Pub Date : 2020-07-06DOI: 10.15406/mseij.2020.04.00133
Biju Peter
In this work, Aleppey finger turmeric rhizomes are collected from the Spices Board distribution center Kozhikode, Kerala and are planted in the five selected villages of central Kerala having different climatic conditions. Similar manuaring conditions are employed. After harvesting the collected rhizomes are dried under similar conditions and methods. All samples are extracted using solvents Acetone, Ethyl Acetate and Methanol using Soxhlet extraction. The moisture content of all the samples is determined using Dean-Stark apparatus and are compared. The colour value is determined using UV spectrophotometer. The yield and color values are compared. The total curcumin content and the percentages of Curcumin, Dimethoxy curcumin and Bisdemethoxy curcumin are determined using HPLC (High pressure liquid chromatography) and are compared. Keywords: spectrophotometer, curcumin, physiological, flavor, antimicrobial effect, turmeric fingers, yellow colour
{"title":"Influence of climatic conditions on curcumin content and colour values of turmeric","authors":"Biju Peter","doi":"10.15406/mseij.2020.04.00133","DOIUrl":"https://doi.org/10.15406/mseij.2020.04.00133","url":null,"abstract":"In this work, Aleppey finger turmeric rhizomes are collected from the Spices Board distribution center Kozhikode, Kerala and are planted in the five selected villages of central Kerala having different climatic conditions. Similar manuaring conditions are employed. After harvesting the collected rhizomes are dried under similar conditions and methods. All samples are extracted using solvents Acetone, Ethyl Acetate and Methanol using Soxhlet extraction. The moisture content of all the samples is determined using Dean-Stark apparatus and are compared. The colour value is determined using UV spectrophotometer. The yield and color values are compared. The total curcumin content and the percentages of Curcumin, Dimethoxy curcumin and Bisdemethoxy curcumin are determined using HPLC (High pressure liquid chromatography) and are compared. Keywords: spectrophotometer, curcumin, physiological, flavor, antimicrobial effect, turmeric fingers, yellow colour","PeriodicalId":435904,"journal":{"name":"Material Science & Engineering International Journal","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121846853","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-30DOI: 10.15406/mseij.2020.04.00130
D. Blagoeva, A. Marmier, Patricia Alves Dias, Claudiu C Pavel
Implementation of recent EU policy measures to reduce greenhouse gas emissions in combination with a large adoption of low-carbon technologies is acknowledged to drive an increasing demand for certain materials. Some of these materials are largely produced outside the EU and are flagged as critical in different studies. This paper presents a new and comprehensive methodology to determine the EU resilience to supply of materials used in major low-carbon technologies. It assesses the security of supply across the materials value chain by adopting specific indicators related to upstream and downstream production stages. A case study, i.e. lithium in the context of rechargeable batteries for electric vehicles, demonstrates the applicability of the methodology. While the overall issue of lithium availability for electric vehicle batteries is known, an integrated analysis at EU level based on the latest technological/market developments is however not available. This paper reveals that the EU resilience to the roll-out of EV will decrease by 2030 unless specific mitigation measures are undertaken at EU level. Such measures include recycling of waste Li-ion batteries, increasing the production of raw lithium, processed materials and cells/batteries in the EU as well as diversification of the supply of lithium and/or cells/batteries from third countries. Keywords: raw material, resilience, criticality, lithium, battery, electric vehicle, supply chain
