Pub Date : 2022-07-03DOI: 10.1080/21870764.2022.2088755
Sasijuta Wattanarach, S. Supothina, P. Thavorniti
ABSTRACT This work aimed to study the use of sodium perborate as a foaming agent in the production of porous metakaolin-based geopolymer. The influence of sodium perborate foaming agent on physical properties, mechanical properties, and thermal conductivity was focused. The results revealed that the porosity and pore size increased with an increment of the additions of sodium perborate from 0.5 to 2.0 wt.%. The obtained porous geopolymers showed compressive strength of 5–6 MPa and thermal conductivity in the range of 0.22–0.32 W/mK. The addition of sodium perborate produced porous geopolymer with acceptable compressive strength and thermal conductivity.
{"title":"Preparation and properties of metakaolin-based porous geopolymer formed with sodium perborate","authors":"Sasijuta Wattanarach, S. Supothina, P. Thavorniti","doi":"10.1080/21870764.2022.2088755","DOIUrl":"https://doi.org/10.1080/21870764.2022.2088755","url":null,"abstract":"ABSTRACT This work aimed to study the use of sodium perborate as a foaming agent in the production of porous metakaolin-based geopolymer. The influence of sodium perborate foaming agent on physical properties, mechanical properties, and thermal conductivity was focused. The results revealed that the porosity and pore size increased with an increment of the additions of sodium perborate from 0.5 to 2.0 wt.%. The obtained porous geopolymers showed compressive strength of 5–6 MPa and thermal conductivity in the range of 0.22–0.32 W/mK. The addition of sodium perborate produced porous geopolymer with acceptable compressive strength and thermal conductivity.","PeriodicalId":15130,"journal":{"name":"Journal of Asian Ceramic Societies","volume":"10 1","pages":"567 - 574"},"PeriodicalIF":2.3,"publicationDate":"2022-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42753399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-03DOI: 10.1080/21870764.2022.2083476
Anji Lin, Yu Li, Weitao Tang
ABSTRACT Copper slag is a kind of huge metallurgical residue with fayalite as the main phase. Due to the oxidation of fayalite to quartz and hematite during sintering process, quartz became the main phase of ceramics when it contained large proportion of copper slag. The internal stress in the ceramic formed due to the change of α to β increases the potential risk of cracks in the quartz cooling process. In this paper, in order to reduce the precipitation of quartz phase, natural diopside rich in CaO and MgO was introduced into the copper slag-based ceramics. A batch of ceramics were prepared with 50 wt.% copper slag and 5 ~ 25 wt.% diopside as raw materials at different sintering temperatures. Evolution of crystals and densification process for the ceramics were investigated through physical property tests, including XRF, XRD, SEM, EDS and FACTSAGE calculation. The results indicated that fayalite particles derived from the slag formed a core-shell structure during the oxidation process, with the inner core dominated by silica and the outer shell enriched by iron oxide. It was observed that MgO and Fe2O3 reacted outside the shell to form mafic spinel (Fe, Mg) Fe2O4, which greatly promoted the reaction of Ca2+ with SiO2 in the core areas to form anorthite. As the amount of diopside increased, more mafic spinel and anorthite formed, while less quartz appeared. The addition of diopside to the ceramic body did not change its initial sintering temperature at 1170°C but significantly improved its bending strength from 35.8 MPa to 50.3 MPa with 5 ~ 20 wt.% addition of diopside, and more diopside would result in excessive flux and over firing.
