Article
Materials Science, Multidisciplinary
Bowen Shi, Tao Li, Dong Wang, Xiaorui Zhang, Hongchao Zhang
Summary: This study investigates crack behavior and prevention of Ni60A coating by coaxial laser cladding. It found that nonuniform hard Cr-rich precipitates and large residual tensile stress are the main reasons for cracking, and thermal stress models were established to effectively reduce crack formation. Preheating the substrate can significantly decrease cracking rate, and a crack-free coating with higher microhardness can be achieved by adjusting process parameters.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Optics
Sha Wu, Zenghua Liu, Yu Gong, Xiubing Liang, Yufeng Wu, Xin Zhao
Summary: A 3D transient finite element model based on a sequentially coupled thermal-mechanical analysis is developed to simulate the temperature field, stress field, and cladding geometry evolution of the Ni60A-25% WC laser cladding composite coating. The influence of laser process parameters on the temperature field, stress field, and cladding dimensions is investigated. The simulation results show that the laser power, scanning speed, and heat source model have significant effects on the cladding quality.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Engineering, Chemical
Yudong Fang, Xuemei Chen
Summary: The effect of nano-La2O3 and Mo on the wear resistance of laser cladding coating was investigated. It was found that the Mo-La2O3-Ni60a/SiC composite coating exhibited the best wear resistance. The addition of nano-Mo and La2O3 improved the toughness and compactness of the coating, resulting in a refined microstructure. The wear mechanism of the coating mainly involved adhesive wear, abrasive wear, and oxidation wear.
Article
Materials Science, Multidisciplinary
Xu Huang, Jinyu Yu, Jibin Jiang, Guofu Lian, Changrong Chen, Mengning Zhou, Weiqi Xu, Xinxin Hu
Summary: The aim of this study is to solve the problems of cracking and porosity of laser cladding Ni60A/WC high-hardness composite coatings. Ta powder was added to synthesize TaC in situ with C in a molten pool, reducing the carbon content of the metal matrix and inhibiting the generation of carbon oxide gases. The results showed that adding an appropriate amount of Ta powder inhibited the formation of other carbides and carbon oxide gases, reducing the cracking sensitivity of the cladding layer and refining the grains.
Article
Materials Science, Ceramics
Xuehui Shen, Xiangping He, Liying Gao, Guosheng Su, Chonghai Xu, Nan Xu
Summary: The cracking behavior and crack formation mechanism of high WC wt% composite coatings were investigated. With increasing WC wt%, more cracks occurred in the coatings. The cracking of 50%WC coating was attributed to high tensile residual stress coupled with low toughness, while the higher crack susceptibility of 60%WC coating was mainly because of further increased residual stress.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Sha Wu, Zenghua Liu, Xiaofei Huang, Yufeng Wu, Yu Gong
Summary: In this research work, the preset powder feeding laser cladding process of Ni60A-25% tungsten carbide powder was optimized using response surface methodology. The microhardness of the laser cladding layer was significantly increased compared with the substrate, and the mathematical models for the dilution and unit effective area were successfully validated. The EBSD analysis showed a pronounced meritocratic orientation in the laser cladding layer.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Chemistry, Analytical
Yuxu Zhu, Houming Zhou, Zixin Chen, Zeda Wang, Fangjia He, Caixing Xu
Summary: Using alternating magnetic field-assisted laser cladding, Ni60A/WC composite coating is prepared on a 45 steel substrate. The distribution of WC particles is significantly homogenized, leading to improved microhardness and wear resistance of the coating.
