Deqiao Xie

Nanjing University of Aeronautics and Astronautics

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Lida Shen

Nanjing University of Aeronautics and Astronautics

Zongjun Tian

Nanjing University of Aeronautics and Astronautics

Jianfeng Zhao

Southeast University

Huixin Liang

Fujian Medical University

Youwen Yang

Jiangxi University of Science and Technology

Changjiang Wang

First Hospital of China Medical University

Chen Jiao

Nanjing University of Aeronautics and Astronautics

Fei Lv

Xi'an Jiaotong University

Kai Zhou

Nanjing University of Aeronautics and Astronautics

Syed Mesum Raza Naqvi

Nanjing University of Aeronautics and Astronautics

Cooperative Institutions

Nanjing University of Aeronautics and Astronautics

Chinese Academy of Sciences

Sichuan University

Central South University

University of Chinese Academy of Sciences

Harbin Institute of Technology

Shanghai Jiao Tong University

Tsinghua University

University of Electronic Science and Technology of China

Jiangxi University of Science and Technology

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Laser Additive Manufacturing of Zinc Targeting for Biomedical Application

International Journal of Bioprinting (2022)

Yan Zhou Jingwen Wang Youwen Yang Mingli Yang Haizhong Zheng

Biodegradable zinc (Zn) is expected to be used in clinical application like bone tissue engineering scaffolds, since it possesses favorable biocompatibility and suitable degradation rate. Laser powder bed fusion (LPBF), which is a typical additive manufacturing technique, offers tremendous advantages in fabricating medical devices with personalized geometric shape and complex porous structure. Therefore, the combination of LPBF and biodegradable Zn has gained intensive attention and also achieved rapid development in recent years. However, it severely challenges the formation quality and resultant performance of LPBF-processed Zn-based materials, due to the evaporation and element loss during laser processing. In this study, the current research status and future research trends for LPBF of Zn-based implants are reviewed from comprehensive viewpoints including formation quality, microstructure feature, and performance. The influences of powder characteristics and process parameters on formation quality are described systematically. The microstructure evolution, mechanical properties, as well as the degradation behavior are also discussed. Finally, the research perspectives for LPBF of Zn are summarized, aiming to provide guideline for future study.

Biocompatibility

Degradation

10.18063/ijb.v8i1.501

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Citations (23)

Strength Enhancement of Laser Powder Bed Fusion 316L by Addition of Nano TiC Particles

Materials (2024)

Yanyan Liu Deqiao Xie Fei Lv

316L stainless steel is widely used in various industrial fields, but its strength is relatively low. The improvement of its strength has become a research hotspot. In this study, nano titanium carbide (TiC) particles are ball milled with 316L with the addition of 2 wt% and 4 wt%. The composite powder was then used for the fabrication of samples by laser powder bed fusion. The results show that the TiC is uniformly distributed in the microstructure. With the addition of TiC, the average size of the grains is significantly reduced. The strength, hardness, and wear resistance of TiC/316L samples have been greatly improved. The tensile strength of formed 2 wt% TiC/316L is 948 MPa, together with a extension rate of 36.0%, which has been increased by 42.6% and 79.7%, respectively. This study provides an effective way to improve the strength at room temperature and the high temperature of 316L built by laser powder bed fusion.

Titanium carbide

10.3390/ma17051129

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Sintering densification mechanism and mechanical properties of the 3D-printed high-melting-point-difference magnesium oxide/calcium phosphate composite bio-ceramic scaffold

Journal of the mechanical behavior of biomedical materials/Journal of mechanical behavior of biomedical materials (2023)

Mengxing Ge Deqiao Xie Youwen Yang Zongjun Tian

Magnesium phosphate

10.1016/j.jmbbm.2023.105978

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Citations (2)

Intelligent Geometry Compensation for Laser Powder Bed Fusion by Machine Learning Derived from Optical Scanning Data

SSRN Electronic Journal (2022)

