CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Chen Zhang,Benzheng Gao,Houyang Yu,Xin Wang,Jianliang Xie
CaO–B 2 O 3 –SiO 2 (CBS) is a promising lightweight, low-dielectric matrix material for high-temperature microwave-absorbing coatings. However, the comprehensive study of absorbent morphology evolution within such coatings and its influence on electromagnetic (EM) performance has not been conducted. In this work, a series of FeSiAl (FSA)/CBS composite coatings with various FSA contents were fabricated using atmospheric plasma spraying. The morphological evolution of the FSA phase and the resulting EM properties of the coatings were systematically analyzed. Experimental findings show that during the spraying process, when the size of FSA clusters in the composite powder exceeds the thickness of CBS splats, FSA clusters form a rigid contact with the underlying solidified coating, leading to the development of a lamellar structure. This lamellar FSA phase creates local conductive networks, which significantly increase the complex permittivity of the coating. These results provide valuable guidance for controlling absorbent morphology and optimizing the EM properties of CBS-based coatings.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2021
·Vol. 8
·期 12
·125901
·
IF 1.62
Xiaodong Jia,Shuo Mao,Lin Tian,Shujiang Chen,Guohua Li,Wei Gao
Herein, magnesium metatitanate (MgTiO3) ceramics were synthesised using recycled magnesia-hercynite (MH) bricks as the raw materials to achieve solid waste reusing of cement kiln refractories. The recycled MH materials were mixed with anatase TiO2 to investigate the effect of addition of doped B2O3 during the synthesis of MgTiO3 ceramics at 1400 °C. Phase compositions and microstructural studies were performed using x-ray diffraction (XRD) and scanning electron microscope (SEM), respectively. In addition, energy-dispersive spectroscopy (EDS) was conducted and the dielectric properties of the samples were studied. Results show that the addition of B2O3 can promote sintering, improve shrinkage, promote densification, stabilise MgTiO3 lattice, and inhibit the formation of MgTiO3. In addition, the presence of appropriate amount of B2O3 can accelerate the material diffusion and result in grain growth through the formation of intercrystalline liquid phase. Results also suggest that an increase in dielectric constant results in a decrease in dielectric loss. It was concluded that 2 wt% was the optimum amount of B2O3 required to obtain the most favourable synthesis rate of MgTiO3 (98.2%). The samples exhibited a maximum density of 3.69 g·cm−3 and excellent microwave dielectric properties at εr = 18.28 and tanδ = 0.086.
研究领域:
材料科学
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无机化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2021
·Vol. 329
·期 3
·1467-1476
·
IF 1.371
Yan Meng,Cheng Wencai,Liu Yi,He Xiyang,Wu Biao,Zhang Zhentao,Xie Yi,Lu Xirui
A novel pretreatment method was used to ameliorate the treatment effect of iodine contained radioactive waste. The pretreatment sample (15 w%) held the highest amorphous index (0.50) at 600 °C, and iodine element was in a state of uniform distribution. The density of the sample could increase to 2.95 gcm 3 by using the novel method, which was higher than other similar studies. The leaching result of iodine was as low as 1.53 × 10 6 gm 2 d 1 after 7 days treatment, which indicated that the solidified body has good stability in a long run. Graphic abstract
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2023
·
IF 3.8
Zhuo Xing,Juhai Weng,Chi Ma
A series of Zn 2- x Cu x GeO 4 ceramics were prepared by the solid-phase sintering method. Cu 2+ substitution for Zn 2+ facilitated the single-phase formation and benefited densification via lowering the sintering temperatures , hence thereby the microwave dielectric properties were largely improved. A representative composition with x = 0.08 revealed a homogenous Zn 2 GeO 4 phase with good microwave dielectric properties: ε r ∼ 7.47, Q × f ∼ 56,980 GHz, and τ f ∼ −13.9 ppm/°C when sintered at 1000 °C. To evaluate the potential application of low-temperature cofired ceramics (LTCC), sintering aids (B 2 O 3 ) were added to the x = 0.08 sample to reduce its sintering temperature to below 960 °C. A dramatic improvement in Q × f ∼ 107,415 GHz was observed with only 0.5 wt % B 2 O 3 addition. Chemical compatibility was confirmed via cofiring with silver electrodes at 940 °C. All the merits show promising potential for advanced substrates.
