Papers by Keyword: Nanoparticulates

Abstract: Nano-particulates are being used in conjunction with Direct Write Technologies for fabrication of electronic devices, sensors, and in tissue engineering. The materials being used in Direct Write Technologies predominately are suspensions, solutions or pastes comprised from nano-particulate metals, oxides or organics. This paper will present a comparison of several nano-particle silver inks being evaluated for use by one of these Direct Write Technologies, Maskless Meso-Scale Material Deposition (M3D) being developed by Optomec, Inc., Albuquerque, NM. USA. The silver inks in this case were deposited by the M3D process and then cured by sintering by both oven and by laser. Optical microscopy and Scanning Electron Microscopy (SEM) were used to examine the resultant cured material. The surface resistivity of these deposits was determined as a measure of their quality. A soft magnetic inductor material was also fabricated through a combination of nickel and iron oxide nano-particles. The results obtain with this inductor material are also discussed.

Abstract: Magnesium based composite with 2.5 weight percentage of nano-sized Al2O3 particulates reinforcement was fabricated using powder metallurgy technique. Al2O3 particulates with an equivalent size of 50-nm were used as reinforcement. Microstructural characterization of the materials revealed recrystallization and grain refinement due to the presence of nano-Al2O3. Mechanical properties characterization revealed that the presence of nano-Al2O3 particulates as reinforcement lead to a significant increase in hardness, elastic modulus, 0.2% yield strength and UTS and ductility of pure magnesium. The results revealed that the specific tensile properties of these materials are superior when compared to high strength magnesium alloy AZ91 reinforced with much higher weight percentage of SiC. An attempt is made in the present study to correlate the effect of nano-sized Al2O3 particulates as reinforcement with the microstructural and mechanical properties of magnesium.