CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yunzhu Ma,Haotian Liu,Chaozhong Wu,Wensheng Liu,Juan Wang,Shuwei Yao
The preparation of high-performance Al 2 O 3 -ZrO 2 fibers is a significant and challenging task. In this study, continuous Al 2 O 3 -ZrO 2 fibers were synthesized via the sol-gel method using aluminum powder and zirconium acetate as raw materials. It was observed that the amorphous state of Al 2 O 3 transformed into γ-Al 2 O 3 and then to α-Al 2 O 3 , while the amorphous ZrO 2 directly transformed into t-ZrO 2 . The formation temperatures of t-ZrO 2 and α-Al 2 O 3 were both approximately 1100 °C. The optimal sintering temperature during the single-step sintering process for Al 2 O 3 -ZrO 2 fibers was 1400 °C. Based on the experiment results, fully dense Al 2 O 3 -ZrO 2 fibers with fine grains were successfully synthesized via a two-step sintering process. The average sizes of Al 2 O 3 and ZrO 2 grains were 153 nm and 62 nm, respectively. The Weibull strength of the Al 2 O 3 -ZrO 2 fibers reached 2.2 GPa with a peak value of 2.6 GPa, which exhibited an increase of approximately 30% compared to that formed by the single-step sintering process. Furthermore, the nucleation, growth, and densification behaviors of Al 2 O 3 -ZrO 2 fibers during the two-step sintering process were discussed.
研究领域:
材料科学
·
陶瓷学
·
纤维科学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2020
·
IF 4.495
Chen Jiao,Jiajun Gu,Ying Cao,Deqiao Xie,Huixin Liang,Ruoyu Chen,Tianshu Shi,Lida Shen,Changjiang Wang,Zongjun Tian,Xinyu Yi
Multi-level porous material based on additive manufacturing , is a potentially disruptive material across multiple industries, including medical implants , thermal insulation and filtration. In this study, we propose a novel approach to fabricate materials with controllable pores via digital light processing (DLP) and decomposition of Al(OH) 3 . DLP can be used to fabricate macro pores bigger than 300 μm. And the decomposition of Al(OH) 3 can result in micro pores of about 1 μm inside the scaffolds. The process parameters of curing, debinding and sintering temperature (1100−1500 ℃) of ceramic scaffolds with containing proportion of Al(OH) 3 (0−60 wt.%) were examined. The results indicated multi-level porous ceramic scaffold has controllable porosity and pore size distribution and meets the requirement of implant strength . Biological test show that ceramic scaffolds with multi-level pores promoted osteoblast proliferation and adhesion. The multi-level porous ceramic scaffolds prepared by DLP and decomposition of Al(OH) 3 have great prospects for the application in bone implants .
研究领域:
材料科学
·
生物医学工程
·
增材制造
·
陶瓷
·
组织工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Lin Wang,Chenfei Gao,Yuhang Jiang,Zepeng Xu,Han Wei,Kangkang Yuan,Xiaotong Jin
Structural evolution is essential for the fundamental understanding of high-temperature behavior and optimizing of ceramic micro/nanofibers. In the present work, the effects of structural evolution on the high temperature stability and flexibility of Al 2 O 3 -ZrO 2 -La 2 O 3 (AZLO) fibrous membranes were fully investigated. The evolution of precursor fiber pyrolysis, phase transformation and microstructure were characterized by TG/DSC, IR, XRD, SEM, ESB and HRTEM. From 800 to 1200°C, the dual-phasic structure of amorphous Al 2 O 3 and fine ZrO 2 and La 2 Zr 2 O 7 grain contributed to the thermal stability and flexibility of AZLO fibrous membranes. At 1300°C, solid-state metathesis reaction between amorphous Al 2 O 3 and intermediate phase La 2 Zr 2 O 7 led to the formation of fine LaAl 11 O 18 and ZrO 2 grain. The interlaced distribution of fine ZrO 2 particles and platelet-like LaAl 11 O 18 became the new fundament of thermal stability and flexibility of AZLO fibrous membranes. AZLO fibrous membranes could maintain its excellent high temperature stability and flexibility up to 1300°C and possessed a low room temperature thermal conductivity of 35.7 mW m −1 K −1 . The present work provided a novel perspective for the rational design of Al 2 O 3 -ZrO 2 fibers from the view of structural evolution.
