Recent Submissions

  • Structural Ceramic Components by 3D Printing 

    Cima, M.J.; Yoo, J.; Khanuja, S.; Rynerson, M.; Nammour, D.; Giritlioglu, B.; Grau, J.; Sachs, E.M. (1995)
    Several technical challenges exist in adapting Three Dimensional Printing (3DP) to processing of dense ceramic structures. The sintering rate of particulate bodies depends on the sintering mechanism, average powder size, ...
  • A Neural Network Architecture to Identify The Bone Tissue for Solid Freeform Fabrication 

    Marin, Nena; Crawford, Richard H. (1995)
    Computed tomography produces sets of tomograms for medical interpretation. Typical interpretation consists of imaging and simple observation on a 2D display screen, so that feature extraction and tissue differentiation is ...
  • Production of Injection Molding Tooling with Conformal Cooling Channels using The Three Dimensional Printing Process 

    Sachs, Emanuel; Allen, Samuel; Cima, Michael; Wylonis, Edward; Guo, Honglin (1995)
    Three Dimensional Printing is a desktop manufacturing process in which powdered materials are deposited in layers and selectively joined with binder from an ink-jet style printhead. Unbound powder is removed upon process ...
  • Fundamentals of Liquid Phase Sintering During Selective Laser Sintering 

    Bunnell, D.E.; Das, S.; Bourell, D.L.; Beaman, J.B.; Marcus, H.L. (1995)
    One of the advantages of the Selective Laser Sintering (SLS) process is that a variety of materials can be processed. However, the goal of being able to produce fully dense metal parts with no post processing has been ...
  • Deposition Rates of Silicon Carbide by Selected Area Laser Deposition 

    Lee, Y.L.; Tompkins, J.V.; Sanchez, J.M.; Marcus, H.L. (1995)
    The deposition rates using pure tetramethylsilane (TMS) as precursor are calculated numerically for a ~od .grown by th~ .Selected Area Laser Dep?sition J?rocess. In particular, the dependence of the kinettcs of deposItion ...
  • A Sieve Feed System for the Selective Laser Sintering Process 

    Melvin III, Lawrence S.; Beaman Jr., Joseph J. (1995)
    A sieve feed system has been designed for use with the Selective Laser Sintering process. The sieve feed system uses electrostatic charge to help apply polymer powder to a green powder bed. The sieve feed system was ...
  • Nickel Applied for Selective Laser Sintering Using a Magnetic Field 

    Melvin III, Lawrence S.; Beaman Jr., Joseph J. (1995)
    Metal powder was applied for the Selective Laser Sintering process using the sieve feed system and a magnetic field. The magnetic field had a negative effect on final part quality as measured by a reduction in final ...
  • Ceramic Joining by Selective Beam Deposition 

    Tompkins, J.V.; Birmingham, B.R.; Marcus, H.L. (1995)
    Current methods ofjoining of ceramic components may compromise the strength, chemical resistance, or high temperature properties of the resulting ceramic parts. A new method of joining, Ceramic Joining by Selective Beam ...
  • Emissivity of Powder Beds 

    Sih, Samuel Sumin; Barlow, Joel W. (1995)
    A simple model for estimating the emissivity ofthe surface of a powder bed from knowledge only ofthe bed porosity and solid emissivity is presented. Estimates by this model are compared with experimental measurements for ...
  • The Prediction of the Thermal Conductivity of Powders 

    Sih, Samuel Sumin; Barlow, Joel W. (1995)
    A revised view factor for the prediction of the thermal conductivity of powder beds at high temperatures that includes a radiation contribution to the conductivity is presented. Comparison of predictions by this equation ...
  • Solid Freeform Fabrication of Silicon Nitride Shapes by Selective Laser Reaction Sintering (SLRS) 

    Marcus, H.L.; Birmingham, B.R. (1995)
    SelectiveLaser ReactionSinteringis a variation ofselective laser sintering (SLS) that incorporates anjn~situreaction underthe·scannedbeamtofabricate shapes from materials not directly accessible by traditional SLS. ...
  • Selective Area Laser Deposition from Titanium Tetrachloride 

    Jakubenas, Kevin; Marcus, H.L. (1995)
    Selective Area Laser Deposition (SALD) has demonstrated the ability to deposit controlled shapes of silicon carbide and silicon nitride by using a laser beam to decompose a precursor gas. The goal of the work here is to ...
  • Densification Behavior of SLS Processed Al2O3/Al Composite 

    Rao, T. Srinvasa; Bourell, D.L.; Marcus, H.L. (1995)
    Production of structurally sound parts by any rapid prototype technique is essential, because fully functional features are necessary where application testing is required. In the present work, a powder blend of A1203/AI ...
  • Selective Laser Sintering Preparation and Tribological Testing of Nanostructured Tungsten Carbide-Cobalt Composites 

    Cottle, Rand D.; Birmingham, Britton; Eliezer, Zwy; Marcus, Harris L. (1995)
    This paper describes the results to date ofresearch done to compare and contrast the tribological properties ofnanostructured tungsten carbide-cobalt composites consolidated by selective laser sintering (SLS) and ...
  • Optimizing Part Quality with Orientation 

    Thompson, David C.; Crawford, Richard H. (1995)
    The orientation of SFF-manufactured parts can have a significant effect on the quality of the parts, in both surface effects and strength. Currently, orientation is either ignored or set on the basis of experience. This ...
  • Modeling of Dynamic Effects Caused by the Beam Delivery System in Selective Laser Sintering 

    Turner, Irem Y.; Wood, Kristin L.; Busch-Vishniac, Ilene J. (1995)
    In this work, the machine dynamic response in Selective Laser Sintering is investigated with the purpose of determining the causes of scanning errors. Machine subcomponents are first investigated to determine their ...
  • Effect of Particle size on SLS and post-processing of Alumina with Polymer binders 

    Subramanian, Kamatchi; Barlow, J.W.; Marcus, H.L. (1995)
    Alumina powders with mean particle size of 15 J.lm, 2 J.lm and 0.5 J.lm were processed by SLS using polymer binders. The 2 J.lffi and 0.5 J.lm powders were given a thermal agglomeration treatment before SLS. The green ...
  • Free Form Fabrication of High Strength Metal Components and Dies 

    Bampton, C.C; Burkett, R. (1995)
    A two-stage method has been devised for free form fabrication of nickel, iron and copper based alloy parts with shape and property control equal or superior to investment castings in the same base alloys. A major ...
  • Integration of a Solid Freeform Fabrication Process into a Feature-Based CAD System Environment 

    Suh, Young S.; Wozny, Michael J. (1995)
    To cope with the increasing market competition, the concurrent engineering (CE) concept is being adopted by many companies to reduce the cost and the cycle time for manufacturing quality parts. To build a successful CE ...
  • Sheareography - a Practical Optical Testing and Measuring Method 

    Steinchen, W. (1995)
    Shearography is a laser optical method which is suited for either nondestructive testing or for strain analysis. Contrary to holography which measures surfach displacements, shearography measures derivatives of surface ...

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