COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
·
IF 8.7
Lei Liang,Xianxian Sun,Yuanhao Ning,Shasha Wang,Weilong Yin,Yibin Li
The process of toughening brittle ceramics is challenging but important for broadening their range of applications. Extensive studies on toughening brittle alumina (Al 2 O 3 ) ceramics at room temperature have been conducted; however, significantly increasing their toughness at high temperatures remains a challenge. Here, we propose the use of two-dimensional Ti 3 C 2 T x MXene ceramics with high thermal stability to effectively toughen Al 2 O 3 ceramics at high temperatures via a nacre-like structure strategy. The fracture toughness (K Jc ) of the as-prepared MXene/Al 2 O 3 nanocomposite at 1000 °C is 6.02 MPa m 1/2 , 2.4 times that of pure Al 2 O 3 (2.51 MPa m 1/2 ). Moreover, it maintains relatively high strength at 1000 °C (∼193 MPa). The toughening mechanisms - crack deflection, bifurcation and bridging effects - are obtained via in situ observation of crack propagation and finite element simulation. Our novel strategy provides a universal solution to improve the toughness of brittle ceramics at high temperatures and in some special environments.
研究领域:
材料科学
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陶瓷工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Junjie Lu,Dong Wang,Keqiang Zhang,Suwen Li,Bin Zhang,Xueqin Zhang,Lu Zhang,Wenqing Wang,Ying Li,Rujie He
To obtain both plasticity and toughness of the material at the same time, various manufacturing techniques of ceramic-metal composites and structures have been studied. In this work, a bio-inspired Al 2 O 3 ceramic scaffold with Gyroid structure was designed and prepared by stereolithographic (SL) additive manufacturing , then the Al 2 O 3 /Al ceramic-metal hybrid structure was prepared by infiltrating molten Al into the Al 2 O 3 ceramic structure. The performances of the Al 2 O 3 ceramic scaffold and the Al 2 O 3 /Al ceramic-metal hybrid structure were compared and analyzed by a quasi-static compression experiment. The quasi-static compressive strength of the pristine Al 2 O 3 scaffold was 14.36 MPa, while that of the Al 2 O 3 /Al ceramic-metal hybrid structure was up to 89.06 MPa. Moreover, the plasticity of the Al 2 O 3 /Al ceramic-metal hybrid structure was much higher than that of the Al 2 O 3 scaffold. During compression, the Al 2 O 3 /Al ceramic-metal hybrid structure had excellent energy absorption, reaching up to 2569.16 KJ/m³, 15 times that of the Al 2 O 3 scaffold. Therefore, this method can obtain materials with excellent ductility and toughness.
研究领域:
材料科学
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制造工程
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产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
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2023
·Vol. 20
·期 5
·2737-2746
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IF 2.1
Zhaoping Hou,Xinhe Yang,Zihan Tian,Liangliang Liu
Porous Al 2 O 3 ceramic beads with a small-scale lamellar pore structure were prepared by the dripping-ice templating method. The densification behavior of lamellar walls and the attrition resistance of porous Al 2 O 3 beads were investigated. For the two-dimensional structural lamellar walls, the intrinsic pores shrunk, and the necking area grew during the sintering process, leading to the densification of lamellar walls and the shrinking of porous beads. In addition, the two-dimensional lamellar walls and three-dimensional Al 2 O 3 bulk are compared and possibilities of elaborating of the discrepancy in grain size and pore morphology are discussed. Attrition resistance was determined by a grinding test. The dominant attrition mechanism of porous Al 2 O 3 beads is abrasion. High sintering temperature led to a decrease in the attrition rate due to a wider necking area and denser pore walls.
