CERAMICS INTERNATIONAL
·
2013
·
IF 1.789
Mingye Ding,Chunhua Lu,Qiaoqiao Cui,Yaru Ni,Zhongzi Xu
Glasses within the B 2 O 3 –Al 2 O 3 –Na 2 O system were examined as potential replacements for PbO-based glass frits with low firing temperature (500–600 °C) for transparent dielectric layer of plasma display panel (PDP). The glasses were evaluated for glass transition ( T g ), softening temperature ( T f ), thermal coefficient of expansion ( α ) and dielectric constant ( ε ). The dielectric constant of these glasses was also compared with theoretical data calculated by Appen and Bresker's equation. T g of the glasses varied between 330 and 460 °C and T f was in the region of 350–500 °C. The thermal coefficient of expansion ranged from 7×10 −6 to 10×10 −6 K −1 . The dielectric constant of these glasses was 6–8 within the region of the theoretical value. The T g , T f , α , ε of the selected glass, which was used to prepare transparent dielectric layer in 20 μm thickness, were found to be 449 °C, 476 °C, 8.284×10 −6 /k, 6.84, respectively. All the results suggest that B 2 O 3 –Al 2 O 3 –Na 2 O glasses would be suitable as a potential candidate for Pb-free dielectric layer in PDPs.
研究领域:
材料科学
·
电子工程
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DOI
高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2026
·
IF 2.6
Lv Fanfan,Wang Wei,Wei Chunyan,Sun Zhuang,Gao Yuan,Wang Kuaishe
Glass lubricants are widely used in titanium alloy extrusion forming due to their excellent high-temperature stability. In this paper, twenty phosphate glass compositions with varying Na 2 O: CaO: P 2 O 5 ratios were designed. Through a series of experiments and analyses, the phosphate glass lubricant suitable for low-temperature titanium alloy extrusion was identified. When the Na 2 O: CaO: P 2 O 5 ratio in the glass lubricant was 3:2:5, the material exhibited the melting temperature of 850 °C and the glass transition temperature below 450 °C. Using methylcellulose (a readily vaporizable binder), the glass lubricant coating was prepared via the slurry method and sprayed at 130 °C. High-temperature tribological tests demonstrated outstanding anti-friction and wear-resistant properties at 750 and 800 °C, with average coefficients of friction of 0.2127 and 0.2112, respectively, and wear rates of 7.85 × 10 −5 mm 3 /N·m and 7.55 × 10 −5 mm 3 /N·m. The lubrication mechanism is attributed to the intrusion of Al 3+ and Ti 4+ ions from the oxide scale on the substrate surface into the phosphate glass. These ions react with the molten liquid, forming the reaction layer of NaAlP 2 O 7 and NaTi 2 (PO 4 ) 3 with three-dimensional open framework. The reaction layer interacts with the molten liquid to form the lubricating film with good elasticity, high density, and uniformity. Furthermore, the ion intrusion shortens the glass chain length, thereby enhancing the anti-friction and anti-wear properties of the glass lubrication coating.
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高影响因子
Journal of Materials Research and Technology-JMR&T
·
2024
·
IF 6.2
Ruijing Sun,Jinhu Wu,Hui Wang,Wei Zhang,Chao Liu,Shaopeng Gu,Weihong Xing,Liang Yu
The reaction behavior between the carbon and mold fluxes during the heating process is vital for a successful continuous casting process and the high billet quality. A detailed investigation combined with thermogravimetry-mass spectrometry (TG-MS), differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, and transmission electron microscopy (TEM) techniques was carried out to systematically investigate the transformation mechanistic of the macro physicochemical properties, melting behavior, viscosity, crystallization, and heat transfer performance caused by the reaction behavior. The results showed that the mold flux underwent carbonate decomposition (973–1223 K), solid reaction (1273–1573 K), and melting process (1473–1673 K) during the continuous casting process. The carbon-bearing mold flux exhibited an endothermic peak at approximately 1673 K, corresponding to a weight loss ratio of approximately 14.5% on the TG curve, confirming that carbon could react with the middle mineral phases Ca 2 SiO 4 , Ca 2 Al 2 SiO 7, and Na 6 Ca 3 Si 6 O 18 to form SiC, increasing the breaking temperature by approximately 293 K. SEM and TEM results indicated that the melting behavior was restrained by the carbon itself and the newly formed components. Besides, the addition of carbon increased the degree of polymerization of molten slag, the thickness of slag film and the proportion of small crystals in slag film, further leading to an increase in crystallization and heat transfer performances. The reaction mechanism between carbon and slag and the subsequent effects on melting point, viscosity, crystallization ratio and heat flux density were clearly understood, which is meaningful for the carbon blending process of the mold flux.
