CERAMICS INTERNATIONAL
·
2026
·
IF 6
Mingyang Zhao,Zhisen Feng,Yupeng Jiao,Xiao Chen,Linjue Xiao,Tao Hong,Zhenfeng Tong
Cr-substituted hollandite ceramics are promising crystalline waste forms for immobilizing radioactive cesium, yet achieving high densification is challenging within temperature windows that mitigate Cs loss. Here, we develop a practical, sintering-aid-assisted reactive sintering route to densify Ba 0.667 Cs 0.667 Cr 2 Ti 6 O 16 at relatively low temperature and to identify the key factors controlling densification. Nine commonly used sintering aids were screened individually, and CuO was found to be uniquely effective. Guided by this screening, we correlate thermal behavior, crystallographic evolution, and microstructural development to clarify the role of CuO. Thermal analysis shows that CuO shifts BaCO 3 -related mass-loss/endothermic events to a lower temperature, indicating earlier BaCO 3 decarbonation and CO 2 release. Rietveld refinement of the X-ray diffraction data further reveals systematic crystallographic evolution, consistent with limited Cu substitution and associated defect-compensation effects that may enhance mass transport. These effects coincide with a marked change in grain-growth behavior, where anisotropic growth is suppressed, and grains become more equiaxed, improving packing efficiency and enabling grain-growth-controlled densification. The resulting increase in relative density is accompanied by significantly reduced Cs release, indicating improved chemical durability. Overall, this work establishes CuO-enabled reactive sintering as a practical low-temperature processing strategy for refractory Cr-hollandite waste forms and highlights grain-growth control as a key microstructural mechanism linking processing, densification, and durability.
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高影响因子
POLYMER
·
2026
·
IF 5.1
Shang Peng,Zhaonan Wang,Ding Huang,Kangjie Zhou,Yong Liu,Fan Cheng,Hai Liu
Cellulose nanofiber (CNF) aerogels are promising sustainable porous materials, but their mechanically weak sheet-like networks and intrinsic flammability limit practical deployment under demanding conditions. Herein, we report a minimal-polymer interfacial densification strategy that uses only approximately 2 wt% aramid nanofibers (ANFs) to reinforce and fire-protect CNF aerogels. Through an in situ sol–gel–coating process, the ANF sol is converted into a compact interfacial coating on CNF sheets, yielding a hierarchical ANF–CNF–ANF sandwich skeleton that stabilizes weak inter-sheet junctions while preserving the ultralight porous structure. This optimized skeleton endows the aerogel with a compressive strength of 219 kPa and a modulus of 618 kPa, corresponding to 2.6- and 15-fold improvements over pristine CNF aerogel, respectively, while maintaining a low thermal conductivity of 37.1 mW m −1 K −1 . The ANF-modified aerogel also exhibits self-extinguishing behavior, an increased limiting oxygen index, and reduced heat and smoke release, demonstrating improved fire resistance. This study provides a facile minimal-polymer interfacial engineering route for developing mechanically robust, fire-safe, and thermally insulating bio-based aerogels.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Kun Liu,Yuan Wang,Dayong Ren,Wujie Dong,Hui Bi,Wei Zhao,Fuqiang Huang
Bioinspired design and manufacture based on sustainable raw materials is emerging as a promising way to develop high-performance lightweight structural materials. However, the bottom-up fabrication of bioinspired materials, involving the densification from dispersion systems of heterophase components through conventional evaporation methods, faces significant challenges due to high energy and time consumption. Here we demonstrate a simple and efficient method termed “capillarity-assisted densification” for the facile preparation of high-performance bioinspired structural materials. This versatile method, inspired by the wicking effect, effectively accelerates manufacturing efficiency while maintaining structural stability. The as-fabricated mineralized cellulose bulk structural materials exhibit high specific strength (146 MPa/(Mg m −3 )) and toughness (6.4 MPa m 1/2 /(Mg m −3 )), surpassing those of conventional polymer-based composites and various bioinspired composites. Furthermore, such a unique lightweight structural material bridges the gap between engineering ceramics and light alloys regarding the coefficient of thermal expansion and specific fracture toughness. We propose that green and robust mineralized cellulose bulk structural materials are promising for advanced lightweight structures, and that the capillarity-assisted densification could be easily adapted for various dispersion phases for practical bioinspired production.
研究领域:
材料科学
·
生物启发设计
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Ao Wang,Zhifeng Huang,Mingyong Jia,Xuye Wang,Qianshun Cui,Zhihao Wang,Qiang Shen,Fei Chen
Vat photopolymerization 3D printing of Si 3 N 4 ceramics enables complex geometries, but oxygen inhibition during photocuring induces incomplete resin polymerization. Additionally, although larger Si 3 N 4 particles improve curing depth, their sparse packing after debinding compromises sintering densification. In the present work, the oxygen reduction effect of potassium iodide was utilized to mitigate the influence of surface oxygen on resin curing. As a result, the curing depth was enhanced to 132 µm, surpassing the previously reported values of less than 90 µm. This advancement enabled the successful fabrication of complex Si 3 N 4 ceramic components with a single-layer thickness of 50 µm. Furthermore, Al(H 2 PO 4 ) 3 was incorporated as a binder, which decomposes during the debinding process to form A-type phosphate salts on the surface of the large-size (2.66 µm) Si 3 N 4 powders. These salts establish physical bonds among the powders, effectively reducing interparticle spacing and promoting densification. The present work synthesized Si 3 N 4 ceramics with a flexural strength of 304 MPa at a relatively low sintering temperature of 1700°C.
