The Hexagon, Volume 97, Number 2, Summer 2006

The Hexagon, Volume 97, Number 2, Summer 2006

Date: Summer 2006
Creator: Alpha Chi Sigma
Description: Quarterly publication of the Alpha Chi Sigma chemistry fraternity containing articles related to chemistry research and the activities of the organization, including local chapters and groups.
Contributing Partner: UNT Libraries
Rediscovery of the Elements: Aluminum

Rediscovery of the Elements: Aluminum

Date: Summer 2006
Creator: Marshall, James L., 1940- & Marshall, Virginia R.
Description: Article describing the history of aluminum, from its use in alum to its isolation. Tourist information is given regarding locations pertinent to aluminum.
Contributing Partner: UNT College of Arts and Sciences
An Assessment of Recycled Refractory Material Performance After Two Years of Service in a Carbon Bake Furnace

An Assessment of Recycled Refractory Material Performance After Two Years of Service in a Carbon Bake Furnace

Date: October 27, 1999
Creator: Schubert, N.; Bennett, J.P. & Kwong, K.S.
Description: Material removed from carbon bake furnaces used to manufacture anodes for the production of aluminum metal has historically been disposed by landfill. This material is composed primarily of 50% alumina refractory. in 1997, Alcoa completed a highly successful program to reuse the spent refractories in castables for carbon bake furnace headwalls and flooring, as roadbed aggregate, and in other internal applications. This program recycled/reused 11,000 metric tons of used refractory material (99% of the material removed from the carbon bake furnace) and saved Alcoa over 3.8 of the 9.6 million dollar projected furnace rebuild costs. As assessment is made of the performance of the recycled refractory components after two years of service.
Contributing Partner: UNT Libraries Government Documents Department
Optimization of Composition and Heat Treating of Die Steels for Extended Lifetime

Optimization of Composition and Heat Treating of Die Steels for Extended Lifetime

Date: January 30, 2002
Creator: Schwam, David; Wallace, John F. & Zhou, Quanyou
Description: An ''average'' die casting die costs fifty thousand dollars. A die used in making die cast aluminum engine blocks can cost well over one million dollars. These costs provide a strong incentive for extension of die life. While vacuum quenched Premium Grade H13 dies have become the most widely used in the United States, tool makers and die casters are constantly searching for new steels and heat treating procedures to extend die life. This project was undertaken to investigate the effects of composition and heat treating on die life and optimize these parameters.
Contributing Partner: UNT Libraries Government Documents Department
Cast Metal Coalition Research and Development Closeout Report

Cast Metal Coalition Research and Development Closeout Report

Date: August 1, 2000
Creator: Allen, D.
Description: The Cast Metal Coalition, composed of more than 22 research providers and universities and 149 industrial partners, has completed a four-year research and development partnership with the Department of Energy. This report provides brief summaries of the 29 projects performed by the Coalition. These projects generated valuable information in such aspects of the metals industry as process prediction technologies, quality control, improved alloys, product machinability, and casting process improvements.
Contributing Partner: UNT Libraries Government Documents Department
The Effect of Silicon and Aluminum Additions on the Oxidation Resistance of Lean Chromium Stainless Steels

The Effect of Silicon and Aluminum Additions on the Oxidation Resistance of Lean Chromium Stainless Steels

Date: September 2001
Creator: Dunning, J. S.; Alman, D. E. & Rawers, J. C.
Description: The effect of Si and Al additions on the oxidation of lean chromium austenitic stainless steels has been studied. A baseline composition of Fe-16Cr-16Ni-2Mn-1Mo was selected to allow combined Si and Al additions of up to 5 wt. pct. in a fully austenitic alloy. The baseline composition was selected using a net Cr equivalent equation to predict the onset of G-ferrite formation in austenite. Cyclic oxidation tests in air for 1000 hours were carried out on alloys with Si only or combined Si and Al additions in the temperature range 700 C to 800 C. Oxidation resistance of alloys with Si only additions were outstanding, particularly at 800 C. It was evident that different rate controlling mechanisms for oxidation were operative at 700 C and 800 C in the Si alloys. In addition, Si alloys pre-oxidized at 800 C, showed a zero weight gain in subsequent testing for 1000 hours at 700 C. The rate controlling mechanism in alloys with combined Si and Al addition for oxidation at 800 C was also different than alloys with Si only. SEM and ESCA analysis of the oxide films and base material at the oxide/base metal interface were conducted to study potential rate ...
Contributing Partner: UNT Libraries Government Documents Department
Laser Cutting and Size Reduction. Innovative Technology Summary Report