{"title":"A new methodology to assess the EU resilience to materials supply along the value chain: case of lithium for lithium-ion batteries in electric vehicles","authors":"D. Blagoeva, A. Marmier, Patricia Alves Dias, Claudiu C Pavel","doi":"10.15406/mseij.2020.04.00130","DOIUrl":"https://doi.org/10.15406/mseij.2020.04.00130","url":null,"abstract":"Implementation of recent EU policy measures to reduce greenhouse gas emissions in combination with a large adoption of low-carbon technologies is acknowledged to drive an increasing demand for certain materials. Some of these materials are largely produced outside the EU and are flagged as critical in different studies. This paper presents a new and comprehensive methodology to determine the EU resilience to supply of materials used in major low-carbon technologies. It assesses the security of supply across the materials value chain by adopting specific indicators related to upstream and downstream production stages. A case study, i.e. lithium in the context of rechargeable batteries for electric vehicles, demonstrates the applicability of the methodology. While the overall issue of lithium availability for electric vehicle batteries is known, an integrated analysis at EU level based on the latest technological/market developments is however not available. This paper reveals that the EU resilience to the roll-out of EV will decrease by 2030 unless specific mitigation measures are undertaken at EU level. Such measures include recycling of waste Li-ion batteries, increasing the production of raw lithium, processed materials and cells/batteries in the EU as well as diversification of the supply of lithium and/or cells/batteries from third countries. Keywords: raw material, resilience, criticality, lithium, battery, electric vehicle, supply chain","PeriodicalId":435904,"journal":{"name":"Material Science & Engineering International Journal","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116285267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-02-21DOI: 10.15406/mseij.2020.04.00127
Contreras-Moreno Billmary Zuleyma, Rojas VeraJanne, Izaguirre César, M. Lucero, G. Rubén, Celis María Teresa, Santiago Berta
Pimentaracemosavar.racemosa(Myrtaceae) is a Caribbean arboreal plant known as Bay rum, with a special interest for the cosmetics industry, due to its essential oil. In present study, proximate composition and mineral content of Bay rum fruits was analyzed and results compared to the USDA (2012),1 through the nutrient database for Pimentadioicafruits. The results of bromatologic test of Bay rum revealed a high content of crude fiber (39.46%) and ashes (18.58%). Furthermore, minerals such as potassium (K) and zinc (Zn), found in ashes by using ICP-AES, revealed a higher content of these (6.6 and 1.1 times, respectively), comparing to P. dioica. Bay rum fruits might be considered as possible source of Zn and K for human and animal consumption. Additionally, the high crude fiber content might contribute to blood sugar levels regulation and also to reduce developing gastrointestinal diseases such as colon cancer. Keywords: Pimentaracemosa, fruits, proximate analysis, minerals, potassium, zinc
{"title":"Proximate analysis and mineral composition of Pimentaracemosavar. racemosafruits collected from Táchira state, Venezuela","authors":"Contreras-Moreno Billmary Zuleyma, Rojas VeraJanne, Izaguirre César, M. Lucero, G. Rubén, Celis María Teresa, Santiago Berta","doi":"10.15406/mseij.2020.04.00127","DOIUrl":"https://doi.org/10.15406/mseij.2020.04.00127","url":null,"abstract":"Pimentaracemosavar.racemosa(Myrtaceae) is a Caribbean arboreal plant known as Bay rum, with a special interest for the cosmetics industry, due to its essential oil. In present study, proximate composition and mineral content of Bay rum fruits was analyzed and results compared to the USDA (2012),1 through the nutrient database for Pimentadioicafruits. The results of bromatologic test of Bay rum revealed a high content of crude fiber (39.46%) and ashes (18.58%). Furthermore, minerals such as potassium (K) and zinc (Zn), found in ashes by using ICP-AES, revealed a higher content of these (6.6 and 1.1 times, respectively), comparing to P. dioica. Bay rum fruits might be considered as possible source of Zn and K for human and animal consumption. Additionally, the high crude fiber content might contribute to blood sugar levels regulation and also to reduce developing gastrointestinal diseases such as colon cancer. Keywords: Pimentaracemosa, fruits, proximate analysis, minerals, potassium, zinc","PeriodicalId":435904,"journal":{"name":"Material Science & Engineering International Journal","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115253116","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-29DOI: 10.15406/mseij.2020.04.00120
