Defence Technology
·
2023
·
IF 5.1
Weitao Yang,Yuchen Gao,Rui Hu,Manman Li,Fengqi Zhao,He Jiang,Xuan Zhang
Smart materials, which exhibit shape memory behavior in response to external stimuli, have shown great potential for use in biomedical applications. In this study, an energetic composite was fabricated using a UV-assisted DIW 3D printing technique and a shape memory material (SMP) as the binder. This composite has the ability to reduce the impact of external factors and adjust gun propellant combustion behavior. The composition and 3D printing process were delineated, while the internal structure and shape memory performance of the composite material were studied. The energetic SMP composite exhibits an angle of reversal of 18 s at 70°, with a maximum elongation typically reaching up to 280% of the original length and a recovery length of approximately 105% during ten cycles. Additionally, thermal decomposition and combustion behavior were also demonstrated for the energetic SMP composite.
研究领域:
材料科学
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高分子化学
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推进剂技术
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智能响应材料
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增材制造
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·Vol. 44
·期 3
·3412-3416
·
IF 2.986
Rongxuan He,Wei Liu,Ziwei Wu,Di An,Meipeng Huang,Haidong Wu,Qiangguo Jiang,Xuanrong Ji,Shanghua Wu,Zhipeng Xie
In this work, a stereolithography-based method of 3D printing was successfully used to fabricate a complex-shaped triangular zirconia cutting tool with a tool withdrawal groove and a honeycomb ceramic component. The sintered bodies displayed significant shrinkage after sintering, with the maximum shrinkage being 35.26%. The XRD pattern indicated that the crystalline phase of the parts was the t-ZrO 2 phase, while SEM characterization revealed that the sintered bodies were composed of densely packed submicron-grade grains, without any discernible pores. The density of the parts was measured as 97.14% via Archimedes’ water displacement method, which is consistent with the results of SEM characterization. Additionally, the measured Vickers hardness and fracture toughness of the fabricated parts were 13.0597 GPa and 6.0380 MPa m 1/2 , respectively. These values are close to the structural properties of common zirconia ceramics prepared by conventional approaches. Hence, a novel DLP-stereolithography-based 3D printing process for the fabrication of complex and dense zirconia ceramic parts has been proposed in this work.
研究领域:
材料科学
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先进制造
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陶瓷工程
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生物医学材料
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增材制造
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2021
·
IF 9.676
Yu Liu,Shuanghao Zheng,Jiaxin Ma,Yuanyuan Zhu,Jiemin Wang,Xinliang Feng,Zhong-Shuai Wu
With the rapid development of integrated and miniaturized electronics, the planar energy storage devices with high capacitance and energy density are in enormous demand. Hence, the advanced manufacture and fast fabrication of microscale planar energy units are of great significance. Herein, we develop aqueous planar micro-supercapacitors (MSCs) with ultrahigh areal capacitance and energy density via an efficient all-3D-printing strategy, which can directly extrude the active material ink and gel electrolyte onto the substrate to prepare electrochemical energy storage devices. Both the printed active carbon/exfoliated graphene (AC/EG) electrode ink and electrolyte gel are highly processable with outstanding conductivity (~97 S cm −1 of electrode; ~34.8 mS cm −1 of electrolyte), thus benefiting the corresponding shaping and electrochemical performances. Furthermore, the 3D-printed symmetric MSCs can be operated stably at a high voltage up to 2.0 V in water-in-salt gel electrolyte, displaying ultrahigh areal capacitance of 2381 mF cm −2 and exceptional energy density of 331 μWh cm −2 , superior to previous printed micro energy units. In addition, we can further tailor the integrated 3D-printed MSCs in parallel and series with various voltage and current outputs, enabling metal-free interconnection. Therefore, our all-3D-printed MSCs place a great potential in developing high-power micro-electronics fabrication and integration.
研究领域:
储能技术
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材料科学
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电化学
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微电子学
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增材制造
✓ 已验证
DOI
高影响因子
Additive Manufacturing
·
2021
·
IF 10.998
Chengbin Yue,Miao Li,Yingtao Liu,Yiqun Fang,Yongming Song,Min Xu,Jian Li
The combination of shape memory polymer composites and 3D printing technology provides novel opportunities for customized manufacturing and intelligentization of products. Here, we developed magneto-responsive shape memory polymer composites with well-balanced strengths and toughness by adding Fe 3 O 4 and cellulose nanofibers (CNFs) to a poly-hydroxybutyrate/poly(ε-caprolactone) blend as functional particles and reinforcing component. The influences of Fe 3 O 4 and CNFs on the properties including micromorphology, and rheological, melting-crystallizational, thermomechanical, static mechanical, and magneto-responsive shape-memory behaviors were investigated. The results displayed that the PHB/PCL (80:20) composites with 10 wt% Fe 3 O 4 and 0.5 wt% CNFs had the optimal comprehensive mechanical and magneto-responsive shape-memory properties. Moreover, 3D printing tests found that the addition of CNFs and printing parameters were crucial for the mechanical and magneto-responsive shape-memory properties of the resulting products. Finally, the fabrication of a scaffold with excellent load-carrying performance and a magneto-responsive self-recovery snowflake demonstrated the application feasibility of our work.