{"title":"Evolution of crystals in SiO2-Fe2O3-Al2O3 system ceramics derived from copper slag","authors":"Anji Lin, Yu Li, Weitao Tang","doi":"10.1080/21870764.2022.2083476","DOIUrl":"https://doi.org/10.1080/21870764.2022.2083476","url":null,"abstract":"ABSTRACT Copper slag is a kind of huge metallurgical residue with fayalite as the main phase. Due to the oxidation of fayalite to quartz and hematite during sintering process, quartz became the main phase of ceramics when it contained large proportion of copper slag. The internal stress in the ceramic formed due to the change of α to β increases the potential risk of cracks in the quartz cooling process. In this paper, in order to reduce the precipitation of quartz phase, natural diopside rich in CaO and MgO was introduced into the copper slag-based ceramics. A batch of ceramics were prepared with 50 wt.% copper slag and 5 ~ 25 wt.% diopside as raw materials at different sintering temperatures. Evolution of crystals and densification process for the ceramics were investigated through physical property tests, including XRF, XRD, SEM, EDS and FACTSAGE calculation. The results indicated that fayalite particles derived from the slag formed a core-shell structure during the oxidation process, with the inner core dominated by silica and the outer shell enriched by iron oxide. It was observed that MgO and Fe2O3 reacted outside the shell to form mafic spinel (Fe, Mg) Fe2O4, which greatly promoted the reaction of Ca2+ with SiO2 in the core areas to form anorthite. As the amount of diopside increased, more mafic spinel and anorthite formed, while less quartz appeared. The addition of diopside to the ceramic body did not change its initial sintering temperature at 1170°C but significantly improved its bending strength from 35.8 MPa to 50.3 MPa with 5 ~ 20 wt.% addition of diopside, and more diopside would result in excessive flux and over firing.","PeriodicalId":15130,"journal":{"name":"Journal of Asian Ceramic Societies","volume":"10 1","pages":"545 - 555"},"PeriodicalIF":2.3,"publicationDate":"2022-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48218281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-03DOI: 10.1080/21870764.2022.2094558
V. Loryuenyong, Pitsinee Juikatu, Pichanut Sirisukha, Ukrit Kumleing, A. Buasri
ABSTRACT In this research, we reported the thermochromic and luminescent behaviors of Ca14Zn6Al10-xMnxO35 (x = 0,0.5,1.0,1.5,2) garnet materials prepared by a high-temperature solid-state reaction method. Thermochromism of all samples showed gradual tunability of color with a change in temperature. However, the optimal thermochromic performance was observed for Ca14Zn6Al10-xMnxO35 samples with x = 1 and the sintering temperature of 1200°C. The resultant samples showed a reversible change in color from yellow to reddish yellow when heated to around 500°C. This was due to the changes in absorption bands of Mn4+ and Mn5+ in octahedral and tetrahedral sites, respectively. The materials also exhibited a deep red emission at around 710 nm. The existence of impurity phases was found to degrade the optical properties of the samples.
{"title":"The preparation of luminescent and reversible thermochromic Mn-doped Ca-Zn-Al-O inorganic materials","authors":"V. Loryuenyong, Pitsinee Juikatu, Pichanut Sirisukha, Ukrit Kumleing, A. Buasri","doi":"10.1080/21870764.2022.2094558","DOIUrl":"https://doi.org/10.1080/21870764.2022.2094558","url":null,"abstract":"ABSTRACT In this research, we reported the thermochromic and luminescent behaviors of Ca14Zn6Al10-xMnxO35 (x = 0,0.5,1.0,1.5,2) garnet materials prepared by a high-temperature solid-state reaction method. Thermochromism of all samples showed gradual tunability of color with a change in temperature. However, the optimal thermochromic performance was observed for Ca14Zn6Al10-xMnxO35 samples with x = 1 and the sintering temperature of 1200°C. The resultant samples showed a reversible change in color from yellow to reddish yellow when heated to around 500°C. This was due to the changes in absorption bands of Mn4+ and Mn5+ in octahedral and tetrahedral sites, respectively. The materials also exhibited a deep red emission at around 710 nm. The existence of impurity phases was found to degrade the optical properties of the samples.","PeriodicalId":15130,"journal":{"name":"Journal of Asian Ceramic Societies","volume":"10 1","pages":"597 - 603"},"PeriodicalIF":2.3,"publicationDate":"2022-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44456784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-03DOI: 10.1080/21870764.2022.2099514
Koichi Shigeno, Takumi Nagata, H. Fujimori
ABSTRACT Here, we focused on the firing atmosphere to promote low-temperature sintering and enhance the dielectric properties of low-temperature co-fired alumina (LTCA) containing 5 wt.% of CuO–TiO2–Nb2O5–Ag2O as the sintering aid. Controlling the oxygen partial pressure (pO2) to form Ag–Cu–Ti–Nb–O-based complex oxides and lowering the melting temperature of the sintering aid are necessary to improve the sinterability. Moreover, controlling the pO2 such that AgNbO3 disappears is important to improve the dielectric properties of LTCA. A dense sintered body with approximately 95% relative density was obtained by firing an LTCA sample for 2 h at a firing temperature of 900°C and pO2 of 0.02 atm, and its dielectric properties were measurable. The thermal conductivity of 17 W/mK was better than that of conventional low-temperature co-fired ceramics (2–7 W/mK). These results provide important guidelines for low-temperature sintering and producing LTCA with enhanced dielectric properties.