Jinwu Kang, Xiao Ha, G. Nie, H. Long, Tianjiao Wang, Yong-yi Hu
In lost foam casting (LFC), the presence of an expanded polystyrene (EPS) inside the mold leads to new features for the filling of the melt. The burning of the EPS pattern has great effect on its filling. To provide benchmark experiments for the modeling and numerical simulation of the mold filling process for LFC, a vertical plate with a window was selected. The window was designed in variation of sizes and distances to the borders so as to investigate the melt filling of a series of narrow paths in LFC. The designed EPS pattern were made and the corresponding molds were prepared and melt cast iron was poured. The measurement system of liquid metal filling based on modified contact time method (METM) was used. The filling of measured points was illustrated by an array of light-emitting diodes (LED) arranged resembling the shape of the casting, with the lightening of each diode representing the filling time instant of the measurement point. The filling times of all the points were obtained by the image analysis of recorded movie. The filling profiles and filling velocity during filling process were obtained. The filling results provide support for numerical simulation of LFC. Keywords: Lost foam casting (LFC), mold filling, modified contact time method, LED display, plate casting, cast iron
{"title":"A benchmark experiment of the mold filling of a cast iron plate by lost foam casting","authors":"Jinwu Kang, Xiao Ha, G. Nie, H. Long, Tianjiao Wang, Yong-yi Hu","doi":"10.15406/mseij.2020.04.00120","DOIUrl":"https://doi.org/10.15406/mseij.2020.04.00120","url":null,"abstract":"In lost foam casting (LFC), the presence of an expanded polystyrene (EPS) inside the mold leads to new features for the filling of the melt. The burning of the EPS pattern has great effect on its filling. To provide benchmark experiments for the modeling and numerical simulation of the mold filling process for LFC, a vertical plate with a window was selected. The window was designed in variation of sizes and distances to the borders so as to investigate the melt filling of a series of narrow paths in LFC. The designed EPS pattern were made and the corresponding molds were prepared and melt cast iron was poured. The measurement system of liquid metal filling based on modified contact time method (METM) was used. The filling of measured points was illustrated by an array of light-emitting diodes (LED) arranged resembling the shape of the casting, with the lightening of each diode representing the filling time instant of the measurement point. The filling times of all the points were obtained by the image analysis of recorded movie. The filling profiles and filling velocity during filling process were obtained. The filling results provide support for numerical simulation of LFC. Keywords: Lost foam casting (LFC), mold filling, modified contact time method, LED display, plate casting, cast iron","PeriodicalId":435904,"journal":{"name":"Material Science & Engineering International Journal","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132045650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-10DOI: 10.15406/mseij.2020.04.00119
Petelin Al, Novikov Aa, Apykhtina Iv
The simple model of grain and phase boundaries diffusion into polycrystalline solid system with nano- and micro grain dimensions is proposed. There are considered different types of diffusion regimes which are realized by definite correlations between volume and grain boundary diffusion lengths and average grain sizes. The study shows the temperature regimes where the diffusion along triple junctions is the control stage of structural processes in metal materials. Keywords: metal materials, solid polycrystalline, diffusion, nano, polycrystalline
