Zobrazeno 1 - 10
of 275
pro vyhledávání: '"Paul F. Becher"'
Autor:
Paul F. Becher
Publikováno v:
Journal of the Korean Ceramic Society. 53:575-580
Publikováno v:
Acta Materialia. 89:73-87
Electron back scatter diffraction (EBSD) techniques as well as a novel microstructure mapping technique for the direct measurement of local grain-to-grain movements, provided the tools necessary for the assessment of creep deformation mechanisms of a
Publikováno v:
Acta Materialia. 84:359-367
A grain boundary sliding creep mechanism, accommodated by “mantle” dislocation activities, is shown to allow for large strain ( e > 0.08) during the creep of a ZrB 2 –20% SiC composite at 1800 °C. We characterized the local grain deformation b
Publikováno v:
Journal of the European Ceramic Society. 33:2407-2420
Flexural creep studies of ZrB 2 –20 vol% SiC ultra-high temperature ceramic were conducted over the range of 1400–1820 °C in an argon shielded testing apparatus. A two decade increase in creep rate, between 1500 and 1600 °C, suggests a clear tr
Autor:
Sea-Hoon Lee, Hai-Doo Kim, Young-Jo Park, Jae-Woong Ko, Paul F. Becher, Hua-Tay Lin, Chun-Rae Cho
Publikováno v:
Journal of the Korean Ceramic Society. 50:218-225
The densification behavior and strength of sintered reaction bonded silicon nitrides (SRBSN) that contain Lu 2 O3-SiO 2 additives were improved by the addition of fine Si powder. Dense specimens (relative density: 99.5%) were obtained by gas-pressure
Publikováno v:
Journal of the European Ceramic Society. 32:3453-3462
Hot pressed ZrB2–20 vol.% SiC ultra-high temperature ceramic composites have been prepared for strength and fracture investigations. Two composites fabricated under differing hot pressing temperatures with (ZSB) and without (ZS) B4C sintering aids
Publikováno v:
Journal of the Korean Ceramic Society. 49:318-324
Reaction-bonded silicon nitrides containing rare-earth oxide sintering additives were densified by gas pressure sintering. The sintering behavior, microstructure and mechanical properties of the resultant specimens were analyzed. For that purpose, Lu
Autor:
Theo Fett, Johannes Wippler, Michael J. Hoffmann, Gerold A. Schneider, Stefan Fünfschilling, Rainer Oberacker, Jamie J. Kruzic, Thomas Böhlke, Paul F. Becher, Hüseyin Özcoban, Thomas Schwind
Publikováno v:
Acta Materialia. 59:3978-3989
Crack-bridging mechanisms can provide substantial increases in toughness coupled with strength in ceramics. Herein, we describe the various bridging mechanisms, their toughening contributions and how they are affected by microstructure in silicon nit
Autor:
Raphaelle Satet, Michael J. Hoffmann, Paul F. Becher, Stuart Hampshire, Michael J. Pomeroy, Michael J. Lance
Publikováno v:
International Journal of Applied Glass Science. 2:63-83
The silicon oxynitride glasses take advantage of nitrogen-bonding to attain high elastic modulus, increased softening temperatures and viscosities, greater slow crack growth resistance and modest gains in fracture resistance. Of the oxynitride glasse
Autor:
F. W. Averill, Gayle S. Painter, Hua-Tay Lin, Klaus van Benthem, Shirley B. Waters, Naoya Shibata, Paul F. Becher
Publikováno v:
Journal of the American Ceramic Society. 93:570-580
The evolution of β-Si 3 N 4 microstructures is influenced by the adsorption of rare earth (RE) elements at grain surfaces and by the viscosity of the intergranular phases. Theoretical and scanning transmission electron microscopy studies show that t