研究领域:
材料科学
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陶瓷工程
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Ruitong Chi,Zhuowei Zhou,Zhixiao Zhang,Haiping Zhao,Yu Dong,Yafeng Wang,Yusen He,Yanming Wang,Xiaorong Zhang
In this study, a novel closed spherical-shell-shaped toughening phase morphology is purposely constructed within Al 2 O 3 ceramics. The continuous Al 2 O 3 matrix is segregated by the TiC x O y N z spherical shells, with both the interior and exterior of each shell maintaining the Al 2 O 3 phase. Such spherical shells with the thickness of approximately 150 nm are comprised of submicron-sized TiC x O y N z grains in stack. Accordingly, such hierarchical microstructure gives rise to a multidimensional crack propagation mode in which cracks repeatedly expand along the external and internal interfaces of TiC x O y N z spherical shell and Al 2 O 3 ceramic matrix on a microscaled level, as well as across TiC x O y N z grain interfaces within the shell layer on a submicron scale. This synergistic action significantly increases crack propagation resistance through continuous energy dissipation at multiple length scales. Consequently, the Al 2 O 3 -TiC x O y N z composite ceramic achieves a remarkable fracture toughness of 6.47 ± 0.21 MPa m 1/2 . This work provides a novel strategy for designing high-performance Al 2 O 3 ceramics through engineered toughening phase morphology.
研究领域:
材料科学
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陶瓷工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2022
·
IF 6.364
Shenglin Kang,Xuetong Zhao,Jing Guo,Jie Liang,Jianjie Sun,Yang Yang,Lijun Yang,Ruijin Liao,Clive A. Randall
Thermal-assisted cold sintering process (TA-CSP) has been applied to fabricate high dense α-Al 2 O 3 ceramics with submicron grain sizes. The α-Al 2 O 3 (80 wt%) and γ-Al 2 O 3 (20 wt%) powders are firstly mixed and then cold sintered at 300 °C to produce a green bulk with a relatively high density of ∼ 86.9 %, and then later a second heat treatment (800–1350 °C) is applied to finally fabricate (∼ 98 % dense) α-Al 2 O 3 ceramics with grain sizes of 720 nm. A microstructural analysis with XRD and TEM suggests that the TA-CSP samples not only complete the final densification but also drive a phase transition of γ-Al 2 O 3 to α-Al 2 O 3 . To put into perspective the Hardness and Young's modulus of TA-CSP samples reach ∼ 14 GPa and ∼ 335 GPa, respectively, which is comparable to conventional sintered samples processed at higher temperatures of 1500–1700 °C. Therefore, it is feasible to utilize TA-CSP to prepare α-Al 2 O 3 ceramics with small grain sizes at low sintering temperatures .
研究领域:
材料科学
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陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2021
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IF 4.094
Xiao Guo,Haibo Wang,Rui Tian,Haojiang Yin,Yunfeng Qiu,Feng Wang
Hydrophobic α-Al 2 O 3 ceramic membrane (HCM) offers excellent mechanical properties , corrosion resistance , and high-temperature resistance. Application of HCM in the membrane distillation (MD) process could expand the application scope of MD equipment and greatly lengthen the replacement cycle of the membrane. Here a prediction model of the contact angle of HCM was constructed by physical-chemical combined modification method, orthogonal method, and stepwise linear regression method to optimize the preparation process of HCM. The surface morphology , contact angle, and surface functional groups of HCM were characterized. In this work, we polished the surface of the α-Al 2 O 3 ceramic membrane with 400 mesh sandpaper to copy the optimal morphology and found that the effect of grafting time on the contact angle of HCM could be abandoned. The optimal levels of drying temperature, drying time, and grafting solution concentration were 250 °C, 65.5 min, and 0.019 mol/L, respectively. The contact angle of HCM was 145.3° corresponding to the optimal preparation process. The significance of the prediction model of the contact angle of HCM was better than 0.05, and all of the prediction errors were less than 5%. This work has an important guiding value for exploiting the optimum hydrophobic property of HCM.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2023
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IF 5.7
Hongming Fu,Kaili Xue,Jihao Yang,Zhaohao Li,Heng Zhang,Dan Gao,Haiping Chen