Laser Cutting and Size Reduction. Innovative Technology Summary Report

Date: September 2001
Creator: unknown
Description: The project utilizes a Neodymium Yttrium Aluminum Garnet (Nd:YAG) laser to cut and size reduce equipment in the 324 Laboratory B Hot Cell located at Pacific Northwest National Laboratory. This project will demonstrate the ability of the Nd:Yag laser to remotely and safely dismantle equipment faster, cheaper, and more efficiently than baseline cutting methods, such as the plasma torch and the water knife, in a highly radioactive area using fiber optics.
Contributing Partner: UNT Libraries Government Documents Department
Continuous Fiber Ceramic Composite (CFCC) Program: Gaseous Nitridation

Continuous Fiber Ceramic Composite (CFCC) Program: Gaseous Nitridation

Date: October 29, 2001
Creator: DiBona, R. Suplinskas G. & Grant, W.
Description: Textron has developed a mature process for the fabrication of continuous fiber ceramic composite (CFCC) tubes for application in the aluminum processing and casting industry. The major milestones in this project are System Composition; Matrix Formulation; Preform Fabrication; Nitridation; Material Characterization; Component Evaluation
Contributing Partner: UNT Libraries Government Documents Department
Final Report: Wetted Cathodes for Low-Temperature Aluminum Smelting

Final Report: Wetted Cathodes for Low-Temperature Aluminum Smelting

Date: September 30, 2002
Creator: Brown, Craig W.
Description: A low-temperature aluminum smelting process being developed differs from the Hall-Heroult process in several significant ways. The low-temperature process employs a more acidic electrolyte than cryolite, an alumina slurry, oxygen-generating metal anodes, and vertically suspended electrodes. Wetted and drained vertical cathodes are crucial to the new process. Such cathodes represent a significant portion of the capital costs projected for the new technology. Athough studies exist of wetted cathode technology with Hall-Heoult cells, the differences make such a study desirable with the new process. This project is such a study. In Phase 1, titanium diboride, zirconium diboride and composites of these with other materials were tested using a statistically useful test matrix. The materials were consolidated both by hot pressing and by a new method, plasma pressure compaction (P2C�). The materials were subject to controlled electrolysis tests under conditions of the low-temperature smelting process. Post-electrolysis characterizations included quantitative atomic analyses and electron microscopic examinations. These methods allowed evaluating the relative merits of the materials, and the mechanisms of their corrosion. Also, a few tests were performed to determine whether oxygen and carbon dioxide bathing vertically suspended cathodes exhibited different current efficiencies. In Phase 2, additional composite materials were fabricated with P2C�, ...
Contributing Partner: UNT Libraries Government Documents Department
High-Efficiency, High-Capacity, Low-NOx Aluminum Melting Using Oxygen-Enhanced Combustion

High-Efficiency, High-Capacity, Low-NOx Aluminum Melting Using Oxygen-Enhanced Combustion

Date: June 2, 2000
Creator: D'Agostini, M. D.
Description: This report describes the development and application of a novel oxygen enhanced combustion system with an integrated vacuum swing adsorption (VSA) oxygen supply providing efficient, low NOx melting in secondary aluminum furnaces. The mainstay of the combustion system is a novel air-oxy-natural gas burner that achieves high productivity and energy efficiency with low NOx emissions through advanced mixing concepts and the use of separate high- and low-purity oxidizer streams. The technology was installed on a reverberatory, secondary aluminum melting plant at the Wabash Aluminum Alloy's Syracuse, N.Y. plant, where it is currently in operation. Field testing gave evidence that the new burner technology meets the stringent NOx emissions target of 0.323 lb NO2/ton aluminum, thus complying with regulations promulgated by Southern California's South Coast Air Quality Management District (SCAQMD). Test results also indicated that the burner technology exceeded fuel efficiency and melting capacity goals. Economic modeling showed that the novel air-oxy-fuel (ADF) combustion technology provides a substantial increase in furnace profitability relative to air-fuel operation. Model results also suggest favorable economics for the air-oxy-fuel technology relative to a full oxy-fuel conversion of the furnace.
Contributing Partner: UNT Libraries Government Documents Department
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