicate glass was designed and prepared by melt-quenching method to realize the controllable and adjustable red emission for further applications of rare-earth doped glass. The influence of Sm 2O3 and CaF2 concentration on the structure, composition and luminescence property of samples were investigated and revealed. It was shown that the samples had glassy non-crystalline nature and high transparency within the visible light region. The characteristic transitions of Sm3+ ion assigned to 4G5/2 → 6H J /2 (J = 5, 7, 9, 11) were detected, which realized the red-orange emission in the host. Concentration quenching occurred when Sm2O3 and CaF 2 contents were 1.0 and 8 mol%, respectively. Dipole-dipole interactions were the effective mechanisms of energy transfer and quenching between Sm 3+ ions. M eanwhile, with fixed Sm 2O3 concentration, both the PL intensity and the fluorescence lifetime increased as the CaF2 content enhanced. In a word, the orange/red ( O/R) ratio, Commission Internationale de ĺEclairage (CIE) chromatic coordinates and luminescence colour of the samples are dependent and adjustable by the concentration of Sm2O3 and CaF2, which helps to fabricate tunable efficiency light-emitting materials and extend their applications by regulating the composition of glass. GRAPHICAL ABSTRACT
{"title":"Influenceof Sm2O3 and CaF2 Concentrationonthe Enhancement of Luminescence and Red Colour in Borosilicate Glass","authors":"Yingjie Qiao","doi":"10.1080/0371750X.2021.1978866","DOIUrl":"https://doi.org/10.1080/0371750X.2021.1978866","url":null,"abstract":"A series of Samarium (Sm) doped borosilicate glass was designed and prepared by melt-quenching method to realize the controllable and adjustable red emission for further applications of rare-earth doped glass. The influence of Sm 2O3 and CaF2 concentration on the structure, composition and luminescence property of samples were investigated and revealed. It was shown that the samples had glassy non-crystalline nature and high transparency within the visible light region. The characteristic transitions of Sm3+ ion assigned to 4G5/2 → 6H J /2 (J = 5, 7, 9, 11) were detected, which realized the red-orange emission in the host. Concentration quenching occurred when Sm2O3 and CaF 2 contents were 1.0 and 8 mol%, respectively. Dipole-dipole interactions were the effective mechanisms of energy transfer and quenching between Sm 3+ ions. M eanwhile, with fixed Sm 2O3 concentration, both the PL intensity and the fluorescence lifetime increased as the CaF2 content enhanced. In a word, the orange/red ( O/R) ratio, Commission Internationale de ĺEclairage (CIE) chromatic coordinates and luminescence colour of the samples are dependent and adjustable by the concentration of Sm2O3 and CaF2, which helps to fabricate tunable efficiency light-emitting materials and extend their applications by regulating the composition of glass. GRAPHICAL ABSTRACT","PeriodicalId":23233,"journal":{"name":"Transactions of the Indian Ceramic Society","volume":"80 1","pages":"208 - 215"},"PeriodicalIF":1.2,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44991408","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 : 2021-04-03DOI: 10.1080/0371750X.2021.1911685
Sourav Nag, S. Jana, Mrinmoy Adhikary, S. Barik, Alok Roy Chowdhury, Sirshendu Ghorui, B. Haldar, A. Ghosh, H. S. Tripathi, Sitendu Mandal
Radiation shielding window (RSW) glass for nuclear reactor is primarily required for protecting the operating personnel from harmful radioactive rays produced during nuclear energy generation in nuclear hot cells. In this respect, the production of high lead (>70% PbO) containing RSW glass is generally made using platinum pot through bottom pouring flow casting technique. However, owing to low capacity (40 L max.) of high cost platinum pot, the production of glass slab is limited to a maximum dimension of 400×400×100 mm3. Therefore, an alternate cost effective technology is highly required for making higher dimension glass slabs. To fulfill the requirement, low cost and higher volume refractory pot based tilt casting technology can be adopted. In this regard, the refractory pot is to be developed with adequate thermal, chemical and mechanical stabilities towards sustaining high corrosive lead oxide containing molten glass at 1100°-1200°C. For this purpose, a clay based alumino-silicate pot material enriched with mullite has been developed and characterized systematically. The rectangular bars have been fabricated by slip casting technique and the fabricated bars have been fired between 1450° and 1550° C. The fired materials have been characterized in terms of bulk density, apparent porosity, cold and hot modulus of rupture, etc. The RSW glass with more than 70% lead oxide content has successfully been melted in the pot. The quality of RSW glass produced using the pot has also been studied. In an optimized composition of the pot, the formation of higher content of mullite phase having high thermal shock and corrosion resistance with the desired mechanical stability is the key factor behind the stability of the refractory pot for making defect free RSW glass slabs. This cost effective refractory pot technology can substitute the platinum pot technology for producing larger dimension RSW glass slabs. GRAPHICAL ABSTRACT