In this paper, Al 2 O 3 ceramic membrane is modified to hydrophobicity by grafting 1 H,1 H,2 H,2 H-perfluorodecyltriethoxysilane. And its properties are characterized in detail. CO 2 capture performance of ceramic membrane is investigated by experiments. Results show that wetting resistance after modification is significantly improved, and contact angle increases from the initial 49.8–130.9°. However, hydrophobic modification has no significant effect on the crystalline phase, surface morphology and pore size distribution of the ceramic membrane. With ethanolamine (MEA) as absorbent, CO 2 mass transfer rate and capture efficiency using modified hydrophobic ceramic membrane are 46.6 × 10 −3 mol/(m 2 ·s) and 98.0%, showing significantly increase compared to the original membrane. After 72 h immersion in MEA solution, quality of ceramic membrane does not change significantly. And there is almost no change in average pore size. We believe this study will provide a reference for the industrial application for CO 2 capture by gas-liquid membrane contactor with ceramic membrane.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yangli Xu,Zeling Yang,Guoqin Huang,Chenxu Ren,Guangyao Han,Xiaopeng Jiang,Tingting Li,Congming Ke,Yong Zeng,Xipeng Xu
Al 2 O 3 ceramic have excellent chemical inertness, superior heat resistance, and excellent corrosion resistance, so they are considered ideal materials for manufacturing high-performance components such as thermal end devices in aerospace, heat dissipation panels in electronic communication, and exhaust filters in the automotive industry. Digital Light Processing (DLP) is a useful technology to fabricate complex Al 2 O 3 ceramic components. However, the size shrinkage effect of DLP-fabricated components need to be investigated deeply before its further application. In this work, we utilized DLP technology to fabricate Al 2 O 3 ceramic honeycomb structures and systematically investigated their microstructure, size shrinkage, and mechanical properties. Our findings revealed that the Al 2 O 3 ceramic grains exhibit flake-like structures with an average diameter of 1–2 μm, and the ceramic particles are tightly bonded. The shrinkage rates in the X and Y axes were 7.54 % and 7.42 %, respectively, while the Z-axis exhibited a more significant shrinkage of 13.04 %. This anisotropic shrinkage in different direction was attributed to accumulation of the interlayer bonding under gravity action during debinding and sintering process. The compressive stress-strain curve of the honeycomb structures demonstrated a typical brittle compressive behavior, including elastic, stress plateau, and brittle fracture stages. The honeycomb structures exhibited an elastic modulus of 54.49 ± 1.22 MPa and a compressive strength of 10.22 ± 0.42 MPa. The fracture analysis indicated that the fractures region of honeycomb structures initiated at the corners of the honeycomb structures, indicating their easy-broken compared to the walls. These findings provide valuable guidance for the high-precision and high-performance manufacturing of complex Al 2 O 3 ceramic components.
研究领域:
材料科学
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制造工程
✓ 已验证
产品关联
DOI
高影响因子
JOM
·
2025
·
IF 2.3
Wang Ya-Long,Yang Xiao-Hui,Zhang Guo-Hua
A simple and effective method is proposed for producing polycrystalline La 1- x Ce x B 6 (LaB 6 , La 0.75 Ce 0.25 B 6 , La 0.5 Ce 0.5 B 6 , La 0.25 Ce 0.75 B 6 , and CeB 6 )-Al 2 O 3 ceramics. La 1- x Ce x B 6 solid-solution powders were first prepared by the reaction between lanthanum oxides, cerium oxides, boron carbide, and aluminum powders at 1573 K, during which a trace amount of Al 2 O 3 (1–3 wt.%) was inevitably introduced. Subsequently, highly dense (> 98.5%) La 1- x Ce x B 6 -Al 2 O 3 ceramics were produced using spark plasma sintering (SPS) technology at 1850°C, and the results revealed that the existence of Al 2 O 3 can enhance the mechanical properties of La 1- x Ce x B 6 by pinning the grain boundaries and refining the grains. Among the samples, the La 0.5 Ce 0.5 B 6 -Al 2 O 3 composition exhibited the most excellent mechanical properties, which were 22.8 GPa, 4.14 MPa m 1/2 , and 271 MPa for the Vickers hardness, fracture toughness, and flexural strength, respectively. Moreover, compared to the polycrystalline LaB 6 and CeB 6 bulks, the work functions of La 1- x Ce x B 6 bulks were lower, and the presence of Al 2 O 3 had a slight influence on the work function of La 1- x Ce x B 6 .