研究领域:
材料科学
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聚合物复合材料
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增材制造
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智能材料
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纳米复合材料
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2022
·
IF 4.331
Yaoyao Jiang,Xu Dong,Qi Wang,Shengping Dai,Lvzhou Li,Ningyi Yuan,Jianning Ding
Three-dimensional (3D) structural actuators based on monodomain liquid crystal elastomers (mLCEs) show a wide range of potential applications. A direct ink writing technique has been developed to print LCE structures. It is still a challenge to print high-precision 3D-mLCE actuators. Here, a method of wet 3D printing combined with freeze-drying is proposed. The coagulation bath is designed to restrain the nascent fiber disturbance of the capillary wave and weight by adjusting the ink viscosity and printing speed to control the LC molecular order, enabling uniform (B = 1.02) fibers with a high degree of orientational alignment (S = 0.45) of the mesogens. Furthermore, dynamic disulfide bond formation was used as the cross-linking point, which can allow the LCE network structure to be continuously cured to ensure adjacent layers are effectively bonded and, in combination with freeze-drying, produce the 3D-mLCE actuators of fidelity architecture (98.37 vol %) by printing. The actuators have excellent actuating strain (45.12%), and the dynamic disulfide bond makes them programmable. Finally, a printed bionic starfish and a printed bionic hand can easily grab regular and irregular objects. This work provides a feasible scheme for fabricating complex 3D-mLCEs with reversible changes in shape.
研究领域:
材料科学
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软体机器人
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高分子工程
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智能材料
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增材制造
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·Vol. 46
·期 16
·25802-25807
·
IF 3.83
Jun Xiao,Yan Jia,Dongqing Liu,Haifeng Cheng
Manufacturing complexity and poor machinability hinder the preparation of complex-shaped ceramic composites. Three-dimensional printing can overcome this difficulty. Herein, we report a type of photocurable preceramic resin containing SiO 2 nanoparticles (up to 20 wt% of polymer), which do not affect the photocurability of the preceramic resin, and a small amount of SiC nanofibres (1 wt%). We successfully printed precise green bodies with a complex shape by digital light processing and converted them into ceramic composites via pyrolysis at 1300 °C under a N 2 atmosphere. The introduction of SiO 2 and SiC into the ceramic composites led to reduced weight loss of the composites during pyrolysis and a decrease in their porosity and enhancement in their mechanical properties after pyrolysis. The properties of the printed samples pyrolysed at different ramping rates were compared, and the effects of the microstructure on the mechanical properties of the composites were investigated.
研究领域:
材料科学
·
陶瓷工程
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增材制造
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高分子转化陶瓷
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复合材料
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2020
·
IF 4.652
Yingnan Shi,Zheng Lu,Li Yu,Rui Xie,Yuhang Ren,Guang Yang
Oxide dispersion strengthened (ODS) FeCrAl alloys have been considered as the promising candidate fuel cladding materials for the Gen-IV fission reactors due to excellent radiation tolerance, mechanical properties and corrosion resistance , but their manufacturing is complex process. Laser engineered net shaped (LENS) technology followed by post-build heat treatment was employed successfully to fabricate Zr-containing ODS-FeCrAl alloy. The microstructure of as-deposited and heat-treated alloys was characterized by optical microscope (OM), electron backscatter diffraction (EBSD), scanning electron microscope (SEM) and high-resolution transmission electron microscope (HRTEM). The tensile tests were carried out at room temperature. The results show that the coarse columnar grains with preferred orientation ([001] fibre texture) are obtained after LENS deposit and are remained after post-build heat treatment. The average width of columnar grains for both as-deposited and heat-treated samples is ~180–190 μm. A slag-like layer which is made up of Y 3 Al 5 O 12 , ZrO 2 and Al 2 O 3 is observed at the surface of deposited sample. Some coarse appendage oxides which consist of Al 2 O 3 and Y 4 Zr 3 O 12 are distributed in the matrix of as-deposited sample. Post-build heat treatment produces high-density nanoscale Y 4 Zr 3 O 12 oxides in the matrix. The formation mechanism of different type oxides is explained. Both as-deposited and heat-treated samples present anisotropic tensile properties . After post-build heat treatment, the tensile strength is improved significantly by the formation of high-density nanoscale Y 4 Zr 3 O 12 .
研究领域:
材料科学
·
增材制造
·
核材料
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金相学
·
力学性能
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）