CERAMICS INTERNATIONAL
·
2026
·
IF 6
Asmae Mimouni,M.S. Sadeq,Hesham Y. Amin
The present work investigates the influence of borosilicate glass network polymerization on the structural, magnetic, and optical behavior of Ni 2+ ions. Borosilicate glasses containing a fixed concentration of NiO were synthesized using the melt-quenching technique with systematic substitution of B 2 O 3 by SiO 2 . XRD confirmed the amorphous nature of all samples, while FTIR spectroscopy revealed a progressive transformation from a borate-rich to a silicate-rich network, characterized by an increase in BO 4 units and a marked reduction in non-bridging oxygens (NBOs). Density and molar volume analyses supported the formation of a more compact and polymerized glass network with increasing SiO 2 content. EDX results verified the homogeneous incorporation of constituent elements within the glass matrix. Electron paramagnetic resonance (EPR) spectra exhibited broad and asymmetric signals characteristic of Ni 2+ ions in distorted octahedral coordination. A gradual decrease in EPR signal intensity and a slight narrowing of linewidth were observed with increasing SiO 2 concentration, attributed to reduced dipole–dipole interactions and enhanced spin–lattice relaxation in a more polymerized network. Optical absorption spectra showed characteristic spin-allowed transitions of Ni 2+ ions, accompanied by systematic redshifts of absorption bands with increasing SiO 2 content. Ligand field analysis revealed a decrease in the Racah parameter (B) and nephelauxetic ratio (β), indicating enhanced covalency of the Ni–O bonds due to increased glass network connectivity and reduced NBO concentration. The strong correlation between FTIR, EPR, and optical results demonstrates that the local electronic structure of Ni 2+ ions is governed by glass network polymerization, highlighting the tunability of borosilicate glasses for optical and photonic applications.
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高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2026
·
IF 3.3
Yuan Jiasheng,Yang Xiao
Electrodeposition of boron and borides in molten CaCl 2 −CaO−B 2 O 3 offers a versatile route to boron-based materials, yet the dissolution chemistry of B 2 O 3 in molten CaCl 2 −CaO and the associated phase relationships remain insufficiently understood. Here, we investigate B 2 O 3 dissolution in molten CaCl 2 −CaO between 1073 K and 1223 K. The solubility of B 2 O 3 increases with temperature and demonstrates a linear dependence on CaO concentration. Dissolution proceeds via the formation of the solid intermediates Ca 2 BO 3 Cl and Ca 2 B 5 O 9 Cl, followed by dissociation of Ca 2 B 5 O 9 Cl into soluble ions. Raman-based speciation indicates that dissolved boron occurs predominantly as metaborate species ( \({\text{BO}}_{2}^{ - }\) ) present as short-chain units and six-membered rings. Additionally, phase relationships in the CaCl 2 -rich region of the CaCl 2 −CaO−B 2 O 3 ternary system are established across the studied temperature range. These findings provide a thermochemical foundation for designing and optimizing fluoride-free CaCl 2 −based molten salt systems for boron electrodeposition.
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高影响因子
CERAMICS INTERNATIONAL
·
2013
·
IF 1.789
Qing Ma,Songping Wu,Yingxian Fan
Zn 2 SnO 4 ceramics were synthesized by the solid-state method. B 2 O 3 was added into the system to lower the sintering temperature . B 2 O 3 -doped Zn 2 SnO 4 materials were characterized by X-ray diffraction (XRD), electron microscopies (SEM/TEM/HRTEM/EDS), Raman and XPS spectroscopies. The inverse-spinel Zn 2 SnO 4 ceramics (containing 1 wt% B 2 O 3 ) sintered at 975 °C exhibited good microwave dielectric properties : ε r =9.3, Q × f =62,000 GHz and τ f =−50 ppm/°C. Zn 2 SnO 4 ceramics with low sintering temperatures are promising candidate materials for low-temperature cofired millimeter-wave devices.
研究领域:
材料科学
·
电子工程
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高影响因子
COMBUSTION EXPLOSION AND SHOCK WAVES
·
2017
·Vol. 53
·期 1
·55-64
·
IF 0.889
Liu J.,Liang D.,Xiao J.,Chen B.,Zhang Ya.,Zhou J.,Cen K.