{"title":"Improving the sintering performance and dielectric properties of thermally conductive low-temperature co-fired alumina by controlling the firing atmosphere","authors":"Koichi Shigeno, Takumi Nagata, H. Fujimori","doi":"10.1080/21870764.2022.2099514","DOIUrl":"https://doi.org/10.1080/21870764.2022.2099514","url":null,"abstract":"ABSTRACT Here, we focused on the firing atmosphere to promote low-temperature sintering and enhance the dielectric properties of low-temperature co-fired alumina (LTCA) containing 5 wt.% of CuO–TiO2–Nb2O5–Ag2O as the sintering aid. Controlling the oxygen partial pressure (pO2) to form Ag–Cu–Ti–Nb–O-based complex oxides and lowering the melting temperature of the sintering aid are necessary to improve the sinterability. Moreover, controlling the pO2 such that AgNbO3 disappears is important to improve the dielectric properties of LTCA. A dense sintered body with approximately 95% relative density was obtained by firing an LTCA sample for 2 h at a firing temperature of 900°C and pO2 of 0.02 atm, and its dielectric properties were measurable. The thermal conductivity of 17 W/mK was better than that of conventional low-temperature co-fired ceramics (2–7 W/mK). These results provide important guidelines for low-temperature sintering and producing LTCA with enhanced dielectric properties.","PeriodicalId":15130,"journal":{"name":"Journal of Asian Ceramic Societies","volume":"10 1","pages":"638 - 648"},"PeriodicalIF":2.3,"publicationDate":"2022-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44841365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-03DOI: 10.1080/21870764.2022.2104712
E. Magnone, Seung Hwan Lee, M. Shin, X. Zhuang, Jae Yeon Hwang, Jeong In Lee, J. Park
ABSTRACT The phase inversion procedure was used to prepare Al2O3 ceramic hollow fiber substrates (AlCHFS) utilizing the dimethyl sulfoxide (DMSO), N,N-dimethylacetamide (DMAC), and 1-methyl-2-pyrrolidone (NMP) aprotic solvents. Different aprotic solvent and non-solvent (water) interactions were used to calibrate different ceramic oxide substrates. AlCHFS with an asymmetrical structure consisting of a finger-like structure on the lumen side and a pore structure on the shell side was obtained using an aprotic solvent/non-solvent pair with a high total Hildebrand solubility (δt). As the aprotic strength was reduced, the finger-like structure on the shell sides became more prominent. Hydrogen permeation studies conducted between 350°C and 450°C reveal that the Pd-coated AlCHFS produced from DMAC aprotic solvent has the maximum hydrogen flux (~0.24 mol m−2 s−1). The activation energy for the thermally activated hydrogen transport process through the Pd-coated AlCHFSs is determined to be around 11.06–14.61 kJ mol−1 in the temperature range of 350°C to 450°C, and it increases linearly with increasing surface porosity of ceramic oxide substrate.
