COMPOSITES SCIENCE AND TECHNOLOGY
·
2022
·
IF 9.879
Yuchen Tong,Zhufeng Hu,Min Wang,Chao Yang,Junbo Xu
In the present study, CF-ZrO 2 /ZrC composites with controllable coating thickness were prepared by an in-situ sol-gel method. Through pretreatment , the carbon fibers surface changed from hydrophobic to hydrophilic and the polar groups on the surface significantly increased, which increased the interface affinity and ensured the stabilities of uniform ZrO 2 /ZrC coatings preparation. The coating layer increases the thickness of the composites, prolonged the mass and heat transfer on the composites surface. The dense ZrO 2 /ZrC coating prevents further oxidation of internal C by oxidative gas. As a result, after 4 cycles sol-gel, the mass ablation rate of the composite is decreased from 0.046 to 0.022 mg s −1 , under the butane flame for 120s. And the thermal decomposition temperatures are 10.8%–15% higher than those of the original carbon fiber. Thus, this in-situ sol-gel method is a feasible for preparing carbon fiber self-reinforced composites with uniform coating and designable structure, which can effectively improve the ablative resistance ability and thermal decomposition temperature of composites.
研究领域:
材料科学
·
陶瓷复合材料
·
抗烧蚀性能
·
溶胶-凝胶工艺
·
表面改性
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2013
·
IF 2.112
Hualin Jiang,Pinghua Chen,Shenglian Luo,Xinman Tu,Qun Cao,Meng Shu
A novel nanocomposite with a BET surface area of 212.9 m 2 /g was synthesized from chitosan and Fe 3 O 4 /ZrO 2 using an inexpensive protocol at mild condition. The Fe 3 O 4 /ZrO 2 /chitosan composite has the ability to adsorb both nitrate and phosphate. The maximum adsorption amount of nitrate and phosphate is 89.3 mg/g and 26.5 mg P/g, respectively. The adsorption process fits well to the pseudo-first-order kinetic rate model, and the mechanism involves simultaneous adsorption and intra-particle diffusion. The experimental results suggest that the composite is a promising adsorbent for treating water that is contaminated with nutrients.
研究领域:
环境科学
·
材料科学
·
水处理
·
纳米技术
·
环境污染控制
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·Vol. 44
·期 2
·1362-1369
·
IF 2.986
Xiaokai Li,Yangyang Xu,Xiaojian Mao,Qiangqiang Zhu,Junxi Xie,Minghui Feng,Benxue Jiang,Long Zhang
Highly transparent ZrO 2 -doped Y 2 O 3 ceramics were successfully synthesized using the hot isostatic pressing (HIP) process. The effects of the ZrO 2 content on the sintering behaviors , optical transmission spectra, Vickers hardness , grain size, size distribution, and Raman spectra were determined. The results indicated that decreased ZrO 2 content could promote increased transmittance, red-shifted infrared cutoff wavelength , increased thermal conductivity , decreased Vickers hardness, and increased lattice ordering. According to the optical transmission spectra, the optimized ZrO 2 content was 0.50 at%, at which point the ceramic exhibited a larger pre-sintering temperature range of 1650–1750 °C and the average grain size of 3.35 µm at 1750 °C. The grain size was significantly decreased at lower pre-sintering temperatures. Furthermore, a moderate Vickers hardness of 8.42 GPa and high thermal conductivity of 10.85 W/m K at room temperature were obtained for the optimized ceramic.
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·Vol. 50
·期 7
·12539-12548
·
IF 5.1
Wei Dang,Ziang Li,Bowen Wang,Zhuoli Xu,Xinyuan Zhang,Fuping Li,Kang Zhao,Jun Ma,Yufei Tang
Because of the inherent high-temperature resistance, the application of ZrO 2 nanofiber aerogels in thermal insulation is promising. However, the contradiction between mechanical and thermal insulation properties has limited its applications. In the present work, nanofiber aerogels of ZrO 2 /SiO 2 /C with enhanced thermal insulation and compressive strength were successfully prepared by freeze-casting using tetraethoxysilane (TEOS) as a binder. The effect of TEOS content on the microstructure, compressive and thermal insulation properties was investigated. The porosity of the fabricated aerogels is higher than 97.3 %. The pore structure exhibits hierarchical characteristics, with honeycomb pores on the micro-scale and mesopores on the nano-scale. Part of the SiO 2 phases generated by TEOS hydrolysis bond ZrO 2 nanofiber to form fiber junctions, while the others cover the surface of ZrO 2 nanofibers forming core-shell structure. With the increase of TEOS content, ZrO 2 /SiO 2 /C nanofiber aerogels showed a slightly decrease in thermal conductivity to a lower value of 0.032 W m −1 K −1 and an increase in compressive stress to 11.9 KPa. The thermal insulation mechanism and deformation mode during compression of aerogels were analyzed. This study not only provide ZrO 2 /SiO 2 /C nanofiber aerogels with both enhanced mechanical and thermal insulation properties, but also can guide the design and fabrication of other ceramic aerogels with excellent properties.