Zifan Zhang Deqiao Xie Lida Shen Zongjun Tian Fei Lv

Recently, laser powder bed fusion (LPBF) has shown great potential in advanced manufacturing. However, the rapid melting and re-solidification of the molten pool in LPBF leads to the distortion of parts, especially thin-walled parts. The traditional geometric compensation method, which is used to overcome this problem, is simply based on mapping compensation, with the general effect of distortion reduction. In this study, we used a genetic algorithm (GA) and backpropagation (BP) network to optimize the geometric compensation of Ti6Al4V thin-walled parts fabricated by LPBF. The GA-BP network method can generate free-form thin-walled structures with enhanced geometric freedom for compensation. For the GA-BP network training, an arc thin-walled structure was designed and printed by LBPF and measured via 3D scanning measurements, resulting in point cloud data sets of more than 470,000 data points. The final distortion of the compensated arc thin-walled part based on GA-BP was reduced by 72.7%, which is better than the compensation method based on BP and mapping. The effectiveness of this GA-BP compensation method is further evaluated in an application case using new data points, and the result shows that the final distortion of the oral maxillary stent was reduced by 71%. In summary, the GA-BP-based geometric compensation proposed in this study can better reduce the distortion of thin-walled parts with higher time and cost efficiencies.

Sensor Fusion

Laser Scanning

10.2139/ssrn.4140213

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Construction of Irregular Low-Density Parity-Check Codes Based on V-Matrix

Deqiao Xie Jun Wang Wen Yu Shaoqian Li

Traditional irregular low-density parity-check (IR-LDPC) codes are constructed based on the irregular bipartite graphs with carefully chosen degree patterns on both sides and computer searching is usually applied, which leads complexity to be relatively high. In this paper, we introduce the concept of V-matrix which is a matrix composed of vectors and propose a new approach to construct the IR-LDPC codes. By introducing some special operations, we can obtain the desired sparse parity-check matrix for IR-LDPC codes design. Because computer searching is avoided, the complexity is efficiently reduced. Computer simulation results show that our approach can achieve good tradeoff between complexity and performance

Parity-check matrix

Matrix (chemical analysis)

Parity (physics)

Parity bit

10.1109/pimrc.2005.1651908

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Length dependence of the resonant magnetoelectric effect in Ni/Pb(Zr,Ti)O 3 /Ni long cylindrical composites

Journal of Alloys and Compounds (2014)

Deqiao Xie Y.G. Wang J. H. Cheng

Magnetoelectric effect

Deposition

10.1016/j.jallcom.2014.06.208

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Citations (14)

Effect of Melt Morphology on Pore Defects For Ti-6al-4v Fabricated by High Powder Thickness in Selective Laser Melting

An Zhang Deqiao Xie Hao Li Zhidong Liu Zongjun Tian

Selective Laser Melting

Morphology

Titanium alloy

10.2139/ssrn.4968038

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Mg bone implant: Features, developments and perspectives

Materials & Design (2019)

Youwen Yang Chongxian He E Dianyu Wenjing Yang Fangwei Qi

Mg and its alloys have been identified as promising bone implant materials owing to their natural degradability, good biocompatibility and favorable mechanical properties. Nevertheless, the too fast degradation rate usually results in a premature disintegration of mechanical integrity and local hydrogen accumulation, which limit their clinical bone repair application. In this work, the current research status regarding Mg bone implants was systematically reviewed. The relevant strategies to enhance the corrosion resistance, including purification, alloying treatment, surface coating and Mg-based metal matrix composite, are comprehensively discussed. The fabricating techniques for Mg bone implants are also presented. Particularly, laser additive manufacturing can fabricate customized shape and complex porous structure basing on its unique additive manufacturing concept. More importantly, it can achieve rapid heating and cooling due to the characteristics of high laser energy density and good controllability, thereby regulating the microstructure and performance. Furthermore, the current challenges and future research perspectives are put forward. This work aims to offer some meaningful guidelines for researchers on the future study of Mg bone implants.

Biocompatibility

10.1016/j.matdes.2019.108259

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Citations (357)

Effect of Melt Morphology on Pore Defects for Ti-Based Alloys Fabricated by Multi Thickness in Selective Laser Melting

An Zhang Deqiao Xie Hao Li Zhidong Liu Zongjun Tian

Selective Laser Melting

Morphology

10.2139/ssrn.5096727

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Citations (0)

Additive manufacturing of hydroxyapatite bone scaffolds via digital light processing and in vitro compatibility