Pub Date : 2021-11-29DOI: 10.31031/rdms.2021.16.000883
O. Anunziata
Nanostructured materials, based on silica (MCM, SBA [1,2]) and ordered mesoporous carbon (OMC), such as CMK-1, CMK-3 [3] and Multi-Walled Carbon Nanotubes (MWCN) [4], because of their large surface area, pore volume and possibility to vary the pore size, offer a great opportunity for their application in various fields, from industrial processes to biomedical engineering, air and water pollution decontamination and energy reservoirs. Recently, we have developed a technique of preparation of monocrystalline hydroxyapatite (HaP) , and by the same procedure, but in the presence of the respective hosts, forming in situ composites such as HaP/MCM-41 and HaP/SBA15 composites [5]. Numerous approaches for fluoride removal from contaminated water, such as precipitation-coagulation [6], membrane technology [7,8], ion exchange [9] and adsorption [10,11]. Among the above methods, fluoride adsorption on adsorbents is attracting increasing attention due to its advantages of convenient design and operation, and low cost [12]. Different types of adsorbents, such as metal adsorbents [13], carbon adsorbents [14], carbon materials [15], natural materials [16], and biosorbents [17], have been used to remove fluoride from water. MOFs have also been used as new adsorbents for fluoride adsorption due to their surface functional groups and ordered atomic arrangement [18]. Calcium phosphate apatites are compounds of the formula Ca5 (PO4)3X, where X can be an Fion (fluorapatite, FaP), OH(hydroxyapatite, HaP), or a Clion (chlorapatite). The ion is substituted by another ion of the same sign but of different charge. Neutrality is maintained by substitutions of ions with different charges or vacancies [19]. Studied the crystallization of HaP (hydroxyapatite) on polymers containing C-N groups, from supersaturated solutions of HaP has been reported [20]. The growth of hydroxyapatite on silica gels in the presence of organic additives was studied by Rivera-Muñoz et al. [21]. Laghzizil et al. [22] have correlated the results of HaP fluorination with the physicochemical properties of HaP. Recently, morphological modifications of hydroxyapatite using fatty acids as an organic modifier have been reported [23]. The goal of this work is the successful Crimson Publishers Wings to the Research Short Communication
{"title":"HaP/SBA-3 Nanostructured Composite to Remove Fluoride Effectively from Contaminated Water","authors":"O. Anunziata","doi":"10.31031/rdms.2021.16.000883","DOIUrl":"https://doi.org/10.31031/rdms.2021.16.000883","url":null,"abstract":"Nanostructured materials, based on silica (MCM, SBA [1,2]) and ordered mesoporous carbon (OMC), such as CMK-1, CMK-3 [3] and Multi-Walled Carbon Nanotubes (MWCN) [4], because of their large surface area, pore volume and possibility to vary the pore size, offer a great opportunity for their application in various fields, from industrial processes to biomedical engineering, air and water pollution decontamination and energy reservoirs. Recently, we have developed a technique of preparation of monocrystalline hydroxyapatite (HaP) , and by the same procedure, but in the presence of the respective hosts, forming in situ composites such as HaP/MCM-41 and HaP/SBA15 composites [5]. Numerous approaches for fluoride removal from contaminated water, such as precipitation-coagulation [6], membrane technology [7,8], ion exchange [9] and adsorption [10,11]. Among the above methods, fluoride adsorption on adsorbents is attracting increasing attention due to its advantages of convenient design and operation, and low cost [12]. Different types of adsorbents, such as metal adsorbents [13], carbon adsorbents [14], carbon materials [15], natural materials [16], and biosorbents [17], have been used to remove fluoride from water. MOFs have also been used as new adsorbents for fluoride adsorption due to their surface functional groups and ordered atomic arrangement [18]. Calcium phosphate apatites are compounds of the formula Ca5 (PO4)3X, where X can be an Fion (fluorapatite, FaP), OH(hydroxyapatite, HaP), or a Clion (chlorapatite). The ion is substituted by another ion of the same sign but of different charge. Neutrality is maintained by substitutions of ions with different charges or vacancies [19]. Studied the crystallization of HaP (hydroxyapatite) on polymers containing C-N groups, from supersaturated solutions of HaP has been reported [20]. The growth of hydroxyapatite on silica gels in the presence of organic additives was studied by Rivera-Muñoz et al. [21]. Laghzizil et al. [22] have correlated the results of HaP fluorination with the physicochemical properties of HaP. Recently, morphological modifications of hydroxyapatite using fatty acids as an organic modifier have been reported [23]. The goal of this work is the successful Crimson Publishers Wings to the Research Short Communication","PeriodicalId":20943,"journal":{"name":"Research & Development in Material Science","volume":"64 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72808848","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 : 2021-11-22DOI: 10.31031/rdms.2021.16.000882
