Fused slurry

Protection of niobium and its alloys from oxidation in air is accomplished by coating, e.g. with zinc deposited by holding in zinc vapour at 865°C or coating with a layer of chemically stable oxide, nitride or silicide. Silicide coatings applied by pack cementation, fused slurry or by electrolytic methods have been found to be one of the most effective means of preventing oxidation of the metal. 

Priceman, C. and Soma, L., Development of Fused Slurry Silicide Coatings for the Elevated Temperature Oxidation Protection of Niobium and Tantalum Alloys, Report AFML-TR-68-210, Sylvania Electric Products Inc., Dec. (1968)... 

Fig. 4.3 Situation of fused slurry flowing into the cooling trough during preparation of fused iron catalyst...

Metal powder—glass powder—binder mixtures are used to apply conductive (or resistive) coatings to ceramics or metals, especially for printed circuits and electronics parts on ceramic substrates, such as multichip modules. Multiple layers of aluminum nitride [24304-00-5] AIN, or aluminay ceramic are fused with copper sheet and other metals in powdered form. The mixtures are appHed as a paste, paint, or slurry, then fired to fuse the metal and glass to the surface while burning off the binder. Copper, palladium, gold, silver, and many alloys are commonly used. 

Dana2ol was prepared from 4.32 grams of 17a-ethynyl-2-hydroxymethylene-4-androsten-17(3-ol-3-one, 1.00 gram of hydroxylamine hydrochloride, 1.12 grams of fused sodium acetate and 135 ml of acetic acid. To a 500 ml, 3-necked flask, equipped with a sealed Hershberg-type stirrer, a reflux condenser and a stopper, was added the above androstenone derivative in 300 ml of 95% ethanol. Stirring was commenced and a slurry of fused sodium acetate and hydroxylamine hydrochloride in glacial acetic acid was added. 

After drying the applied slurry, the enamel is fused onto sheet steel at about 8(X)-850°C for about 4-5 min. For cast iron a longer time and lower temperature are normal. 

In preparing the second edition of this book the opportunity has been taken to add sections on slurry explosives and a short account of Nonel fuse. Parts which were badly out of date have been modernised, and the opportunity taken to correct some errors and ambiguities. Thanks are again due to my former colleagues in NEC. 

Si No 2 fuel oil 5.5% requires at least 20% of AN particles to be less than 200 mesh. The min diam of the blast hole for these mixts is approx 20mm. A mixt of AN 60 NaNOg 40% formulated with.6% oil has a 60% increase in expl power. Surface-active agents (0.5%) have possible benefits in increasing expl power. Increased power can be obtd by slurrying with water but stronger fuses are reqd for deton]... 

To date, the best results obtained for an iron catalyst in a slurry reactor have been reported by Kolbel with a precipitated iron catalyst promoted with potassium and copper.2 Current efforts in our laboratory have been aimed at developing a catalyst with activity and productivity superior to the catalyst used by Kolbel. Most research efforts have focused on precipitated and fused iron catalysts however, promising results have been reported for... 

Figure 4.2. Carbon released as C02 from unamended soil and soils amended with pig slurry (PS), poultry manure (PM), cattle farmyard manure (FYM), aerobic sewage sludge (SS), municipal solid waste fuse compost (RC), and rye straw (RS) at a rate of lOgkg1 during incubation at 22 °C. Reprinted from Levi-Minzi, R., Riffaldi, R., and Saviozzi, A. (1990). Carbon mineralization in soil amended with different organic materials. Agric. Ecosyst. Environ. 31, 325-335, with permission from Elsevier.

The strange carbon blast was produced by binary star 4U 1820-30, which consists of a dwarf star orbiting a neutron star. Gas from the dwarf flows in a spiral pattern around the neutron star. When some of the dwarf s gas collides with the neutron star s surface, a compressed slurry of hydrogen and helium is formed. Pressures and temperatures can get sufficiently high in the slurry layer that the elements flash-fuse in a thermonuclear explosion. Each blast leaves carbon, one of the byproducts of helium fusion. Gradually a layer of carbon several hundred meters thick reaches a critical temperature and ignites a carbon bomb that rages for hours. [For more information, see Robert Irion, Astronomers spot their first carbon bomb, Science 290(5495) 1279 (November 17, 2000).]... 

Bureau of Mines studies by M. D. Schlesinger, now in progress, indicate that nitrided fused iron catalysts operate successfully in the slurry process with about the same selectivity as observed in the fixed-bed tests. 

Sasol Sasolburg, South Africa Initially coal, currently natural gas Fused Fe/K Precipitated Fe/K Precipitated Fe/K (spray dried) Circulating fluidised bed Multi-tubular fixed bed Slurry phase reactor 1955-ca. 1985 1955 1 1993 J 5 000... 

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