Slag regulation is crucial for achieving smelting of high-alumina iron ore in blast furnaces. This study investigated the fluidity and structure of CaO-SiO2–10 wt.%MgO-30 wt.%Al2O3 slag by varying the CaO/SiO2 ratio (1.0–2.0). The results revealed that viscosity decreased with increasing CaO/SiO2 ratio, while the free running temperature, defined as the temperature at which the slag can flow freely, initially increased and then decreased, peaking at the range of 1.2–1.6. Interestingly, the free running temperature of slag at basicity 2.0 (1392 °C) was lower than that at basicity 1.0 (1398 °C). Spectroscopic analysis demonstrated that increasing basicity facilitated greater charge compensation of Al3+ ions, resulting in an increased amount of [AlO4] tetrahedra. Moreover, increasing free oxygen promoted the depolymerization of [SiO4] and [AlO4] tetrahedra, reducing bridging oxygen and increasing non-bridging oxygen. Consequently, the slag's overall polymerization degree decreased. Furthermore, MD simulations identified two distinct fracture mechanisms of bridging oxygen within the Si-O-Si structure.
{"title":"Fluidity and structure of aluminate slags for smelting high-alumina iron ores: Effect of CaO/SiO2 mass ratio","authors":"Shuo Zhang , Xiaohua Liu , Yong Hou , Jia Guo , Hanghang Zhou , Xuewei Lv","doi":"10.1016/j.jnoncrysol.2024.123264","DOIUrl":"10.1016/j.jnoncrysol.2024.123264","url":null,"abstract":"<div><div>Slag regulation is crucial for achieving smelting of high-alumina iron ore in blast furnaces. This study investigated the fluidity and structure of CaO-SiO<sub>2</sub>–10 wt.%MgO-30 wt.%Al<sub>2</sub>O<sub>3</sub> slag by varying the CaO/SiO<sub>2</sub> ratio (1.0–2.0). The results revealed that viscosity decreased with increasing CaO/SiO<sub>2</sub> ratio, while the free running temperature, defined as the temperature at which the slag can flow freely, initially increased and then decreased, peaking at the range of 1.2–1.6. Interestingly, the free running temperature of slag at basicity 2.0 (1392 °C) was lower than that at basicity 1.0 (1398 °C). Spectroscopic analysis demonstrated that increasing basicity facilitated greater charge compensation of Al<sup>3+</sup> ions, resulting in an increased amount of [AlO<sub>4</sub>] tetrahedra. Moreover, increasing free oxygen promoted the depolymerization of [SiO<sub>4</sub>] and [AlO<sub>4</sub>] tetrahedra, reducing bridging oxygen and increasing non-bridging oxygen. Consequently, the slag's overall polymerization degree decreased. Furthermore, MD simulations identified two distinct fracture mechanisms of bridging oxygen within the Si-O-Si structure.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"646 ","pages":"Article 123264"},"PeriodicalIF":3.2,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142440990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-10-16DOI: 10.1016/j.jnoncrysol.2024.123263
Zhenbei Pan , Qikun Wang , Hongqian Wang , Liusai Yang , Xianhong Zhu , Shengnan Lin , Yingying Lv , Jie Zheng , Wenjiu Duan , Jianlei Liu
The Dexing copper tailing (DCT), Coal slag (CS) and Red mud (RM) were used to prepare a solid waste-derived glass-ceramics. The result shows that the stable base glass can be formed when DCT/CS/RM mass ration is 35/25/40. Different crystallization temperatures (780∼980 ℃) were implemented on the base glass, and found that the glass-ceramics with Ca(Mg0.5Al0.5)((Si1.5Al0.5)O6) as the main crystal phase can be synthesized, whose bulk density, water absorption, Vickers hardness, bending strength, acid/alkali-resistance are in the range of 2.747∼2.887 g/cm3, 0.010∼0.027 %, 6.65∼8.24 GPa, 33.89∼118.53 MPa, 67.77∼99.97/97.85∼99.98 %, respectively. Especially, the GC880 not only shows the best properties (bulk density: 2.87 g/cm3; water absorption: 0.018 %; Vickers hardness: 6.96 GPa; bending strength: 118.53 MPa; acid/alkali-resistance: 99.34/99.97 %), but also has an solidification effect on heavy metal ions (Cr3+/Mn2+/Fe3+/Cu2+/Ni2+), wherein the leaching concentration reduction rates of Mn2+ and Fe3+ are over 97 %, which has the potential to be applied in decorative glass-ceramics.