{"title":"Development of Mullite Based Refractory Pot for High Lead Containing Glass Melting","authors":"Sourav Nag, S. Jana, Mrinmoy Adhikary, S. Barik, Alok Roy Chowdhury, Sirshendu Ghorui, B. Haldar, A. Ghosh, H. S. Tripathi, Sitendu Mandal","doi":"10.1080/0371750X.2021.1911685","DOIUrl":"https://doi.org/10.1080/0371750X.2021.1911685","url":null,"abstract":"Radiation shielding window (RSW) glass for nuclear reactor is primarily required for protecting the operating personnel from harmful radioactive rays produced during nuclear energy generation in nuclear hot cells. In this respect, the production of high lead (>70% PbO) containing RSW glass is generally made using platinum pot through bottom pouring flow casting technique. However, owing to low capacity (40 L max.) of high cost platinum pot, the production of glass slab is limited to a maximum dimension of 400×400×100 mm3. Therefore, an alternate cost effective technology is highly required for making higher dimension glass slabs. To fulfill the requirement, low cost and higher volume refractory pot based tilt casting technology can be adopted. In this regard, the refractory pot is to be developed with adequate thermal, chemical and mechanical stabilities towards sustaining high corrosive lead oxide containing molten glass at 1100°-1200°C. For this purpose, a clay based alumino-silicate pot material enriched with mullite has been developed and characterized systematically. The rectangular bars have been fabricated by slip casting technique and the fabricated bars have been fired between 1450° and 1550° C. The fired materials have been characterized in terms of bulk density, apparent porosity, cold and hot modulus of rupture, etc. The RSW glass with more than 70% lead oxide content has successfully been melted in the pot. The quality of RSW glass produced using the pot has also been studied. In an optimized composition of the pot, the formation of higher content of mullite phase having high thermal shock and corrosion resistance with the desired mechanical stability is the key factor behind the stability of the refractory pot for making defect free RSW glass slabs. This cost effective refractory pot technology can substitute the platinum pot technology for producing larger dimension RSW glass slabs. GRAPHICAL ABSTRACT","PeriodicalId":23233,"journal":{"name":"Transactions of the Indian Ceramic Society","volume":"80 1","pages":"150 - 156"},"PeriodicalIF":1.2,"publicationDate":"2021-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0371750X.2021.1911685","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42907083","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 : 2021-04-03DOI: 10.1080/0371750X.2021.1915874
Anilesh Kumar, Preeti Sharm, J. Pal, Anupinder Singh, R. Kundu, R. Punia
Bi0.9Nd0. 1Fe1–x Co x O3 (x = 0.025, 0.050, 0.075 and 0.1) solid solutions have been synthesized by doping of Co3+ at the Fe3+ site using solid-state reaction method. The prepared solid solutions have been investigated for their structural, magnetic, ferroelectric and magneto-dielectric properties and conduction mechanism. The XRD study reveals that all the solid solutions possess a rhombohedral symmetry. The vibrating sample magnetometer study reveals that all the samples possess magnetic orders and the remnant magnetization has been found to be increased from 0.2388 emu/g for x = 0.025 to 0.7112 emu/g for x = 0.1. The non-Debye type dielectric relaxation has been investigated for all the samples. The frequency dependent ac conductivity data follows Jonscher’s Power law. Variation of exponent n versus temperature follows the overlapping large polaron tunneling conduction model. The maximum value of remanent polarization (∼0.152 μC/cm2) was found for x = 0.1. All the samples exhibit positive magneto-dielectric response in the low-frequency region with the highest magneto-capacitance value of 13.54% at 500 Hz for sample x = 0.1. GRAPHICAL ABSTRACT