T. Lamichhane
Bonded permanent magnets need to process magnetic filler particles and binder together which is a form of hybrid or composite manufacturing that needs to simultaneously process multimaterials. Polymer bonding of the permanent magnets decreases the energy product of the bonded magnets which varies with square of loading fraction of magnetic materials. However, due to high viscosity of bonding polymer prohibits loading higher than 80 volume % of magnetic materials in most efficient loading process such as compression molding. To further increase the loading of magnetic fraction in the bonded permanent magnets, it is expected to be beneficial to introduce a fraction of nonreacting thermally sacrificial polymer along with permanent bonding polymer in the least permissible of about 20 volume % of the polymer. This process of first adding the sacrificial polymer for higher processability for composites and later removing it via post processing such as heat treatment provides a simple example of inclusion of both the additive and the subtractive stages of hybrid manufacturing. These hybrid composite magnets can be heat treated to remove the sacrificial polymer to further increase the density and energy product which might require to implement hot isostatic pressing for compaction. Although the identification of such ideal polymer requires an extensive polymer chemistry research, we have compression molded several permanent bonding polymers such as nylon, polycarbonate (PC) and polyphenyl sulfide (PPS) and potential sacrificial polymer such as polyoxymethylene (POM), polystyrene (PS), and Acrylonitrile Butadiene Styrene (ABS) and heat treated to remove the sacrificial polymers. It is discovered that oxygen free low temperature pyrolizable polymers could be the potential candidates for increasing the magnet particles loading for achieving high energy products.
{"title":"Challenges in Postprocessing of Hybrid Manufacturing of Magnet Polymer Composites to Enhance the Energy Product of NdFeB Bonded Magnets","authors":"T. Lamichhane","doi":"10.31031/rdms.2021.16.000882","DOIUrl":"https://doi.org/10.31031/rdms.2021.16.000882","url":null,"abstract":"Bonded permanent magnets need to process magnetic filler particles and binder together which is a form of hybrid or composite manufacturing that needs to simultaneously process multimaterials. Polymer bonding of the permanent magnets decreases the energy product of the bonded magnets which varies with square of loading fraction of magnetic materials. However, due to high viscosity of bonding polymer prohibits loading higher than 80 volume % of magnetic materials in most efficient loading process such as compression molding. To further increase the loading of magnetic fraction in the bonded permanent magnets, it is expected to be beneficial to introduce a fraction of nonreacting thermally sacrificial polymer along with permanent bonding polymer in the least permissible of about 20 volume % of the polymer. This process of first adding the sacrificial polymer for higher processability for composites and later removing it via post processing such as heat treatment provides a simple example of inclusion of both the additive and the subtractive stages of hybrid manufacturing. These hybrid composite magnets can be heat treated to remove the sacrificial polymer to further increase the density and energy product which might require to implement hot isostatic pressing for compaction. Although the identification of such ideal polymer requires an extensive polymer chemistry research, we have compression molded several permanent bonding polymers such as nylon, polycarbonate (PC) and polyphenyl sulfide (PPS) and potential sacrificial polymer such as polyoxymethylene (POM), polystyrene (PS), and Acrylonitrile Butadiene Styrene (ABS) and heat treated to remove the sacrificial polymers. It is discovered that oxygen free low temperature pyrolizable polymers could be the potential candidates for increasing the magnet particles loading for achieving high energy products.","PeriodicalId":20943,"journal":{"name":"Research & Development in Material Science","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83059506","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 : 2021-11-22DOI: 10.31031/rdms.2021.16.000881
