Word: metalized
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Dates: during 1940-1949
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Windup to this hair-raising blitz was an attack by eleven speedy A20 light bombers, especially designed for smearing a target of wide area. They whipped over at 4,500 feet, dribbled 176 100-pounders from their bays. Across the target spouted a deadly line of dirt, metal, smoke; the second pyramid took off and floated into fragments...
...Current collector brushes for generators which combine the conductivity of copper with the lubricating properties of graphite. > Metal filters, with perhaps 50% porosity, which can be used, for example, in cleaning diesel fuels...
From Pills to Gears. Reason most powdered metal parts are small is that pressures of from five to 100 tons per square inch are needed to force the minute particles close enough together to become locked into a genuine solid. Thus a solid gear with a 4-in. diameter would have a top surface of twelve square inches and might require a pressure of as high as 400 to 1,200 tons. The largest presses now in use are of 80-ton capacity, although 400-ton, 600-ton, 800-ton machines are on order. The pressure needed can be lowered...
...individual dustlike particles in a cubic centimeter of metal powder may have a total surface of approximately 384,000 square centimeters, making a tremendous amount of surface energy available ; but even so the cold-pressed briquets are not very strong and can be easily broken by hand unless they are strengthened by sintering-consolidating heat treatment by baking at temperatures well below their melting points. This heat also shrinks the pressed part, in some cases very little, in others 20%. Yet in each metal the shrinkage is controllable enough so that parts can be made precise to within...
About five years ago Chrysler turned to powder metallurgy to make a door-latch part which would be 1) self-oiling, like a bearing, 2) quieter than clangy solid metal. Besides offering these advantages, this part surprised engineers by being easier and cheaper to make from powder than by former methods. From this and similar pressed parts a wave of interest in powder metallurgy at once swept U.S. industry. First powdered-metal automotive gear appeared in the oil pump of the 1940 Oldsmobile, and this year more new parts have been made from powders...