{"title":"Crystallization, structure-property evolution, and solidification of heavy metals of glass-ceramics based on copper tailing/coal slag/red mud","authors":"Zhenbei Pan , Qikun Wang , Hongqian Wang , Liusai Yang , Xianhong Zhu , Shengnan Lin , Yingying Lv , Jie Zheng , Wenjiu Duan , Jianlei Liu","doi":"10.1016/j.jnoncrysol.2024.123263","DOIUrl":"10.1016/j.jnoncrysol.2024.123263","url":null,"abstract":"<div><div>The Dexing copper tailing (DCT), Coal slag (CS) and Red mud (RM) were used to prepare a solid waste-derived glass-ceramics. The result shows that the stable base glass can be formed when DCT/CS/RM mass ration is 35/25/40. Different crystallization temperatures (780∼980 ℃) were implemented on the base glass, and found that the glass-ceramics with Ca(Mg<sub>0.5</sub>Al<sub>0.5</sub>)((Si<sub>1.5</sub>Al<sub>0.5</sub>)O<sub>6</sub>) as the main crystal phase can be synthesized, whose bulk density, water absorption, Vickers hardness, bending strength, acid/alkali-resistance are in the range of 2.747∼2.887 g/cm<sup>3</sup>, 0.010∼0.027 %, 6.65∼8.24 GPa, 33.89∼118.53 MPa, 67.77∼99.97/97.85∼99.98 %, respectively. Especially, the GC880 not only shows the best properties (bulk density: 2.87 g/cm<sup>3</sup>; water absorption: 0.018 %; Vickers hardness: 6.96 GPa; bending strength: 118.53 MPa; acid/alkali-resistance: 99.34/99.97 %), but also has an solidification effect on heavy metal ions (Cr<sup>3+</sup>/Mn<sup>2+</sup>/Fe<sup>3+</sup>/Cu<sup>2+</sup>/Ni<sup>2+</sup>), wherein the leaching concentration reduction rates of Mn<sup>2+</sup> and Fe<sup>3+</sup> are over 97 %, which has the potential to be applied in decorative glass-ceramics.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"646 ","pages":"Article 123263"},"PeriodicalIF":3.2,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142440989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-10-16DOI: 10.1016/j.jnoncrysol.2024.123260
Yanyan Song , Shaoxiong Zhou , Zhi Zhang , Ruibiao Zhang , Xiantao Li , Xueyan Jing
FeSiBCuNb nanocrystalline powder was mixed with FeNi at varying weight ratios to fabricate toroidal powder cores through cold pressing. The effect of FeNi powder content on the soft magnetic properties of the powder cores was meticulously investigated, leading to a meaningful discovery. The optimal performance was achieved when the FeNi ratio is 50 wt.%, with a μe of 59.3, a DC-bias performance of 65.6% at a DC magnetic field strength of 100 Oe, and a Pcv of 99.8 kW/m3 at 100 kHz under 50 mT conditions. Compared to the powder cores without FeNi addition, there was a remarkable improvement in μe by 91% and a significant reduction in Pcv by 45.4%. This improvement can be attributed to the role of FeNi as void-filling particles, which effectively enhance the soft magnetic properties of the nanocrystalline FeSiBCuNb powder cores.