研究领域:
材料科学
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陶瓷工程
·
3D打印技术
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DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
You-Yong Wang,Yuan-Qing Li,Wei-Bin Zhu,Shao-Yun Fu
Bamboo is an abundant and fast-growing nature material, which has been used in furniture and buildings. Its strength and fire-resistance are two critical issues for its wide applications. Herein, a high-strength and flame-retardant structural bamboo is obtained by constructing a boron nitride (BN)/graphene oxide (GO) composite nanocoating on the surface of delignified and densified bamboo (D-bamboo), abbreviated as BN/GO@D-bamboo. The two-dimensional BN nanosheets can form a layered structure on the surface of bamboo, providing bamboo with thermal dissipation and physical barrier for significantly improving its fire resistance. As a result, compared with natural bamboo and D-bamboo, the ignition time of BN/GO@D-bamboo is prolonged by 67% and 49%, the maximum heat release rate and total heat release are reduced by 59% and 40%, respectively, the smoke generation is also significantly reduced, showing an excellent flame retardancy and smoke suppression. On the other hand, GO in the composite nanocoating can form hydrogen bonding with the cellulose of bamboo, which in turn endows the coating with strong adhesion (5 B grade). Consequently, the axial tensile strength, bending strength and radial compressive strength of the BN/GO@D-bamboo are significantly improved compared with natural bamboo. Given the excellent flame retardancy and mechanical robustness of BN/GO@D-bamboo, it is expected to be a new generation high-performance sustainable structural material.
研究领域:
材料科学
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纳米技术
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可持续材料
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消防安全工程
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2025
·
IF 14.3
Yugen Wang,Jianwei Li,Yuanyuan Zhong,Jiahao Kang,Bilin Zhang,Zhonglei Ma,Qiangli Zhao
The rapid development of modern 5G technology has significantly increased the demand for multifunctional electromagnetic interference (EMI) shielding and wave-absorbing materials. Hence, a densification strategy was proposed to fabricate multifunctional rigid polyimide (PI) composite foam. As a result, the composite PI foam exhibits excellent mechanical properties, with tensile and bending strengths of 4.7 and 21.1 MPa, respectively. Moreover, the composite PI foam achieves a promising EMI shielding performance with a high absorption coefficient ( A ) of 0.71, coupled with an X-band (8.2–12.4 GHz) EMI rating of 44 dB (2 mm) due to its high conductivity (20.29 ms/mm). Satisfyingly, the composite PI foam also has an optimal reflection loss (RL) of up to −46.4 dB and an effective absorption bandwidth (EAB) (RL < −10 dB) that covers the entire X-band. Meanwhile, the fabricated foam demonstrates a Joule heating performance of 89.2°C under supply voltages (3–9 V) and rapid response time (within 20 s) for stable and reproducible performance in long-term cycling. This work provides a versatile strategy for the development of lightweight and high-strength materials for EMI shielding and microwave absorption, demonstrating great potential for aerospace, microelectronics, and energy conversion applications.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Huilu Guo,Xiaojian Mao,Jian Zhang,Run Tian,Shiwei Wang
Attempts have been made to manufacture AlON transparent ceramics at low temperature using a new sintering aid system, Y 2 O 3 -La 2 O 3 -MnO. The sintering behaviors, including relative density and microstructure evolution of AlON ceramics doped with Y 2 O 3 -La 2 O 3 , MnO alone, and Y 2 O 3 -La 2 O 3 -MnO were compared. It was found that both the relative densities and grain sizes of samples doped with Y 2 O 3 -La 2 O 3 -MnO were much higher and larger than those of samples doped with Y 2 O 3 -La 2 O 3 or MnO alone, respectively. A liquid phase containing Al, O, N, Mn, and La formed at high temperature and played an important role on both eliminating pores and promoting grain growth of the sintered AlON bodies. Finally, translucent AlON ceramics were obtained through pressureless sintering at 1830 °C for 1 h, ~100 °C lower than those with conventional sintering aid Y 2 O 3 -La 2 O 3 . The ceramics doped with MnO showed green emission at 534 nm, under 445 nm excitation. We believe Y 2 O 3 -La 2 O 3 -MnO is a promising additive for the preparation of AlON transparent ceramic at lower temperature.
研究领域:
材料科学
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陶瓷工程
·
光学材料
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DOI
高影响因子
SCRIPTA MATERIALIA
·
2019
·
IF 4.539
Hui-Zhen Shen,Ning Guo,Liang Zhao,Ping Shen
High-density hydroxyapatite (HA) compacts were achieved by cold sintering of co-precipitated powders at temperatures lower than 200 °C without addition of any solvent. Critical factors affecting the densification behavior including the source of powders, the type of solvent, applied pressure, sintering temperature and time were investigated. The presence of lattice water together with ion substitution in the co-precipitated HA powders has a significant effect on the densification. A novel viewpoint that is essentially different from classical dissolution−precipitation mechanism in cold sintering was proposed; i.e., the formation of hydrogen bonds between the HA particles plays a critical role in the densification.