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·Vol. 46
·期 3
·3400-3405
·
IF 3.45
Dehua Ma,Luyi Zhu,Benxue Liu
Improving the infrared reflectivity of ZrO 2 polycrystalline fibers is of great benefit to its thermal applications. In the present research, we cast a highly uniform TiO 2 coating with a thickness ranging from dozens to hundreds of nanometers on ZrO 2 fibers by utilizing hydrothermal growth. The coating bonds tightly to the ZrO 2 fibers via Zr–O–Ti chemical linkages, and the thickness of the coating can be tailored by varying the hydrothermal growth time. The TiO 2 coating, acting as a sheath towards electromagnetic radiation, not only reflected light with wavelengths ranging from the visible region to the infrared region and up to 8 μm but also shielded the Raman signals of the ZrO 2 fibers. The present research provides an efficient way to cast controllable and uniform coatings on flexible fiber materials. The obtained ZrO 2 fibers coated with TiO 2 may have applications such as reinforcement for bulk ceramics, thermal barrier coatings , aerogels , etc. , thus performing the dual functions of mechanical strengthening and thermal insulation .
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·Vol. 49
·期 11
·18371-18378
·
IF 5.2
Qiujun Hu,Junbiao Guo,Hanyang Zuo
Bismuth telluride (Bi 2 Te 3 )-based thermoelectric materials have been commercially utilized for refrigeration and energy conversion at room/near room temperature. However, n -type Bi 2 Te 3 compounds always exhibit inferior performance compared with their p-type counterparts, which is pronouncedly impeding Bi 2 Te 3 -based energy converters from further optimizations. Herein, a promising ZT value ( ZT = 1.33) was obtained in n-type Bi 2 Te 2.7 Se 0.3 (BTS) materials by using an interface engineering strategy to synergistically optimize the electron and phonon transport properties. In detail, ZrO 2 ceramic nanoparticles (NPs) were entered into BTS matrix to construct high-density heterogeneous interfaces. The heterogeneous interfaces strongly scatter phonons and lower energy carriers, leading to decreased thermal conductivity and increased Seebeck coefficient, while the electrical conductivity is not sacrificed due to the compromise of the slightly reduced carrier mobility by interfacial scattering and the increased carrier concentration by ZrO 2 NPs doping. A planar module consisting of 127 pairs of p-n single legs were assembled. At the temperature difference of 200 K, the output power and energy conversion efficiency reached 9.6 W and 6.2%, respectively. This strategy provides a feasible way to rationally design advanced n-type Bi 2 Te 2.7 Se 0.3 materials with excellent thermoelectric and mechanical properties induced by high-density heterogeneous interfaces.
✓ 已验证
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2024
·Vol. 22
·期 1
·e14889
·
IF 1.8
Haopeng Cai,Kun Jiang,Lihua Gao,Yinglong Wei
In this paper, we prepared Al 2 O 3 –ZrO 2 –SiB 6 composite ceramics with excellent performance by introducing the second-phase high-strength healing agent SiB 6 in zirconia-toughened alumina system, artificially created cracks using Vickers hardness tester, investigated the effects of heat treatment temperature (600–1200°C) and time (0–300 min) on the microscopic morphology and bending strength of the ceramics, revealed the healing mechanism, and studied the oxidation resistance properties. It was found that the healing effect was better at heat treatment of 90 min at 700°C and 60 min at 800°C, and the flexural strength was restored to more than 95% of that of the smooth specimens in both cases. Crack repair was mainly achieved by the reaction of SiB 6 , ZrB 2 , and B 4 C with O 2 . Below 800°C, healing was mainly achieved by the reaction of SiB 6 and B 4 C with O 2 , and the generated B 2 O 3 and SiO 2 migrated toward the crack to repair it. When the healing temperature is higher than 800°C, ZrB 2 also reacts with oxygen to produce B 2 O 3 and t-ZrO 2 . It was found that the oxidation weight gain per unit area of the Al 2 O 3 –ZrO 2 –SiB 6 ceramic composite at different temperatures was small, and it has excellent oxidation resistance.