研究领域:
材料科学
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冶金工程
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Lingjun Zhou,Wenyan Zheng,Muzhi Cai,Feifei Huang,Ying Tian,Shilong Zhao,Liaolin Zhang,Junjie Zhang
The TeO 2 -ZnO-Na 2 O glass system demonstrates significant promise for mid-infrared laser applications due to its high refractive index and low phonon energy, although it is inherently limited by poor thermal stability. Traditional methods aimed at enhancing thermal stability, such as the incorporation of intermediates, typically result in compromised optical performance. However, this study introduces a synergistic optimization strategy through strategic Ta 2 O 5 doping. A systematic analysis utilizing Differential Scanning Calorimetry (DSC), Raman spectroscopy, X-ray Photoelectron Spectroscopy (XPS), and photoluminescence (PL) spectroscopy has uncovered a novel correlation between optical performance and average rather than maximum phonon energy. This discovery provides a refined theoretical framework for the design of tellurite glasses. The optimized Tm 3 -doped TZNT4 glass, with a glass transition temperature ( T g ) of 388 °C and a thermal stability range ( ΔT ) of 137 °C, demonstrates excellent absorption (9.1 ×10 −21 cm 2 ) and emission cross-sections (7.1 ×10 −21 cm 2 ) at 2 μm. This work establishes a structure-property-performance paradigm for tellurite glasses, effectively addressing the critical trade-off between thermal robustness and mid-infrared emission performance through rational composition engineering.
研究领域:
材料科学
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光学
·
固体物理
·
红外技术
·
玻璃工程
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 28
·期 17
·13201-13208
·
IF 2.019
Zhang Yijun,Zhang Junwen,Jin Yu,Zhang Jiaqi,Hu Guangcai,Lin Sai,Yuan Rongrong,Liang Xiaojuan,Xiang Weidong
The spherical shape copper oxide (CuO) quantum dots (QDs) were successfully fabricated via copper basic calcium sodium borosilicate (Na 2 O–CaO–B 2 O 3 –SiO 2 ) precursor obtained with a facile sol–gel technique. The microstructural analysis of doped QDs are systemically characterized, such as transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) and X-ray photo-electron spectroscopy. And the results reveal that the CuO QDs with the small size are well dispersed doped in sodium calcium borosilicate glass. Remarkably, the CuO glass materials exhibit the good third-order optical nonlinear susceptibility χ (3) (1.379 × 10 −12 esu), which was investigated by femto-second Z-scan technique at the wavelength of 1550 nm, pulse duration of 50 fs, repetition rate of 50 MHz. The glass hybrids displayed a reverse saturable absorption and self-focusing refraction performance. And the mechanism to explain the third-order nonlinearity of CuO glass may be predominantly originated from the surface plasmon resonance effect, the quantum confinement effect and partly from the thermal effect. Besides, it is interesting that the glass hybrids have significant nonlinear absorption effects that endow the material to the potential value of the application of optical limiting device.