{"title":"Effect of aprotic solvent on characteristics of Al2O3 ceramic hollow fiber substrates prepared by phase inversion for hydrogen permeation applications","authors":"E. Magnone, Seung Hwan Lee, M. Shin, X. Zhuang, Jae Yeon Hwang, Jeong In Lee, J. Park","doi":"10.1080/21870764.2022.2104712","DOIUrl":"https://doi.org/10.1080/21870764.2022.2104712","url":null,"abstract":"ABSTRACT The phase inversion procedure was used to prepare Al2O3 ceramic hollow fiber substrates (AlCHFS) utilizing the dimethyl sulfoxide (DMSO), N,N-dimethylacetamide (DMAC), and 1-methyl-2-pyrrolidone (NMP) aprotic solvents. Different aprotic solvent and non-solvent (water) interactions were used to calibrate different ceramic oxide substrates. AlCHFS with an asymmetrical structure consisting of a finger-like structure on the lumen side and a pore structure on the shell side was obtained using an aprotic solvent/non-solvent pair with a high total Hildebrand solubility (δt). As the aprotic strength was reduced, the finger-like structure on the shell sides became more prominent. Hydrogen permeation studies conducted between 350°C and 450°C reveal that the Pd-coated AlCHFS produced from DMAC aprotic solvent has the maximum hydrogen flux (~0.24 mol m−2 s−1). The activation energy for the thermally activated hydrogen transport process through the Pd-coated AlCHFSs is determined to be around 11.06–14.61 kJ mol−1 in the temperature range of 350°C to 450°C, and it increases linearly with increasing surface porosity of ceramic oxide substrate.","PeriodicalId":15130,"journal":{"name":"Journal of Asian Ceramic Societies","volume":"10 1","pages":"674 - 686"},"PeriodicalIF":2.3,"publicationDate":"2022-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48418017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-03DOI: 10.1080/21870764.2022.2097603
Jong-Chan Lim, Sang‐il Kim, Gyo-Hee Hong, Ji-Hyun Hwang, Heesun Yang, Kyu Hyoung Lee, Hyun-Sik Kim
ABSTRACT Recent electric vehicle multilayer ceramic capacitors (MLCCs) adopt submicron-sized solid-state synthesized BaTiO3 for dielectric layers for high reliability. Unlike BaTiO3 nanoparticles synthesized by the hydrothermal method, particle size distribution control becomes demanding with the solid-state synthesis. Here, BaTiO3 with 260 and 390 nm average particle sizes were synthesized using a solid-state method, and the dielectric properties of the samples sintered at 1100, 1150, and 1200°C were studied in terms of particle size distributions. Notably, BaTiO3 samples sintered with 260 nm particles with smaller grain sizes and lower tetragonality exhibited higher dielectric properties than those prepared with 390 nm particles. The reasons behind the high dielectric performance were found in the lower skewness of the 260 nm particles, which produced a higher density of the sintered sample. For electric vehicle MLCC BaTiO3, engineering their skewness is as important as controlling their grain size or tetragonality for high dielectric performance.
{"title":"Skewness: Important parameter to affect the dielectric properties of BaTiO3","authors":"Jong-Chan Lim, Sang‐il Kim, Gyo-Hee Hong, Ji-Hyun Hwang, Heesun Yang, Kyu Hyoung Lee, Hyun-Sik Kim","doi":"10.1080/21870764.2022.2097603","DOIUrl":"https://doi.org/10.1080/21870764.2022.2097603","url":null,"abstract":"ABSTRACT Recent electric vehicle multilayer ceramic capacitors (MLCCs) adopt submicron-sized solid-state synthesized BaTiO3 for dielectric layers for high reliability. Unlike BaTiO3 nanoparticles synthesized by the hydrothermal method, particle size distribution control becomes demanding with the solid-state synthesis. Here, BaTiO3 with 260 and 390 nm average particle sizes were synthesized using a solid-state method, and the dielectric properties of the samples sintered at 1100, 1150, and 1200°C were studied in terms of particle size distributions. Notably, BaTiO3 samples sintered with 260 nm particles with smaller grain sizes and lower tetragonality exhibited higher dielectric properties than those prepared with 390 nm particles. The reasons behind the high dielectric performance were found in the lower skewness of the 260 nm particles, which produced a higher density of the sintered sample. For electric vehicle MLCC BaTiO3, engineering their skewness is as important as controlling their grain size or tetragonality for high dielectric performance.","PeriodicalId":15130,"journal":{"name":"Journal of Asian Ceramic Societies","volume":"10 1","pages":"613 - 620"},"PeriodicalIF":2.3,"publicationDate":"2022-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47365498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-03DOI: 10.1080/21870764.2022.2088759
Qu Xiaoyan, Liu Jianan, Zhang Meimei, Zhu Chaofeng, Mao Xinlin
ABSTRACT The influence of ferric oxide content on the performance of melt-derived ferrimagnetic glass and glass fibers was investigated in this work. Ferrimagnetic glass fibers within ferrosilicate glass system were prepared by spinning method. The effect of ferric oxide content on the microstructure and mechanical properties of the glass fibers were examined. The X-ray diffraction analysis showed the presence of magnetite with spontaneous crystallization for all investigated samples. Transmission electron microscopy (TEM) analysis indicates that the size of magnetite is less than 30 nm in diameter. The surface microstructure, magnetic hysteresis circles, microwave absorption properties, Mössbauer spectra, thermal expansion performance, tensile properties, hardness, and elastic modulus of as-prepared samples were studied in detail.
