Design and construction of a system for the solid, free-form fabrication of parts by laser assisted chemical vapor deposition PDF Download

Author: Robert Webb Carnes
Publisher:
ISBN:
Category : Machine parts
Languages : en
Pages : 66

View

Book Description

Author: Wade H. Shafer
Publisher: Springer Science & Business Media
ISBN: 1461534747
Category : Science
Languages : en
Pages : 421

View

Book Description
Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volumes were handled by an interna tional publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 34 (thesis year 1989) a total of 13,377 theses titles from 26 Canadian and 184 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this important annual reference work. While Volume 34 reports theses submitted in 1989, on occasion, certain univer sities do report theses submitted in previous years but not reported at the time.

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

View

Book Description
The objective of the research was to establish the technical approaches required to use localized laser induced chemical vapor deposition as an approach for solid freeform fabrication (SFF). The Three processing approaches to be developed are Selective Area Laser Deposition (SALD), Selective Area Laser Deposition Vapor Infiltration (SALDVI), and Selective Area Laser Deposition Joining (SALD-Joining) of ceramics.

Author: J.J. Beaman
Publisher: Springer
ISBN:
Category : Computers
Languages : en
Pages : 352

View

Book Description
Solid Freeform Fabrication: A New Direction in Manufacturing is a research monograph covering the emerging manufacturing technology of solid freeform fabrication. This new enabling technology is a set of manufacturing processes capable of dramatically reducing time to market by producing complex freeform solid objects directly from a computer model without part-specific tooling or knowledge. Solid Freeform Fabrication: A New Direction in Manufacturing presents a detailed description of present solid freeform fabrication techniques whilst providing a historical perspective of its development. Researchers in mechanical, chemical, electrical, and manufacturing engineering and materials and computer science will all find material of interest in this book. Particular subareas of concern include manufacturing methods, polymer chemistry, computational geometry, control, heat transfer, metallurgy, ceramics, optics, and fluid mechanics. Whilst this book covers the spectrum of solid freeform fabrication processes, particular emphasis is given to the area of thermal laser processing in which the authors have contributed pioneering research.

Author:
Publisher:
ISBN:
Category : Solid freeform fabrication
Languages : en
Pages : 804

View

Book Description

Author:
Publisher:
ISBN:
Category : Solid freeform fabrication
Languages : en
Pages : 458

View

Book Description

Author: Marc J. Madou
Publisher: CRC Press
ISBN: 1482274663
Category : Technology & Engineering
Languages : en
Pages : 1992

View

Book Description
Now in its third edition, Fundamentals of Microfabrication and Nanotechnology continues to provide the most complete MEMS coverage available. Thoroughly revised and updated the new edition of this perennial bestseller has been expanded to three volumes, reflecting the substantial growth of this field. It includes a wealth of theoretical and practical information on nanotechnology and NEMS and offers background and comprehensive information on materials, processes, and manufacturing options. The first volume offers a rigorous theoretical treatment of micro- and nanosciences, and includes sections on solid-state physics, quantum mechanics, crystallography, and fluidics. The second volume presents a very large set of manufacturing techniques for micro- and nanofabrication and covers different forms of lithography, material removal processes, and additive technologies. The third volume focuses on manufacturing techniques and applications of Bio-MEMS and Bio-NEMS. Illustrated in color throughout, this seminal work is a cogent instructional text, providing classroom and self-learners with worked-out examples and end-of-chapter problems. The author characterizes and defines major research areas and illustrates them with examples pulled from the most recent literature and from his own work.

Author: Olaf Rehme
Publisher: Cuvillier Verlag
ISBN: 3736932731
Category : Technology & Engineering
Languages : en
Pages : 304