Article
Optics
Bowen Shi, Tao Li, Zhiwei Guo, Xiaorui Zhang, Hongchao Zhang
Summary: In this study, a crack-free Ni60A coating was successfully obtained by selecting suitable process parameters. It was found that a high line energy and low powder feed rate can prevent cracking, but result in low microhardness. Further research showed that a combination of preheating and adding an insulating plate can improve the microhardness of the crack-free coating.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Optics
Yameng Shi, Jingbin Li, Jie Zhang, Baoqin Wen, Liqiao Li, Xianfei Wang, Sixue Ren
Summary: This study investigated the influence of rare-earth La2O3 content on the wear resistance of a laser clad coating. The results showed that the coating with 2 wt% La2O3 added exhibited the best comprehensive properties, with refined coating grain, increased density, uniform distribution of coating elements, and new hard phases formed. The wear surface coating experienced an oxidation reaction, with a friction coefficient and wear depth lower than those of the matrix material.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Thermodynamics
Gong Yuling, Wu Meiping, Miao Xiaojin, Cui Chen
Summary: CeO2/Ni60A composite coatings were prepared on TC4 titanium alloy surface by laser cladding technology, and the appropriate addition of CeO2 powder improved the wear resistance performance of the coating.
ADVANCES IN MECHANICAL ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Liangxiao Nian, Miaohui Wang, Xueyuan Ge, Xin Wang, Yifei Xu
Summary: In order to improve cladding coating quality and prevent cracking, this paper developed a thermo-mechanical coupling simulation model for extreme high-speed laser cladding. Process parameters were investigated to understand their impact on the coating morphology. Numerical calculations and temperature field simulations were conducted to validate the influence of temperature gradient and cooling rate on coating structure and residual stress distribution. The results showed that optimal coating quality could be achieved with specific laser power, cladding rate, and powder feeding rate. The microstructure and residual stress of the coatings were affected by the temperature gradient and cooling rate.
Article
Materials Science, Multidisciplinary
Rongyao Li, Aixin Feng, Jian Zhao, Xiaoming Pan, Guangsheng Zhang, Yunhu Zhu, Chunlun Chen
Summary: By studying the effects of process parameters on the quality of laser cladding coatings, the optimal preparation process for WC-Ni60A cermet composite coatings was determined using the Taguchi-grey relational method. The coating prepared with the optimal process parameters showed superior overall performance compared to other coatings, thus confirming the feasibility of the Taguchi-grey relational method.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Zhuanni Gao, Leilei Wang, Yanni Wang, Feiyue Lyu, Xiaohong Zhan
Summary: This study explores the application of laser cladding technology to fabricate a high entropy alloy coating on TC4 titanium alloy and investigates the influence of powder layer thickness and process parameters on stress field through finite element modeling. The study also examines the effect of stress on cracks and evaluates the factors affecting crack rate. Empirical-statistical correlations between key processing parameters and crack rate are proposed. The results provide valuable insights into crack control and properties improvement of high entropy alloy coatings in laser cladding.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Bowen Shi, Xiaokai Mu, Huan Zhan, Linhui Deng, Tao Li, Hongchao Zhang
Summary: This study investigates the influence of substrate tilt angle on the crack behavior of high hardness Ni60A coating in laser cladding. The cracking rate of the coating increases with increasing substrate tilt angle, but the tilt angle does not significantly affect the crack mechanism. Different lap directions have an impact on crack behavior, and coatings prepared by downward lap cladding have a higher cracking rate due to greater laser energy loss. The increasing substrate tilt angle leads to increased residual stress and decreased fracture strength, resulting in a higher cracking rate of the Ni60A coating.
Article
Optics
Qi Zhang, Peng Xu, Gangqiang Zha, Zhi Ouyang, Detao He
Summary: The study simulated the cladding process of Fe-Mn-Si-Cr-Ni shape memory alloy coating using ANSYS software. The results showed that the shape of the molten pool in single-track cladding was half-scoop, reaching a peak temperature of 2600 degrees Celsius in multi-track cladding, and the stress distribution exhibited tensile-compression-tensile.