研究领域:
材料科学
·
电子材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Guilin Wei,Xiaoyan Shu,Zhentao Zhang,Qingyuan Li,Yi Liu,Xiao Wang,Yi Xie,Bingsheng Li,Dadong Shao,Xirui Lu
The treatment of radioactive iodine waste is a difficulty in the field of nuclear waste disposal. In this work, the B 2 O 3 –Bi 2 O 3 –ZnO based materials with 50 mol% of B 2 O 3 is chosen to immobilize silver-coated silica gel with different iodine loadings at 500, 550, and 600 °C. The results show that the highest amorphous fraction is gotten as 0.88 for the sample with 20 wt % of iodine in silver-coated silica gel sintered at 600 °C. In addition, both of the amorphous fraction and density increase with increasing temperature. The SEM-EDS result indicates that part of iodine is fixed into the glassy phase and other AgI grains are physically wrapped by the vitrified bulk. Our findings demonstrate the feasibility of B 2 O 3 –Bi 2 O 3 –ZnO based materials for the immobilization of silver-coated silica gel with different iodine loadings.
研究领域:
核废料处理
·
材料科学
·
放射性废物管理
✓ 已验证
DOI
高影响因子
JOURNAL OF NUCLEAR MATERIALS
·
2020
·
IF 2.485
Guilin Wei,Xiaoyan Shu,Zhentao Zhang,Fen Luo,Yi Liu,Bingsheng Li,Yi Xie,Lan Wang,Xirui Lu
The treatment of radioactive iodine waste is particularly difficult because of its volatilization issues. In this study, amorphous silica gel was used to gradually replace crystalline SiO 2 in B 2 O 3 -Bi 2 O 3 -ZnO-SiO 2 based materials aimed to investigate the effects on iodine waste immobilization. Samples with different silica gel replacements (0, 20, 40, 60, 80, and 100%) were characterized by XRD, FT-IR, and SEM-EDS. The results showed that silica gel had a benefit in the immobilization of iodine waste at low-sintering temperatures (500, 550, and 600 °C). At 550 °C, AgI was immobilized in the pure glassy matrix and elements (Ag and I) distributed uniformly on the matrix surface. FT-IR analysis presented the tetrahedral SiO 4 units in the sintered samples that were mainly in the form of sheets. Our work revealed the potential application of silica gel in the field of iodine waste immobilization.
研究领域:
核废料管理
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2021
·
IF 3.531
Xiyang He,Wencai Cheng,Meng Yan,Wanrong Song,Yi Liu,Zhentao Zhang,Tao Ma,Weizhen Liu,Xirui Lu
As to spent fuel reprocessing in the nuclear industry, disposal of iodine-containing silver silica gel (AgIs) is a challenge. Method for immobilizing AgIs with the B-Bi-Zn glass powder at low temperatures has been applied to cope with this dilemma. In ingredient analysis, only diffraction peak of AgI can be detected in the sintered samples. In addition, the element analysis confirmed the existence and distribution of AgI in the solidified matrix. According to leaching experiment, low leaching rate (10 −6 ) demonstrated that the sintered body possessed good chemical stability in liquid circumstance. Based on the research statistics, quality loss ratio of sample (98.58 g) sintered at 600 °C under the gas pressure sintering was merely 1.61%. Meanwhile, the quality retention proportions of AgI and raw powder from thermogravimetric analysis were certified as 98.09% and 96.19% respectively at 600 °C. Therefore, this study comprehensively proved the glass powder curing prospective for AgIs disposal.
研究领域:
核工业
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材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 7
·1-11
·
IF 2.8
Feng Jingmin,Zhang Yajuan,Lu Yang,Shan Yiting,Guo Xiang,Zhou Hongqing
In this study, CaO–B 2 O 3 –SiO 2 (CBS) glass–ceramics were prepared and compounded with different contents of ZrSiO 4 . The sintering behavior, phase composition, microstructure, dielectric properties, thermal properties, and mechanical properties of this CBS glass–ceramic composite ZrSiO 4 ceramic system were investigated. The results show that CBS glass–ceramic can be sintered densely at 750 °C. However, the crystallinity is unexpectedly low and the dielectric properties are greatly damaged. Surprisingly, the addition of ZrSiO 4 improved the dielectric constant of the composites and achieved a dielectric adjustable in the range of 6.0–7.8. When the composite was sintered at 830 °C for 15 min with 35% ZrSiO 4 addition, the bulk density of the composite increased to 2.93 g/cm 3 . The dielectric constant measured at a high frequency of 13 GHz was 6.93 and the dielectric loss of 1.66 × 10 –3 . Accordingly, the addition of ZrSiO 4 reduced the thermal expansion coefficient of the composite to 6.1 ppm/°C and increased the flexural strength of the composite to 248 MPa.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 10
·781
·
IF 3.504
Xinli Yang,Nan Wu,Yongxia Miao,Haobo Li