{"title":"Improvement for soft magnetic properties of FeSiBCuNb nanocrystalline powder cores by adding FeNi powder","authors":"Yanyan Song , Shaoxiong Zhou , Zhi Zhang , Ruibiao Zhang , Xiantao Li , Xueyan Jing","doi":"10.1016/j.jnoncrysol.2024.123260","DOIUrl":"10.1016/j.jnoncrysol.2024.123260","url":null,"abstract":"<div><div>FeSiBCuNb nanocrystalline powder was mixed with FeNi at varying weight ratios to fabricate toroidal powder cores through cold pressing. The effect of FeNi powder content on the soft magnetic properties of the powder cores was meticulously investigated, leading to a meaningful discovery. The optimal performance was achieved when the FeNi ratio is 50 wt.%, with a <em>μ</em><sub>e</sub> of 59.3, a DC-bias performance of 65.6% at a DC magnetic field strength of 100 Oe, and a <em>P</em><sub>cv</sub> of 99.8 kW/m<sup>3</sup> at 100 kHz under 50 mT conditions. Compared to the powder cores without FeNi addition, there was a remarkable improvement in <em>μ</em><sub>e</sub> by 91% and a significant reduction in <em>P</em><sub>cv</sub> by 45.4%. This improvement can be attributed to the role of FeNi as void-filling particles, which effectively enhance the soft magnetic properties of the nanocrystalline FeSiBCuNb powder cores.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"646 ","pages":"Article 123260"},"PeriodicalIF":3.2,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142440999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-10-16DOI: 10.1016/j.jnoncrysol.2024.123262
Pavel Hrma , Pavel Ferkl , Richard Pokorný , Albert A. Kruger
We analyze the heat transfer between the melt pool and the layer of reacting materials called cold cap, which is the determining factor for the glass production rate in Joule-heated air-bubbled nuclear waste glass melters. We consider the effects of bubbling rate, melt viscosity, melt thermal conductivity, conversion kinetics, and shear rate at the cold-cap bottom, and develop simple relationships for the cold-cap bottom temperature and glass production rate. We show that the melt convection enhances the heat transfer to the cold cap by suppressing the thermal boundary layer and primary foam, while the conversion kinetics opposes these effects. Additionally, we mention how dissolving silica particles affects the primary foam stability and discuss the limitations of the presented approach for vigorously foaming feeds.
{"title":"Effect of cold-cap-bottom shear stress on primary foam stability","authors":"Pavel Hrma , Pavel Ferkl , Richard Pokorný , Albert A. Kruger","doi":"10.1016/j.jnoncrysol.2024.123262","DOIUrl":"10.1016/j.jnoncrysol.2024.123262","url":null,"abstract":"<div><div>We analyze the heat transfer between the melt pool and the layer of reacting materials called cold cap, which is the determining factor for the glass production rate in Joule-heated air-bubbled nuclear waste glass melters. We consider the effects of bubbling rate, melt viscosity, melt thermal conductivity, conversion kinetics, and shear rate at the cold-cap bottom, and develop simple relationships for the cold-cap bottom temperature and glass production rate. We show that the melt convection enhances the heat transfer to the cold cap by suppressing the thermal boundary layer and primary foam, while the conversion kinetics opposes these effects. Additionally, we mention how dissolving silica particles affects the primary foam stability and discuss the limitations of the presented approach for vigorously foaming feeds.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"646 ","pages":"Article 123262"},"PeriodicalIF":3.2,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142441000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The performance of a lithium-ion battery (LIB) is largely contingent upon its anode material. At present, germanium-based anode materials are of interest due to their high theoretical capacity, but there are fewer studies on germanium-based glass anode materials. In this work, graphene mixed germanium-based glass composite material was fabricated utilizing the ball-milling technique. The addition of graphene greatly reduces the charge transfer resistance of the germanium-based glass anode during cycling. Meanwhile, the composite anode exhibited a high specific capacity of 1101.5 mAh g-1 during the first discharge cycle, and the discharge/charge specific capacity was still as high as 1108.2/1098.6 mAh g-1 after 450 cycles at a current density of 500 mA g-1. Moreover, at a high current of 2 A g-1, the composite anode still maintains a high discharge specific capacity of 437.2 mAh g-1, and there is no obvious swelling on the surface, showing excellent stability. It is hoped that the current research endeavor may offer a fresh direction for future studies aimed at optimizing germanium-based glass anode materials.