View

Book Description
Cellular materials are spread all across the world. They can be found in nature, e.g. in bone and wood, as well as in engineering applications such as honeycomb sheets and aluminum foams to name but a few. Cellular materials have some unique properties which allow new and innovative applications beyond the scope of solid engineering materials. Especially their low density and therefore their outstanding stiffness-to-weight-ratio is of greatest importance in most applications. Functions of cellular materials could be lightweight structures of high stiffness, damping and absorption of mechanical energy, vibration control, acoustic absorption, heat exchange, filtering and numerous other tasks. Generally, a combination of these tasks in one part exhibits an optimized and therefore innovative overall performance. One recent development in production technologies is the field of Laser Freeform Fabrication (LFF) processes where parts are manufactured by application of thin layers of powder or sometimes liquid material. A laser beam melts and solidifies the material along contour lines and hatch areas according to slices of a corresponding 3D-CAD model. Among these processes the Selective Laser Melting (SLM) technology was advanced based upon the work in this thesis to allow the manufacture of periodic, open-cell lattice structures from engineering materials such as stainless steel, titanium, etc. In contrast to other cellular materials these lattice structures can be of well-defined, nearly arbitrary shape. Due to the layerwise fabrication the SLM process is also capable of creating lattice cores surrounded by solid shells allowing new degrees of geometric freedom in engineering design that was never experienced before in conventional machining. This allows the development of interesting new applications such as medical implants where the main issues are the improvement of osseointegration and realization of physioelastic material properties for an optimized bond between the implant and surrounding tissue. Lattice structures obtained from the SLM process can meet these requirements. This thesis contributes to the understanding of the mechanical properties of the new material class of SLM lattice structures. Their future incorporation in engineering designs requires a profound knowledge of failure mechanisms and operational limits. Therefore, a comprehensive summary is given on the state-of-the-art of cellular materials followed by a dedicated analysis on Laser Freeform Fabrication and an in-depth validation of the Selective Laser Melting capabilities. Readers with advanced knowledge on cellular materials or Laser Freeform Fabrication may skip sections 2 or 3, respectively. Next, all process constraints and boundary conditions for the manufacture of SLM lattice structures are elaborated. Then a bilateral approach was chosen to derive scaling laws and optimize the SLM lattice structures for given tasks. Firstly, a theoretical analysis comprises the examination of structural hypotheses for isotropic cellular materials before a generalized theory is developed for anisotropic SLM lattice structures. Different cubic, polyhedral and rhombic cell types are evaluated towards their producibility. Some of these cell types are preselected and are subject to numerical analysis where their mechanical properties are derived on the basis of the space framework theory. Secondly, an extensive experimental evaluation of test specimens is given. This includes examinations of the properties of SLM solids, the producibility of SLM lattice structures in terms of dimensions and testing of their mechanical properties such as strength and elasticity in compression, tension and shear load. The test procedures are divided in three stages. The first stage comprises the examination of the specific strength in dependence of the cell type to narrow down few optimum cell types for different applications. In the second and third stage these cell types are investigated towards their elasticity and strength in dependence of the cell size. Finally, this thesis concludes with scaling laws provided in accordance with the theoretical and experimental results. Opposed to simple power laws used for cellular materials these newly developed scaling laws consider leaps in properties at higher, so-called critical relative densities which can be obtained from SLM due to its high degree of design freedom. At the critical relative density SLM lattice structures cease being frameworks and become rather solids with pores. For future applications these scaling laws can be applied by design engineers to match particular requirements that can only be fulfilled by Laser Freeform Fabrication and its degrees of freedom in design. For the sake of completeness some sample applications in the field of medical implants are given in this thesis, which involve these scaling laws.

Author: Stephen C. Danforth
Publisher: Cambridge University Press
ISBN: 9781107413023
Category : Technology & Engineering
Languages : en
Pages : 236

View

Book Description
This book, first published in 2000, brings together experts in the field to discuss developments in (solid freeform) SFF and additive methods for fabricating metals, ceramics, polymers, and composites. It focuses on processing-structure-property relationships and relevant materials modeling approaches. Methods ranging from laser chemical vapor deposition (LCVD) to ink-jet based processes are presented. The entire range of materials, i.e., polymeric, metallic and ceramic components for structural, biological, and electronic applications, are also addressed, as are applications of these advanced processing techniques. A joint session with Symposium V, Materials Development for Direct Write Technologies, is included in the proceedings and features materials approaches that are currently being developed for fabricating mesoscopic integrated conformal electronics (MICE). These papers describe materials and methods to fabricate passive electronic devices (such as conductors, insulators and capacitors) on conformal surfaces at temperatures below 400°C. Topics include: direct metal fabrication; tooling and photo processing; direct patterning; composites and ceramics; and ceramics and solution processes.

Author: Marc J. Madou
Publisher: CRC Press
ISBN: 1420055194
Category : Technology & Engineering
Languages : en
Pages : 672

View

Book Description
Designed for science and engineering students, this text focuses on emerging trends in processes for fabricating MEMS and NEMS devices. The book reviews different forms of lithography, subtractive material removal processes, and additive technologies. Both top-down and bottom-up fabrication processes are exhaustively covered and the merits of the different approaches are compared. Students can use this color volume as a guide to help establish the appropriate fabrication technique for any type of micro- or nano-machine.