Search Results for sulfidation

Fig. 5 Sulfidation penetration into IN-690 liner approximately 50 to 250 μm deep. The sulfidized weakened structure of the alloy has led to cracking. More

Fig. 7 Sulfidation and chloridation attack on nickel alloy of charcoal-regeneration kiln. See also Fig. 8 . Region 1 is an area of chromium sulfide islands (dark phase) interspersed in chromium-depleted region (bright phase). Region 2 has angular phase (consisting mostly of nickel sulfide More

Fig. 8 Sulfidation and chloridation attack on nickel alloy of charcoal-regeneration kiln, with greater magnification (at ∼44×). Lower right is region of chromium sulfide islands (dark phase) interspersed in chromium-depleted region (bright phase). Middle region has angular phase (consisting More

Fig. 6 Collective plot of the temperature dependence of the sulfidation and oxidation rate of binary and ternary alloys and coatings. Source: Ref 19 More

Fig. 9 Example of high-temperature sulfidation attack in a type 310 heat-exchanger tube after ∼100 h at 705°C (1300 °F) in coal-gasifier product gas More

Fig. 11 Sulfidation attack of alloy 800 test coupons exposed to a coal-gasifier environment ( p O 2 = 3 × 10 −20 atm and p S 2 = 1 × 10 −7 atm) at 870 °C (1600 °F) for 100 h. (a) and (b) Macrograph and micrograph, respectively, of a test coupon with a 0.254 mm More

Fig. 3 Sulfidation data of cobalt-base alloys 25 and 188 relative to selected nickel-base alloys at 980 °C (1800 °F) More

Fig. 5 Sulfidation penetration into IN-690 incinerator liner approximately 50 to 250 μm deep. The sulfidized weakened microstructure of the alloy led to cracking. Courtesy of U.S. Navy More

Fig. 6 More detailed view of sulfidation of IN-690 incinerator liner ( Fig. 5 ) shows formation of chromium sulfides (gray areas, such as marked by arrow) along the surface, caused by diffusion of sulfur species along the grain boundaries. Sulfide concentration decreases with depth due More

Fig. 7 Sulfidation and chloridation attack on IN-601 nickel-base alloy of charcoal-regeneration kiln (see also Fig. 8 ). Region 1 is an area of chromium sulfide islands (dark phase) interspersed in a chromium-depleted region (bright phase). Region 2 has an angular phase (consisting mostly More

Fig. 8 Sulfidation and chloridation attack on IN-601 nickel-base alloy of charcoal-regeneration kiln at higher magnification (~44×). Lower right is region of chromium sulfide islands (dark phase) interspersed in chromium-depleted region (bright phase). Middle region has an angular phase More

Fig. 17 Sulfidation behavior of type 347 stainless steel, alloy 800H, alloy HR-120, alloy 556, and alloy HR-160 in H 2 -7%CO-1.5%H 2 O-0.6%H 2 S (oxygen potential, P O 2 =10 −23 atm; sulfur potential, P S 2 =10 −9 atm; carbon activity, a c =0.3–0.4). Source: Ref 45 More

Fig. 2 Catastrophic sulfidation of an Inconel 601 furnace tube. The furnace atmosphere was contaminated with sulfur; the component failed after less than 1 month at 925 °C (1700 °F). (a) General view. (b) Cross section of the perforated area showing liquid-appearing nickel-rich sulfides. (c More

Fig. 8 Sulfidation data of Haynes alloys 25 and 188 relative to selected nickel-base alloys at 980 °C (1800 °F) More

Fig. 5 Thermogravimetric test data for sulfidation of Ni 3 Al at 875 °C (1605 °F). Source: Ref 3 More

Fig. 14 Sulfidation kinetics for Ti-54Al at 900 °C (1650 °F) for three mixed gases. Partial pressure ( p O 2 ), 10 −14 Pa. Partial pressures ( p S 2 ): diamond, 0.0016 Pa; square, 0.11 Pa; triangle, 1.6 Pa. Source: Ref 91 More

Fig. 15 Sulfidation kinetics for Ti-48Al-2Nb-2Mn at 900 °C (1650 °F) for three mixed gases. Partial pressure ( p O 2 ), 10 −14 Pa. Partial pressure ( p S 2 ): diamond, 0.0016 Pa; square, 0.11 Pa; triangle, 1.6 Pa. Source: Ref 91 More

Fig. 17 Weight-change data during (a) oxidation in air and (b) sulfidation in 1.5 vol% H 2 S/H 2 gas mixture for boron-containing Mo 5 Si 3 after exposure at several temperatures. Source: Ref 100 More

Fig. 18 SEM micrographs of surface of boron-containing Mo 5 Si 3 after sulfidation in 1.5 vol% H 2 /H 2 S gas mixture at (a) 500 °C (930 °F), (b) 800 °C (1470 °F), and (c) 1100 °C (2010 °F). Source: Ref 100 More

Fig. 19 Oxidation and sulfidation of silicides at 850 °C (1560 °F). Source: Ref 109 More