锂离子电池（LIB）的性能在很大程度上取决于其负极材料。目前，锗基负极材料因其理论容量高而备受关注，但有关锗基玻璃负极材料的研究较少。在这项工作中，利用球磨技术制造了石墨烯混合锗基玻璃复合材料。石墨烯的加入大大降低了锗基玻璃阳极在循环过程中的电荷转移电阻。同时，该复合阳极在第一个放电循环中表现出 1101.5 mAh g-1 的高比容量，在电流密度为 500 mA g-1 的条件下，放电/充电比容量在 450 个循环后仍高达 1108.2/1098.6 mAh g-1。此外，在 2 A g-1 的高电流下，复合阳极仍能保持 437.2 mAh g-1 的高放电比容量，且表面无明显膨胀，显示出极佳的稳定性。希望目前的研究工作能为今后优化锗基玻璃阳极材料的研究提供新的方向。
{"title":"Germanium based glass modified by graphene as anode material with high capacity for lithium-ion batteries","authors":"Siguang Feng, Xinlong Li, Chen Shang, Liangpeng Tang, Junjie Zhang","doi":"10.1016/j.jnoncrysol.2024.123257","DOIUrl":"10.1016/j.jnoncrysol.2024.123257","url":null,"abstract":"<div><div>The performance of a lithium-ion battery (LIB) is largely contingent upon its anode material. At present, germanium-based anode materials are of interest due to their high theoretical capacity, but there are fewer studies on germanium-based glass anode materials. In this work, graphene mixed germanium-based glass composite material was fabricated utilizing the ball-milling technique. The addition of graphene greatly reduces the charge transfer resistance of the germanium-based glass anode during cycling. Meanwhile, the composite anode exhibited a high specific capacity of 1101.5 mAh g<sup>-1</sup> during the first discharge cycle, and the discharge/charge specific capacity was still as high as 1108.2/1098.6 mAh g<sup>-1</sup> after 450 cycles at a current density of 500 mA g<sup>-1</sup>. Moreover, at a high current of 2 A g<sup>-1</sup>, the composite anode still maintains a high discharge specific capacity of 437.2 mAh g<sup>-1</sup>, and there is no obvious swelling on the surface, showing excellent stability. It is hoped that the current research endeavor may offer a fresh direction for future studies aimed at optimizing germanium-based glass anode materials.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"646 ","pages":"Article 123257"},"PeriodicalIF":3.2,"publicationDate":"2024-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142433313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-10-11DOI: 10.1016/j.jnoncrysol.2024.123254
Stefania Wolff , Sharafat Ali , Jakub Karczewski , Małgorzata Rutkowska , Hiroyo Segawa , Natalia Anna Wójcik
A set of fifteen calcium-phosphate-silicate glass samples, varying in alkali, magnesium, silicon, and nitrogen content, was prepared, and their structural, thermal, and in vitro dissolution properties were analyzed. Infrared spectroscopy showed a high degree of depolymerization of the silicate network consisting mainly of Q2 and Q3 units. Thermal analysis showed that the silicon content primarily affects both the glass transition temperature and the thermal stability of the glasses. In vitro dissolution studies were conducted both in static and dynamic modes in phosphate-buffered saline. Greater weight loss was observed for materials tested in the dynamic mode than in the static mode. Ion concentration profiles determined for PBS after immersing the glasses showed the release of sodium and calcium into solutions. Subsequent studies, conducted using scanning electron microscopy, X-ray diffraction, and infrared spectroscopy showed the formation of an amorphous or crystalline layer of calcium phosphates, most likely hydroxyapatite.
