• Adaptive Slicing of Solid Freeform Fabrication Processes 

      Suh, Young Seok; Wozny, Michael J. (1994)
      The Solid Freeform Fabrication (SFF) process significantly reduces part specific setup manufacturing lead time. This process has been primarily used in fabricating prototypes for design visualization and verification. ...
    • Advances in Selective Area Laser Deposition of Silicon Carbide 

      Tompkins, J.V.; Laabi, R.; Birmingham, B.R.; Marcus, H.L. (1994)
      Selective Area Laser Deposition (SALD) is a Solid Freeform Fabrication (SFF) technique which uses a scanning laser beam to produce solid material by locally decomposing a gas precursor. In this work, a focused C02 laser ...
    • Anisotropy in Alumina Processed by SLS. 

      Kamatchi Subramanian, P.; Vail, N.K.; Barlow, J.W.; Marcus, H.L. (1994)
      Alumina powders of 15~m size and 2~m size were processed by SLS using PMMA and a copolymer. The 2~m powders were agglomerated and mixed with the polymer powder before being processed by SLS. SLS bend strength specimens ...
    • Benchmarking of Rapid Prototyping Systems - Beginning to Set Standards 

      Jayaram, Dureen; Bagchi, Amit; Jara-Almonte, C.C.; Oreilly, Sean (1994)
      Many rapid prototyping (RP) technologies are available today and more are being developed around the world. The absence of benchmarking standards in the RP industry has led manufacturers to use their own standards and ...
    • Computer-derived microstructures by 3D Printing: Sio- and Structural Materials 

      Cima, M.J.; Sachs, E.; Cima, L.G.; Yoo, J.; Khanuja, S.; Borland, S.W.; Wu, B.; Giordano, R.A. (1994)
      3D Plinting is a rapid prototyping technique to manufacture functional components directly from computer models. The process involves spreading the powder in thin layers and then selective binding of the powder using a ...
    • Densification of Selective Laser Sintered Metal Part by Hot Isostatic Pressing 

      Beaman, Joseph Jr.; Agarwala, Mukesh K.; Bourell, David L. (1994)
      Metal matrix alloy composite parts were made from powders by Selective Laser Sintering (SLS). In this study, partially dense (60%-80%) metal parts made by SLS were densified to full density (>98%) by hot isostatic pressing ...
    • Direct Laser Sintering of Metals and Metal Melt Infiltration for Near Net Shape Fabrication of Components 

      Wilkening, C.; Sindel, M.; Pintat, T.; Greul, M.; Nyrhila, O. (1994)
      Direct laser sintering of metal powders is a great challenge for Rapid Prototyping (RP) because of the high potential of application, for example prototype tooling for polymer extrusion. Recent development in laser ...
    • Extrusion Methods For Solid Freeform Fabrication 

      Calvert, Paul; Crockett, Robert; Lombardi, John; O'Kelly, John; Stuffle, Kevin (1994)
      It is becoming clear that current SFF methods are members of a potentially very large family. As with current forming methods, it is to be expected that particular materials and objects will lend themselves best to ...
    • FDM® Technology Process Improvements 

      Comb, James; Priedeman, William; Turley, Patrick W. (1994)
      Since the introduction ofrapid prototyping technology as a tool for time compression and concurrent engineering in the design and manufacturing process, many enhancements and refinements have been made based on the ...
    • Fundamentals of Liquid Phase Sintering Related to Selective Laser Sintering 

      Bunnell, D.E.; Bourell, D.L.; Marcus, H.L. (1994)
      Liquid phase sintering is one of the underlying principles that must be modeled and understood when the Selective Laser Sintering (SLS) process is used. This paper describes the initial studies being conducted to ...
    • Histogram - Based Algorithm for Semiautomated Three-Dimensional Craniofacial Modeling 

      Levy, Richard A. (1994)
      Volume averaging artifacts in medical imaging result from voxel occupancy by more than one tissue type and, with anisotropic voxels, may be decreased by changing the imaging plane orientation relative to the target tissue ...
    • Integration of Numerical Modeling and Laser Sintering with Investment Casting 

      Pintant, T; Sindel, M.; Greul, M.; Burblies, A.; Wiklening, C. (1994)
      Industry has a great demand for metallic prototypes to speed up product development. At present there are several RP-technologies for direct fabrication of metal components in development. Today secondary processing of ...
    • LAPS - Laser Aided F.owder S.olidification - Technology for the direct production of metallic and polymer parts 

      Eyerer, P.; B. Keller, J. Shen (1994)
      The prototypes of today's commercial available RP-Systems (e.g. StereolithographySystems) are suitable mainly for designing and, if even, for restricted functional tests. From this it can be concluded that for obtaining ...
    • Manufacture Of Injection Molds Using SLS 

      Badrinarayan, B.; Barlow, J.W. (1994)
      This paper describes the use of SLS technology for the fabrication of injection mold cavities. Green shapes were made from metal - copolymer powder mixtures by SLS. The copolymer was gradually burnt out and the metal was ...
    • Measurement and Prediction of the Thermal Conductivity of Powders at High Temperatures 

      Sumin Sih, Samuel; Barlow, Joe W. (1994)
      An equation for the prediction of the thermal conductivity of powder beds up to high temperatures is suggested by the authors. The predicted values by the equation are compared with the values of the thermal conductivity ...
    • Modeling of Polymer Degradation in SLS 

      Vail, N.K.; Barlow, J.W. (1994)
      A simple computer model has been developed to predict the thermal degradation of polymer binders used in the fabrication of composite green shapes from high temperature ceramic materials. Decomposition rate kinetics of ...
    • Modeling of Selected SFF Process Limits 

      Mendez, Patricio; Brown, Stuart (1994)
      An analytical model of the thermal field for one scan line during SLS is developed. Quantitative relationships between net heat input and beam velocity are stated for sintering at a given distance from the center of the ...
    • Multi-layered composites using photolithography 

      Bagchi, Amit; Beesley, Robert (1994)
      The mechanical properties of the parts made using solid freeform fabrication technologies are limited by their resins used. Previous research has shown that the mechanical properties of these parts can be enhanced ...
    • Multiphase Solidification - a new process towards ,. prototypes and a new data 1I1nlit,1lo1ll"'it'l"llA1l,a 

      Geiger, Martin; Greul, Matthias; Steger, Wilhelm; Sindel, Manfred (1994)
      The production of metallic and ceramic parts with RP technologies is requested. Multiphase Jet Solidification (MJS) is a process which reveals good results to develop a commercial system due to this task. Low viscous ...