Primary combustion products of boron-based propellants are incomplete combustion products that are emitted from the gas generator of a solid ducted rocket. Studying the composition of primary combustion products provides valuable information about the primary combustion process and also helps to better understand the secondary combustion process. The particle size of the primary combustion products is analyzed by a laser particle size analyzer. The qualitative analysis of the sample composition is performed by using x-ray diffraction, x-ray photoelectron spectroscopy, and thermogravimetry–differential scanning calorimetry experiments. Based on these results, an integrated quantitative analysis of the sample composition is conducted. The quantitative analysis methods include tube furnace heating, ion chromatography, infrared spectroscopy, and inductively coupled plasma chromatography. In addition, scanning electron microscopy and energy dispersive spectrometry are also used to analyze the micro-morphology and distribution of different components in the sample. The primary combustion products mainly contain B, C, B
m
C
n
, H 3 BO 3 , B 2 O 3 , BN, Mg, MgCl 2 , and NH 4 Cl. B
m
C
n
(22–24%), H 3 BO 3 (20%), and B (16.8%) are the three major components, while B
m
C
n
, B, and C (9.8–11.8%) are the three combustible components present in the highest amounts. The oxidant NH 4 ClO 4 is completely consumed during the primary combustion, while the metal additive Mg does not show much reactivity. The micro-morphology and distribution of B
m
C
n
, H 3 BO 3 (or B 2 O 3 ), B, Mg, and C in the sample are investigated. Some components in the primary combustion products are found to be agglomerated, while some components are dispersed. Large particles in the sample mainly include B and Mg, while B
m
C
n
, H 3 BO 3 (or B 2 O 3 ), and C particles are small. In general, the combustion completeness of the primary combustion products is rather low. Therefore, better understanding and controlling of the secondary combustion process is very important to improve the performance of B-based propellants.
研究领域:
化学工程
·
航空航天工程
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高影响因子
Materials
·
2022
·Vol. 15
·期 10
·3675
·
IF 3.748
Haibo Pang,Shiquan Zhang,Lei Pan,Suohui Yang,Jian Zhang,Minxian Shi,Zhixiong Huang,Junguo Li,Qiang Shen
The reliable mechanical properties of ceramizable silicone rubber composites during pyrolysis are necessary for their application in the fire-resistant fields. The effects of liquid-phase amount on the mechanical properties of silicone rubber composites are investigated. The results show a positive correlation between the liquid-phase amount and the flexural strength of the residual products pyrolysis below 800 °C. The nano-γ-Al2O3in the fillers reacts with liquid B2O3to form aluminum borate above 800 °C, which consumes the liquid phase and strengthens the residual products to a certain extent. Increasing the B2O3addition and introducing nano-γ-Al2O3can control the liquid-phase amount in the range of 15% to 30%, which makes the composites have better residual strength and support performance. The residual strength of composites pyrolysis at 500 °C to 1000 °C is higher than 2.50 MPa, and the maximum is up to 18.7 MPa at 1000 °C.Keywords:B2O3;Al2O3;liquid phase;mechanical properties;ceramizable silicone rubber composites
研究领域:
材料科学
·
火灾安全工程
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2023
·Vol. 32
·期 23
·10626-10636
·
IF 2.3
Zhao Santuan,Xing Donghua,Zhen Kai,Niu Zhongpei,Li Guangda
The wetting and spreading of glass binders on silver have an important influence on the properties of conductive silver paste. Therefore, it is necessary to consider the wettability between glass binder and silver when designing conductive silver paste. In the present work, the wettability of the Bi 2 O 3 -B 2 O 3 (-ZnO)/silver system was studied in detail. A high temperature contact angle measuring instrument was used to study the dynamic contact angles of different glass/silver systems. After the wetting test, the microstructure of the surface and cross section of the droplet/substrate was studied. In addition to the bulk liquid usually observed, the precursor membrane was observed near the triphase line. The wetting and spreading of glass melt are mainly controlled by the viscosity of glass melt and the blocking effect of the triphase line. In the process of heating up, the wetting process of glass/silver system can be divided into three stages: incubation stage, temporary equilibrium stage, and rapid spreading stage. The content of zinc oxide has a great influence on the wetting behavior of Bi 2 O 3 -B 2 O 3 (-ZnO)/silver systems.
研究领域:
材料科学
·
化学
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高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Lin-Lin Zhu,Min-Min Dai,Xin Xu,Cheng-Cai Zhao,Guang-Xiang Zhang,Yu-Jian Jian,Wei-Ming Guo,Hua-Tay Lin
The alumina ceramics were joined by spark plasma sintering (SPS) at 1000 °C for 10 min under an applied pressure of 30 MPa using the screen-printed B 2 O 3 as the joining material. The thickness of the interlayers after joining was approximately 5 μm. The average shear strength measured of the joint was 141.9 ± 4.1 MPa, which was the highest value of joined alumina ceramic using B 2 O 3 only ever reported in the open literatures. The presence of Al 4 B 2 O 9 whiskers formed by the in-situ reaction between B 2 O 3 and Al 2 O 3 was assumed to contribute to the strong joint. A sample with extra holding at 400 °C for 10 min before 1000 °C was conducted to investigate the suppression effect of joining parameter on the volatilization of B 2 O 3 . The average shear strength was 104.2 ± 9.4 MPa, which implied that low-temperature holding step promoted rather than suppressed B 2 O 3 volatilization, resulting in lower shear strength.
