CRYSTENGCOMM
·
2022
·Vol. 24
·期 10
·1859-1865
·
IF 3.756
Shouzhen Li,Fan Wu,Xuan Zhang,Guangting Han,Yang Si,Jianyong Yu,Bin Ding
Developing ceramic materials for thermal insulation is vital for various applications. However, ceramics have been considered intrinsically rigid and brittle due to the limited crystallographic slips and structural collapse during service. Their lack of flexibility has hampered many high-end applications of ceramic materials. We developed flexible Al2O3/ZrO2 nanofibrous membranes via sol–gel electrospinning and calcination. Al2O3/ZrO2 nanofibrous membranes had flexibility from −196 °C to 1300 °C and low thermal conductivity (∼0.03166 W m−1 K−1 at room temperature). They also supported 1350-times their weight without suffering structual damage. Hence, Al2O3/ZrO2 nanofibrous membranes could be used for thermal insulation in aerospace and industrial fields, and even in harsh environments.
研究领域:
材料科学
·
热工程
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Shouzhen Li,Xiaota Cheng,Guangting Han,Yang Si,Yitao Liu,Jianyong Yu,Bin Ding
Developing ceramic nanofibrous membranes for the thermal insulation layer of firefighting protective clothing is vital. However, previous ceramic nanofibrous membranes were brittle and easy to break during service in high-temperature environments. The lack of elastic and compressible properties has limited the high-end applications of ceramic nanofibrous membranes. In this work, elastic and compressible Al 2 O 3 /ZrO 2 /La 2 O 3 nanofibrous membranes were fabricated via sol–gel electrospinning and calcination in air at different temperatures. The as-fabricated Al 2 O 3 /ZrO 2 /La 2 O 3 nanofibrous membranes can maintain excellent elasticity and compressibility in the temperature ranging from −196 to 1400 °C. Moreover, they have low thermal conductivity and high working temperatures. These favorable characteristics make the Al 2 O 3 /ZrO 2 /La 2 O 3 nanofibrous membranes a promising candidate for the thermal insulation layer of firefighting protective clothing.
研究领域:
材料科学
·
纳米技术
·
防火工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NANO
·
2021
·
IF 1.556
Tianqi Zhou,Canxing Yang,Han Wu,Guodong Jiang,Jian Xiong,Qing Ai,Renzhong Huang,Songdong Yuan
Al 2 O 3 –ZrO 2 was coated on the surface of nickel-rich cathode materials by the sol–gel method to improve its electrochemical performance. The nanometer-thick Al 2 O 3 –ZrO 2 coating layer refrains the side reaction between the electrolyte and the electrode, thus preventing the collapse of LiNi 0 . 8 Co 0 . 1 Mn 0 . 1 O 2 layered structure and protecting the stability of the material. The electrochemical test shows that LiNi 0 . 8 Co 0 . 1 Mn 0 . 1 O 2 coated with Al 2 O 3 –ZrO 2 has good cycle and rate performance. Under the cut-off voltage of 2.8–4.5 V, LiNi 0 . 8 Co 0 . 1 Mn 0 . 1 O 2 coated with Al 2 O 3 –ZrO 2 delivered an initial capacity which was 166.7 mAh g − 1 at 1C (200 mAh g − 1 ) rate, and the capacity retention rate was 77.7% after 200 cycles. The pristine LiNi 0 . 8 Co 0 . 1 Mn 0 . 1 O 2 delivered an initial capacity which was 166.4 mAh g − 1 at 1C rate, and the capacity retention rate was 51.7% after 200 cycles. The EIS and CV provided the enhanced electrochemical performance of LiNi 0 . 8 Co 0 . 1 Mn 0 . 1 O 2 coated with Al 2 O 3 –ZrO 2 which was due to accelerating Li + diffusion of nickel-rich materials and electrolytes.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
MATERIALS CHARACTERIZATION
·
2022
·
IF 4.537
Jianlong Chai,Yabin Zhu,Peng Jin,Tielong Shen,Lijuan Niu,Shufen Li,Minghuan Cui,Zhiguang Wang
SiC-Al 2 O 3 -ZrO 2 ceramic composite with heterointerfaces was prepared by hot pressing and irradiated with 1.2 MeV Si ions at room temperatures. The microstructural evolution and mechanical properties were investigated. The results showed that the phase transformation of zirconia revealed by GIXRD and TEM are associated with the accumulation of oxygen vacancies clusters originated by damage and the size of displacement cascades. Complete amorphization of SiC particles were observed at 5.5 dpa, and developed into collection band at 55 dpa due to the mixture of point defect clusters and extend defects at high damage level. The nanohardness and elastic modulus irradiation decreased with increasing of damage level. The fracture behavior of materials and relative mechanism under ion irradiation were discussed.
