CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yiru Shen,Ying Sun,Bocheng Jin,Ming Li,Bohang Xing,Zhe Zhao
With no extra assistance of CIP or HIP, YAG transparent ceramics were successfully fabricated by digital light processing (DLP) stereolithography method followed by careful debinding and vacuum sintering. We systematically studied the effect of heating rate, atmosphere during debinding and the heating rate, holding time during sintering on the light transmittance of YAG ceramics. All results indicated that debinding in the 95N 2 /5H 2 mixture is the key controlling factor for achieving better densification and optical properties , regardless of the sintering profile. However, a lower heating rate can indeed promote the densification process and balance some shortcomings linked with the debinding in air. At least, three different debinding processes and three different sintering profiles are combined, which leads to a high in-line transmittance of ∽77%.
研究领域:
材料科学
·
光学工程
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DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2025
·Vol. 32
·期 5
·1220-1233
·
IF 7.2
Qin Qing,Xiong Gang,Han Lin,Zhang Yujuan,Shen Zhen,Ge Changchun
Digital light processing (DLP) is a crucial additive manufacturing (AM) technique for producing high-precision ceramic components. This study aims to optimize the formulation of Si 3 N 4 slurry to enhance both its performance and manufacturability in the DLP process, and investigate key factors such as particle size distribution, photopolymer resin monomer ratios, and dispersant types to improve the slurry’s rheological properties. Through these optimizations, a photosensitive Si 3 N 4 slurry with 50vol% solid content was developed, exhibiting excellent stability, and low viscosity (2.48 Pa·s at a shear rate of 12.8 s −1 ). The effects of gas-pressure sintering on the material’s phase composition, microstructure, and mechanical properties were further explored, revealing that this technique significantly increases the flexural strength of the green sample from (109 ± 10.24) to (618 ± 42.15) MPa. The sintered ceramics exhibited high hardness ((16.59 ± 0.05) GPa) and improved fracture toughness ((4.45 ± 0.03) MPa·m 1/2 ). Crack trajectory analysis revealed that crack deflection, crack bridging, and the pull-out of rod-like β-Si 3 N 4 grains, are the main toughening mechanisms, which could effectively mitigate crack propagation. Among these mechanisms, crack deflection and bridging were particularly influential, significantly enhancing the fracture toughness of the Si 3 N 4 matrix. Overall, this research highlights how monomer formulation and gas-pressure sintering strengthen the performance of Si 3 N 4 slurry in the DLP three-dimensional printing technique. This work is expected to provide new insights for fabricating complex Si 3 N 4 ceramic components with superior mechanical properties.
研究领域:
材料科学
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陶瓷制造
·
增材制造
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Hairenisha Maotuerdi,Haojie Yao,Lanlan Dong,Houfeng Jiang,Ayiguli Kasimu,Patiguli Aihemaiti,Wurikaixi Aiyiti,Cijun Shuai
As clinical demand for enhanced osseous repair implants continues to increase, ceramic-based composites have attracted widespread attention owing to their superior mechanical properties and excellent biocompatibility. Hydroxyapatite (HA), although an ideal biocompatible matrix material, is limited by insufficient mechanical strength and the absence of piezoelectric activity, restricting its application in load-bearing bone repair. To address these limitations, digital light processing (DLP) 3D printing technology was used in this study to fabricate piezoelectrically active hydroxyapatite–barium titanate (HA–BT) nanocomposite scaffolds. A systematic investigation was conducted to examine the phase composition, microstructure, mechanical performance, piezoelectric properties, dielectric behavior, corrosion resistance, and biocompatibility of HA–BT specimens with varying ratios. The results demonstrated that, compared to pure HA, the 60 wt% BT composite scaffold exhibited significantly enhanced properties, including a compressive strength of 106.67 MPa (a 194 % increase over that of pure HA), a density of 91.43 %, a piezoelectric constant d 33 of 6.34 pC/N, a dielectric constant ε r of 93.6, and a corrosion current density of 7.1779 × 10 −5 A/cm 2 . In addition, the scaffold exhibited favorable cellular proliferation. The key performance metrics of this composite closely matched those of human bone, providing valuable insights into the design and fabrication of high-precision, high-performance artificial bone-repair constructs.
研究领域:
生物材料学
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组织工程
·
骨修复
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先进制造
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Virtual and Physical Prototyping
·
2024
·
IF 10.2
Wang Guo,Ping Li,Yanting Wei,Lei Zhao,Yuanheng Pang,Yanjian Huang,Xiaotong Ye,Shan Wang,Bin Liu,Hui You,Yu Long
Hydroxyapatite (HA) is widely used in bone scaffold development, but still faces problems of forming difficulty, slow degradation, and limited biological performance. In this study, triply periodic minimal surface (TPMS) porous HA scaffolds were prepared using desktop-level DLP and then doped with bredigite (BR) to enhance their performance through ion substitution to adjust microstructure. The DLP-prepared scaffolds displayed intricate curved surface porous structure, and their micro-porosity decreased while grain size increased with sintering holding time. During sintering, Mg2+ from BR substituted Ca2+ in HA, forming new secondary phases, which slightly decreased grain size while significantly increased micro-porosity. These factors slightly reduced mechanical properties while significantly enhanced degradation. The rapid release of inorganic active ions from BR and new phases enhanced the biomineralization and cell response. This study demonstrated the potential of using desktop-level DLP to construct complex porous ceramic scaffolds and using ion substitution to modulate their microstructure and performance.