研究领域:
材料科学
·
陶瓷
·
高温材料
·
复合材料
·
力学性能
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 9
·3970-3983
·
IF 3.5
Liu Sisi,Deng Yuxing,Jiang Shengqiang,Liu Jingang
Poly (2-methacryloyloxyethyl phosphorylcholine) (PMPC), as a highly hydrophilic as well as biocompatible material, has been widely used in biomedical applications. In this study, the friction reduction and wear resistance of HXLPE were improved by grafting PMPC on its surface. However, the PMPC will be sheared off during friction, which is difficult to meet the long-term service requirements of artificial joints. This can be achieved by improving the lubrication environment to minimize PMPC shedding. To simulate the human lubrication environment, free PMPC (lubrication factor) and Cu 2+ (transition group metal ion catalyst) were added to neonatal bovine serum (NBCS). When the friction pair consisting of grafted PMPC-modified HXLPE and Cu/ZrO 2 ceramics is rubbed therein, the grafted PMPC interacts with the free PMPC, while Cu 2+ catalyzes the oxidative hydrolysis of serum proteins into carbon-containing small molecules and adsorbs on the surface of the Cu/ZrO 2 ceramics to form a carbon-rich lubrication layer. The composite lubrication layer consisting of grafted-free PMPC and carbon-rich lubrication layer provides good load-bearing and lubrication properties at the friction interface. And the wear rate is reduced by 45% compared to rubbing in deionized water. This technique can reduce the shedding of grafted PMPC state and improve the load-bearing performance of the interfacial lubrication layer, thus reducing the wear of HXLPE and prolonging the service life of the artificial joint.
研究领域:
生物医学工程
·
材料科学
·
摩擦学
·
表面工程
·
高分子科学
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2017
·
IF 3.091
Shiwei Ma,Shiyi Chen,Ahsanullah Soomro,Wenguo Xiang
Fe2O3 is an excellent active metal oxide for chemical looping hydrogen generation (CLHG) with high conversion of CO to CO2 in the reduction stage, and high H2 mole fractions in the subsequent steam oxidation stage, especially for its low cost and abundance in nature. However, supports are generally used to improve its reactivity and stability and to eliminate its carbon deposition. In this paper, Fe-based oxygen carriers are prepared by a coprecipitation method with three supports, i.e., CeO2, ZrO2, and Al2O3. The reactivity, carbon deposition, redox stability, and sintering characteristics of the oxygen carriers are analyzed to investigate the effects of supports as well as the fundamental mechanism. The results show that the properties of the oxygen carriers highly rely on the support and its interaction with iron oxide. The oxygen carrier supported on Al2O3 exhibits poor reactivity and stability, and the oxygen carrier supported on ZrO2 leads to much carbon deposition, decreasing H2 purity, despite its high reactivity and stability. Nevertheless, the oxygen carrier supported on CeO2 demonstrates good reactivity and stability with no carbon deposition observed, and the reducible support CeO2 counteracts the negative effect originating from sintering and guarantees the reactivity and stability of Fe2O3/CeO2 due to its oxygen mobility property and the oxygen mobility enhancement originating from the formation of Fe–Ce solid solution and perovskite-type CeFeO3. Overall, the reducible CeO2 is a potential support to improve the redox characteristics of iron oxygen carrier in CLHG, and the Fe2O3/CeO2 exhibits the highest reactivity at 850 °C. In addition, all three oxygen carriers are characterized by scanning electron microscopy images, energy dispersive X-ray spectrometer analysis, and X-ray diffraction patterns before and after the redox cycles.