✓ 已验证
产品关联
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
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Peng Shu,Yunzhu Ma,Wensheng Liu,Juan Wang,Shuwei Yao
Al 2 O 3 -ZrO 2 biphasic fibers were of considerable interest due to their superior mechanical properties and thermal stability. Despite this, precise control over fiber structure and further enhancement of thermal stability remained significant challenges. This study investigated the regulation of phase transformation behavior and thermal stability in Al 2 O 3 -ZrO 2 fibers through Sc 2 O 3 doping. The findings demonstrated that Sc 2 O 3 doping facilitated the formation of α-Al 2 O 3 and t-ZrO 2 phases within the fibers. In samples containing 1 wt.% Sc 2 O 3 , the average crystal size of α-Al 2 O 3 was 160 nm, while t-ZrO 2 crystals displayed a bimodal nanoscale distribution. The Weibull strength of these fibers reached 1.99 GPa. Following exposure to 1200 °C for 100 h, most α-Al 2 O 3 crystal sizes remained within the 200-300 nm range. The mechanism by which Sc 2 O 3 doping affects structural evolution and enhances the thermal stability of Al 2 O 3 -ZrO 2 fibers was also examined.
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2019
·Vol. 21
·期 3
·606-613
·
IF 9.405
Zhenbing Xie,Bingfeng Chen,Haoran Wu,Mingyang Liu,Huizhen Liu,Jianling Zhang,Guanying Yang,Buxing Han
Transformation of biomass or biomass-based feedstocks into fuels or valuable chemicals is of great importance for the sustainable development of our society. Mesoporous Al2O3–ZrO2 with different Al : Zr molar ratios was prepared by the sol–gel method, and Cu–Ni/Al2O3–ZrO2 catalysts were fabricated by the impregnation method. The catalytic performances of the bifunctional catalysts were studied in the selective hydrogenation of levulinic acid (LA) into 2-methyltetrahydrofuran (MTHF). It was demonstrated that both Cu : Ni and Al : Zr ratios affected the selectivity to MTHF significantly. The bimetallic catalysts Cu–Ni/Al2O3–ZrO2 containing 10 wt% Ni and 10 wt% Cu gave 99.8% MTHF selectivity at full conversion of LA when the Al : Zr ratio was 9 : 1. The outstanding catalytic performance of the catalyst is related to the mesoporous structure, the acidic properties of the support and the synergistic effect between Cu and Ni. The catalyst could be reused five times without a considerable loss of catalytic activity and selectivity.
研究领域:
化学工程
·
催化科学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2026
·Vol. 46
·期 10
·118292
·
IF 6.3
Yakun Wang,Yufei Zu,Guoqing Chen
Al 2 O 3 -ZrO 2 (Y 2 O 3 ) eutectic ceramics are promising high-temperature structural materials with excellent thermal stability and mechanical properties. Crystallographic orientation control is effective for tuning their performance. Herein, we investigated the crystallographic orientation rotation of Al 2 O 3 and ZrO 2 phases in the rod-like and lamellar micro-regions into the core of the colonies of Al 2 O 3 -ZrO 2 (Y 2 O 3 ) eutectic ceramics prepared by the seeding melt-grown method. Results show that ZrO 2 phases exhibit diverse growth directions with gradual rotation in both regions. However, Al 2 O 3 phases exhibit distinct rotational behaviors depending on the morphology: in lamellar regions, the crystallographic orientations of both Al 2 O 3 and ZrO 2 phases rotate synchronously, with the misorientation angle per unit length relative to an initial position reaching up to 2.09°·μm −1 ; in rod-like regions, the Al 2 O 3 phase shows negligible rotational displacement. Crystallographic orientational rotation behaviors were measured in these melt-grown eutectic ceramics, providing a research basis for the solidification of oxide eutectics.
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Liyu Chen,Jiaxin Yang,Yifan Zhang,Shaohua Wu,Youjian Yang,Wenju Tao,Jiangyu Yu,Zhaowen Wang
The electrochemical behavior of Zr(IV) on a molybdenum (Mo) electrode in a KF-AlF 3 -Al 2 O 3 -ZrO 2 molten salt system was studied using cyclic voltammetry (CV), square-wave voltammetry (SWV) and chronopotentiometry (CP). The reduction process of Zr(IV) was found to follow a two-step, two-electron transfer mechanism: Zr(IV)+2e − →Zr(II) and Zr(II)+2e − →Zr(0). The reduction process was quasi-reversible and controlled by diffusion. Al-Zr alloys were successfully obtained on Mo and liquid aluminum electrodes by potentiostatic electrodeposition . Flower-like AlZr 3 and irregular granular Al 3 Zr were obtained on the Mo electrode, which were mainly attributed to the electrochemical co-reduction of Al(III) and Zr(IV) in the molten salt. Three Al-Zr alloy phases, Al 3 Zr , Al 3 Zr 2, and Al 2 Zr, were obtained on the liquid aluminum electrode, among which Al 3 Zr was dominant in the product, followed by Al 3 Zr 2 .
研究领域:
材料科学
·
电化学
✓ 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）