JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2016
·Vol. 80
·期 1
·126-132
·
IF 1.473
Su Xinghua,Zhou Jie,Wang Benpan,Zhao Peng
Abstract Al 2 O 3 –ZrO 2 composite ceramic nanopowders were synthesized using a polyacrylamide gel method. The mean particle size of the Al 2 O 3 –ZrO 2 nanopowders was found to decrease with increasing mole ratio of monomer to the precursor salt. The Al 2 O 3 –ZrO 2 nanopowders with mean particle size of 10 nm can be densified in 1 h at 965 °C, by application of a dc electrical field. Under a constant dc electrical field, the current density through the sample of Al 2 O 3 –ZrO 2 rose rapidly when the temperature increased to a certain value. In the sintering process, the current density was restricted when a sharp increase occurred. It was found that current density had a great effect on the sintering process in electric field-assisted sintering. Joule heating was proposed to be the main mechanism of the electric field-assisted sintering process. Graphical Abstract The Al 2 O 3 –ZrO 2 composite ceramic nanopowders were synthesized using a polyacrylamide gel method. The Al 2 O 3 –ZrO 2 nanopowders can be densified in 1 h at low temperature, by the application of a dc electrical field. Under a constant dc electrical field, the current density through the sample of Al 2 O 3 –ZrO 2 rose rapidly when the temperature increased to a certain value.
研究领域:
材料科学
·
陶瓷
·
纳米技术
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 26
·20518-20531
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IF 2.779
Luo Huan,Li Hao,Yuan Shengxu,Li Jinchao,Zhang Yaping,Duan Hao,Li Jing
In this work, the Li-rich manganese layered oxide Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 (LMNC in short) is coated with a novel Al 2 O 3 –ZrO 2 layer for lithium-ion battery application. Three modified LMNC materials including AZ1, AZ2 and AZ3 with different mass ratios between Al 2 O 3 –ZrO 2 coating and LMNC are successfully prepared. Al 2 O 3 –ZrO 2 coating layer inhibits the side reactions, restricts the transformation of layered structure and enhances the stability of LMNC. The coated LMNC shows the most excellent electrochemical performance for application in lithium-ion battery, when the mass ratio between Al 2 O 3 –ZrO 2 coating layer and LMNC is 2 wt% (AZ2). The specific discharge capacity of AZ2 (111.0 mAh g −1 ) is significantly higher than that of pristine LMNC (i.e., AZ0) (85.6 mAh g −1 ) at the 10 C rate. Moreover, the AZ2 shows outstanding durability during the 200 times cycling charge and discharge tests at 1 C, whose capacity retention rate and voltage decay are 81.6% and 370.1 mV after 200 cycles, respectively. Specifically, the voltage decay rate of AZ2 is much lower than those of most reported Li-rich manganese layered oxides. Therefore, the as-prepared AZ2 cathode material with excellent electrochemical performance has a bright future for lithium-ion battery application.
研究领域:
材料科学
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能源存储技术
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产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2022
·Vol. 43
·期 4
·2175-2183
·
IF 3.531
Lu Cheng,Wenfeng Liu,Ziqi Zhang,Yongcun Zhou,Shengtao Li
To simoutinusly achieve improved breakdown strength (BDS) and suppressed dielectric loss, a modified ternary nanocomposite composed of polypropylene (PP), maleic anhydride-grafted PP and core-shell structure SiO 2 @ZrO 2 nanoparticles is proposed. By tailoring the thickness of SiO 2 shell from 3 to 11 nm and the nanofillers content from 0.5 to 5 wt%, the particles disparsion is improved and meanwhile both the deep trap density and the interaction force between molecules are enhanced. In consequence, the restricted transportation of electrons along molecule chains as well as between chains together raise the DC BDS, that the BDS of optimum sample film reaches 430.8 kV/mm, 23% higher than neat PP. Besides, the ternary nanocomposites with SiO 2 @ZrO 2 less than 3 wt% maintain the tanδ below 0.3% at a broad frequency ranging from 0.1 Hz to 100 kHz, which is an extremely low level same as neat PP.
