JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
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2018
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IF 3.647
Wanchun Yang,Qin Sun,Qing Lei,Wenbo Zhu,Yufeng Li,Jun Wei,Mingyu Li
A new Pb-free Ag paste containing a Bi 2 O 3 -B 2 O 3 -ZnO glass frit was developed for Al 2 O 3 substrate metallization . First, Bi 2 O 3 -B 2 O 3 -ZnO glass frits with various compositions and glass transition temperatures (T g ) of 322 °C–440 °C were synthesized by using a traditional melt-quenching method. Then, silver pastes containing different contents of the glass frit were sintered on an Al 2 O 3 substrate at temperatures ranging from 450 °C to 600 °C. The glass frit content and the sintering temperature had significant impacts on the electrical resistivity and shear strength of the product. The experimental results indicated that the silver film formed from the paste containing 7 wt.% glass frit and sintered at 600 °C for 15 min had a low electrical resistivity of 2.5 μΩ cm and a high strength of 28.5 MPa. These properties resulted from the formation of a stable glass network that supported the Ag network. Furthermore, ZnAl 2 O 4 was observed to form close to the interface of the Al 2 O 3 substrate, which could improve the shear strength . Moreover, the Bi-based glass frit could be a suitable substitute for Pb-based glass frits in the preparation of environmentally friendly silver pastes for forming thick Ag films on Al 2 O 3 substrates.
研究领域:
材料科学
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电子材料
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陶瓷与复合材料
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烧结技术
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2022
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IF 6.364
Qin Sun,Ludong Yang,Wanchun Yang,Hongjun Ji,Mingyu Li,Yufeng Li
Ceramics and metal joinings have been widely employed in aerospace, dental implants , and the electronic packaging industry for fabricating multifunctional components. In this study, the 35Bi 2 O 3 -50B 2 O 3 -15ZnO (mol.%) glass has been employed for joining the ZrO 2 ceramic and Ti-6Al-4V alloy. The effect of brazing temperature on the microstructure evolution, mechanical properties , and bonding mechanism of brazed joints has been analyzed. The microstructure of the ZrO 2 /glass/Ti-6Al-4V joints and the content of Bi 4 B 2 O 9 , Bi 2 O 3 and Bi 24 B 2 O 39 precipitated crystals in glass were found to be dependent on the brazing temperature. The reaction product of Bi 4 Ti 3 O 12 was identified in the glass/Ti-6Al-4V interface because of the chemical reaction between the oxidized layer of Ti-6Al-4V alloy and glass. A maximum shear strength as high as 48.8 ± 5.2 MPa was obtained. Our work, thus, demonstrates that the 35Bi 2 O 3 -50B 2 O 3 -15ZnO glass is an effective bonding material for joining ZrO 2 ceramic and Ti-6Al-4V alloy under low temperature in an ambient atmosphere.
研究领域:
材料科学
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焊接工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
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IF 8.035
Jian Wang,Yaofeng Mao,Jie Chen,ZiJian Li,Jun Wang,Fude Nie
Boron (B) shows great potential applications in the military and aerospace industry due to its high calorific value. However, the reactivity is limited by the inert oxide layer (B 2 O 3 ) that covers the B particles. Herein, nano-Al, and Fluorographene (FG) are employed as coating materials to enhance the ignition and combustion efficiency of boron. When graphite fluoride (GF) was utilized as an oxidizer (the B/GF mass ratio is 1:9), the maximum heat release of B@nano-Al/GF (∼5.6 kJ/g) and B@FG/GF (∼5.4 kJ/g) were markedly higher than that of raw B/GF (∼2.5 kJ/g), ascribed to the self-activation effect of the coating layer. On this basis, the combustion experiments were performed and their performances were compared and studied. Specifically, the ignition delay time of B@nano-Al/GF and B@FG/GF was decreased to 320 ms 262 ms, respectively, compared with that of raw B/GF (380 ms) with 15 W laser power. This is consistent with the ignition burning test, where the B@6%nano-Al/GF and B@2%FG/GF have higher flame height than raw B/GF. However, the maximum pressure and pressurization rate decreased for B@6%nano-Al/GF and B@2%FG/GF because of the reduced amount of gas caused by decreased boron content. Additionally, the effects of the B/GF mass ratio (1:9, 2:8, 3:7, 4:6) on the combustion performances of composites were fully studied. The pressure output, combustion reaction, and ignition delay time are reduced with B/GF mass ratios increased. This work could provide a general approach to improve the ignition and combustion performance of boron.