{"title":"Modifications of silicate bioglass synthesis and composition for in vitro dissolution control: Static and dynamic assessment","authors":"Stefania Wolff , Sharafat Ali , Jakub Karczewski , Małgorzata Rutkowska , Hiroyo Segawa , Natalia Anna Wójcik","doi":"10.1016/j.jnoncrysol.2024.123254","DOIUrl":"10.1016/j.jnoncrysol.2024.123254","url":null,"abstract":"<div><div>A set of fifteen calcium-phosphate-silicate glass samples, varying in alkali, magnesium, silicon, and nitrogen content, was prepared, and their structural, thermal, and <em>in vitro</em> dissolution properties were analyzed. Infrared spectroscopy showed a high degree of depolymerization of the silicate network consisting mainly of Q<sup>2</sup> and Q<sup>3</sup> units. Thermal analysis showed that the silicon content primarily affects both the glass transition temperature and the thermal stability of the glasses. <em>In vitro</em> dissolution studies were conducted both in static and dynamic modes in phosphate-buffered saline. Greater weight loss was observed for materials tested in the dynamic mode than in the static mode. Ion concentration profiles determined for PBS after immersing the glasses showed the release of sodium and calcium into solutions. Subsequent studies, conducted using scanning electron microscopy, X-ray diffraction, and infrared spectroscopy showed the formation of an amorphous or crystalline layer of calcium phosphates, most likely hydroxyapatite.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"646 ","pages":"Article 123254"},"PeriodicalIF":3.2,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142424661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-10-11DOI: 10.1016/j.jnoncrysol.2024.123253
Renze Xu , Zhen Wang , Haichuan Xu
The effects of Cr2O3 on viscosities and structure evolutions of SiO2-CaO-3wt%MgO-10wt%Fe2O3–10wt%Al2O3-(1–5wt%)Cr2O3 coal slags were investigated in this work. The viscosity of the coal slag decreased with increasing the Cr2O3 content in coal slags. The role of Cr2O3 in present systems was clarified. Cr2O3 was a basic oxide in the coal slags, and Cr3+mainly entered into the slag structures as the form of CrO6 units to occupy the octahedral positions, which could depolymerize the complex structures. With the addition of Cr2O3 into coal slags, the mole ratio of O2- and O- raised while the mole fraction of O0 declined, suggesting Cr2O3 simplified the whole structure of the coal slags and adding Cr2O3 to the present slags could lead to a lower viscosity. The variations of slag viscosities were consistent with the change tendencies of structures analyzed by Raman spectra, 27Al NMR and O1s XPS.
{"title":"Viscosities and structures of SiO2-CaO-3wt%MgO-10wt%Fe2O3-10wt%Al2O3-Cr2O3 coal slags","authors":"Renze Xu , Zhen Wang , Haichuan Xu","doi":"10.1016/j.jnoncrysol.2024.123253","DOIUrl":"10.1016/j.jnoncrysol.2024.123253","url":null,"abstract":"<div><div>The effects of Cr<sub>2</sub>O<sub>3</sub> on viscosities and structure evolutions of SiO<sub>2</sub>-CaO-3wt%MgO-10wt%Fe<sub>2</sub>O<sub>3</sub>–10wt%Al<sub>2</sub>O<sub>3</sub>-(1–5wt%)Cr<sub>2</sub>O<sub>3</sub> coal slags were investigated in this work. The viscosity of the coal slag decreased with increasing the Cr<sub>2</sub>O<sub>3</sub> content in coal slags. The role of Cr<sub>2</sub>O<sub>3</sub> in present systems was clarified. Cr<sub>2</sub>O<sub>3</sub> was a basic oxide in the coal slags, and Cr<sup>3+</sup>mainly entered into the slag structures as the form of CrO<sub>6</sub> units to occupy the octahedral positions, which could depolymerize the complex structures. With the addition of Cr<sub>2</sub>O<sub>3</sub> into coal slags, the mole ratio of O<sup>2-</sup> and O<sup>-</sup> raised while the mole fraction of O<sup>0</sup> declined, suggesting Cr<sub>2</sub>O<sub>3</sub> simplified the whole structure of the coal slags and adding Cr<sub>2</sub>O<sub>3</sub> to the present slags could lead to a lower viscosity. The variations of slag viscosities were consistent with the change tendencies of structures analyzed by Raman spectra, <sup>27</sup>Al NMR and O<sub>1s</sub> XPS.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"646 ","pages":"Article 123253"},"PeriodicalIF":3.2,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142424662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-10-11DOI: 10.1016/j.jnoncrysol.2024.123259
J. Jiang , H.J. Sun , W.H. Zhou , Z.B. Wang , J. Sun , Y. Li
Enthalpy relaxation rejuvenation is a recently developed promising method for modulating mechanical properties of metallic glasses (MGs), but its effect on corrosion resistance, which is important for applications of MGs, has never been studied before. This paper studies its effects on microstructure and corrosion of a Zr52.5Cu17.9Ni14.6Al10Ti5 bulk metallic glasses (BMGs) in 3.5 wt% NaCl solution. The results show that the system energy increases after rejuvenation, but the content of local ordering structure, which results in chemical inhomogeneity, is almost changeless, as compared to the structure-relaxed state. The enthalpy relaxation rejuvenation has minimal effects on passivation and pitting corrosion of structure-relaxed samples, with no apparent adverse effects. Since pitting corrosion of Zr52.5Cu17.9Ni14.6Al10Ti5 BMGs is dominated by pit initiation and chemical inhomogeneity could initiate pitting corrosion, this minimal effect is attributed to the nearly unchanged chemical inhomogeneity of rejuvenated samples. This finding provides valuable information for industrial applications of Zr-based BMGs.