{"title":"Influence of ferric oxide content on performance of ferrosilicate glasses and glass fibers","authors":"Qu Xiaoyan, Liu Jianan, Zhang Meimei, Zhu Chaofeng, Mao Xinlin","doi":"10.1080/21870764.2022.2088759","DOIUrl":"https://doi.org/10.1080/21870764.2022.2088759","url":null,"abstract":"ABSTRACT The influence of ferric oxide content on the performance of melt-derived ferrimagnetic glass and glass fibers was investigated in this work. Ferrimagnetic glass fibers within ferrosilicate glass system were prepared by spinning method. The effect of ferric oxide content on the microstructure and mechanical properties of the glass fibers were examined. The X-ray diffraction analysis showed the presence of magnetite with spontaneous crystallization for all investigated samples. Transmission electron microscopy (TEM) analysis indicates that the size of magnetite is less than 30 nm in diameter. The surface microstructure, magnetic hysteresis circles, microwave absorption properties, Mössbauer spectra, thermal expansion performance, tensile properties, hardness, and elastic modulus of as-prepared samples were studied in detail.","PeriodicalId":15130,"journal":{"name":"Journal of Asian Ceramic Societies","volume":"10 1","pages":"556 - 566"},"PeriodicalIF":2.3,"publicationDate":"2022-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44487780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-03DOI: 10.1080/21870764.2022.2101216
Heecheol Shin, Hyobin Choi, Jaeseong Lim, Wan-Chia Lee, K. Mohit, Younsoo Kim, H. Jung, Hanjin Lim, H. Seo
ABSTRACT The continuous scale-down of dynamic random-access memory (DRAM) requires shrinkage of high aspect ratio metal-insulator-metal (MIM) capacitance along with the successful suppression of its leakage current to maintain desired levels of charge storage and retention. As the dimensions of stacked insulating dielectric and metal electrodes in the MIM capacitor are currently <10 nm, interfacial mixing has a large impact on the reliability of the capacitor. This is because defects and secondary interface oxides significantly alter the physicochemical properties of MIM capacitors. The methodology required to characterize ultrathin interfaces in relation to the performance of MIM devices is highly challenging due to its physical and chemical complexities of interface between dielectric and electrode. In this study, a ZrO2-based dielectric film and its interface (with an ultrathin TiO2/Al2O3 buffer layer) are analyzed using angle-resolved X-ray photoelectron spectroscopy (ARXPS), spectroscopic ellipsometry (SE), and temperature dependent I–V analysis for a DRAM MIM capacitor. The composite dielectric layer included either Al2O3 on the bottom or Al2O3/TiO2 between the TiN electrode and ZrO2. This study suggests an effective metrology approach to characterize ultrathin MIM capacitors and the important role of interfacial stabilization using a buffer layer for the effective control of leakage current.
{"title":"Interfacial engineering of ZrO2 metal-insulator-metal capacitor using Al2O3/TiO2 buffer layer for improved leakage properties","authors":"Heecheol Shin, Hyobin Choi, Jaeseong Lim, Wan-Chia Lee, K. Mohit, Younsoo Kim, H. Jung, Hanjin Lim, H. Seo","doi":"10.1080/21870764.2022.2101216","DOIUrl":"https://doi.org/10.1080/21870764.2022.2101216","url":null,"abstract":"ABSTRACT The continuous scale-down of dynamic random-access memory (DRAM) requires shrinkage of high aspect ratio metal-insulator-metal (MIM) capacitance along with the successful suppression of its leakage current to maintain desired levels of charge storage and retention. As the dimensions of stacked insulating dielectric and metal electrodes in the MIM capacitor are currently <10 nm, interfacial mixing has a large impact on the reliability of the capacitor. This is because defects and secondary interface oxides significantly alter the physicochemical properties of MIM capacitors. The methodology required to characterize ultrathin interfaces in relation to the performance of MIM devices is highly challenging due to its physical and chemical complexities of interface between dielectric and electrode. In this study, a ZrO2-based dielectric film and its interface (with an ultrathin TiO2/Al2O3 buffer layer) are analyzed using angle-resolved X-ray photoelectron spectroscopy (ARXPS), spectroscopic ellipsometry (SE), and temperature dependent I–V analysis for a DRAM MIM capacitor. The composite dielectric layer included either Al2O3 on the bottom or Al2O3/TiO2 between the TiN electrode and ZrO2. This study suggests an effective metrology approach to characterize ultrathin MIM capacitors and the important role of interfacial stabilization using a buffer layer for the effective control of leakage current.","PeriodicalId":15130,"journal":{"name":"Journal of Asian Ceramic Societies","volume":"10 1","pages":"649 - 659"},"PeriodicalIF":2.3,"publicationDate":"2022-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49342162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-03DOI: 10.1080/21870764.2022.2096337