研究领域:
生物材料学
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骨组织工程
·
3D打印技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Dawei Guan,Xianwen Wang,Xiaoyan Chen,Yaozhong Zhang,He Li,Qingxiao Yu,Fei Li
Silica ceramic cores are widely used for forming the inner cavity in hollow turbine blade casting. While the employment of 3D printing brings complex shapes and high production efficiency of ceramic cores, the clear downside of poor properties hinders their practical applications in comparison with traditional ones. This work aims to improve the comprehensive performance of 3D-printed silica ceramic cores, where the proposed powder gradation design leads to silica ceramic cores with high porosity, low shrinkage, and excellent high-temperature flexural strength. DLP-based 3D printing was utilized for ceramic core fabrication here. The studies on the powder shape and size reveal the merits of spherical particles on the flow and irregular particles on the stationarity of ceramic slurry. The sintering process suggests that coarse powder provides sufficient porosity for the core, while medium and fine powder enhance the densification degree of the core. As a result, when the mass ratio of coarse, medium, and fine powders was 1:1:2 and sintered at 1200 ℃, the comprehensive performance of the ceramic core was significantly improved, with a high open porosity of 30 %, reduced shrinkage rate to 1.2 %, surface roughness Ra reduced to 1.25 μm, and the high-temperature flexural strength increased to 39 MPa. This study will provide theoretical guidance and data support for 3D-printed silica ceramic cores.
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2025
·
IF 2.3
Yang Liu,Ruixue Sun,Jianmin Han
Calcium silicate (CaSiO 3 , CS) bioceramic has received widespread attention in the field of bone repair due to its excellent bone conductivity, osteoinductivtiy, and degradability. In this study, the porous CS scaffold was firstly prepared by digital light processing (DLP) 3D printing. The effects of solid loading, pore size, and sintering temperature on the compressive strength, porosity and shrinkage of the CS scaffold were thoroughly investigated. When the solid loading is 35 vol.%, the pore size is 500 µm, and the sintering temperature is 1200°C, the prepared CS scaffold has high porosity (48.96 %) and high compressive strength (32.13 MPa). To solve the problems caused by the rapid degradation of CS, surface modification of the prepared CS scaffold was further conducted through in situ growth of hydroxyapatite (HAp) on its surface. A large amount of HAp nanorods homogeneously grow on the surface of the CS porous scaffold when the concentration of KH 2 PO 4 in hydrothermal solution is 0.01 mol/L. Moreover, the phase composition and morphology of HAp grown on the surface of the CS scaffold can be controlled through controlling the concentration of KH 2 PO 4 .
研究领域:
生物材料学
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骨修复研究
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
BIOMACROMOLECULES
·
2024
·
IF 5.5
Ping Song,Xingyu Gui,Lina Wu,Xinyu Su,Wenzheng Zhou,Zeyu Luo,Boqing Zhang,Pin Feng,Wei Wei,Chen Fan,Yunhong Wu,Weinan Zeng,Changchun Zhou,Yujiang Fan,Zongke Zhou
Severe bone defects resulting from trauma and diseases remain a persistent clinical challenge. In this study, a hierarchical biomimetic microporous hydrogel composite scaffold was constructed by mimicking the hierarchical structure of bone. Initially, gelatin methacrylamide (GelMA) and methacrylic anhydride silk fibroin (SilMA) were synthesized, and GelMA/SilMA inks with suitable rheological and mechanical properties were prepared. Biomimetic micropores were then generated by using an aqueous two-phase emulsification method. Subsequently, biomimetic microporous GelMA/SilMA was mixed with hydroxyapatite (HAp) to prepare biomimetic microporous GelMA/SilMA/HAp ink. Hierarchical biomimetic microporous GelMA/SilMA/HAp (M-GSH) scaffolds were then fabricated through digital light processing (DLP) 3D printing. Finally, in vitro experiments were conducted to investigate cell adhesion, proliferation, and inward migration as well as osteogenic differentiation and vascular regeneration effects. In vivo experiments indicated that the biomimetic microporous scaffold significantly promoted tissue integration and bone regeneration after 12 weeks of implantation, achieving 42.39% bone volume fraction regeneration. In summary, this hierarchical biomimetic microporous scaffold provides a promising strategy for the repair and treatment of bone defects.