Article
Optics
Zhi-Huan Pang, Meng Liu, Ai-Ping Luo, Yi Xu, Wen-Cheng Xu, Songnian Fu, Zhi-Chao Luo
Summary: We propose a novel mode-dependent gain equalizer using a few-mode chirped fiber Bragg grating (FM-CFBG) to effectively mitigate the mode-dependent gain in an all-fiber 2-mode EDFA. The equalizer based on FM-CFBG offers compact size, low insertion loss, and wavelength scalability, making it meaningful for long-haul MDM transmission.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Yiwei Qiu, Chenliang Ding, Gangyao Zhan, Mengdi Luo, Jisen Wen, Mengbo Tang, Chun Cao, Wenjie Liu, Liang Xu, Bihu Lv, Dazhao Zhu, Cuifang Kuang, Xu Liu
Summary: This article proposes a novel method to simultaneously reduce the axial and lateral feature sizes of PPI-DLW. By employing a pseudo 3D hollow focus, a suspended nanowire with an isotropic 30-nm feature size was realized, thereby improving the capabilities of PPI-DLW for fabricating arbitrary 3D structures.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Manzhuo Wang, Jianbo Yue, Zhentao Yao, Tingyu Liu, Xiaoqiang Sun, Yuanda Wu, Daming Zhang
Summary: A silica waveguide 1×8 thermo-optic switch consisting of cascaded three-stage Mach-Zehnder interferometers (MZIs) is successfully demonstrated. The switch utilizes a multimode interference (MMI) coupler in the MMI-MZI 1×2 switch unit for its wavelength insensitivity and favorable fabrication tolerance. The switch design and optimization is based on the beam propagation method (BPM) and implemented using standard CMOS technologies. Experimental results show that the switch meets the requirements for insertion loss and crosstalk at 1550 nm wavelength, and also performs well in a wide wavelength range.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
H. M. de la Cruz, E. D. Hernandez-Campos, E. Ortiz-Ricardo, A. Martinez-Borquez, I. Rosas-Roman, V. Contreras, G. Ramos-Ortiz, B. Mendoza-Santoyo, Cecilia I. Zurita-Lopez, R. Castro-Beltran
Summary: Acoustic levitation is an important contactless manipulation technique in various fields. This study presents an affordable phased-array levitator that can stably trap micrometer dye-doped droplets in the air, enabling the creation of microlasers. The levitated microlasers exhibit comparable optical lasing features to On-a-Chip devices, with a maximum Q-factor of approximately 105 and a minimum lasing threshold of approximately 150 nJ cm-2.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Yuqi Wang, Zilong Zhang, Suyi Zhao, Wei He, Xiaotian Li, Xin Wang, Yuchen Jie, Changming Zhao
Summary: This paper investigates the impact of localized defects in SLM devices on structured light generation and demonstrates the reconstructed light field results under different defect states using CGH loaded onto the DMD. The results show that central defects have minimal influence on the reconstructed light field, while edge defects have a significant impact. This study expands the application scenarios for the generation of structured light beams with SLM.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Ashraf A. A. Beshr, Hossam El-Din Fawzy, Ehab A. A. Eldin, Jong Wan Hu, Fathi A. Abdelmgeed
Summary: This paper introduces the application of digital measuring techniques, specifically Digital Close Range Photogrammetry (DCRP), in the detection of deformation in post-tensioned structural elements (PTSEs). The use of digital equipment and a terrestrial laser scanner (TLS) allows for highly accurate monitoring of PTSE camber, with deviations not exceeding 0.01 mm.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Shihao Gou, Danping Huang, Shipeng Liao, Fan Luo, Yang Yuan, Liang Liu, Xiaomei Wen
Summary: This paper proposes an online intelligent detection method for cable pitch defects in the field of optical cable manufacturing. The method utilizes a multi-sensor fusion image acquisition platform and deep learning technology to achieve accurate detection of pitch defects in optical cables.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Tun-Yao Hung, David W. U. Chan, Ching-Wei Peng, Chi-Wai Chow, Hon Ki Tsang