{"title":"Investigation on Multiferroic Properties and Conduction Mechanism in Cobalt Doped Bi0.9Nd0.1FeO3 Solid Solutions","authors":"Anilesh Kumar, Preeti Sharm, J. Pal, Anupinder Singh, R. Kundu, R. Punia","doi":"10.1080/0371750X.2021.1915874","DOIUrl":"https://doi.org/10.1080/0371750X.2021.1915874","url":null,"abstract":"Bi0.9Nd0. 1Fe1–x Co x O3 (x = 0.025, 0.050, 0.075 and 0.1) solid solutions have been synthesized by doping of Co3+ at the Fe3+ site using solid-state reaction method. The prepared solid solutions have been investigated for their structural, magnetic, ferroelectric and magneto-dielectric properties and conduction mechanism. The XRD study reveals that all the solid solutions possess a rhombohedral symmetry. The vibrating sample magnetometer study reveals that all the samples possess magnetic orders and the remnant magnetization has been found to be increased from 0.2388 emu/g for x = 0.025 to 0.7112 emu/g for x = 0.1. The non-Debye type dielectric relaxation has been investigated for all the samples. The frequency dependent ac conductivity data follows Jonscher’s Power law. Variation of exponent n versus temperature follows the overlapping large polaron tunneling conduction model. The maximum value of remanent polarization (∼0.152 μC/cm2) was found for x = 0.1. All the samples exhibit positive magneto-dielectric response in the low-frequency region with the highest magneto-capacitance value of 13.54% at 500 Hz for sample x = 0.1. GRAPHICAL ABSTRACT","PeriodicalId":23233,"journal":{"name":"Transactions of the Indian Ceramic Society","volume":"80 1","pages":"142 - 149"},"PeriodicalIF":1.2,"publicationDate":"2021-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0371750X.2021.1915874","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42163112","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 : 2021-04-03DOI: 10.1080/0371750X.2021.1887766
Bo He, Yi Du, Huixiang Xu, Jingchen Ma, Chuanbing Cheng, M. Du
Two different coloured ceramic pigments, blue-green and black, were prepared by using solid phase reaction method from calcined leather waste and industrial grade metal oxides. Chemical compositions of leather waste were characterized by X-ray fluorescence (XRF) in order to determine their chemical compositions, which indicated that the calcined leather waste could be used as a chromium precursor system to prepare ceramic pigments. Crystal structure, microstructure, absorption spectra and colorimetric coordinates of ceramic pigments were characterized by XRD, SEM, UV- vis spectrophotometer and fully automatic colorimeter, respectively. Glaze experiments proved that the as-prepared pigments had good stability and excellent colour development performance. In addition, it was found that the best black colour rendering effect (L*=9.95) occured when the content of calcined leather was 45 wt%, however, the colour rendering performance of blue-green pigments was related to the amount of Al2O3 added. The process scheme is green and environmentally friendly, which is of great significance to resource recycling, sustainable economy and social development. GRAPHICAL ABSTRACT
{"title":"Synthesis of Ceramic Pigments with Chromium Content from Leather Waste","authors":"Bo He, Yi Du, Huixiang Xu, Jingchen Ma, Chuanbing Cheng, M. Du","doi":"10.1080/0371750X.2021.1887766","DOIUrl":"https://doi.org/10.1080/0371750X.2021.1887766","url":null,"abstract":"Two different coloured ceramic pigments, blue-green and black, were prepared by using solid phase reaction method from calcined leather waste and industrial grade metal oxides. Chemical compositions of leather waste were characterized by X-ray fluorescence (XRF) in order to determine their chemical compositions, which indicated that the calcined leather waste could be used as a chromium precursor system to prepare ceramic pigments. Crystal structure, microstructure, absorption spectra and colorimetric coordinates of ceramic pigments were characterized by XRD, SEM, UV- vis spectrophotometer and fully automatic colorimeter, respectively. Glaze experiments proved that the as-prepared pigments had good stability and excellent colour development performance. In addition, it was found that the best black colour rendering effect (L*=9.95) occured when the content of calcined leather was 45 wt%, however, the colour rendering performance of blue-green pigments was related to the amount of Al2O3 added. The process scheme is green and environmentally friendly, which is of great significance to resource recycling, sustainable economy and social development. GRAPHICAL ABSTRACT","PeriodicalId":23233,"journal":{"name":"Transactions of the Indian Ceramic Society","volume":"80 1","pages":"103 - 109"},"PeriodicalIF":1.2,"publicationDate":"2021-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0371750X.2021.1887766","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45137175","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}
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