S. Munot
During the severe accident condition involving the core melt, stabilization and cooling the molten corium for long duration is the primary requirement. To address this challenge, core catcher systems are being installed inside the containment of the advanced nuclear reactors. Few ex-vessel core catcher designs incorporate special refractory sacrificial material, which on interaction with molten corium, ablate and reduce the enthalpy of the molten pool. During the interaction, the components of ablated sacrificial material and molten corium are stratified in different layers due to density difference between them, i.e., the low density oxidic components stratify in the top layer while higher density metallic components stratify in the bottom layers in the melt pool. This manuscript presents the material characterization of the stratified melt pool after cooling in an experiment involving interaction of approx. 550kg of molten simulant corium with approx. 150kg of sacrificial material in a scaled down V-shaped ex-vessel core catcher vessel. The cooling strategy in the experiment was similar to prototypic reactor conditions. After cooling and stratification of the melt pool, solid samples from different locations and different heights were collected for SEM-EDS analysis for characterizations. The phenomena of melt inversion were verified in the post-test analysis.
{"title":"Experimental Simulation of Molten Corium and Sacrificial Material Interaction in a Scaled Down Core Catcher","authors":"S. Munot","doi":"10.31031/rdms.2021.16.000881","DOIUrl":"https://doi.org/10.31031/rdms.2021.16.000881","url":null,"abstract":"During the severe accident condition involving the core melt, stabilization and cooling the molten corium for long duration is the primary requirement. To address this challenge, core catcher systems are being installed inside the containment of the advanced nuclear reactors. Few ex-vessel core catcher designs incorporate special refractory sacrificial material, which on interaction with molten corium, ablate and reduce the enthalpy of the molten pool. During the interaction, the components of ablated sacrificial material and molten corium are stratified in different layers due to density difference between them, i.e., the low density oxidic components stratify in the top layer while higher density metallic components stratify in the bottom layers in the melt pool. This manuscript presents the material characterization of the stratified melt pool after cooling in an experiment involving interaction of approx. 550kg of molten simulant corium with approx. 150kg of sacrificial material in a scaled down V-shaped ex-vessel core catcher vessel. The cooling strategy in the experiment was similar to prototypic reactor conditions. After cooling and stratification of the melt pool, solid samples from different locations and different heights were collected for SEM-EDS analysis for characterizations. The phenomena of melt inversion were verified in the post-test analysis.","PeriodicalId":20943,"journal":{"name":"Research & Development in Material Science","volume":"21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84575696","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 : 2021-11-16DOI: 10.31031/rdms.2021.16.000879
Jafarli Rufat
Fe-doped ZnS single-phase thin films showing ferromagnetism have been successfully prepared by Chemical Bath deposition (CBD) on GaAs substrates. Field and temperature dependent magnetization curve indicate that the sample with a Curie temperature Tc as high as 270K. The X-ray diffraction and Atomic Force Microscopy (AFM) reveal that the thin films are well crystallized, Fe ions are substituted for Zn ions in the ZnS matrix and no trace of secondary phases or Fe clusters is detected. The experimental results are explained theoretically by spin-polarized density functional calculations within Generalized-Gradient Approximations (GGA), which indicates the observed high Tc could be mainly ascribed to the p-d exchange coupling between Fe ions and host elements.