研究领域:
材料科学
·
生物医学工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Junfeng Nie,Jian Zhou,Xiaoguang Huang,Lin Wang,Guizhen Liu,Jiping Cheng
Hydroxyapatite (HAP) possesses excellent bioactivity/osteointegration properties. Nevertheless, its inferior flexural strength and fracture toughness limit its use in human weight-bearing parts. We investigated a microwave sintering technology which can be effectively used to develop titanium dioxide-hydroxyapatite (TiO 2 -HAP) ceramics with different amounts of TiO 2 (0.8,1.6,2.4,3.2,4.0,4.8,5.6 and 6.4 wt%), which contribute to extremely high flexural strength (90–130 MPa) along with a good combination of elastic modulus and fracture toughness. The results of the Rietveld refinement show that multiphase bioceramics (HAP, β-TCP) can be achieved by doping nano-TiO 2 under microwave sintering. Despite the fact that the main phases of the sintered TiO 2 -HAP ceramics are HAP and β-TCP, X-ray diffraction confirms the formation of the CaTiO 3 and CaTi 2 O 4 (OH) 2 phases. Furthermore, the sintering reactions to form these phases are discussed and the results show that an appropriate amount of nano-TiO 2 can not only effectively inhibit the growth of grain, but also change the fracture mode and increase the relative density. Finally, it is found that doping nano-TiO 2 by microwave heating is an effective technique for producing HAP/β-TCP composite load-bearing implants in clinical applications without coarsening the size of grain.
研究领域:
生物材料学
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医学工程
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高影响因子
JOURNAL OF POWER SOURCES
·
2013
·
IF 4.675
Yiqiu Li,Zheng Wang,Chilin Li,Yang Cao,Xiangxin Guo
High density (∼96%) garnet-type Al-contained Li 6.75 La 3 Zr 1.75 Ta 0.25 O 12 (LLZTO-Al) solid electrolytes are prepared by conventional solid-state reaction and the following flowing oxygen sintering process . An overall ionic conductivity as high as 7.4 × 10 −4 S cm −1 at 25 °C is achievable, remarkably higher than that obtained by sintering in other atmospheres. The dependence of density and conductivity of solid electrolytes on sintering under different oxygen partial pressures is discussed. Atmosphere sintering is proved to be an effective method to improve the relative density of lithium oxide ceramics .
研究领域:
材料科学
·
电化学
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 17
·14097-14107
·
IF 2.779
Ba Ruiqing,Ma Weibing,Hong Jingnan,He Xinghui,Li Jing,Yang Sen
This paper reports investigation on fabrication and densification of cerium hexaboride (CeB 6 ). CeB 6 powders were successfully synthesized from cerium oxide and boron carbide at 1500 °C in a vacuum. X-ray diffraction and XPS spectra were applied to detect and trace the variation of reactant during the general reaction, where CeO 2 consequently transformed into CeB 6 after the intermediate states such as Ce 2 O 3 and CeBO 3 . The whole process could be described as topo chemistry synthesis. The final state of cerium in CeB 6 contains Ce 3+ and Ce 4+ according to the peak split result of Ce 3d orbits. CeB 6 polycrystalline bulks of 98% relative density were prepared via hot pressing at 1900 °C under 40 MPa. The hardness and electrical resistivity of the dense CeB 6 reached 21.58 GPa and 4.6 × 10 − 5 Ω m, respectively.
研究领域:
材料科学
·
化学
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DOI
高影响因子
Journal of the Australian Ceramic Society
·
2023
·Vol. 59
·期 5
·1231-1239
·
IF 1.9
Zhang Mengwen,Jiang Binyang,Yang Lutong,Cao Na,Li Zhaosheng,Fan Lei,Yang Shoulei
The emerging oscillatory pressure sintering technology is used to prepare high-performance Al 2 O 3 -Ti(C,N) ceramic tools for high-speed cutting. By recording the displacement during sintering, the sintering shrinkage rate of the Al 2 O 3 -Ti(C,N) composite was calculated, and the stress exponent n and sintering activation energy Q were calculated according to creep theory to determine the densification mechanism. In addition, the evolution of phases, microstructure and hardness of the composite was also observed. Results show that during oscillatory pressure sintering process at 1400 °C and 1300 °C, the stress exponent of Al 2 O 3 -Ti(C,N) composite is around 2.2 and the sintering activation energy is 486 kJ mol −1 , indicating that the densification mechanism is a diffusion-controlled grain boundary sliding of Al 2 O 3 phase. Additionally, as the oscillatory pressure increases, the average grain size of the Al 2 O 3 decreases and the Vickers hardness increases. Hardness achieves the highest 22.7 GPa when the median oscillatory pressure is 70 MPa at 1400 °C, which is 1 GPa higher than that of static pressure of 70 MPa.
研究领域:
材料科学
·
机械工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）