Oxidation Behavior of Si3N4 at Low Oxygen Partial Pressures.
نویسندگان
چکیده
منابع مشابه
OXIDATION OF C/SiC COMPOSITES AT REDUCED OXYGEN PARTIAL PRESSURES
T-300 carbon fibers and T-300 carbon fiber reinforced silicon carbide composites (C/SiC) were oxidized in flowing reduced oxygen partial pressure environments at a total pressure of one atmosphere (0.5 atm O2, 0.05 atm O2 and 0.005 atm O2, balance argon). Experiments were conducted at four temperatures (816°, 1149°, 1343°, and 1538°C). The oxidation kinetics were monitored using thermogravimetr...
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Corneas of 28 human subjects were exposed to oxygen partial pressures, in a gas goggle, of either 6.9, 17.1, or 22.2 mm Hg, and the corneal swelling was measured by pachometry for 4 hr. Following an initial rise, the swelling stabilized after about 3 hr; in many subjects it was reversed, indicating an adaptation process. The average corneal swelling after 4 hr for the three oxygen partial press...
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both cornea and conjunctiva occurred as early as 15 min after bacterial inoculation. By 1 to 3 hr after bacterial inoculation, shrinkage of corneal epithelial cells was pronounced (Fig. 5, a and b). Fewer microvilli were seen on the shrunken regions of these affected cells, and the cell surfaces appeared roughened and irregular. Additionally, intercellular junctions were dilated to 1.0 fim in d...
متن کاملInternal oxidation of Nb-Zr alloys over the range 1555-1768°C at low oxygen pressures
Three Nb alloys, containing 1 w/oZr, 2.5 w/oZr, and IOW-2.5Zr, were internally oxidized in the range of 1555 to 1768 O C at oxygen pressures ranging from 5 x to 1 x torr. Linear kinetics were measured suggesting that oxygen arrival at the surface and not oxygen diffusion in the substrate was rate controlling. Both tetragonal and monoclinic ZrOn formed, the tetragonal form being favored by high ...
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ژورنال
عنوان ژورنال: Journal of the Society of Materials Science, Japan
سال: 1996
ISSN: 1880-7488,0514-5163
DOI: 10.2472/jsms.45.694