研究领域:
材料科学
·
光学
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 22
·26655-26665
·
IF 2.478
Yang Chengyu,Li Junkai,Lu Yang,Shan Yiting,Xian Qianqian,Zhou Hongqing
CaO-B 2 O 3 -SiO 2 (CBS) glass ceramic with various glass network modifiers were synthesized to develop a kind of material sintered at low temperature for multi-layer ceramic substrates. The influence of double alkali metal oxides (Na 2 O and K 2 O) on sintering characteristics, microstructures and dielectric properties of CBS glass ceramic were investigated. XRD analysis showed that the major crystalline phase was β-CaSiO 3 and CaB 2 O 4 , and the strength of the peak increased with the addition of network modifiers. DSC curve revealed that the process of crystallization and softening were obviously affected. SEM photographs exhibited that the microstructures were composed of amorphous phases, pores and crystalline phases. FTIR showed that the additives changed the continuity of CBS glass structure. An appropriate amount of Na 2 O and K 2 O additives could significantly improve the sintering characteristics and dielectric properties. CBS samples with 1.5 wt% (Na 2 O + K 2 O) sintered at 850 °C for 15 min presented the best performances with the bulk density of 2.53 g/cm 3 , ε r = 5.94 and tan δ = 1.22 × 10 −3 at 10 GHz.
研究领域:
材料科学
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陶瓷学
·
电子学
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高影响因子
Journal of Building Engineering
·
2024
·
IF 6.7
Jiaqi Zhu,Chang Chen,Xufu Wang,Shaowu Jiu,Yanxin Chen,Yan Liu
Rock wool, as an external wall insulation material, is crucial in improving the energy efficiency of structures. However, a large amount of rock wool furnace slag (RWFS) generated during the production of rock wool panels manufacturing causes environmental problems. To address these issues, this study focuses on the use of waste RWFS as a precursor in alkali-activated cementitious materials. In addition, the effect of anatase nano-TiO 2 (ANT) and rutile nano-TiO 2 (RNT) as an additive to the alkali-activated rock wool furnace slag cementitious materials (AARWFSCMs) was evaluated and quantified. Scanning Electronic Microscope (SEM), Isothermal Conduction Calorimetry (ICC), Fourier-Transform Infrared Spectroscopy (FT-IR), X-ray diffraction (XRD) analysis were used to identify the effects of modulus 1.0–1.8 water glass modulus (Ms; SiO 2 /Na 2 O), 3%–7% Na 2 O content on AARWFSCMs. Experimental tests was conducted to quantify the properties such as the setting time, the fluidity, the compressive strength of AARWFSCMs after hardening. Results found that the optimal content of Ms, Na 2 O content in preparing AARWFSCM were 1.4, 5 % for obtaining 28-d compressive strength of 96.36 MPa. The atomic percentage of Ca/Si of the hydration products in the AARWFSCMs fluctuated within 0.94–1.50. The hydration products were a mixture of C–S–H and C–A–S–H. Moreover, the experimental results illustrated that the nano-TiO 2 , which highly beneficial in improving the compressive strength of AARWFSCMs. The additions of 0.50 % ANT and 0.75 % RNT resulted in increments of 5.9 % and 12.8 % in the 28-d compressive strength of AARWFSCMs, respectively. The obtained results provide a new method of utilization of RWFS and improving the sustainability of the construction industry.
研究领域:
建筑材料学
·
环境科学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Dongsheng Jiang,Yuzhe Li,Chao Zhang,Ruifang Wang,Jinpeng Zhu,Wen Chen,Yusi Che,Jilin He
Bayan Obo tailings are rich in niobium and other valuable elements; however, the phase evolution of niobium-bearing slag within these tailings remains poorly understood. This knowledge gap significantly impedes comprehensive utilization of these strategic resources. In this study, a CaO-SiO 2 -Nb 2 O 5 -5%Na 2 O-5%Al 2 O 3 -3%CaF 2 slag system was investigated to examine the phase equilibrium types, compositional characteristics, and distributional evolution under varying w (CaO)/ w (SiO 2 ) ratios and w (Nb 2 O 5 ) contents, using high-temperature equilibrium experiments. Following a 24-hour high-temperature equilibrium treatment at 1473 K under an argon atmosphere, a range of compounds including 13CaO·8SiO 2 ·Nb 2 O 5 ·CaF 2 , 2CaO·4SiO 2 ·Na 2 O·Al 2 O 3 , CaO·Nb 2 O 5 ·NaF, 2CaO·Nb 2 O 5 , and CaO·SiO 2 were identified. An increase in Nb 2 O 5 content coupled with a reduction in the w (CaO)/ w (SiO 2 ) ratio favored the formation of CaO·Nb 2 O 5 ·NaF (pyrochlore phase) and 2CaO·Nb 2 O 5 . These two phases exhibited high Nb concentrations, with the CaO·Nb 2 O 5 ·NaF (pyrochlore) phase containing up to approximately 70% Nb. The optimal smelting conditions for niobium enrichment in the pyrochlore phase were identified within the range of w (CaO)/ w (SiO 2 ) = 0.74∼0.80 and w (Nb 2 O 5 ) = 13.61%∼16.11%.
