Research keeps foundries competitive.Brass and bronze castings have been hard hit by imported castings and competition from plastics and some aluminum substitutions. But the copper base segment of the foundry industry has settled down. it has been working to improve its performance in product areas in which it can compete, such as in electrical connectors, water systems, plaques, giftware, and some hardware. New research into the further understanding of such items as feeding distances of aluminum bronze Noun 1. aluminum bronze - an alloy of copper and aluminum with high tensile strength and resistance to corrosion aluminium bronze copper-base alloy - any alloy whose principal component is copper , weldability, core and binder systems and the problems posed by lead were subjects of intense interest at the 95th Casting Congress. Authors M. Sahoo, A. Taylor and R. Dawson presented a paper detailing the welding characteristics of monels. Long a staple in the marine industry due to its resistance to seawater seawater Water that makes up the oceans and seas. Seawater is a complex mixture of 96.5% water, 2.5% salts, and small amounts of other substances. Much of the world's magnesium is recovered from seawater, as are large quantities of bromine. , monel is finding new favor as a material of choice for a wide variety of applications. These newer uses include the oil industry, particularly in the alkalation process used to manufacture non-leaded gasoline and in the pumping of older wells where a mixture of brine and oil make for a particularly harsh environment. Monel castings are prone to gas porosity Abstract Determining the true porosity of a gas filled formation has always been a problem. While gas is a hydrocarbon, similar to oil, the physical properties of the fluids are very different, making it very hard to correctly quantify the total amount of gas in a formation. , hot tearing and weld cracking. The authors discussed the availability of welding grade monel that contains niobium niobium (nīō`bēəm), metallic chemical element; symbol Nb; at. no. 41; at. wt. 92.9064; m.p. about 2,468°C;; b.p. 4,742°C;; sp. gr. 8.57 at 20°C;; valence +2, +3, +4, or +5. . Niobium increases the ability of silicon to increase yield strength and ultimate tensile strength and offsets the detrimental effects of impurities such as lead, tin, sulfur and phosphorous phos·pho·rous adj. Of, relating to, or containing phosphorus, especially with a valence of 3 or a valence lower than that of a comparable phosphoric compound. . J. Romero, R. Smith and M. Sahoo presented research showing that the feeding distances of molten aluminum bronze is strongly influenced by the gas and inclusion contents of the melt (91-156). The use of end chills in the mold cavity, degassing degassing (dēgas´ing), adj related to degasification, the process by which dissolved gas is removed from water or other liquid solutions. the melt and using filters in the gating system can increase the feeding distances. Reference to earlier research into the adverse effects of gas porosity on aluminum bronze mechanical properties prompted the new study into how gas porosity hinders the feeding of liquid metal through the dendrite dendrite: see nervous system; synapse. mesh during solidification and, thereby, reducing the feeding distance. |
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