研究领域:
材料科学
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电气工程
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产品关联
DOI
高影响因子
Journal of Manufacturing Processes
·
2022
·
IF 5.684
Lizheng Zhang,Hao Liu,Haihua Yao,Yong Zeng,Jimin Chen
3D printing technology was introduced into the manufacturing of ceramic components. To obtain a new lightweight multifunctional structure with novel structure and excellent performance, and promote the deep combination of additive manufacturing and optimization design, ZrO 2 (3Y)/Al 2 O 3 hollow lattice structure ceramics with two kinds of high precision and different porosity were prepared by vat photopolymerization in this paper, and the process optimization, microstructure evolution , and performance were studied. The hollow lattice structure with good molding accuracy and porosity of 35 %–55 % was prepared by component design, optimization of slurry, degreasing, and sintering process , which effectively avoided the ceramic cracking and collapse caused by resin volatilization. When the Al 2 O 3 content was 6 wt%, dense ZrO 2 (3Y)/Al 2 O 3 ceramics with grain refinement, excellent microhardness , and fracture toughness were obtained. The relationship between lattice structure and compressive strength was analyzed by simulation and compressive test . The results show that the compressive strength of the two hollow lattice structures decreases with the increase of porosity. The maximum compressive strength of 35 %-face-centered cubic (FCC) hollow lattice structure is 326 MPa, which is significantly higher than that of body-centered cubic (BCC) structure (240 MPa) with the same porosity. The hollow lattice ceramic structure with good comprehensive performance and lightweight will lay a foundation for the application of industrial heat insulation , high temperature catalysis, and purification carrier in the future.
研究领域:
材料科学
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先进制造
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产品关联
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
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2022
·Vol. 48
·期 6
·2557-2573
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IF 3.134
Liu Yueyu,Yin Zhili,Wang Ziqing,Mou Ronglin,Wei Zhong
High surface area ZrO 2 –KOH sample was prepared and used the catalyst for the synthesis of glycerol carbonate (GC) from dimethyl carbonate (DMC) and glycerol. The structure properties of ZrO 2 –KOH were characterized by XRD, BET, CO 2 -TPD, XPS, and ICP-OES. It was found that the strong basicity of ZrO 2 –KOH might be attributed to the oxygen vacancies as well as the big surface area. Experiments were developed to evaluate the effects of catalysis loading, proportion of reactants, temperature and reaction time on the conversion of glycerol to GC. The consequences showed that ZrO 2 –KOH was a highly efficient basic catalyst for synthesis of GC from glycerol. The catalytic performance of ZrO 2 –KOH is much better than that of ZrO 2 –KOH–CP, ZrO 2 –NH 4 OH, and some reported heterogeneous catalysts. And the higher performance of ZrO 2 –KOH was ascribed to the strong basicity. 99.43% conversion was obtained in a particular situation of catalyst/glycerol weight ratio of 3 wt%, DMC/glycerol molar ratio of 3:1, reaction temperature of 80 °C, and reaction time of 2 h. The plausible reaction mechanism for the transesterification on the strong basic active sites was discussed.
研究领域:
催化
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化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
Materials Today Sustainability
·
2025
·
IF 7.9
Pengyuan Guan,Yongjie Zhao,Yihui Wu,Weixian Li,Xiao Zhang,Xiang Gao,Xiaoxia Ou,Wai Siong Chai,Yinfeng He,Hao Nan Li
CuO–ZnO–ZrO 2 catalyst attracted significant attention for CO 2 hydrogenation to methanol. Gyroid-based triply period minimal surface lattice structures feature highly ordered porous networks, which could be used to enhance catalytic performance and efficiency. This paper presents a formulating and one-step calcination strategy that united the removal of polymer resin and calcination of catalyst precursor at one temperature. This enabled 3D printing gyroid-structured CuO–ZnO–ZrO 2 catalyst for CO 2 hydrogenation while minimizing the impact of overheating on the catalyst performance. A photocurable formulation loaded with CuO–ZnO–ZrO 2 precursor was developed. Using the optimized formulation, gyroid structures with varying pore sizes were successfully printed and calcined. The optimal lattice wall thickness that balances porosity and structural stability was identified. The results indicate that the resin used for 3D printing was successfully removed at a lower temperature and the catalytic activity of the 3D-printed structured catalyst was retained through the one-step calcination process while the gyroid lattice geometry can enhance catalytic efficiency than cylindrical structure.