研究领域:
材料科学
·
核材料工程
✓ 已验证
DOI
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
·
2021
·Vol. 52
·期 2
·767-775
·
IF 2.556
Zhu Yabin,Chai Jianlong,Shen Tielong,Wang Zhiguang
Al 2 O 3 -ZrO 2 -TiC composites with different proportions of TiC were prepared by ball milling and spark plasma sintering. Structural characterization revealed that the composites exhibited fine and homogeneous microstructures. No other phases except α-Al 2 O 3 , t-ZrO 2 and c-TiC were detected by XRD in all Al 2 O 3 -ZrO 2 -TiC composites. The internal stress induced by the mismatch of the thermal expansion coefficients result in a shift of t-ZrO 2 diffraction peak. SEM and TEM observations showed that the Al 2 O 3 grain size was inversely proportional to the TiC content, while the grain sizes of ZrO 2 and TiC stayed nearly constant. HRTEM micrograph presented that there are glassy phase boundaries with thickness of several nanometers around the TiC grains. As the TiC content increases, the relative density and hardness decreased from 99.2 to 97.7 pct and from 21.0 to 15.8 GPa, respectively. Compared with Al 2 O 3 -ZrO 2 matrix, composites with TiC exhibited lower flexural strength but enhanced fracture toughness. Composite with TiC of 10 vol pct possessed the best friction property. The increased porosity was mainly responsible for the deterioration of mechanical and friction properties except for the fracture toughness. The improvement in fracture toughness with increasing TiC content was attribute to the crack deflection and pinning effects induced by the TiC particles.
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Jinjin Ban,Chaojie Zhou,Long Feng,Quanli Jia,Xinhong Liu,Junhua Hu
ZrB 2 -SiCw (w-whisker) composite powders were synthesized by a microwave-assisted carbo/borothermal reduction method under argon atmosphere using zircon , boric acid, and activated carbon as starting materials. The optimized ZrB 2 -SiCw composite powder was obtained by adjusting heating temperature and amounts of boric acid and activated carbon. Further, the effect of the optimized ZrB 2 -SiCw composite powder addition on corrosion resistance of the Al 2 O 3 –ZrO 2 –C slide plate material against O 2 and Ca-treated steel was investigated. The results showed that the relative content of ZrB 2 -SiCw increased with increasing temperature. The excess of boric acid favored the formation of the ZrB 2 -SiCw, and the optimum amount of boric acid was overdosed to 30–45 wt%. The corrosion resistance and thermo-mechanical properties of Al 2 O 3 –ZrO 2 –C slide plate material could be improved effectively with 6 wt% ZrB 2 -SiCw composite powder addition, which was attributed to the excellent oxidation and corrosion resistance of ZrB 2 -SiCw composite powder. In addition, ZrB 2 -SiCw could confer excellent thermal shock resistance and reduce the generation of cracks, ultimately preventing corrosive media from infiltrating into slide plates, further increasing corrosion resistance of the plates.