研究领域:
冶金学
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材料科学
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矿物加工
·
物理化学
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高影响因子
JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Xiangyang Song,Kexuan Han,Dechun Zhou,Pengfei Xu,Xiaomeng Xue,Peng Zhang
Tm 3+ doped Bi 2 O 3 -GeO 2 -Na 2 O glass samples were synthesized by conventional melt-quenching method. The Raman spectra measurements showed the maximum phonon energy of prepared glass is 794 cm −1 , which is considerably lower than silicate glasses . Based on the measured absorption spectra , Judd-Ofelt intensity parameters, spontaneous radiative transition probabilities and radiative lifetimes were calculated to elucidate the radiative properties of Tm 3+ in the presented glass. Intense near infrared emission around ~2 μm was obtained under the pump of 808 nm laser diode . A large stimulated emission cross section (5.51 × 10 −21 cm 2 at 1851 nm) of Tm 3+ : 3 F 4 → 3 H 6 was achieved in the prepared bismuth germanate glass doped with 1 mol% Tm 2 O 3 . Besides, the energy transfer processes among Tm 3+ were analyzed using the extended overlap integral method. These results indicate that the presented glass is a promising candidate for ~2 μm laser applications.
研究领域:
光子学
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材料科学
·
激光材料
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光谱学
·
稀土掺杂玻璃
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DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2025
·Vol. 54
·期 6
·4882-4890
·
IF 2.5
Fu Yingtao,Chen Zhaoyang,Sun Yifan,Liu Yi,Fan Yanwei,Wang Junhua,Chen Huiming
In order to develop glass-ceramic materials capable of emitting neutral white light and to address the limitations of single rare earth element ion-doped luminescent materials, a glass-ceramic material containing Dy 3+ /Eu 3+ -co-doped NaCaPO 4 nanocrystals was successfully synthesized using the melt-quenching and two-step crystallization methods. The prepared glass-ceramic materials were characterized by X-ray diffraction, transmission electron microscopy, and photoluminescence spectroscopy. The energy transfer process between Dy 3+ and Eu 3+ ions was confirmed through excitation spectra, emission spectra, and luminescence decay curves. The emission coordinates and correlated color temperatures of samples with different doping concentrations were calculated using the standard CIE 1931 colorimetric system. The results showed that coordinated emission was achieved in the glass-ceramic containing NaCaPO 4 nanocrystals under excitation at 363 nm. Furthermore, by adjusting the concentration ratio of Dy 3+ and Eu 3+ ions, the color temperature of the white light emission could be tuned from 9910 K to 5349 K, enabling modification of the emission color from the cool-white region to the pure-white region, with chromaticity coordinates reaching (0.3350, 0.3040). Additionally, the material exhibited high thermal stability, with an activation energy of 0.18649 eV. It is expected that the Dy 3+ /Eu 3+ -co-doped NaCaPO 4 glass-ceramic studied here has broad prospects for applications in white light-emitting diodes.
