Zobrazeno 1 - 10
of 48
pro vyhledávání: '"Bernard J. Hockey"'
Publikováno v:
Journal of Biomedical Materials Research Part B: Applied Biomaterials. :116-125
Clinical data indicate that secondary caries and restoration fracture are the most common problems facing tooth restorations. Our ultimate goal was to develop mechanically-strong and caries-inhibiting dental composites. The specific goal of this pilo
Autor:
Jonathan D. French, Bernard J. Hockey, Sheldon M. Wiederhorn, William E. Luecke, Ralph F. Krause
Publikováno v:
Journal of the American Ceramic Society. 82:1233-1241
We have characterized the tensile creep, rupture lifetime, and cavitation behavior of a commercial, gas-pressure-sintered silicon nitride in the temperature range 1150° to 1400°C and stress range 70 to 400 MPa. Individual creep curves generally sho
Autor:
Sheldon M. Wiederhorn, Carol A. Handwerker, Doh-Yeon Kim, Jung-Hae Choi, Bernard J. Hockey, John E. Blendell
Publikováno v:
Journal of the American Ceramic Society. 85:1841-1844
Cavities formed in ruby (99.46Al 2 O 3 .0.54Cr 2 O 3 ) by the healing and annealing of indentation cracks at 1600°C are more equiaxed than similar cavities in sapphire. Surface energies for the observed facet planes (R, S, and A) relative to the sur
Publikováno v:
Journal of Research of the National Institute of Standards and Technology
In previous studies nano sized hydroxyapatite (HA) particles were prepared by solgel or precipitation methods, in which the products were washed by aqueous or non-aqueous liquids to remove impurities or undesired components. The washing is know to mo
Autor:
Jonathan D. French, Bernard J. Hockey, Michael J. Hoffmann, Antonio R. de Arellano Lopez, William E. Luecke, Kyung Jin Yoon, Sheldon M. Wiederhorn
Publikováno v:
Journal of the American Ceramic Society. 87:421-430
The effect of grain size on the tensile creep of silicon nitride was investigated on two materials, one containing 5% by volume Yb2O3, the other containing 5% by volume Yb2O3 and 0.5% by mass Al2O3. Annealing of the Al2O3-free silicon nitride for a l
Publikováno v:
Materials Science Forum. 439:288-296
Commercial nano crystalline TiO 2 powders were used to fabricate coating layers, using plasma spray coating technique. The reactivity of photocatalyst of the plasma sprayed coating layers was characterized depending upon the different particle sizes
Autor:
Joaquín Lira-Olivares, Soo Whon Lee, Bernard J. Hockey, Seungho Kim, Carlos Morillo, Koichi Niihara, Tohru Sekino
Publikováno v:
Wear. 255:1040-1044
Total hip joint replacement is the major achievement in orthopedic surgery; zirconia and alumina have been widely used in the medical field due to their biocompatibility, excellent corrosion resistance, low friction, high wear resistance, high streng
Publikováno v:
Journal of the American Ceramic Society. 86:612-22
The structure and composition of sapphire bicrystal boundaries produced by liquid-phase sintering depended on the crystallographic misorientation of the crystals across the boundary and on the orientation of the boundary. Basal twist boundaries of 15
Autor:
Tae-Wook Roh, Yorinobu Takigawa, Dong-Soo Park, Yoshiyuki Yasutomi, Byung-Dong Han, Bernard J. Hockey, Hai-Doo Kim
Publikováno v:
Journal of the European Ceramic Society. 23:555-560
The microstructure of silicon nitride with aligned silicon nitride whisker seeds was examined by electron microscopy. Silicon nitride sintered with yttria and alumina showed a “core-rim” structure. A few grains of the sample sintered with yttria
Publikováno v:
Journal of Materials Research. 18:27-36
This work reports on the processes involved in the wear of hydroxyapatite sliding against slip-cast, glass-infiltrated alumina. Synthetic hydroxyapatite was used as a model material representing tooth enamel, while the alumina used was designed for t