8 research outputs found
Implementation and Removal of an Affirmative-Action Quota: The Impact on Task Assignment and Workers’ Skill Acquisition
The Effect of Repeated Tense-Release Sequences on EMG and Self-Report of Muscle Tension: An Evaluation of Jacobsonian and Post-Jacobsonian Assumptions About Progressive Relaxation
Preparation of high porosity metal foams
Metal foams with porosities greater than 90 pet were prepared by a novel powder metallurgy route using a polymeric vehicle. Coarse titanium powder and fine carbonyl iron powder were tested. The powders were blended with each component of a two-part polyol-isocyanate foaming system, and the resulting suspensions were mixed and allowed to expand. Although the resulting polymer-metal foam was closed cell, particles were not retained in the windows. Upon pyrolysis to remove the resin, the windows opened and the final sintered metal foam was reticulated. Such foams present very low sintered density and are correspondingly weak after sintering but offer a fine reticulated structure with cell diameters in the region of 100 to 200 mum. They may have applications in the areas of catalysis, biomaterials, and composites