The microelectrophoresis apparatus consists of a laterally oriented rectangular chamber and Ag-AgCl electrodes. This has been described in detail previously.5 Since that description several minor technical changes have been made in order to facilitate cleaning and repair of the apparatus. The sintered glass discs which separate the observation chamber from the electrode compartments are vertica...

The sintering of metal powders is an efficient and versatile technique to fabricate porous metal elements such as filters, diffusers, and membranes. Neck formation between particles is, however, critical to tune the porosity and optimize mass transfer in order to minimize the densification process. In this work, macro-porous stainless steel (SS) hollow-fibers (HFs) were fabricated by the extrus...

PURPOSE In this study, we aimed to evaluate the amount of marginal gap with two different substructure materials using identical margin preparations. MATERIALS AND METHODS Twenty stainless steel models with a chamfer were prepared with a CNC device. Marginal gap measurements of the galvano copings on these stainless steel models and Co-Cr copings obtained by a laser-sintering method were made...

Although powder metallurgy is an economical method for production of near net shape components, machining operations are often required to deliver desired geometrical features, dimensional tolerances, and surface finish of PM parts. Machining enhancers are used to improve the machinability of PM components and to increase tool life. MnS is the most common machinability enhancer used for PM stee...

Tungsten-steel metal matrix composites are consolidated using electro-discharge sintering. At first steel and tungsten powders sintered separately then 25 vol% W, 50 W 75 mixed sintered. A thorough process parametric study is carried out involving analysis of the influence particle size distribution, sintering pressure, discharge energy on maximum current obtained residual porosity. Thermal exp...