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Contemporary Machining Processes for New Materials
Published in E. S. Gevorkyan, M. Rucki, V. P. Nerubatskyi, W. Żurowski, Z. Siemiątkowski, D. Morozow, A. G. Kharatyan, Remanufacturing and Advanced Machining Processes for New Materials and Components, 2022
E. S. Gevorkyan, M. Rucki, V. P. Nerubatskyi, W. Żurowski, Z. Siemiątkowski, D. Morozow, A. G. Kharatyan
Application of lasers to surface treatment includes the following (Steen, 2003): Surface heating for transformation hardening or annealingSurface melting for homogenization, microstructure refinement generation of rapid solidification structures and surface sealingSurface alloying for improvement of corrosion, wear, or cosmetic propertiesSurface cladding for similar reasons as well as changing thermal properties such as melting point or thermal conductivitySurface texturing for improved paint appearancePlating by Laser Chemical Vapor Deposition (LCVD)Laser Physical Vapor Deposition (LPVD)
Synthesis of Nanomaterials for Drug Delivery
Published in Vineet Kumar, Praveen Guleria, Nandita Dasgupta, Shivendu Ranjan, Functionalized Nanomaterials II, 2021
Hemant K. S. Yadav, Shahnaz Usman, Karyman Ahmed Fawzy Ghanem, Rayisa Beevi
Laser chemical vapor deposition is a derivative of chemical vapor deposition. This technique is mostly used in the synthesis of carbon nanotubes. The difference between CVD and LCVD is that the heat source in CVD is replaced by a laser beam. Laser chemical vapor deposition is of two types: pyrolytic and photolytic.[56] In pyrolytic LCVD, a laser beam is used to induce the chemical reaction that results in the chemical vapor deposition. Pyrolytic laser chemical vapor deposition is influenced by the wavelength of the laser beam. This technique can be used if small and localized deposits are desired.[56,57] In the photolytic laser chemical vapor deposition technique, photodecomposition of the sample material takes place, and the sample material deposits onto the substrate. Added to this, the laser beam is set in a parallel position to the substrate. Furthermore, both the techniques, i.e. pyrolytic and photolytic LCVD can be combined together. Combining both techniques is referred to as photo physical LCVD. In such a case, twin beam or a single beam can be used to activate the combined processes.[57]
Multifunctional Printing
Published in Amit Bandyopadhyay, Susmita Bose, Additive Manufacturing, 2019
Dishit Paresh Parekh, Denis Cormier, Michael D. Dickey
LDW uses a laser beam to create complex 3D structures with selfsupporting features having fine resolutions without the use of expensive masks or lithographic methods. Laser writing techniques9,190–202 create patterned materials through gas-phase deposition, ablation, selective sintering, or reactive chemical processes that include several methods such as thin film consolidation,203,204 laser chemical vapor deposition199 (LCVD), laser ablation,193,194 laser-enhanced electroless plating205,206 (LEEP), laser-induced forward transfer207,208 (LIFT) and backward transfer209 (LIBT), laser-guided DW12 (LGDW), flow-guided DW12 (FGDW), matrix-assisted pulsed laser direct-write195,196 (MAPLE), two/multi-photon polymerization (MPP),191,201 and selective laser sintering9,197,198 (SLS), among others. All of these techniques utilize lasers to localize energy as a means to modify, deposit, or remove material.
Influence of oxygen partial pressure on SmBa2Cu3O7-δ film deposited by laser chemical vapor deposition
Published in Journal of Asian Ceramic Societies, 2021
Ting Wang, Rong Tu, Canlin Zhang, Song Zhang, Kaidong Wang, Takashi Goto, Lianmeng Zhang
The second generation of high-temperature superconducting tape REBCO has been attracted much attention in recent years, which has become a hot topic in present research, such as SmBa2Cu3O7−δ (SmBCO) [1,2]. SmBCO superconductor has been applied in different fields (e.g. cable transmission, motor, generator, magnetic energy storage system), which was due to its high critical temperature (Tc) and critical current density (Jc) [3,4]. The common physical deposition method of SmBCO film, such as pulsed laser deposition (PLD) [5–7], was not suitable for the large-scale commercial application, because of its high vacuum degree requirement and low deposition rate. Compared with PLD, metal organic chemical vapor deposition (MOCVD) is more adapted to industrial production of thin films. The vacuum degree requirement of MOCVD is not high, which is beneficial to reduce the cost of equipment. Moreover, the preparation process is simple and the preparation parameters are easier to control [8–10]. Therefore, the preparation of SmBCO film by MOCVD has a better application prospect. However, the deposition rate of traditional MOCVD method still could not satisfy the large-scale and commercial preparation of SmBCO films. In order to increase the deposition rate, laser has been introduced into the chemical vapor deposition [11–14]. Laser chemical vapor deposition (LCVD) can remarkably improve chemical reaction of precursors on substrates, which is conducive to enhance the deposition rate of film.