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Light-weight ferromagnetic Co-Ni-Al:Ti composites were consolidated by spark plasma sintering. Powders of ball-milled Co-Ni-Al and gas atomized α-Ti were mixed together in three different ratios and spark plasma sintered at 950°C, using two sintering times, i.e. dwell times at the maximal temperatures: 1 and 5min. The composites were successfully compacted and new intermetallic phases were formed...
A series of samples was sintered from nanometric BaTiO3 powder by spark plasma sintering (SPS). Porosity on ultra-fine size scales, hardly accessible for quantification by conventional techniques, was measured by small angle neutron scattering (SANS). Band gap was estimated from diffuse reflectance measurements. Sintered tablets were polished, sputtered by aluminum to create electrode system and tested...
Quality of electrically conductive adhesives is a main component in electronic packaging. It highly influences the total quality of a product containing such a component. With time and usage, adhesives lose some of the qualities. In some cases, changes in the molecule structure for example, can be responsible for this influence on material characteristics. This process is known as aging. It can badly...
Electrical conductivity of electrically conductive adhesives is controlled with three mechanisms. These mechanisms are described — a phonon-electron interaction, a constriction mechanism and a tunnel mechanism. If the phonon-electron and constriction mechanisms dominate; the temperature dependence of resistivity is positive and linear, and the temperature coefficient of resistivity is positive. If...
Contact resistance between adhesive and pad is examined. Three types of adhesives based on bis-phenol resin matrix filled with silver flakes are studied on copper, nickel and gold surface finishes. The contact resistance is calculated as a difference between result of three terminal and four-terminal measurements. It is found that nickel surface finish is not proper for adhesive assembly, because...
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