研究领域:
材料科学
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航空航天工程
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军事技术
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2022
·
IF 6.364
Cunku Wang,Jie Ding,Zhixiong Huang,Yingluo Zhuang,Yan Li,Minxian Shi,Yan Qin
In this work, two ceramizable phenolic adhesives were prepared using ZrSi 2 particles or ZrSi 2 /B 4 C mix particles as the inorganic fillers. The thermal stability, bonding strength , microstructure and phase composition of the adhesives were investigated by TGA , shear strength of Al 2 O 3 joints, SEM, EDS , XRD and XPS . The results show that these two adhesives have different bonding performances and ceramicization evolutions above 600 °C in air due to the addition of the second phase particles B 4 C. The bonding strength of ZrSi 2 /B 4 C modified phenolic adhesive after treatment at 1200 ℃ can be as high as 36.6 MPa, while the bonding strength of ZrSi 2 modified phenolic adhesive under the same conditions is only 17.5 MPa. B 4 C undergoes oxidation reaction before ZrSi 2 , and the oxidation product B 2 O 3 liquid phase not only reacts with ZrSi 2 to form oxidation-resistant ZrB 2 , but also can dissolve the high temperatures defects of the adhesive and chemically bond with the Al 2 O 3 substrates at the interface.
研究领域:
材料科学
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胶粘技术
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热工程
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表面科学
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
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2026
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IF 6
Aidi Xie,Wusong Geng,Chun Chen,Yunxia Zhang,Haimin Zhang,Guozhong Wang
A mesoporous SiO 2 -supported Ag catalyst co-modified with B 2 O 3 and amino groups (B/Ag@NH 2 −MS) was synthesized through the grafting of amino group onto silica and subsequent impregnation with 10 wt.% Ag and 5 wt.% B 2 O 3 . Density functional theory (DFT) calculations and Bader charge analysis showed that boron (B) doping triggered extensive electronic changes in the modified support. It implied that B atoms gained a partial positive charge, showing Lewis acidic nature, while nearby Ag atoms had a partial negative charge. This electronic redistribution led to a downward movement of the Ag d -band center and a decrease in the work function, which in turn modulated the binding energies of adsorbates and reduced the desorption barrier of MG. Such dual-site cooperation strengthened the adsorption and polarization of the DMO carbonyl group at the adjacent Ag and B sites, thus promoting the activation of the C = O bond. Moreover, the anti-sintering capacity of Ag nanoparticles could be ascribed to their efficient stabilization mechanism, resulting from the synergistic action of oxygen-bridged B/O/Ag species and –NH 2 functional groups.Consequently, it is noted that the catalyst is able to maintain a conversion of about 99% DMO and a selectivity of about 94% MG, and it was able to maintain a conversion rate of over 96% for >350 h. These observations highlight a dual-site electron synergy strategy for developing very active and long-lasting Ag catalysts for ester hydrogenation.
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Luobin Zhang,Qin Sun,Jintao Wang,Zheng Zhang,Weiwei Zhang,Jianqiang Wang,Hongtao Chen,Mingyu Li
We studied the feasibility of using Bi-based lead-free glass paste as bonding material on soda-lime glass substrates, without any activation preparation on the bonding surfaces. In order to fabricate Bi 2 O 3 -B 2 O 3 -ZnO-BaO-SrO system low-melting glass frit, quenching is performed using deionized water after melting using a muffle furnace. Glass paste consisting of glass frit mixed with organic solvent is deposited on the surface of the soda-lime glass substrate by screen printing, and the sealing of the glass substrate is finally achieved at the bonding temperature (500 °C). we discuss the properties of glass powder, the joint microstructure of irregular amorphous glass, the shear properties and the glass frit bonding mechanism based on the characterization results of DSC , XRD , FTIR, Raman, XPS , SEM and TEM. Furthermore, the investigation concentrated on mechanical properties and microstructural characterization of the joined area with two silica substrates. As the SrO content increased from 0 to 3 mol%, T g increased from 396 °C to 418 °C with increasing SrO content. Accompanied by an increase in SrO content from 1 mol% to 2 mol%, the room-temperature shear strength of the glass specimens increased from 28.5 to 45 MPa. The growth of Bi 24 B 2 O 39 crystallites precipitated at the interface was studied.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
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2026
·
IF 2.1
Xuzhou Zeng,Hongyan Wang,Chunhu Zheng,Peihu Shen,Qianhong Shen,Hui Yang,Minjia Wang
A B 2 O 3 -doped glass-ceramic/fluororesin (Gc/ECTFE) laminated coating was developed for long-term corrosion protection of steel substrates. The relationship between B 2 O 3 content, glass-network structure, and barrier performance was investigated through microstructural characterization, corrosion behavior tests, and molecular dynamics simulations. At the optimal B 2 O 3 content (5 wt%), B 3+ was predominantly incorporated into the siloxane network as [BO 4 ] tetrahedra, enhancing glass-network polymerization, densification, and SiO 2 crystallization to form a compact and stable barrier structure. In contrast, excessive B 2 O 3 (≥ 10 wt%) increased [BO 3 ] units, causing network loosening and reduced protection. After 90 days in 3.5 wt% NaCl solution, the 5-Gc/ECTFE coating exhibited the highest corrosion resistance, with R ct = 3.765 × 10 4 Ω·cm 2 , nearly three orders of magnitude higher than that of the undoped system. Simulations revealed the lowest diffusion coefficients for H 2 O and Cl − (2.743 × 10 −8 and 9.771 × 10 −9 m 2 ·s −1 ), confirming from diffusion kinetics that the dense glass network effectively suppresses corrosive-medium permeation and improves long-term barrier durability.
