Showing papers by "Kaiser Aluminum published in 1988"
TL;DR: The HSCAS, when added to the diet of Leghorn and broiler chicks at a level of .5%, significantly diminished the adverse effects of feeding 7.5 mg AFB1/kg of feed, suggesting this agent (and other aluminosilicate congeners) may prove effective in the preventive management of aflatoxicosis.
341 citations
TL;DR: Aluminum has been the dominant material in the aircraft industry for a half century due to its attractive combination of light weight, strength, ductility, corrosion resistance, ease of assembly and low cost as mentioned in this paper.
33 citations
TL;DR: In this paper, the authors reviewed the stress corrosion characteristics of Al-2.7%Cu 2.2%Li AA 2090 alloy with specific reference to results on smooth and precracked specimens exposed to laboratory (3 1/2% NaCl) and marine atmosphere environments.
Abstract: The stress corrosion (SC) characteristics of Al-2.7%Cu-2.2%Li AA 2090 alloy are reviewed with specific reference to results on smooth and precracked specimens exposed to laboratory (3 1/2% NaCl) and marine atmosphere environments. In the underaged condition, the alloy is susceptible to SC cracking in both the “easy path,” short-transverse direction and the more tortuous long-transverse orientation. Resistance improves significantly upon aging to near peak-strength conditions, with the long-transverse orientation being virtually immune. Underaged material is also susceptible to intergranular and intersubgranular corrosion; attack in the near peak-aged condition is of a pit fissuring nature. Attempts are made to reconcile smooth and precracked specimen results and to explain SC response to aging on the basis of microstructural features.
27 citations
16 citations
Patent•
13 Apr 1988TL;DR: In this article, an aluminum-lithium alloy production system is described, where a plunger at a predetermined volumetric rate is used to advance a body of molten lithium toward an overflow port through which it is fed into a mixing vessel where it is combined with molten aluminum.
Abstract: Lithium feed to an aluminum-lithium alloy production system is achieved at a highly controlled rate by advancing a plunger at a predetermined volumetric rate into a body of molten lithium retained in a holding vessel to displace the lithium toward an overflow port through which it is fed into a mixing vessel where it is combined with molten aluminum. Control of the aluminum feed rate is achieved by maintaining a constant head height upstream of an orifice. The thus metered streams of molten lithium and aluminum are then combined in a vortex bowl, whose outlet is then fed to a casting station.
14 citations
Patent•
02 Feb 1988TL;DR: In this article, a magnetic memory disk substrate which maintains a high degree of surface smoothness together with high yield strength is prepared by cladding a core material with a cladding layer containing a maximum of about 3% magnesium.
Abstract: A magnetic memory disk substrate which maintains a high degree of surface smoothness together with high yield strength is prepared by cladding a core material with a cladding layer containing a maximum of about 3% magnesium. The core material is aluminum alloyed with one or more elements such as zinc, magnesium, copper and silicon to produce an improved yield strength. The cladding comprises from about 3% to about 10% per side of the thickness of the entire composite and generally contains further alloying elements for enhanced corrosion resistance. Silicon impurities generally amount to less than 0.5%.
9 citations
Patent•
20 Jan 1988TL;DR: In this article, a process of producing aluminum fluoride from aluminum hydroxide or alumina hydrate and hydrogen fluoride in a circulating fluidized bed system including a fluidized-bed reactor, a cyclone separator and a recycling line is described.
Abstract: 1. A process of producing aluminum fluoride from aluminum hydroxide or alumina hydrate and hydrogen fluoride in a circulating fluidized bed system including a fluidized bed reactor, a cyclone separator and a recycling line, characterized in that partly reacted aluminum hydroxide circulated in a cooling cycle is added to fresh aluminum hydroxide or alumina hydrate in a first stage, in which the aluminum hydroxide is contacted with the hydrogen fluoride-containing exhaust gases from the circulating fluidized bed system so as to form a gas-solids suspension at a temperature of 150 to 250 degrees C, whereafter the solids are collected from the gas stream, at least part of the collected solids are passed through a cooler, cooled solids are re-contacted with fresh aluminum hydroxide or alumina hydrate, and a partial stream of the collected solids is supplied to the circulating fluidized bed system and is reacted therein at a temperature of at least 450 degrees C with hydrogen fluoride supplied in the form of a gas in a concentration up to 25 vol. %.
2 citations
TL;DR: In this paper, practical equations for computing the relative reactivities of heterogeneous catalysts from measured properties of their porosity have been developed, which adapt to diffusion and catalysis in ordinary gaseous and liquid systems, and to several characteristic limitations on kinetics.
Abstract: Practical equations are developed for computing the relative reactivities of heterogeneous catalysts from measured properties of their porosity. These equations adapt to diffusion and catalysis in ordinary gaseous and liquid systems, respectively, and to several characteristic limitations on kinetics. Included functions deal with pore sizes approaching those of the participating molecules. Precision of the equations is confirmed to ~10% r.m.s. deviation by experimental fixed-bed reactivity data for 28 real catalysts of widely different porosity characteristics; five chemical reactions were included, three in gaseous and two in liquid media, under various test reactor operating conditions. Predictive use of these equations for evaluation and design of catalyst microstructures is suggested.