{"title":"Properties in Fe-Doped ZnS Thin Films","authors":"Jafarli Rufat","doi":"10.31031/rdms.2021.16.000879","DOIUrl":"https://doi.org/10.31031/rdms.2021.16.000879","url":null,"abstract":"Fe-doped ZnS single-phase thin films showing ferromagnetism have been successfully prepared by Chemical Bath deposition (CBD) on GaAs substrates. Field and temperature dependent magnetization curve indicate that the sample with a Curie temperature Tc as high as 270K. The X-ray diffraction and Atomic Force Microscopy (AFM) reveal that the thin films are well crystallized, Fe ions are substituted for Zn ions in the ZnS matrix and no trace of secondary phases or Fe clusters is detected. The experimental results are explained theoretically by spin-polarized density functional calculations within Generalized-Gradient Approximations (GGA), which indicates the observed high Tc could be mainly ascribed to the p-d exchange coupling between Fe ions and host elements.","PeriodicalId":20943,"journal":{"name":"Research & Development in Material Science","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80625901","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 : 2021-11-09DOI: 10.31031/rdms.2021.16.000878
F. Arslan
Today, smart cards which include a small microchip are very widely used in our daily lives. The chief among these is credit cards. In addition, gift shopping card, phone card, sim card, hotel room card involves great proportions. They generally include many precious metals in their body, including noble metals, and semi-noble metals; predominantly gold, silver, copper, etc. The aim of this experimental work is to recover the metals from the smart cards by hydrometallurgical processes namely acidic leaching (HNO 3 and Aqua Regia) followed by precipitation and cementation. Three different types of smart cards; credit cards supplied from different banks, telephone cards produced for Turk Telekom, and sim cards from three different mobile service providers, are used in the experimental work. As a result of this study, almost all copper, silver,
{"title":"Recovery of Metallic Values in Smart Cards","authors":"F. Arslan","doi":"10.31031/rdms.2021.16.000878","DOIUrl":"https://doi.org/10.31031/rdms.2021.16.000878","url":null,"abstract":"Today, smart cards which include a small microchip are very widely used in our daily lives. The chief among these is credit cards. In addition, gift shopping card, phone card, sim card, hotel room card involves great proportions. They generally include many precious metals in their body, including noble metals, and semi-noble metals; predominantly gold, silver, copper, etc. The aim of this experimental work is to recover the metals from the smart cards by hydrometallurgical processes namely acidic leaching (HNO 3 and Aqua Regia) followed by precipitation and cementation. Three different types of smart cards; credit cards supplied from different banks, telephone cards produced for Turk Telekom, and sim cards from three different mobile service providers, are used in the experimental work. As a result of this study, almost all copper, silver,","PeriodicalId":20943,"journal":{"name":"Research & Development in Material Science","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82004784","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 : 2021-10-20DOI: 10.31031/rdms.2021.15.000875
Hui Li
{"title":"Extending the Down Limit of Pore Size of Anodic TiO2 Nanotube Arrays","authors":"Hui Li","doi":"10.31031/rdms.2021.15.000875","DOIUrl":"https://doi.org/10.31031/rdms.2021.15.000875","url":null,"abstract":"","PeriodicalId":20943,"journal":{"name":"Research & Development in Material Science","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83488463","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 : 2021-10-20DOI: 10.31031/rdms.2021.16.000876
M. Sadeghi
This research examined sonocatalytic degradation of Methylene Blue (MB) dye in the presence of MIL-88(Fe)/NaY/MnFe2O4 nanocomposite synthesized using the ultrasound assisted-hydrothermal route. Multiple identification techniques were utilized to investigate the MIL-88(Fe)/NaY/MnFe2O4 nanocomposite sonocatalyst involving FESEM, EDAX, FTIR, XRD and BET. The influences of various parameters like contact time, H2O2 concentration, initial MB concentration and sonocatalyst dosage were precisely studied. About 98.1% of MB dye degradation was achieved under the optimum parameter conditions i.e. at pH of 7, 25mg/L of initial MB concentration, H2O2 concentration of 4mM and 0.5g/L of MIL-88(Fe)/NaY/MnFe2O4 dosage within 60min. The enhancement of sonocatalytic activities can be related to the function of NaY zeolite as trap state for the electron. The scavenger tests outcomes demonstrated that the sono-generated hydroxyl radical (.OH) would play an important role in the MB degradation. Additionally, the MIL-88(Fe)/NaY/MnFe2O4 was quite stable since the efficiency of MB degradation gained in the four run was 93.7%.