✓ 已验证
DOI
高影响因子
MATERIALS CHARACTERIZATION
·
2026
·
IF 6.2
Haohua He,Panpan Lin,Tong Wu,Qianrun Zhang,Haodong Li,Ligupan Zhang,Xin Yue,Tiesong Lin,Peng He
In this article, we designed a novel Bi 2 O 3 -B 2 O 3 -BaO-Fe 2 O 3 (BBBF) magnetic glass-ceramic braze with various Fe content to fabricate YIG ferrite. • The network structure, thermal properties, crystallization behavior, magnetism of the glass braze were systemically reported. • YIG/BBBF glass /YIG joints showed desirable mechanical reliability and magnetic performance by controlling the in-situ crystallization of target phase BaFe 12 O 19 . • The highest shear strength of the joints was 62.6 MPa and the maximum of the joints' saturation magnetization intensity was 28.01 emu/g (over 97% of the base material), which is the first time that the magnetic performance of YIG/YIG joint has reached such a level. • We have revealed the regulation mechanism of the target magnetic phases on the magnetic performance of the joints, providing a theoretical basis for further improving the performance of functional device. A new designed Bi 2 O 3 -B 2 O 3 -BaO-Fe 2 O 3 magnetic glass-ceramic braze was developed to fabricate yttrium iron garnet ferrite (YIG) integrated structure. The magnetism level of the glass braze was controlled by in-situ crystallization of magnetic phase BaFe 12 O 19 and transitional phases. The saturation magnetization intensity of the glass brazes reached its maximum of 7.83 emu/g after designed heat-treatment for crystallization. YIG/BBBF glass/YIG joints showed not only outstanding mechanical strength but also desirable magnetic performance. The shear strength of the joints was up to 62.6 MPa, and the saturation magnetization intensity of the joints was up to 97% of YIG base material, which indicated almost no attenuation of the joints' magnetic performance compared with YIG base material. The mechanisms of the target magnetic phase BaFe 12 O 19 on the mechanical and magnetic performance of the joints were deeply elaborated, laying theoretical foundation for the magnetic control of ferrite device joints.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xiaoyang Wang,Jianguo Huang,Hao Feng,Jinfeng Li,Zidie Pu,Xiangchun Yin
The hierarchical architecture constitutes one of the key factors affecting the performance of microwave absorbing materials (MAMs). Herein, core-shell Fe 3 O 4 with a dendritic hierarchical structure is fabricated successfully by the melting method in a SiO 2 -B 2 O 3 -Al 2 O 3 -CaO-Fe 2 O 3 multi-component system. The multiple transmission scattering absorption mechanism is mediated by the unique microstructure, thus improving the impedance matching and the microwave loss ability of the material. According to its reflection loss curve, the microwave absorption was efficiently optimized, yielding a minimum reflection loss (R L ) of − 54.26 dB when the thickness was 3.47 mm, and the effective bandwidth (R L <10 dB) for electromagnetic wave reflectance reached 3.28 GHz (6.48–9.76 GHz) with a sample thickness of 1.8 mm. The present work adds new useful information for the designing of high-performance glass-ceramic MAMs.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Chen Yang,Donglei Bu,Shaoming Huang
Traditional method for preparing boron carbon nitride (BCN) usually involves solvents in the pretreatment process before pyrolysis at high temperature. Here, we report that highly porous BCN with controllable 3D morphology can be synthesized successfully by rapid solvent-free ball milling followed by pyrolysis processes using B 2 O 3 , dicyandiamide (DCD) and polyvinylpyrrolidone (PVP) as the sources of B, N and C, respectively. It is found that the porosity of the synthesized BCN varies from the amount of carbon source and the maximum specific surface area of 1386.7 m 2 g -1 with pore volume of 1.13 cm 3 g -1 can be achieved. The as-synthesized porous BCN materials exhibit excellent sorption capacities for methyl blue (MB), Congo red (CR) and basic yellow-1 (BY) up to 1220, 865.2 and 560 mgg −1 , respectively. Such outstanding adsorption performance is mainly due to the high porosity with polar surface of the BCN. Furthermore, the BCN can be easily regenerated by combustion in air at 400 °C and used repeatedly.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）