研究领域:
材料科学
·
陶瓷工程
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Peng Zhang,Yufei Bai,Kang Liu,Xin Jin,Min Wang,Qinghua Sun,Hongjiang Jiang
Tricalcium phosphate (TCP) scaffolds are widely recognized for their use in bone tissue engineering. However, suboptimal mechanical properties and limited bioactivity often hampered their application. This study presents a novel approach to enhance the performance of TCP scaffolds through a combination of composite doping and surface modification. TCP scaffolds were doped with 3 % boron oxide (B 2 O 3 , BO) via 3D ink printing. These scaffolds were subsequently immersed in the graphene oxide (GO) solution for surface modification to form GO0.25 scaffolds. The incorporation of B 2 O 3 significantly enhances the mechanical properties and cell viability of TCP scaffolds. When sintered at 1150 °C, the TCP/BO3 scaffolds achieve optimal mechanical characteristics, with a compressive strength of 32.68 MPa and an elastic modulus of 1833.19 MPa. Additionally, the GO surface modification improves cell adhesion and upregulates the expression of osteogenic genes. Mineralization degradation experiments indicated that the GO0.25 scaffolds possessed excellent bioactivity. Furthermore, cellular experiments demonstrated that the scaffolds significantly enhanced cell adhesion, spreading, and osteogenic differentiation. In vivo rat cranial defect experiments confirmed that GO0.25 scaffolds exhibited the most effective cranial bone repair. These findings suggest that TCP/BO/GO scaffolds, developed through composite and surface modifications, hold significant potential for future applications in bone tissue regeneration.
研究领域:
生物医学工程
·
组织工程
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Hongcheng Yang,Qingyu Wen,Enzhu Li
Lithium borosilicate (LBS) and lithium fluoride (LiF) are verified to be effective sintering aids for CaAl 2 B 2 O 7 microwave dielectric ceramic to reduce the sintering temperature and lower the activation energies . Benefiting from the liquid phase sintering , low-firing, low permittivity and low-loss CaAl 2 B 2 O 7 microwave dielectric composite has been successfully obtained. Typically, CaAl 2 B 2 O 7 assembled with 1 wt % LBS composite possesses desirable properties of ε r = 5.91, Q × f = 39,443 GHz, τ f = −23.51 ppm/°C (@16.53 GHz). For composite ceramics with 0.5 wt % LiF, the optimal microwave dielectric properties are ε r = 6.08, Q × f = 37,295 GHz, τ f = −22.39 ppm/°C (@15.78 GHz). The two kinds of composite are densified at 875 °C, with co-existed CaB 2 O 4 and liquid phase. The mechanism underlying the low temperature sintering is revealed by well-matched wettability and lower activation energy of composite ceramics with additions.
研究领域:
材料科学
·
电子工程
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高影响因子
Waste and Biomass Valorization
·
2017
·Vol. 9
·期 11
·2181-2190
·
IF 1.337
Han Bin,Zhao Peng,He Rong,Wu Tinghua,Wu Ying
A series of supported B 2 O 3 /ZrO 2 –Al 2 O 3 (BZA) catalysts with different loading B 2 O 3 were prepared and characterized by XRD, FT-IR, XPS, NH 3 -TPD, N 2 adsorption–desorption and FT-IR (pyridine adsorption). These catalysts were applied for direct conversion of glucose to 5-hydroxymethylfurfural (HMF). An optimized HMF yield of 41.2% at a glucose conversion of 90.8% was obtained within 4 h at 150 °C over B 2 O 3 (20 wt%)/ZrO 2 –Al 2 O 3 (BZA-0.20). The best catalytic performance of BZA-0.20 was associated with the highest amount of total acid. The simultaneously bearing Lewis acid and Brønsted acid sites were more efficient for production of HMF from glucose.
研究领域:
化学工程
·
催化科学
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高影响因子
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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高影响因子
Open Ceramics
·
2026
·
IF 3.4
Xingpu Hu,Zhaoran Li,Guoqi Liu,Fan Qian,Mao Chen,Yongqiang Chen
Side seal plates for thin-strip continuous casting require exceptional resistance to thermal shock, corrosion and wear, for which h-BN based ceramics serve as promising candidates. However, h-BN-ZrO 2 -SiC composites suffer from poor sintering densification. h-BN-ZrO 2 -SiC composites modified with varying amounts of B 2 O 3 as a single additive were prepared via vacuum hot-press sintering at 1550 °C, 1600 °C and 1650 °C. The phase composition, microstructure, relative density, flexural strength and thermal shock resistance were systematically investigated. The composite with 1 wt% B 2 O 3 sintered at 1650 °C achieved a flexural strength of 76.6 MPa, which was 42% higher than that of the additive‑free sample. The results revealed that B 2 O 3 facilitates the in-situ formation of ZrB 2 via a liquid‑phase sintering mechanism. This work clarified the modification mechanism of B 2 O 3 in h-BN-based composites, providing experimental basis and theoretical guidance for the development of h‑BN‑based ceramics used for side dams in thin‑strip continuous casting.
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高影响因子
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