研究领域:
材料科学
·
冶金工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Mao Chen,Zijie Song,Haoyuan Lei,Hailong Wang,Shaojun Zhang,Rui Zhang,Hongxia Li,Bingbing Fan,Yongqiang Chen
Customized porous Al 2 O 3 -ZrO 2 -mullite composites were designed and prepared by reaction sintering of zircon (ZrSiO 4 ) and alumina (Al 2 O 3 ) at sintering temperatures from 1400 to 1600 °C for 3 h. The mechanical properties , microstructural evolution , and reaction mechanisms of the composites were investigated. The reactions between ZrSiO 4 and Al 2 O 3 were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectrometer (EDS). The results indicate that ZrSiO 4 and Al 2 O 3 react and form ZrO 2 and mullite . Sintering temperature has an important effect on the reaction process. At 1400 °C, Al 2 O 3 reacts directly with SiO 2 of ZrSiO 4 to form mullite and ZrO 2 , which reduces the decomposition temperature of ZrSiO 4 and promotes the decomposition of ZrSiO 4 . However, at 1600 °C, ZrSiO 4 first decomposes to form SiO 2 and ZrO 2 , and then generates mullite by the diffusion of Si. The migration of Si is the key factor for the formation of mullite. The thermal shock resistance of the composites can be significantly improved by phase transformation toughening of in-situ ZrO 2 . Therefore, increasing the proportion of ZrSiO 4 can significantly improve the mechanical properties of sample. The residual ratio of the flexural strength after thermal shock exceeded 90%, when the mass ratio of ZrSiO 4 to Al 2 O 3 was 3:1. Besides, the addition of polymethyl methacrylate could improve the porosity of materials and has a direct effect on the thermal conductivity of 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
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
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 26
·20518-20531
·
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
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Yabin Zhu,Jianlong Chai,Tielong Shen,Lijuan Niu,Yiwen Liu,Peng Jin,Minghuan Cui,Yucheng Feng,Liangting Sun,Zhiguang Wang
Ceramic composites are promising candidates as structural materials for future fission and fusion reactors. In present work, Al 2 O 3 -ZrO 2 -SiC ternary ceramic composites were irradiated with 2.0 MeV He-ions at 300 and 800 ℃. Grazing incidence X-ray diffraction results confirmed that there was irradiation induced shift and broadening of diffraction peaks, but no amorphization of Al 2 O 3 -ZrO 2 -SiC composite were observed up to fluence of 1.72 × 10 18 ions/cm 2 . Transmission electron microscopy observations showed that throughout the entire irradiation region, nano-sized helium bubbles are mostly distributed in Al 2 O 3 grains and partly in ZrO 2 grains, while no detectable bubbles are observed in SiC grains. No obvious agglomeration of bubbles was found at grain/phase boundaries. By using nanoindentation technique, slight hardening or softening was confirmed for the samples irradiated at 300 and 800 ℃ respectively. The absence of amorphization and surface exfoliation indicating the Al 2 O 3 -ZrO 2 -SiC composite exhibits remarkable resistance to He-ions irradiation.
研究领域:
材料科学
·
核工程
·
陶瓷
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Tianqi Zheng,Wei Wang,Jinxing Sun,Jing Liu,Jiaming Bai
Digital Light Processing (DLP) is a promising approach to fabricate delicate ceramic components with high-fidelity structural features. In this work, the alumina and zirconia/alumina ceramic suspensions with low viscosity and high solid loading (40 vol%) were prepared specifically for DLP 3D printing . After debinding and sintering, the final parts were obtained without any defects. The surface morphologies and mechanical properties of alumina (Al 2 O 3 ) and zirconia toughened alumina (ZTA) composites were investigated and the results showed that the final parts exhibited high relative densities and good interlayer combination at the sintering temperature of 1600 °C. Comparing with the Al 2 O 3 , the ZTA composites exhibited significantly enhanced density (99.4%), bending strength (516.7 MPa) and indentation fracture toughness (7.76 MPa m 1/2 ).
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2020
·
IF 4.652
Jianlong Chai,Yabin Zhu,Zhiguang Wang,Tielong Shen,Yiwen Liu,Lijuan Niu,Shufen Li,Cunfeng Yao,Minghuan Cui,Chao Liu
Al 2 O 3 –ZrO 2 (3Y)–SiC ceramic composites were prepared by spark plasma sintering in vacuum under 40 MPa of uniaxial compression between 1300 °C and 1400 °C. The effect of nano-size SiC and sintering temperature on the microstructure and mechanical properties of ceramic composites were investigated. The results showed that SiC particles was uniformly distributed in the composite, mainly within the matrix grains. Sintering temperature and SiC particles caused the shape of alumina grains to be columnar. The flexural strength of 22.3 vol% Al 2 O 3 -57.7 vol% ZrO 2 -20 vol% SiC sintered at 1350 °C composites was 1081 MPa, fracture toughness was 15.18 MPa m 1/2 and hardness was 16.42 GPa. The addition of SiC particles leads to grain boundary strengthening, and the change of fracture mode and cracks deflection and bridging are considered to be the main reasons for the increase in material fracture toughness.
研究领域:
材料科学
·
陶瓷学
·
复合材料
·
固态物理
·
结构材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）