研究领域:
材料科学
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陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
Science China-Technological Sciences
·
2021
·Vol. 64
·期 6
·1264-1275
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IF 3.572
Liu XiongZhang,Luo Hui,Li YinRui,Chen Fu,Liu JieLing,Yang WenTao,Wang Xian,Gong RongZhou
TiB 2 /Al 2 O 3 ceramics reinforced with MgO are prepared by spark plasma sintering (SPS). The dielectric and microwave (MW) absorption properties are discussed. The results indicate that both the commercial TiB 2 (C-TiB 2 ) content and preparing temperature play important roles in the dielectric properties. Simultaneously, TiB 2 /Al 2 O 3 composite shows the best MW absorption property when the C-TiB 2 content and preparing temperature are 9 wt% and 1400°C. To further improve the MW absorption properties, the composite containing 9 wt% synthesized TiB 2 (S-TiB 2 ) has been sintered at 1400°C. Its high-temperature complex permittivity is greater than that of TiB 2 /Al 2 O 3 composite with 9 wt% C-TiB 2 sintered at 1400°C and is directly proportional to the temperature. Besides, TiB 2 /Al 2 O 3 composite with 9 wt% S-TiB 2 possesses a better MW absorption at 25–500°C, its effective absorption bandwidth ( RL <−5 dB) can reach 4.2 GHz at 25–500°C. And the minimum reflection loss ( RL min ) value reaches −43.41 dB at the temperature of 800°C with a thickness of 1.45 mm for TiB 2 /Al 2 O 3 composite with 9 wt% C-TiB 2 . Consequently, the satisfying absorbing layer ( d <1.75 mm), flexural strength, heat stability and considerable high-temperature MW absorption ability grant TiB 2 /Al 2 O 3 ceramics practical applications as high-temperature microwave absorption materials (MAMs).
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Manufacturing Processes
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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
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Qibao Yang,Shaobai Sang,Yawei Li,Tianbin Zhu,Heng Wang
The development of highly oxidation-protective and stable coatings is crucial for significantly reducing the oxidation of 06Ni9DR alloy steels during heating before hot rolling, thereby enabling the products with superior surface quality. In this study, three types of coatings—Al 2 O 3 -glass coating, a 10 wt% NiO-90 wt% Al 2 O 3 ceramic coating, and a double-layer coating Al 2 O 3 -glass top layer and NiO-Al 2 O 3 ceramic bottom layer)—were prepared, and their oxidation protection and underlying mechanisms were systematically investigated. The results revealed that the oxidation protection ratio of the glass coating sharply decreased from 96.6 % for 10 min to 44.9 % for 180 min at 1200 °C. In contrast, the oxidation protection of the ceramic coating increased slightly with the oxidation time. Notably, the excellent oxidation protection ratio of the double-layer coating was obtained as 86.2 % for 180 min. The rapid densification of the Al 2 O 3 -glass layer in the double-layer design provided good oxidation protection and significantly reduced the formation of iron oxides in the initial oxidation stage; NiO-Al 2 O 3 ceramic layer reacted with Fe 2+ to form a relatively dense composite spinel barrier layer, which further improved the thermal stability of the Al 2 O 3 -glass layer, and greatly enhanced the oxidation protection and stability of the double-layer coating.
研究领域:
材料科学
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冶金学
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表面工程
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陶瓷材料
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高温氧化
✓ 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）