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Materials Science and Engineering Faculty Research & Creative Works
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Articles 1 - 11 of 11
Full-Text Articles in Engineering
Experimental And Theoretical Investigation Of Mixing In A Bottom Gas-Stirred Ladle, Jun Aoki, Brian G. Thomas, Jörg Peter, Kent D. Peaslee
Experimental And Theoretical Investigation Of Mixing In A Bottom Gas-Stirred Ladle, Jun Aoki, Brian G. Thomas, Jörg Peter, Kent D. Peaslee
Materials Science and Engineering Faculty Research & Creative Works
No abstract provided.
Novel Yttrium-Stabilized Zirconia Polymeric Precursor For The Fabrication Of Thin Films, Roger M. Smith, X.-D. Zhou, Wayne Huebner, Harlan U. Anderson
Novel Yttrium-Stabilized Zirconia Polymeric Precursor For The Fabrication Of Thin Films, Roger M. Smith, X.-D. Zhou, Wayne Huebner, Harlan U. Anderson
Materials Science and Engineering Faculty Research & Creative Works
An acetate-based polymeric precursor for producing yttrium-stabilized zirconia (YSZ) was developed. The precursor was prepared under ambient conditions and contains only yttrium and zirconium cations. Dense, crack-free films were fabricated with this precursor on alumina substrates at a rate of 60 nm per deposition, producing polycrystalline YSZ at temperatures as low as 600 °C. Grain growth in thin YSZ films followed Arrhenius equation with an activation energy approximately 0.45 eV. The residual strain in YSZ films decreased with increasing annealing temperature from 600 to 900 °C.
Pm Manufacturing Research Boosted By Continuous Sintering Furnace, Joseph William Newkirk
Pm Manufacturing Research Boosted By Continuous Sintering Furnace, Joseph William Newkirk
Materials Science and Engineering Faculty Research & Creative Works
University of Missouri-Rolla has recently acquired a Fluidtherm laboratory continuous sintering furnace. Custom designed and built for PM research, the furnace will allow current efforts in sintering development, pressure gas quenching of PM steels, optimisation of toughness and fatigue properties of PM parts, and production of metal matrix composites to be enhanced and extended.
Metal Superplasticity Enhancement And Forming Process, Rajiv S. Mishra, Murray W. Mahoney
Metal Superplasticity Enhancement And Forming Process, Rajiv S. Mishra, Murray W. Mahoney
Materials Science and Engineering Faculty Research & Creative Works
A shaped metallic component is formed by friction stirring at least a segment of a single piece of bulk metal to impart superplasticity thereto and thereby yield a single superplastic metal blank from the single piece of bulk metal. The metal blank is then deformed by a metal deformation process such as forging, rolling, drawing, bending, extruding, gas forming, punching, and stamping.
Bioactive Materials, D. E. Day, Erik M. Erbe, Marina Richard, Joshua A. Wojcik
Bioactive Materials, D. E. Day, Erik M. Erbe, Marina Richard, Joshua A. Wojcik
Materials Science and Engineering Faculty Research & Creative Works
Bioactive substantially silica-free glass material with a hydroxyapatite layer thereon is described, as well as methods for producing hydroxyapatite on a borate glass.
Annealing-Induced Full Amorphization In A Multicomponent Metallic Film, J. P. Chu, C. T. Liu, T. Mahalingam, S. F. Wang, Matthew O'Keefe, Benedict Y. Johnson, C. H. Kuo
Annealing-Induced Full Amorphization In A Multicomponent Metallic Film, J. P. Chu, C. T. Liu, T. Mahalingam, S. F. Wang, Matthew O'Keefe, Benedict Y. Johnson, C. H. Kuo
Materials Science and Engineering Faculty Research & Creative Works
We present direct experimental evidence that controllable amorphization and nanocrystallization during annealing of metastable films could serve as a precursor for exciting nanomaterials. The interesting discovery is that certain sputtered crystalline films become completely amorphous when annealed in the temperature range between the glass temperature and the crystallization temperature. Unlike other metallic glassy materials that exhibit annealing-induced devitrification, our good glass-forming films are transformed into various nanoscale and amorphous structures due to the annealing process. The formation of an amorphous phase gives rise to notable alterations in the electrical and mechanical properties of the film.