Summary: We present the first experimental demonstration of a high-capacity short-reach optical communication link which utilizes LSTM and DNN to achieve 300 Gbit/s 8-level pulse amplitude modulation (PAM8) generated by a single microring modulator. The experimental results show that 300 Gbit/s and 270 Gbit/s PAM8 modulation can be achieved at back-to-back and after 1 km transmission respectively.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Long Zhang, Li Pei, Jianshuai Wang, Jingjing Zheng, Kaihua Hu, Zhiqi Li, Tigang Ning, Jing Li, Li Zhong, Ruisi He
Summary: The amplification of long-haul mode division multiplexing (MDM) transmission systems is currently achieved through three steps, which can result in complexity and degraded transmission performance. To address this issue, this paper proposes an in-line few-mode erbium-doped fiber amplifier (FM-EDFA) based on cladding pumping, which enables simultaneous amplification and transmission in MDM systems. Experimental results demonstrate that the in-line FM-EDFA has excellent performance and shows great potential for practical long-haul transmission systems.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Chong Wang, Miaomiao Li, Jiahao Yang, Bingli Zhu, Jianghao Han, Wenbin Dang
Summary: This paper introduces the design of drive circuits using step recovery diodes and RF bipolar transistors to produce narrow pulse lasers, achieving the reduction of system size, power consumption and cost.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Ziqian Zhang, Liangyu Zhao, Chaorun Si, Yang Tian, Shilin Xu
Summary: A Hastelloy C276 coating was prepared on a martensitic stainless-steel substrate using laser melting deposition, resulting in a coating with high resistance to cavitation erosion. The coating exhibited a thick, progressively changing grain morphology from bottom to top, and the grains grew in a specific angle to the substrate plane. A compositional mixing zone was formed at the interface, forming a stable metallurgical bond. The coating showed a significantly improved hardness and enhanced resistance to cavitation erosion compared to the substrate.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Cui-Hong Li, Chao-Xiong He, Yuan-Yuan Ma, Jin-Chuan Wang, Ying Dong, Shao-Chong Zhu, Xiao-Wen Gao, Hui-Zhu Hu
Summary: In this paper, a non-contact optical measuring method for characterizing nanoparticles using optical tweezers is presented. The method relies on the optical polarization and scattering of nanoparticles, providing insights into both shape and size parameters. Experimental results show that the method can accurately measure the shape and size of nanoparticles, making it an effective tool for identifying and studying individual nanoparticles.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Magdalena Zieba, Cuma Tyszkiewicz, Katarzyna Wojtasik, Krystian Pavlov, Pawel Chaber, Ewa Gondek, Jacek Niziol, Roman Rogozinski, Pawel Kielan, Pawel Karasinski
Summary: This work presents a study on low-loss waveguide layers for planar evanescent wave sensor applications. Crack-free SiOx:TiOy composite layers with refractive indices of approximately 1.65 were fabricated using a sol-gel method and dip-coating technique. The fabricated layers exhibited good waveguide properties and optical homogeneity.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Yali He, Jiao Tang, Zhongyang Li, Yaowu Hu
Summary: In this paper, a lithography-free broadband absorbing metasurface consisting of Ag nanoparticles with ultrafine nanogaps is demonstrated. The experimental results and numerical simulations show that the horizontally compressed Ag nanoparticles possess smaller nanogaps for high sensitivity, uniformity, and stability. The novel substrate also exhibits insensitivity to the incident or observation angle in an ambient environment and has promising practical applications.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Linqing Li, Chengwei Yang, Zhuo Wang, Kun Xiao, Rui Min
Summary: In this study, a stretchable polymer optical fiber with a sandwich structure was proposed for sleep monitoring. The fiber improved the pressure sensitivity of the mattress and enabled the measurement of respiratory rate, heart rate, and body motion information.
OPTICS AND LASER TECHNOLOGY
(2024)