Papers by Keyword: Laser Processing

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Authors: Ji Wei Fan, Xiao Peng Li, Zhao Jun Zhang, Wang Xi Zhang, Zhi Qiang Jiao, Rui Jie Zhang, Ying Liu, Zhen Guo Zhang
Abstract: Laser processing ceramic materials is a new application of laser technique. This paper presents the study of making cracked glaze surface by laser processing. Proposed the applicable the composition of glaze, the main processing parameters of laser processing, and discussed the factors which may affect the quality of cracked glazing surface. It indicates that laser processing could be a new and easy processing method to produce the cracked glazing on the ceramic surface.
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Authors: Kenshiro Nakashima, Yasuo Okuyama, Shinji Ando, Osamu Eryu, Koji Abe, H. Yokoi, T. Oshima
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Authors: Wen Hong Wu, Chun Li Chang, Chi Hung Hwang
Abstract: This The multi-mode fiber has been widely used in high data traffic applications since the transmitting rate of interface between data storages was larger than the capacity of fiber-optic communication with single mode fiber. The quality of end surface of fiber dominates the data transmitting efficiency. A good cutting end surface of single mode fiber can obtain by the traditional mechanical fiber cleaving methods. But, the multi-mode fiber has much larger core diameter than single mode fiber’s and the quality of cutting end surfaces which cut by the traditional mechanical fiber cleaving methods was not good enough. In the recent year, the pulse CO2 laser processing methods were introduced to cleave the fibers. In this research, a glass fiber laser cutting system was developed. The shapes of laser focusing spot and the concepts of laser cutting optical design were discussed in this paper. The experimental results show that the fiber cutting end surfaces with great quality, which were inspection by interferometer, can be obtained by the developed laser cutting system.
192
Authors: Feng Wang, Jian Jun Luo, Ming Li, Yue Deng
Abstract: To solve the difficulties of processing micro holes on the CMC-SiC, femtosecond laser was used as the drilling tool in this paper. And a new type of laser beam scanning module was studied. The study confirms the feasibility of finishing the processing of micro holes whose diameter is less than 2mm on the new CMC-SiC. And the preliminary optimization of processing parameters is completed. According to the experimental results, the important factors affecting the quality of the micro holes were analyzed, and the factors are the processing power and the scanning speed. The results also show that the femtosecond laser processing technology can solve the difficulties of drilling mirco holes on the new CMC-SiC in our countrys aerospace field.
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Authors: Akihiro Ikeda, Rikuho Sumina, Hiroshi Ikenoue, Tanemasa Asano
Abstract: Al doping of 4H-SiC with high surface concentration and deep depth profile is found to be realized by irradiating single-pulse excimer laser to an Al film deposited on the surface. Optical emission spectra suggest that high-temperature molten Al is produced behind the laser-generated high-density Al plasma and Al is diffused from the molten Al into 4H-SiC. The Al doping depth reaches to ~200 nm by irradiating a single laser pulse. A pn junction diode fabricated by the doping with the molten Al shows on/off ratio over 10 orders of magnitude.
527
Authors: Sung Jun Park, Jung Han Song, Geun An Lee
Abstract: New manufacturing process capable of high density patterns has been required. The most popular technique used today to form such fine pitch conductors is Semi-Additive Process(SAP) or variations of semi-additive process. New manufacturing method focus on the technologies designed to produce a smooth interface between resin and copper conductors for advantages in the high frequency application and fine conductor pitch capabilities. In this study, laser microprocessing was investigated for resin materials with various filler size, and was selected by suitable materials with processability and physical characteristics.
171
Authors: S.I. Yaresko
Abstract: The performed studies of the application features of the cutting tool, hardened by laser pulsed radiation are based on the comprehensive cutting process analysis. In this approach, the modeling results of the cutting process with hardened tool allowing to define the area of the effective use of laser treatment (LT). In particular, the increase in the tool life only for the certain values of the cut depth at the fixed irradiation energy was observed. The causes of the observed phenomena were determined based on durometric researches and studies of the microstructure in the contact zone. The measurements were performed for the cutters (steel R18) after turning structural steel 12Kh2N4A under various cutting modes. It was found that the processes of tool material softening, observed at turning with high feed values, limits the scope of cutting conditions by hardened tool. It is shown that LT leads to increased tool life, operating at the cutting conditions when the growth of tension thermodynamic in the cutting zone does not result in the development of softening processes. It is established that the area cutting modes are restricted to the values of cut depth not exceeding 1.5 mm (V=42.5 m/min, s=0.2 mm/rev) for the investigated pair of tool-workpiece (R18-12Kh2N4A). Tool life increases by more than 4 times compared to the durability of the non-irradiated tool provided the optimal combination of laser processing and hardened tool cutting modes is achieved.
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Authors: Shi Jian Yang, Zhen Jie Du, Hai Hong Kang
Abstract: The prototype of a production can be manufactured directly from its 3D CAD model data by using rapid prototyping technology, and can be renewed conveniently after modifying the CAD model. In this paper, the basic principle, typical prototyping systems are introduced, and rapid prototyping methods such as selected laser sintering of powder material, fused deposition modeling of threadlike material and laminated object manufacturing are presented. An application of rapid prototyping technology on design and development of first aid kit is described in detail. It is indicated that rapid prototyping technology is an effective means to lower the cost and shorten the period of development of medical equipment.
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Authors: Joerg Kaspar, M. Zimmermann, A. Ostwaldt, G. Goebel, J. Standfuß, B. Brenner
Abstract: The effective joining of aluminium with copper is one of the central technical goals involved in electro mobility. However, the joining of both metals by conventional fusion welding is challenging because of poor weldability arising from different chemical, mechanical and thermal properties of the materials and especially from the massive formation of hard and brittle intermetallic compounds (IMC) weld interface. In order to accomplish the difficult task of joining aluminium and copper several new joining technologies and strategies such as Laser Beam Welding (LBW) using highly dynamic beam deflection, Friction Stir Welding (FSW), Laser Induction Roll Plating (LIRP) and Electromagnetic Pulse Welding (EMPW) are under development at the Fraunhofer IWS. The current work describes the different technological approaches to the dissimilar joining of aluminium and copper. Thereby, the different joining technologies are compared with respect to weld quality. Special consideration is given to the study of interface morphology and microstructure of the welding zone. It will be shown that, depending on the joining method chosen the kind and extension of intermetallic phase formation differs considerably. Conclusions are drawn with respect to the applicability of the different joining methods.
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