{"title":"Model description of grain boundary diffusion processes in nano- and microcrystalline solid systems","authors":"Petelin Al, Novikov Aa, Apykhtina Iv","doi":"10.15406/mseij.2020.04.00119","DOIUrl":"https://doi.org/10.15406/mseij.2020.04.00119","url":null,"abstract":"The simple model of grain and phase boundaries diffusion into polycrystalline solid system with nano- and micro grain dimensions is proposed. There are considered different types of diffusion regimes which are realized by definite correlations between volume and grain boundary diffusion lengths and average grain sizes. The study shows the temperature regimes where the diffusion along triple junctions is the control stage of structural processes in metal materials. Keywords: metal materials, solid polycrystalline, diffusion, nano, polycrystalline","PeriodicalId":435904,"journal":{"name":"Material Science & Engineering International Journal","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131729089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-06DOI: 10.15406/mseij.2020.04.00118
Elkin Ia, Volkov Va, Stolbov Ks, Kolodkin Da, Chulkina Aa, Beltyukov An
In this paper, we propose a technique for additive manufacturing of bulk materials from electrically conductive powders, based on the method of point wise electro pulse sintering. This method consists of layer-by-layer consolidation of powders, each layer being formed as a result of successive sintering of small portions of powder compressed between the electrode and the substrate, or between the electrode and the previously sintered layer. Using the proposed method, bulk samples were obtained from powders having the different chemical composition (Cu, Ti, mechanically alloyed tin bronze), and particles of various shapes (dendritic, dumbbell, stone-shaped). Using X-ray diffraction, electron microscopy, and micro hardness measurements, the structural phase states, and porosity of the obtained bulk consolidated materials were studied. Sintering of powders using this method is greatly influenced by the heat release along the boundaries of the particles, which in turn depends on the electrical resistivity of the material. The porosity of the sintered samples mainly depends on the type of powder used and decreases with the decreasing size of the powder particles. Keywords: additive manufacturing, electro pulse sintering, metal powders, porous structure
{"title":"Consolidation of Cu- and Ti-based metal powders using layer-by-layer, spot pulsed electric current sintering","authors":"Elkin Ia, Volkov Va, Stolbov Ks, Kolodkin Da, Chulkina Aa, Beltyukov An","doi":"10.15406/mseij.2020.04.00118","DOIUrl":"https://doi.org/10.15406/mseij.2020.04.00118","url":null,"abstract":"In this paper, we propose a technique for additive manufacturing of bulk materials from electrically conductive powders, based on the method of point wise electro pulse sintering. This method consists of layer-by-layer consolidation of powders, each layer being formed as a result of successive sintering of small portions of powder compressed between the electrode and the substrate, or between the electrode and the previously sintered layer. Using the proposed method, bulk samples were obtained from powders having the different chemical composition (Cu, Ti, mechanically alloyed tin bronze), and particles of various shapes (dendritic, dumbbell, stone-shaped). Using X-ray diffraction, electron microscopy, and micro hardness measurements, the structural phase states, and porosity of the obtained bulk consolidated materials were studied. Sintering of powders using this method is greatly influenced by the heat release along the boundaries of the particles, which in turn depends on the electrical resistivity of the material. The porosity of the sintered samples mainly depends on the type of powder used and decreases with the decreasing size of the powder particles. Keywords: additive manufacturing, electro pulse sintering, metal powders, porous structure","PeriodicalId":435904,"journal":{"name":"Material Science & Engineering International Journal","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131541116","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-31DOI: 10.15406/mseij.2019.03.00117
Eluozo Sn, Nwaobakata C