{"title":"Effective Sonodegradation of Methylene Blue (MB) Organic Dye by Mil-88(Fe)/NaY/MnFe2O4 Nanocomposite Sonocatalyst in Aqueous Solution","authors":"M. Sadeghi","doi":"10.31031/rdms.2021.16.000876","DOIUrl":"https://doi.org/10.31031/rdms.2021.16.000876","url":null,"abstract":"This research examined sonocatalytic degradation of Methylene Blue (MB) dye in the presence of MIL-88(Fe)/NaY/MnFe2O4 nanocomposite synthesized using the ultrasound assisted-hydrothermal route. Multiple identification techniques were utilized to investigate the MIL-88(Fe)/NaY/MnFe2O4 nanocomposite sonocatalyst involving FESEM, EDAX, FTIR, XRD and BET. The influences of various parameters like contact time, H2O2 concentration, initial MB concentration and sonocatalyst dosage were precisely studied. About 98.1% of MB dye degradation was achieved under the optimum parameter conditions i.e. at pH of 7, 25mg/L of initial MB concentration, H2O2 concentration of 4mM and 0.5g/L of MIL-88(Fe)/NaY/MnFe2O4 dosage within 60min. The enhancement of sonocatalytic activities can be related to the function of NaY zeolite as trap state for the electron. The scavenger tests outcomes demonstrated that the sono-generated hydroxyl radical (.OH) would play an important role in the MB degradation. Additionally, the MIL-88(Fe)/NaY/MnFe2O4 was quite stable since the efficiency of MB degradation gained in the four run was 93.7%.","PeriodicalId":20943,"journal":{"name":"Research & Development in Material Science","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82323020","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 : 2021-10-14DOI: 10.31031/rdms.2021.15.000874
Ash Ahmed
A fundamental issue with the active ingredient of concrete, Portland cement, is its energy-intensive manufacturing process, which has led to the cement industry emitting up to 10% of global CO2 levels. To facilitate the reduction in the embodied CO 2 of concrete, the Portland Cement (PC) content has been entirely replaced volumetrically with Hydrated Lime (HL) and ground granulated blast furnace slag (GGBS or SL). GGBS was used to replace hydrated lime content in 10% increments up to 100% GGBS. Analysis of compressive and flexural strength and density testing was performed on samples to investigate the mechanical and physical properties at 7, 28 and 91-day curing ages, whilst flexural testing was conducted at 91 days curing age. Four standard mix ratios, 1:1:3, 1:2:3, 1:1:2 and 2:1 was made for comparison. Two curing conditions were tested at 91-day curing age, these being air-cured and water curing. Results have shown the optimum mix ratio to be 1:1:2 for all mixes. The optimum mix being HL 1:1:2 SL80%, water cured exceeding 25MPa. Throughout the different ratios, it can be concluded that the optimum replacement of GGBS lies between 80-90%; it can also be noted that 100% GGBS content sees a significant drop in compressive and flexural strength, indicating the presence of hydrated lime to be a catalyst for strength gain.