研究领域:
生物医学工程
·
组织工程
·
再生医学
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产品关联
DOI
PubMed
高影响因子
Materials Horizons
·
2022
·Vol. 10
·期 1
·179-186
·
IF 15.717
Zhuo Sun,Qian Zhao,Sainan Ma,Jingjun Wu
Porous hydrogels have been intensively used in energy conversion and storage, catalysis, separation, and biomedical applications. Controlling the porosity of these materials over multiple length scales brings about new functionalities and higher efficiency but is a challenge using the current manufacturing methods. Herein we developed a post-programming method to lock the lyophilized pores of 3D printed hydrogels as an experimental platform towards hierarchically structured pores. 3D printing endows the hydrogels with arbitrary 3D geometries and controllable pores at the millimeter length scale. Lyophilization and ionic crosslinking of the as-printed hydrogel networks are conducted as a post-programming process which results in pores at micrometer length scales beyond the printing resolution. Utilizing this combined manufacturing technology, 3D hydrogel lattices with tunable porosities and mechanical properties can be created, which are further exploited for efficient solar vapor generation.
研究领域:
材料科学
·
3D打印
·
纳米技术
·
能源转换与存储
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 22
·50525
·
IF 3.125
Songyi Li,Yihua Cui,Jingjing Li
In order to lower the volume shrinkage of the DLP 3D printing photosensitive resins during printing, a thiol-terminated hyperbranched polymer (T-HBP) was synthesized and introduced into the bisphenol A epoxy acrylate (EA) based photosensitive resin system. The obtained T-HBP was characterized by FTIR and 1 H NMR spectra, and the grafting rate of sulfhydryl was determined. The mechanical properties of the photosensitive resins were measured by tensile and impact strength measurement. The glass transition temperature of the photosensitive resins was analyzed by DSC and the impact fracture surface was observed by SEM. T-HBP exhibited a much lower viscosity than its linear counterparts, and the addition of thiol improved the curing speed of the photosensitive resins. When the amount of T-HBP added was 20 wt%, the shrinkage of the photosensitive resins was reduced by about 45.5% and the impact strength increased by 33.9% compared with the control. The macromolecular spherical structure of T-HBP effectively reduced the functional group density of the photosensitive resins. In addition, the thiol-acrylate photopolymerization introduced by T-HBP further reduced the volume shrinkage of the photosensitive resins.
研究领域:
材料科学
·
高分子化学
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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
·
先进制造
·
陶瓷工程
·
生物医学材料
·
增材制造
✓ 已验证
DOI
高影响因子
Journal of the Australian Ceramic Society
·
2022
·Vol. 58
·期 3
·1015-1023
·
IF 1.741
Jiaqi Luo,Bing Liu,Weijiu Huang,Bitao Liu,Dongyu Bai
In the research of digital light processing (DLP)-based ceramic three-dimensional printing technology, one of the key steps is to prepare proper slurry. Zirconia slurries were made of near-spherical zirconia powder and self-designed ultraviolet (UV) light curing resin system by the introduction of different dispersants in this paper. The effect of the dispersant types and concentrations on the rheological properties and stabilities of the slurries were investigated by means of rotary rheometer, scanning electron microscope (SEM), and Fourier transform infrared spectroscopy (FT-IR). The results show that the dispersants Oleic acid (OA), sodium polyacrylate (PAA-Na), ammonium polyacrylate (PAA-NH 4 ) and ammonium citrate (AC) can be successfully coated on the surface of zirconia particles and are beneficial to disperse these particles and prevent them from aggregating. But OA has the best effect to improve the rheological property and stability, and the effect varies with its concentration, and the best of it is 0.5 wt%. And, the slurry can be cured by UV light with the wavelength of 405 nm through the mechanism of the cracking and polymerization of unsaturated C = C in the resin by initiating the mechanism of photoinitiator.
研究领域:
材料科学
·
增材制造
·
陶瓷加工
·
流变学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yiwen Wu,Xinyi Pan,Bo Sun,Haiyan Li,Qing Yao
Due to the high-speed rotation and strong light exposure of digital light processing (DLP) projectors, the traditional polymer color wheel is at risk of deformation and color fading. Therefore, phosphor in glass (PiG) color filters will become a more heat-resistant alternative. In this work, we developed a single-step Isobam gel casting strategy that simultaneously forms green body with orange-red, green and transparent regions within a single mold, which avoided the need for subsequent stacking or gluing. In addition, the density of the green body was also increased by optimizing the solid content of the slurry. To suppress macroscopic defects that occur during molding, we first optimized the casting and demolding processes, obtaining green bodies with complete shapes and clear interfaces. Then the sintering system was optimized, and the following sintering system was finally determined. The temperature rises slowly from room temperature to 800 °C at a rate of 1 °C/min, and then cools along with the furnace chamber. During the cooling stage, residual stress is effectively released through slow temperature reduction, ensuring that the sample remains intact and free of cracks, and achieving defect control during forming stage.
研究领域:
材料科学
·
光学工程
·
无机非金属材料
·
先进制造
✓ 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）