Xiu-hua Zhang, Yong Li, Z. Tian, Yang Sun, Chengfei Ma, Q. Zheng
ABSTRACT Alkali attack of aluminosilicate refractories has been a long-term problem in the industry. In this paper, XRD, SEM, and CT scanning methods were used to analyze the phase and structure characteristics of postmortem corundum-mullite refractory used in hot stoves for more than 10 years, and the anti-corrosion mechanism of the refractory was explored. Results show that the corundum-mullite refractory after long-term corrosion by hot stove gas maintains excellent physical properties, and its cold compressive strength can still reach 92.7 MPa. The mullite network formed by the interpenetration of short columnar mullite endows the corundum-mullite refractory with excellent resistance to gas corrosion: Under the working conditions of the hot stoves, mullite network plays a role in dispersing impurities in refractory, so that the CaO entrained in hot stove gas can be transformed into high melting point CAS2 instead of low melting point phase with high Ca content in the working layer of refractory; CAS2 has good resistance to alkaline gases such as K2O(g) and Na2O(g), and the blocking of pores in the working layer of refractory by CAS2 finally makes the refractory free from the corrosion of hot stove gas.
{"title":"Corrosion resistance mechanism of postmortem corundum-mullite refractories used in hot stoves","authors":"Xiu-hua Zhang, Yong Li, Z. Tian, Yang Sun, Chengfei Ma, Q. Zheng","doi":"10.1080/21870764.2022.2096337","DOIUrl":"https://doi.org/10.1080/21870764.2022.2096337","url":null,"abstract":"ABSTRACT Alkali attack of aluminosilicate refractories has been a long-term problem in the industry. In this paper, XRD, SEM, and CT scanning methods were used to analyze the phase and structure characteristics of postmortem corundum-mullite refractory used in hot stoves for more than 10 years, and the anti-corrosion mechanism of the refractory was explored. Results show that the corundum-mullite refractory after long-term corrosion by hot stove gas maintains excellent physical properties, and its cold compressive strength can still reach 92.7 MPa. The mullite network formed by the interpenetration of short columnar mullite endows the corundum-mullite refractory with excellent resistance to gas corrosion: Under the working conditions of the hot stoves, mullite network plays a role in dispersing impurities in refractory, so that the CaO entrained in hot stove gas can be transformed into high melting point CAS2 instead of low melting point phase with high Ca content in the working layer of refractory; CAS2 has good resistance to alkaline gases such as K2O(g) and Na2O(g), and the blocking of pores in the working layer of refractory by CAS2 finally makes the refractory free from the corrosion of hot stove gas.","PeriodicalId":15130,"journal":{"name":"Journal of Asian Ceramic Societies","volume":"10 1","pages":"604 - 612"},"PeriodicalIF":2.3,"publicationDate":"2022-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44209443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-03DOI: 10.1080/21870764.2022.2099102
Petra Cincibusová, Marcela Jebavá, Vladislava Tonarová, L. Němec
ABSTRACT The glass melting process was mathematically modeled in the designed space to establish the controlled melt flow and study its effect on the process character and melting performance. The conversion region of the space with combined heating was intended for batch conversion, and the homogenization region heated by the longitudinal energy barrier guaranteed bubble removal and sand dissolution. The theoretical background was formulated to define the melt flow conditions in a space with batch blanket. High batch conversion rates were acquired under conditions of structured heating, and the values increased almost linearly with the growing fraction of combustion heat delivered in the space conversion region. The increased fraction of total heat in the conversion region and cooling effect of the flue gases adjusted the effective helical flow in the space homogenization region, increased the space utilization and, consequently, the melting performance. The effects of energy distribution and position of the batch borderline on the sand dissolution and bubble removal kinetics were clarified, and the competence of modeling results for advanced melting was discussed.
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