This model predicts the compressive strength of concrete pavement modified with palm oil fuel as partial replacement for cement. The study monitors the strength development of concrete pavement varying with different percentage of [POFA].The study express the output of the modifier from graphical representation, where optimum strength were observed at 5% at curing age between [7, and 28days].The study has observed that the modifier applied as partial replacement of cement experienced decrease in strength as the percentage of [POFA] dosage increase, these condition were observed from the graphical representation such that gradual decrease were experienced between [10-20%].The declined in strength development from variation of water cement ratio were experienced between [0.40-0.50], the influences from variation of these mixed proportion were also monitored, these conditions were reflected on the output results from the designed mix, the developed model were subjected to simulation, these values were compared with pone et al 2018, where the early strength from 2.5-5% 0f [POFA] were also in agreement with partial replacement of silica fume that also experienced early attained strength, between [2.5-5%] variations from concrete pavement porosity were observed from the heterogeneity of the strength at different water cement ratios, including variation of compaction and placement of the materials. Keywords: modeling, palm oil fuel ash, compressive strength, water cement ratios
该模型预测了部分替代水泥的棕榈油改性混凝土路面的抗压强度。研究监测了不同POFA掺量对混凝土路面强度发展的影响。该研究通过图形表示改性剂的输出，其中在养护龄期为[7至28天]的5%时观察到最佳强度。研究发现，作为部分替代水泥的改性剂，随着[POFA]掺量百分比的增加，其强度呈下降趋势，在[10-20%]之间呈逐渐下降趋势。水灰比变化对强度发展的影响在[0.40-0.50]之间，监测了这些配合比变化对强度发展的影响，将这些情况反映在设计配合比的输出结果上，对所建立的模型进行了仿真，并将这些值与pone et al 2018进行了比较。2.5-5%的早期强度[POFA]也与部分替代硅粉的早期强度一致，也经历了早期达到的强度，从不同水灰比的强度异质性中观察到混凝土路面孔隙率的[2.5-5%]变化，包括压实和材料放置的变化。关键词:建模，棕榈油灰，抗压强度，水灰比
{"title":"Modeling and simulation to monitor the integration of palm fuel oil ash on compressive strength of concrete pavement influenced by variation of water cement ratios","authors":"Eluozo Sn, Nwaobakata C","doi":"10.15406/mseij.2019.03.00117","DOIUrl":"https://doi.org/10.15406/mseij.2019.03.00117","url":null,"abstract":"This model predicts the compressive strength of concrete pavement modified with palm oil fuel as partial replacement for cement. The study monitors the strength development of concrete pavement varying with different percentage of [POFA].The study express the output of the modifier from graphical representation, where optimum strength were observed at 5% at curing age between [7, and 28days].The study has observed that the modifier applied as partial replacement of cement experienced decrease in strength as the percentage of [POFA] dosage increase, these condition were observed from the graphical representation such that gradual decrease were experienced between [10-20%].The declined in strength development from variation of water cement ratio were experienced between [0.40-0.50], the influences from variation of these mixed proportion were also monitored, these conditions were reflected on the output results from the designed mix, the developed model were subjected to simulation, these values were compared with pone et al 2018, where the early strength from 2.5-5% 0f [POFA] were also in agreement with partial replacement of silica fume that also experienced early attained strength, between [2.5-5%] variations from concrete pavement porosity were observed from the heterogeneity of the strength at different water cement ratios, including variation of compaction and placement of the materials. Keywords: modeling, palm oil fuel ash, compressive strength, water cement ratios","PeriodicalId":435904,"journal":{"name":"Material Science & Engineering International Journal","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129371633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-12-05DOI: 10.15406/mseij.2018.02.00059
Gunel Huseynova, Vladislav Kostianovskii
Organic semiconductors and electronic devices based on these materials continue attracting great interest due to their excellent and unique optoelectronic properties as well as the advantageous possibilities of realizing flexible, light-weight, low-cost, and transparent optoelectronic devices fabricated on ultra-thin and solution-processible active layers. However, their poor electronic performance and unstable operation under ambient conditions limit their application in consumer electronics. This paper presents a brief introduction to doping of organic semiconductors and organic field-effect transistors. The description of the issues regarding charge carrier transport and other optoelectronic properties of organic semiconductors is also provided. The doping agents and methods commonly applied for organic semiconductors along with their fundamental mechanisms are introduced.