{"title":"Potential Sustainable Cement Free Limecrete Based on GGBS & Hydrated Lime as an Alternative for Standardised Prescribed Concrete Applications","authors":"Ash Ahmed","doi":"10.31031/rdms.2021.15.000874","DOIUrl":"https://doi.org/10.31031/rdms.2021.15.000874","url":null,"abstract":"A fundamental issue with the active ingredient of concrete, Portland cement, is its energy-intensive manufacturing process, which has led to the cement industry emitting up to 10% of global CO2 levels. To facilitate the reduction in the embodied CO 2 of concrete, the Portland Cement (PC) content has been entirely replaced volumetrically with Hydrated Lime (HL) and ground granulated blast furnace slag (GGBS or SL). GGBS was used to replace hydrated lime content in 10% increments up to 100% GGBS. Analysis of compressive and flexural strength and density testing was performed on samples to investigate the mechanical and physical properties at 7, 28 and 91-day curing ages, whilst flexural testing was conducted at 91 days curing age. Four standard mix ratios, 1:1:3, 1:2:3, 1:1:2 and 2:1 was made for comparison. Two curing conditions were tested at 91-day curing age, these being air-cured and water curing. Results have shown the optimum mix ratio to be 1:1:2 for all mixes. The optimum mix being HL 1:1:2 SL80%, water cured exceeding 25MPa. Throughout the different ratios, it can be concluded that the optimum replacement of GGBS lies between 80-90%; it can also be noted that 100% GGBS content sees a significant drop in compressive and flexural strength, indicating the presence of hydrated lime to be a catalyst for strength gain.","PeriodicalId":20943,"journal":{"name":"Research & Development in Material Science","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76600986","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 : 2021-10-11DOI: 10.31031/rdms.2021.15.000873
D. Ma
In comparison to our conventional knowledge, some new features of freckle appearance have been observed, indicating new aspects of freckle formation in the Single Crystal (SC) turbine blades made of superalloys. The casting shape has more significant influence on the freckle formation than the local thermal condition. On the transverse sections of the components with curved contour, freckles were exclusively found on the outward curving surfaces having positive curvature, because the surface effect zones of the neighboring sides are overlapped, providing more favorable convection condition. In comparison, the surfaces with negative curvature remained freckle free, because the surface effect of the neighboring sides is divergent from each other. In the longitudinal direction, the freckle formation can be promoted by contracting contour and suppressed by expanding one, respectively.
{"title":"Freckle Formation Affected by Geometry Features of Single Crystal Superalloy Castings","authors":"D. Ma","doi":"10.31031/rdms.2021.15.000873","DOIUrl":"https://doi.org/10.31031/rdms.2021.15.000873","url":null,"abstract":"In comparison to our conventional knowledge, some new features of freckle appearance have been observed, indicating new aspects of freckle formation in the Single Crystal (SC) turbine blades made of superalloys. The casting shape has more significant influence on the freckle formation than the local thermal condition. On the transverse sections of the components with curved contour, freckles were exclusively found on the outward curving surfaces having positive curvature, because the surface effect zones of the neighboring sides are overlapped, providing more favorable convection condition. In comparison, the surfaces with negative curvature remained freckle free, because the surface effect of the neighboring sides is divergent from each other. In the longitudinal direction, the freckle formation can be promoted by contracting contour and suppressed by expanding one, respectively.","PeriodicalId":20943,"journal":{"name":"Research & Development in Material Science","volume":"79 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84120742","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 : 2021-09-29DOI: 10.31031/rdms.2021.15.000872
F. Ozturk
Technology, which is one of the most basic needs of humanity, has continued to develop since the industrial revolution with its undeniable reality. Along with new inventions based on the efficient use of energy, automotive and aerospace industries have become the building blocks of technology. The rapidly developing metal industry has brought the serial manufacturing capability to the industry. On the other hand, high-strength light alloy steels developed in the aerospace industry could not show the desired performance in terms of energy, material life, and design flexibility. Aerospace components, also known as structural materials, should have high stiffness, enhanced toughness, and machinability capabilities [1].
{"title":"Thermoplastic Composite Materials for the Aerospace Industry","authors":"F. Ozturk","doi":"10.31031/rdms.2021.15.000872","DOIUrl":"https://doi.org/10.31031/rdms.2021.15.000872","url":null,"abstract":"Technology, which is one of the most basic needs of humanity, has continued to develop since the industrial revolution with its undeniable reality. Along with new inventions based on the efficient use of energy, automotive and aerospace industries have become the building blocks of technology. The rapidly developing metal industry has brought the serial manufacturing capability to the industry. On the other hand, high-strength light alloy steels developed in the aerospace industry could not show the desired performance in terms of energy, material life, and design flexibility. Aerospace components, also known as structural materials, should have high stiffness, enhanced toughness, and machinability capabilities [1].","PeriodicalId":20943,"journal":{"name":"Research & Development in Material Science","volume":"43 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91029044","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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