研究领域:
材料科学
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光子学
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光学材料
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稀土掺杂
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固态照明
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Wen-Bo Li,Li-Xia Pang,Xiao-Long Wang,Wei-Guo Liu,Xiaogang Yao,Huixing Lin,Jin-Chao Miao,Di Zhou
This study examines the microwave dielectric properties of the Na 2 O–Bi 2 O 3 –Ln 2 O 3 –MoO 3 (Ln = Sm and Y) system, synthesized via a solid-state process at ultra-low sintering temperatures ranging from 600°C to 660°C. The X-ray diffraction and Rietveld refinement results suggested that a tetragonal sheelite phase was found in the x Na 5 Bi(MoO 4 ) 4 –(1− x )Na 5 Ln(MoO 4 ) 4 (0.05 ≤ x ≤ 0.20) ceramics. Scanning electron microscopy (SEM), backscattered electron image (BSE) and energy dispersive spectrometer (EDS) results indicated that the complex substitution of Bi 3+ produced a significant effect on the microstructural morphology. Besides, the substitution of Bi 3+ for (Sm 0.3 Y 0.7 ) 3+ effectively reduced the sintering temperature to 630°C. The variation of theoretical dielectric polarizabilities (α theo. ), the polarizability density (α theo. / V m ), the observed dielectric constant (ε r ), theoretical dielectric constant (ε theo. ), packing fraction (PF) values, and bond valence ( V i ) as a function of x value were investigated, which was helpful for understanding microwave dielectric properties. The ceramic composition 0.1Na 5 Bi(MoO 4 ) 4 –0.9Na 5 Ln(MoO 4 ) 4 sintered at 630°C for 2 h demonstrated the best microwave dielectric properties, exhibiting a ε r ∼ 9.3, Q × f value of about 31,200 GHz (at 11 GHz) and a temperature coefficient (τ f ) of −41.3 ppm/°C. Both XRD and EDS results indicated that the 0.1Na 5 Bi(MoO 4 ) 4 –0.9Na 5 Ln(MoO 4 ) 4 ceramic was chemically compatible with Ag at its sintering temperature (630°C). The x Na 5 Bi(MoO 4 ) 4 –(1− x )Na 5 Sm 0.3 Y 0.7 (MoO 4 ) 4 (0.05 ≤ x ≤ 0.20) ceramics in the Na 2 O–Bi 2 O 3 –Ln 2 O 3 –MoO 3 (Ln = Sm and Y) system are promising candidates for 5G and its successor 6G mobile communication technology.
研究领域:
材料科学
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电子陶瓷
·
微波通信
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Hesham Y. Amin,Safia Abdullah R. Alharbi,Abd El-razek Mahmoud,Essam A. Elkelany
Herein, a nickel-doped borate glass system, with variable additions of lead oxide, was prepared by melting and air quenching method. The impact of heavy lead oxide on structure, optical, electronic transitions, ligand field and nonlinear optical features was investigated. The glass structure was scrutinized by XRD, indicating the amorphousness of the current glass. The measured and empirical densities increased with lead oxide additions, indicating the densification of the network, while comparing both densities confirms the randomness of the glass network. Infrared spectra confirmed the deteriorated existence of non-bridging oxygen (NBO) bonds and the high ability of lead oxide to modify the glass network and form different structural units such as Pb . The current optical studies revealed the existence of ions in octahedral coordination, with high optical activity within some of the optronic transitions that were observed in visible and infrared regions. Among these optronic transitions, the transitions at 429, 524, 805 and 1222 nm were exploited using a Gaussian deconvolution process to determine the splitting energy and Racah parameters. Bewitchingly, the splitting energy increased; meanwhile, the Racah B and C parameters decreased, indicating that the lead addition increased the ligand- ions interaction energy and decreased the internal electronic interactions inside d-orbitals of ions. As a result of these interactions, the covalent bonding nature increased. Furthermore, lead oxide additions push the glass edges toward low energy, mitigating the optical band gaps from 3.41 eV to 2.92 eV, while Urbach energy increased due to enhanced amorphousness. Due to the higher polarizability of lead ions, the linear and non-linear optical properties of current glasses are enhanced.
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