研究领域:
材料科学
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催化化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2023
·Vol. 52
·期 4
·2614-2625
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IF 2.1
Jiang Xi,Zhang Yun,Ding Shihua,Song Tianxiu,Hou Zhengpeng,Xiao Junwen,Wang Yarong
MO-ZrO 2 -Ta 2 O 5 (M = Zn, Co) ceramics were prepared by solid-phase reaction method. Thermo-gravimetric-differential thermal behavior, crystal structure, and microwave dielectric properties of ZnO-ZrO 2 -Ta 2 O 5 and CoO-ZrO 2 -Ta 2 O 5 ceramics were compared in this paper. Both of them exhibited monoclinic wolframite structure. Densest microstructures with uniform grains were obtained at 1400°C and 1425°C in the cases of M = Zn and Co, respectively. ZnO-ZrO 2 -Ta 2 O 5 and CoO-ZrO 2 -Ta 2 O 5 exhibited comparable ε r ~ 20.26 and 24.30, while the former had Q × f ~ 60, 983 GHz and the latter had Q × f ~ 95,300 GHz. The grain growth exponent and activation energy obtained from the phenomenological kinetic equation indicated the growth process of ceramics. The grain growth of Zn-based ceramic was dominated by interfacial reactions and lattice diffusion. For the other one, the grain growth mechanisms were grain boundary diffusion and lattice diffusion at high temperatures. The grain growth progress of them both affected by lattice diffusion. The growth process of ZnO-ZrO 2 -Ta 2 O 5 ceramics was faster than that of CoO-ZrO 2 -Ta 2 O 5 ceramic. However, the grains were overgrown and grew slowly at 1425°C and 1450°C, which was caused by the excessive high temperature.
研究领域:
材料科学
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陶瓷
·
微波技术
·
固体物理
✓ 已验证
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2025
·
IF 6.1
Pengxing Yu,Ruoyun Wang,Kai Wang,Huabing Liu,Biyou Peng,Hongjian Huang,Junwu Xiang,Haiyang Zhou,Tong Zhou
To enhance the long-term corrosion resistance of 3D-printed AlSi10Mg alloy, this work designed a two-step micro-arc oxidation (MAO) strategy. Given the difficulty of triggering micro-arc discharge in high-Si Al alloys, an intermediate transition layer was first prepared through one-step MAO in a silicate electrolyte. Subsequently, a two-step MAO treatment was performed in a phosphate electrolyte with the addition of K 2 ZrF 6 to seal the ablation holes formed during the one-step MAO process, achieving a self-sealing effect of the MAO coating. Ultimately, a dense ZrO 2 /Al 2 O 3 ceramic coating with Si-W-Zr-P gradient distribution was obtained on the AlSi10Mg surface after the two-step MAO. Electrochemical tests reveal that the two-step MAO coating exhibits exceptional corrosion resistance, with a remarkably low corrosion current density (I corr ) of 3.42 × 10 −9 A·cm −2 , along with a protective efficiency (η p ) of up to 99.8 %. Moreover, no obvious macroscopic corrosion signs are observed on the ZrO 2 /Al 2 O 3 coating after prolonged immersion, and its I corr remains stable at 9.26 × 10 −9 A·cm −2 , indicating durable protective performance. This study offers a novel and controllable strategy for the design of anti-corrosive coatings on 3D-printed high-Si Al alloys.
✓ 已验证
DOI
高影响因子
FUEL
·
2019
·
IF 5.128
Wenjing Song,Weikun Lai,Yixin Lian,Xingmao Jiang,Weimin Yang
Catalytic transformation of lignin is a sustainable way to provide aromatics, which depends on the structure and property of catalytic sites. A bifunctional sulfated ZrO 2 supported CoMo sulfide catalyst has been synthesized by in situ exsolution approach. The exsolved CoMo-sZr(exs) catalyst significantly enhanced the initial C–O bond cleavage rate (0.058 mol·g −1 ·h −1 ) compared to the impregnated and physically mixed sulfated ZrO 2 supported CoMo sulfide catalysts. Notably, the reusability tests also showed that the as-prepared catalyst presented total ethers conversion of 94% with aromatics yield of 86% after four consecutive cycles. This was related to the appropriate sulfide-support interaction, acid sites and highly-dispersed CoMo sulfide, in conformity with the catalyst characterization. Thereby it could facilitate reactant adsorption and effectively break down the C–O bonds in lignin derived fragments to form aromatics. This work points out a new avenue for the design of effective bifunctional catalysts for lignin depolymerization.