Optical Characterization Of Ceramic Thin Films: Applications In Low-Temperature Solid Oxide Fuel-Cell Materials Research, Vladimir Petrovsky, Tatiana Petrovsky, Harlan U. Anderson, Brian P. Gorman
Optical Characterization Of Ceramic Thin Films: Applications In Low-Temperature Solid Oxide Fuel-Cell Materials Research, Vladimir Petrovsky, Tatiana Petrovsky, Harlan U. Anderson, Brian P. Gorman
Materials Science and Engineering Faculty Research & Creative Works
Characterization of thin film solid oxide fuel-cell materials can be difficult due to the range of porosities in electrodes and electrolytes as well as the nano-sized pores and particles. In this study, optical characterization techniques such as ultraviolet-visible transmission and reflection spectrophotometry are illustrated as methods for achieving information about the film density from the film refractive index as well as the film thickness. These techniques were used to investigate the sintering process of colloidal CeO2 on sapphire substrates and polymeric precursor-derived ZrO2:16%Y (YSZ) thin films on silicon over the temperature range 400-1000 °C, and the results were compared with …
Polarized Neutron Measurement Of Magnetic Order In Yba₂Cu₃O6₆.₄₅, H. A. Mook, Pengcheng Dai, S. M. Hayden, A. Hiess, S. H. Lee, Fatih Dogan
Polarized Neutron Measurement Of Magnetic Order In Yba₂Cu₃O6₆.₄₅, H. A. Mook, Pengcheng Dai, S. M. Hayden, A. Hiess, S. H. Lee, Fatih Dogan
Materials Science and Engineering Faculty Research & Creative Works
Orbital current order of the d-density-wave type has been postulated to explain the pseudogap in high temperature superconductors. We have performed neutron scattering experiments to search for this order and show here the results obtained on an YBa2Cu3O6.45 sample using the best neutron spectrometers available. We argue that the data are consistent with a small, largely c-axis-directed moment, found below about 200 K.
High Gradient Multilayer Insulator Technology, Harlan U. Anderson, Stephen E. Sampayan, G. J. Caporaso, W. C. Nunnally, D. M. Sanders, J. A. Watson, Mike L. Krogh
High Gradient Multilayer Insulator Technology, Harlan U. Anderson, Stephen E. Sampayan, G. J. Caporaso, W. C. Nunnally, D. M. Sanders, J. A. Watson, Mike L. Krogh
Materials Science and Engineering Faculty Research & Creative Works
We are investigating a novel insulator concept that involves the use of alternating layers of conductors and insulators with periods less than 1 mm. These structures perform 1.5 to 4 times better than conventional insulators in long pulse, short pulse, and alternating polarity applications. We have surveyed our ongoing studies by investigating the performance under long pulse electron beam, short pulse, and full reversing conditions.
Thermal Efficiency Of Steel Melting, Kent D. Peaslee, Semen Naumovich Lekakh, Bradley Randall
Thermal Efficiency Of Steel Melting, Kent D. Peaslee, Semen Naumovich Lekakh, Bradley Randall
Materials Science and Engineering Faculty Research & Creative Works
This paper presents the results of energy consumption measurements at steel foundries using induction and/or electric arc furnace melting. Statistical methods, infrared thermography, and numerical investigations were used for analysis of heat losses. The influence of different melting practices on energy losses was examined. Industrial experiments in isothermal holding of liquid steel in induction furnaces under different power inputs were used for evaluation of the real values of heat losses by radiation from liquid steel and conductivity through lining. Average values and statistical distributions of energy consumptions for melting steel are presented in this article.
Evaluation Of Microstructure And Superplasticity In Friction Stir Processed 5083 Al Alloy, Indrajit Charit, Rajiv S. Mishra
Evaluation Of Microstructure And Superplasticity In Friction Stir Processed 5083 Al Alloy, Indrajit Charit, Rajiv S. Mishra
Materials Science and Engineering Faculty Research & Creative Works
Friction stir processing (FSP) has been developed as a potential grain refinement technique. In the current study, a commercial 5083 Al alloy was friction stir processed with three combinations of FSP parameters. Fine-grained microstructures with average grain sizes of 3.5-8.5 µm were obtained. Tensile tests revealed that the maximum ductility of 590 was achieved at a strain rate of 3 x 10-3 s-1 and 530 °C in the 6.5-µm grain size FSP material, whereas for the material with 8.5-µm grain size, maximum ductility of 575 was achieved at a strain rate of 3 x 10-4 s-1 …