{"title":"Effect of enthalpy relaxation rejuvenation on microstructure and corrosion resistance of a Zr-based bulk metallic glass","authors":"J. Jiang , H.J. Sun , W.H. Zhou , Z.B. Wang , J. Sun , Y. Li","doi":"10.1016/j.jnoncrysol.2024.123259","DOIUrl":"10.1016/j.jnoncrysol.2024.123259","url":null,"abstract":"<div><div>Enthalpy relaxation rejuvenation is a recently developed promising method for modulating mechanical properties of metallic glasses (MGs), but its effect on corrosion resistance, which is important for applications of MGs, has never been studied before. This paper studies its effects on microstructure and corrosion of a Zr<sub>52.5</sub>Cu<sub>17.9</sub>Ni<sub>14.6</sub>Al<sub>10</sub>Ti<sub>5</sub> bulk metallic glasses (BMGs) in 3.5 wt% NaCl solution. The results show that the system energy increases after rejuvenation, but the content of local ordering structure, which results in chemical inhomogeneity, is almost changeless, as compared to the structure-relaxed state. The enthalpy relaxation rejuvenation has minimal effects on passivation and pitting corrosion of structure-relaxed samples, with no apparent adverse effects. Since pitting corrosion of Zr<sub>52.5</sub>Cu<sub>17.9</sub>Ni<sub>14.6</sub>Al<sub>10</sub>Ti<sub>5</sub> BMGs is dominated by pit initiation and chemical inhomogeneity could initiate pitting corrosion, this minimal effect is attributed to the nearly unchanged chemical inhomogeneity of rejuvenated samples. This finding provides valuable information for industrial applications of Zr-based BMGs.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"646 ","pages":"Article 123259"},"PeriodicalIF":3.2,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142424799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
To design ultralight nanocomposite aerogels with good compatibility of different components, excellent thermostability, flame retardancy and strength is an urgent issue to be addressed. In this work, we fabricated a lightweight, compressible aramid nanofiber/silicon dioxide (ANF/SiO2) composite aerogel by sol-gel method. The homogeneous SiO2 knots were formed in-situ among the nanofibers resulting a semi-interpenetrating network structure. Due to the supporting effect of the ANF on the overall skeleton and the inhibiting effect of SiO2 the compression properties of the ANF/SiO2 aerogels were significantly improved. In addition, the aerogel shows low thermal conductivity, excellent thermal stability and flame retardancy meanwhile advanced self-extinguishing properties even after two minutes combustion. The design does not rely on any toxic or corrosive substances and provides a new insight into the preparation of composite aerogels with green, compressibility, thermal insulation and excellent flame retardancy.