研究领域:
催化化学
·
可再生能源化学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Le Fu,Zihua Lei,Wenjun Yu,Mingxi Deng
The limited flexibility in terms of chemical composition restricts the microstructure and property regulation possibilities of ZrO 2 -Al 2 O 3 binary ceramic composites (BCCs). Therefore, it is significant to prepare ternary ceramic composites by introducing a third phase. In this study, a fixed proportion of amorphous SiO 2 (30 mol%) was incorporated as the third phase to develop ZrO 2 -Al 2 O 3 -SiO 2 ternary ceramic nanocomposites (TCNCs) with two distinct Zr/Al ratios. The TCNCs were fabricated using containerless aerodynamic levitation technology, which featured a large thermal gradient that would facilitate the formation of nano-eutectics. In samples with a Zr/Al ratio of 3:1, monoclinic ZrO 2 was the sole crystalline phase. The Al element was present in either Al-O-Si or Al-O glass phase, depending on the processing temperature; In contrast, ZrO 2 -Al 2 O 3 nano-eutectics were formed in samples with a Zr/Al ratio of 3:8, accompanied by the generation of mullite crystallites. The SiO 2 phase functioned as an amorphous matrix. Vickers hardness of the TCNC with a Zr/Al ratio of 3:8 exhibited comparability to that reported for ZrO 2 -Al 2 O 3 composites.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
Green Energy & Environment
·
2020
·
IF 6.395
Yuewen Shao,Tingting Wang,Kai Sun,Zhanming Zhang,Lijun Zhang,Qingyin Li,Shu Zhang,Guangzhi Hu,Xun Hu
Oxides with different crystal phases can have important effects on the configuration of surface atoms, which can further affect the distribution of hydrogenation sites and acidic sites as well as the competitions of these varied types of catalytic sites. This could be potentially used to tailor the distribution of the products. In this study, zirconium oxides with different crystal phases supported copper catalysts were prepared for the hydrogenation of the biomass-derived furfural, vanillin, etc. The results showed that both calcination temperature and Cu species affected the shift of zirconia from tetragonal phase to the monoclinic phase. Monoclinic zirconia supported copper catalyst can effectively catalyze the hydrogenation of furfural to furfuryl alcohol via hydrogenation route due to its low amount of Brønsted acidic sites, although the surface area and the exposed metallic Cu surface area were much lower than the tetragonal zirconia supported copper catalyst. Zirconia with tetragonal or tetragonal/monoclinic phases supported copper catalysts contain abundant acidic sites and especially the Brønsted acidic sites, which catalyzed mainly the conversion of furfural via the acid-catalyzed routes such as the acetalization, rather than the hydrogenation. The acidic sites over the Cu/ZrO 2 catalyst played more predominant roles than the hydrogenation sites in determining the conversion of the organics like furfural and vanillin.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 25
·37746-37756
·
IF 0
Tian You,Han Zhitao,Li Yeshan,Zhao Hongzhe,Zeng Qingliang,Cheng Shaoshi
The selective catalytic oxidation (SCO) is an effective method for removing slipped high-concentration ammonia from NH 3 -fueled engine exhaust gas. Herein a novel bifunctional catalyst was synthesized by mechanically mixing sulfated Ce/ZrO 2 (Ce/ZrO 2 -S) with a small fraction of Pt/Al 2 O 3 (Pt 0.1 wt.%) for SCO of NH 3 . As expected, the introduction of a small amount of Pt/Al 2 O 3 significantly improved NH 3 conversion ability of Ce/ZrO 2 -S catalysts toward low-temperature direction. When the mass ratio of Pt/Al 2 O 3 to Ce/ZrO 2 -S was 7.5% (the corresponding mixed catalyst was denoted as P@CZS-7.5), T 90 temperature was 312 °C. More importantly, P@CZS-7.5 catalyst exhibited a much better N 2 selectivity (> 96%) in a wide temperature range (320 ~ 450 °C). H 2 -TPR results revealed that the addition of a trace amount of Pt/Al 2 O 3 significantly led to a distinct shift of reduction temperature peak toward low-temperature direction, thereby greatly improved the low-temperature redox performance of mixed catalysts. Furthermore, NH 3 -TPD and BET results showed that P@CZS-7.5 catalyst exhibited a similar NH 3 adsorption capacity to Ce/ZrO 2 -S catalyst, while the former had a relatively higher specific surface area than the latter. It was considered as a crucial factor for P@CZS-7.5 catalyst maintaining superior N 2 selectivity in high-concentration NH 3 (5000 ppm) removal processes. In situ DRIFTS results indicated that P@CZS-7.5 catalyst followed the internal selective catalytic reduction (i-SCR) mechanism in NH 3 -SCO reactions.
研究领域:
催化化学
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环境科学
✓ 已验证
DOI
危险品化学品经营许可证（带存储）