{"title":"Doped organic field-effect transistors","authors":"Gunel Huseynova, Vladislav Kostianovskii","doi":"10.15406/mseij.2018.02.00059","DOIUrl":"https://doi.org/10.15406/mseij.2018.02.00059","url":null,"abstract":"Organic semiconductors and electronic devices based on these materials continue attracting great interest due to their excellent and unique optoelectronic properties as well as the advantageous possibilities of realizing flexible, light-weight, low-cost, and transparent optoelectronic devices fabricated on ultra-thin and solution-processible active layers. However, their poor electronic performance and unstable operation under ambient conditions limit their application in consumer electronics. This paper presents a brief introduction to doping of organic semiconductors and organic field-effect transistors. The description of the issues regarding charge carrier transport and other optoelectronic properties of organic semiconductors is also provided. The doping agents and methods commonly applied for organic semiconductors along with their fundamental mechanisms are introduced.","PeriodicalId":435904,"journal":{"name":"Material Science & Engineering International Journal","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127014073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-11-21DOI: 10.15406/mseij.2018.02.00057
Frechero Ma, Cardillo E, Molina Mc, Sola Me, T. S, D. P
Lithium borate glasses modified with molybdenum oxide according to the formula: xMoO3 (1-x)[0.25 Li2O 0.75 B2O3] prepared by the melt quenching technique were studied. Density, differential thermal analysis, FTIR and impedance spectroscopic were used to analyze these systems. It was confirmed that the glassy matrix of these systems was based on the MoO6 octahedral units and on BO3 and BO4 units. The results explained how the stability of a borate matrix that hosted molybdenum ions was affected by the presence of small mobile ions (lithium ions in the present case). It was found that concentration of molybdenum oxide was restricted by strong interactions between the charged molybdenum structures and the mobile ions due to the presence of order forces that promote the formation of crystalline structures. Keywords: molybdenum, oxide glasses, electrical properties, borate glass stability
{"title":"Effect of small mobile cations on molybdenumborate glasses","authors":"Frechero Ma, Cardillo E, Molina Mc, Sola Me, T. S, D. P","doi":"10.15406/mseij.2018.02.00057","DOIUrl":"https://doi.org/10.15406/mseij.2018.02.00057","url":null,"abstract":"Lithium borate glasses modified with molybdenum oxide according to the formula: xMoO3 (1-x)[0.25 Li2O 0.75 B2O3] prepared by the melt quenching technique were studied. Density, differential thermal analysis, FTIR and impedance spectroscopic were used to analyze these systems. It was confirmed that the glassy matrix of these systems was based on the MoO6 octahedral units and on BO3 and BO4 units. The results explained how the stability of a borate matrix that hosted molybdenum ions was affected by the presence of small mobile ions (lithium ions in the present case). It was found that concentration of molybdenum oxide was restricted by strong interactions between the charged molybdenum structures and the mobile ions due to the presence of order forces that promote the formation of crystalline structures. Keywords: molybdenum, oxide glasses, electrical properties, borate glass stability","PeriodicalId":435904,"journal":{"name":"Material Science & Engineering International Journal","volume":"338 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115267556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-11-16DOI: 10.15406/mseij.2018.02.00054
M. Lomozik
The paper shortly characterises the structure of the separate areas of the heat affected zone which occurs in the structural steels during welding and surfacing. It presents the methodology of thermal cycles measuring while argon shielded TIG surfacing of steel plates SM400A. Surfacing was conducted in two variants, i.e. without preheating and with preheating before surfacing. Research resulted in the developing of diagrams determining the value of the maximum temperature of the thermal cycle in the specific place of the element being surfaced for the given heat input Q as well as diagrams enabling the determination of cooling time of a padding weld, assuming that maximum temperature of the thermal cycle in the selected point of the component being surfaced is known for the determined heat input Q during TIG surfacing with and without preheating. Keywords: welding thermal cycle, TIG process, heat input q, preheating, cooling time
{"title":"Experimental results-based estimation of cooling time during the TIG surfacing of steels performer with and without preheating","authors":"M. Lomozik","doi":"10.15406/mseij.2018.02.00054","DOIUrl":"https://doi.org/10.15406/mseij.2018.02.00054","url":null,"abstract":"The paper shortly characterises the structure of the separate areas of the heat affected zone which occurs in the structural steels during welding and surfacing. It presents the methodology of thermal cycles measuring while argon shielded TIG surfacing of steel plates SM400A. Surfacing was conducted in two variants, i.e. without preheating and with preheating before surfacing. Research resulted in the developing of diagrams determining the value of the maximum temperature of the thermal cycle in the specific place of the element being surfaced for the given heat input Q as well as diagrams enabling the determination of cooling time of a padding weld, assuming that maximum temperature of the thermal cycle in the selected point of the component being surfaced is known for the determined heat input Q during TIG surfacing with and without preheating. Keywords: welding thermal cycle, TIG process, heat input q, preheating, cooling time","PeriodicalId":435904,"journal":{"name":"Material Science & Engineering International Journal","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130338366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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