{"title":"Semi-interpenetrating networks of ANF/SiO2 composite aerogel with lightweight, compressible, and excellent flame retardancy properties","authors":"Xiaotong Zheng, Fuhai Guo, Yuanyuan Liu, Guangli Hu, Qingfu Wang, Minghan Xu","doi":"10.1016/j.jnoncrysol.2024.123256","DOIUrl":"10.1016/j.jnoncrysol.2024.123256","url":null,"abstract":"<div><div>To design ultralight nanocomposite aerogels with good compatibility of different components, excellent thermostability, flame retardancy and strength is an urgent issue to be addressed. In this work, we fabricated a lightweight, compressible aramid nanofiber/silicon dioxide (ANF/SiO<sub>2</sub>) composite aerogel by sol-gel method. The homogeneous SiO<sub>2</sub> knots were formed in-situ among the nanofibers resulting a semi-interpenetrating network structure. Due to the supporting effect of the ANF on the overall skeleton and the inhibiting effect of SiO<sub>2</sub> the compression properties of the ANF/SiO<sub>2</sub> aerogels were significantly improved. In addition, the aerogel shows low thermal conductivity, excellent thermal stability and flame retardancy meanwhile advanced self-extinguishing properties even after two minutes combustion. The design does not rely on any toxic or corrosive substances and provides a new insight into the preparation of composite aerogels with green, compressibility, thermal insulation and excellent flame retardancy.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"646 ","pages":"Article 123256"},"PeriodicalIF":3.2,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142424659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-10-08DOI: 10.1016/j.jnoncrysol.2024.123238
Yutian Cao , Tianci Ou , Haoxiang Xue , Fan Yang , Chunting Wang , Junhua Li , Qian Zhou , Liang Chen , Kaihong Fang , Peng Lv
We investigated the ion-irradiation effects of iron phosphate glasses (IPGs) with composition of 40Fe2O3‒60P2O5 (mol%) and 10B2O3‒36Fe2O3‒54P2O5 (mol%), respectively, and explored the effect of boron doping on the mechanical properties and the chemical stability. Mono-ion irradiation (5-MeV Xe20+) and sequential irradiation scenario (5-MeV Xe20++ 250-keV H+) were performed with different doses. As the Xe-dose increased, both the hardness and the Young's modulus decreased until converging to saturation, and then the hardness tended to recover. The variations in mechanical properties and water contact angle of the 10B2O3‒36Fe2O3‒54P2O5 were more significant than those of the 40Fe2O3‒60P2O5, indicating inferior irradiation resistance. The hardness recovery was also observed in H-ion irradiation whose energy deposition is predominated by electronic interaction, while the boron doping weakened this phenomenon. Our study contributes to understanding the long-term behavior of IPG during the underground disposal of high-level waste, and provides fundamental data to optimize the design of IPG formulations.
{"title":"Effect of boron doping on the irradiation resistance of iron phosphate glass: Insights from mechanical properties and chemical stability","authors":"Yutian Cao , Tianci Ou , Haoxiang Xue , Fan Yang , Chunting Wang , Junhua Li , Qian Zhou , Liang Chen , Kaihong Fang , Peng Lv","doi":"10.1016/j.jnoncrysol.2024.123238","DOIUrl":"10.1016/j.jnoncrysol.2024.123238","url":null,"abstract":"<div><div>We investigated the ion-irradiation effects of iron phosphate glasses (IPGs) with composition of 40Fe<sub>2</sub>O<sub>3</sub>‒60P<sub>2</sub>O<sub>5</sub> (mol%) and 10B<sub>2</sub>O<sub>3</sub>‒36Fe<sub>2</sub>O<sub>3</sub>‒54P<sub>2</sub>O<sub>5</sub> (mol%), respectively, and explored the effect of boron doping on the mechanical properties and the chemical stability. Mono-ion irradiation (5-MeV Xe<sup>20+</sup>) and sequential irradiation scenario (5-MeV Xe<sup>20+</sup>+ 250-keV H<sup>+</sup>) were performed with different doses. As the Xe-dose increased, both the hardness and the Young's modulus decreased until converging to saturation, and then the hardness tended to recover. The variations in mechanical properties and water contact angle of the 10B<sub>2</sub>O<sub>3</sub>‒36Fe<sub>2</sub>O<sub>3</sub>‒54P<sub>2</sub>O<sub>5</sub> were more significant than those of the 40Fe<sub>2</sub>O<sub>3</sub>‒60P<sub>2</sub>O<sub>5</sub>, indicating inferior irradiation resistance. The hardness recovery was also observed in H-ion irradiation whose energy deposition is predominated by electronic interaction, while the boron doping weakened this phenomenon. Our study contributes to understanding the long-term behavior of IPG during the underground disposal of high-level waste, and provides fundamental data to optimize the design of IPG formulations.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"646 ","pages":"Article 123238"},"PeriodicalIF":3.2,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142424733","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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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