Tungsten oxide (WO3) and boron oxide (B2O3) were irreversibly encapsulated into the nanocages of the Zr-based metal organic framework UiO-66, affording a hybrid material B2O3-WO3/UiO-66 by a simple microwave-assisted deposition method. The novel B2O3-WO3/UiO-66 material was systematically characterized by X-ray diffraction, Fourier transform infrared spectroscopy, N2adsorption, ultraviolet–visible diffuse reflectance spectroscopy, scanning electron microscopy, transmission electron microscopy, X-ray phosphorescence, and Fourier transform infrared (FTIR)-CO adsorption methods. It was found that WO3and B2O3were highly dispersed in the nanocages of UiO-66, and the morphology and crystal structure of UiO-66 were well preserved. The B2O3species are wrapped by WO3species, thus increasing the polymeric degree of the WO3species, which are mainly located in low-condensed oligomeric environments. Moreover, when compared with WO3/UiO-66, the B2O3-WO3/UiO-66 material has a little weaker acidity, which decreased by 10% upon the B2O3introduction. The as-obtained novel material exhibits higher catalytic performance in the cyclopentene selective oxidation to glutaraldehyde than WO3/UiO-66. The high catalytic performance was attributed to a proper amount of B2O3and WO3with an appropriate acidity, their high dispersion, and the synergistic effects between them. In addition, these oxide species hardly leached in the reaction solution, endowing the catalyst with a good stability. The catalyst could be used for six reaction cycles without an obvious loss of catalytic activity.Keywords:UiO-66;WO3;B2O3;metal organic frameworks;cyclopentene;glutaraldehyde
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Shenghui Han,Gang Lian,Xu Zhang,Zhaozhen Cao,Qilong Wang,Deliang Cui,Ching-Ping Wong
Developing metal-free room-temperature phosphorescence (RTP) materials with ultralong lifetimes in dry and wet states simultaneously has been widely concerned due to their potential applications, which is also a tough challenge up to now. Herein, a smart construction strategy is proposed to in-situ embed boron nitride dots (BNDs) into an isogenous B 2 O 3 matrix. The BND-based materials exhibit unexpected bluish-green RTP in solid and various wet conditions (water, oxidants, organic solvents, strong acids and bases). The RTP lifetime of them in powder is as long as ~ 1.7 s, lasting over 10 s to naked eye. B 2 O 3 matrix can not only uniformly disperse the BNDs in it, but also provide a rigid environment via forming hydrogen-bonded and covalently bonded interactions between them to strongly stabilize the triplet states excitions on the dots from nonradiative deactivation. More interestingly, RTP quenching of the BND-based powder in various solutions is effectively suppressed because the B 2 O 3 matrix is not collapsed in them. For instance, the RTP lifetime in water is as long as ~ 0.9 s. Based on the distinctive RTP properties in dry and various harsh wet states, the applications of the BND-based RTP materials in multi-level anti-counterfeiting and information encryption are demonstrated.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ANNALS OF NUCLEAR ENERGY
·
2020
·
IF 1.378
Guilin Wei,Fen Luo,Bingsheng Li,Yi Liu,Jingjun Yang,Zhentao Zhang,Yi Liu,Xiaoyan Shu,Yi Xie,Xirui Lu
This study mainly investigated the Bi 2 O 3 -B 2 O 3 -ZnO ternary glass to immobilize the iodine waste forms under low sintering temperatures (≤600 °C). Based on the results of Molecular Dynamic (MD) code GULP and amorphous fraction, the Bi 2 O 3 -B 2 O 3 -ZnO ternary glass with 20 mol% Bi 2 O 3 to be chosen to immobilize the sliver-coated silica gel with 10 wt%, 20 wt% and 30 wt% iodine loadings (total content of iodine is 8 wt%). The results show that the amorphous fraction are increased with temperature rising and the composition has dominant effect on determining the density results. The specimen with 20 wt% sintered at 600 °C has the highest amorphous fraction as 0.71. The SEM-EDS results reveal that part of iodine had been physically solidified in the form of white spots and the rest chemically solidified in the glassy phase. Our findings demonstrate the potential of Bi 2 O 3 -B 2 O 3 -ZnO ternary glass to immobilize iodine waste forms.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Chen Zhang,Xin Wang
In this paper, CaO-B 2 O 3 -SiO 2 (CBS) is utilized as matrix material of microwave coating for the first time to achieve high-performance microwave absorption under high-temperature. A series of FeSiAl (FSA)/CBS composite coatings were prepared via atmospheric plasma spraying. The impact of spraying power on the microstructure, electromagnetic properties, and high-temperature stability of as-sprayed coatings were studied. The experimental results reveal that CBS could effectively suppress the formation of the lamellar structure of FSA as the low initial melting temperature, also form unexpected Fe 2 SiO 4 structure with FSA during the spraying process. The increase in complex permittivity of the coating is primarily attributed to enhanced coating density and the development of Fe-rich regions within the CBS matrix. Furthermore, the dense coating prevents the oxidation of FSA and exhibits high-temperature stability. Our coating of 1 mm thickness has a reflection loss below -5 dB with frequency range of 7–14.8 GHz at 500 °C.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）