研究领域:
能源技术
·
材料科学
·
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2026
·
IF 7.6
Jingwei Wu,Faqiang Chen,Wanxin Wei,Yunfeng Su,Jingqing Zhang,Wei Yan,Guoqing Wei,Zhenjun Wang,Hengzhong Fan,Yongsheng Zhang
In response to the urgent demand for wide-temperature-range self-lubricating ceramics in demanding service environments, ZrO 2 -Ag-SrSO 4 composites with tailored Ag distributions were fabricated by oscillatory pressure sintering. The effects of Ag distribution (interface, matrix, lubricant phase) on the microstructure and tribological performance were investigated from room temperature (RT) to 1000 ℃. The results demonstrate that Ag and SrSO 4 can be incorporated into the ZrO 2 matrix, affecting interfacial bonding and frictional performance.The composite exhibits a low friction coefficient of 0.209–0.242 and a wear rate of (0.175–1.541) × 10 −5 mm 3 /(N·m). This is mainly attributed to Ag migration at low temperatures, Ag-SrSO 4 lubrication at medium temperatures, and formation of a SrSO 4 -Ag-NiO x tribofilm at 1000 ℃, enabling stable wide-temperature self-lubrication and providing high-performance tribological ceramic design.
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Xiaoli Chen,Binxu Cai,Yi Cai,Yizhe Pan,Feng Xiao,Ye Xu,Jie Yin,Zuowei Ying,Zheng Li
Colored zirconia suspensions are difficult to process by stereolithography because coloring species absorb ultraviolet light and the ceramic particles introduce additional scattering. Here, pink, green, and blue 3Y-ZrO 2 suspensions were modified by replacing 0-20 vol% of the ceramic phase with SiO 2 while maintaining a constant total solids loading of 45 vol%. Increasing the SiO 2 content reduced the apparent optical attenuation near 355 nm, increased the cure depth and depth-sensitivity parameter, and lowered the critical exposure energy. Suspensions containing 15-20 vol% SiO 2 showed the most favorable photocuring response within the investigated range and enabled stable printing. The same compositional modification also influenced subsequent thermal evolution: SiO 2 reacted with ZrO 2 to form ZrSiO 4 , and the selected composites reached relative densities above 97%. The sintered specimens retained characteristic pink, green, and blue coloration, with only limited color differences between the 15 and 20 vol% compositions. Flexural strengths of 200-370 MPa and Vickers hardness values of 10-14 GPa were obtained. These results show that SiO 2 substitution can improve the printability of strongly attenuating colored zirconia suspensions while supporting densification during sintering, although ZrSiO 4 formation introduces a trade-off in mechanical performance.
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Wei Yang,Ping Xiong,Yinghong Wang,Tao Tao,Xuerui Liu,Xiaoling Xu,Caiyun Yang,Liming Yang,Huiji Xiao,Kai Zhang,Wei Zhang,Xubiao Luo
Membrane separation technology serves as an essential approach for the efficient and sustainable extraction of lithium from salt-lake brines, whose effectiveness crucially depends on the selective Li + /Mg 2+ separation performance. However, conventional nanofiltration (NF) membranes remain constrained by the trade-off between water permeability and ion selectivity. In this study, we proposed a two-step fabrication strategy that couples solution deposition with interfacial polymerization (IP), successfully constructing a positively charged Zr-His/PTF composite NF membrane with a thin selective layer and uniform pore size. Hydrated zirconia clusters (hydrous-ZrO 2 ) derived from inorganic zirconium salts were utilized to regulate the distribution of reaction sites via electrostatic anchoring, while the amphipathic structure of histidine was employed to restrict the diffusion of aqueous monomers. These two components synergistically modulated the IP process, enabling the precise regulation of the selective layer microstructure while significantly reducing organic reagent consumption. Under a high Mg 2+ /Li + mass ratio of 30:1, the modified membrane achieved a synchronous enhancement in Li + /Mg 2+ separation selectivity (29.57) and water permeance (21.7 L·m −2 ·h −1 , 6 bar). Moreover, the membrane maintained stable separation performance and structural integrity across a wide Mg 2+ /Li + mass ratio range (1:1 to 100:1) and throughout 100 h of continuous operation. Through the integration of fabrication methods, this study provides a straightforward, low-cost and environmentally friendly strategy for fabricating high-performance NF membranes.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）