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in subjects: "extrusion"

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Development of Techniques for Fabrication of Small-Diameter Thin-Wall Tungsten Tubing: Interim Progress Report covering the period from July 1, 1963 through December 31, 1963

Report describing the methods and equipment used to extrude tungsten tubing from various starting materials.

Date: 1964

Creator: Burt, W. R., Jr.; Katiyar, H. C. & Mayfield, R. M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

A study on the formation of as-fabricated porosity in U{sub 3}Si{sub 2} aluminum dispersion fuels

Fabrication Porosity in U{sub 3}Si{sub 2}-Al dispersion fuel plates and rods has been systematically studied for comminuted and atomized U{sub 3}Si{sub 2} powders. A minimum amount of porosity is formed when the maximum fuel particle size is reduced and 40--50% of fines are included in the fuel powder. Atomized (spherical) fuel particles are particularly suited to the extrusion process.

Date: December 1, 1995

Creator: Hofman, G.L.; Wiencek, T.C.; Koster van Groos, S.A.; Kim, Ki-Hwan; Lee, Chong-Tak & Kim, Chang-Kyu

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Dense ceramic membranes for converting methane to syngas

Dense mixed-oxide ceramics capable of conducting both electrons and oxygen ions are promising materials for partial oxygenation of methane to syngas. We are particularly interested in an oxide based on the Sr-Fe-Co-O system. Dense ceramic membrane tubes have been fabricated by a plastic extrusion technique. The sintered tubes were then used to selectively transport oxygen from air through the membrane to make syngas without the use of external electrodes. The sintered tubes have operated for >1… more

Date: July 1, 1995

Creator: Balachandran, U.; Dusek, J. T.; Picciolo, J. J.; Ma, B.; Maiya, P. S.; Mieville, R. L. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Polyethylene encapsulation full-scale technology demonstration. Final report

A full-scale integrated technology demonstration of a polyethylene encapsulation process, sponsored by the US Department of Energy (DOE) Office of Technology Development (OTD), was conducted at the Environmental & Waste Technology Center at Brookhaven National Laboratory (BNL.) in September 1994. As part of the Polymer Solidification National Effort, polyethylene encapsulation has been developed and tested at BNL as an alternative solidification technology for improved, cost-effective treatment… more

Date: October 1, 1994

Creator: Kalb, P. D. & Lageraaen, P. R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Development of oxide fibrous monolith systems.

Fibrous monolithic ceramics generally have a cellular structure that consists of a strong cell surrounded by a weaker boundary phase [1-5]. Fibrous monoliths (FMs) are produced from powders by conventional ceramic fabrication techniques, such as extrusion [1,2]. When properly engineered, they exhibit fail gracefully [3-5]. Several compositions of ceramics and cermets have been processed successfully in fibrous monolithic form [4]. The most thoroughly investigated fibrous monolith consists of Si… more

Date: March 2, 1999

Creator: Goretta, K. C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

CE IGCC Repowering Project: Use of the Lockheed Kinetic Extruder for coal feeding; Topical report, June 1993

ABB CE is evaluating alternate methods of coal feed across a pressure barrier for its pressurized coal gasification process. The Lockheed Kinetic Extruder has shown to be one of the most promising such developments. In essence, the Kinetic Extruder consists of a rotor in a pressure vessel. Coal enters the rotor and is forced outward to the surrounding pressure vessel by centrifugal force. The force on the coal passing across the rotor serves as a pressure barrier. Should this technology be succ… more

Date: February 1, 1994

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Review of potential processing techniques for the encapsulation of wastes in thermoplastic polymers

Thermoplastic encapsulation has been extensively studied at Brookhaven National Laboratory`s (BNL) Environmental and Waste Technology Center (EWTC) as a waste encapsulation technology applicable to a wide range of waste types including radioactive, hazardous and mixed wastes. Encapsulation involves processing thermoplastic and waste materials into a waste form product by heating and mixing both materials into a homogeneous molten mixture. Cooling of the melt results in a solid monolithic waste … more

Date: August 1, 1995

Creator: Patel, B. R.; Lageraaen, P. R. & Kalb, P. D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Yucca Mountain project container fabrication, closure and non-destructive evaluation development activities; Summary and viewgraphs

In this presentation, container fabrication, closure, and non-destructive evaluation (NDE) process development activities are described. All of these activities are interrelated, and will contribute to the metal barrier selection activity. The plan is to use a corrosion-resistant material in the form of a cylinder with a wall thickness of {approximately}1cm (2cm for pure copper.) The materials under consideration include the three austenitic alloys: stainless steel-304L, stainless steel-316L an… more

Date: June 1989

Creator: Russell, E. W. & Nelson, T. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Oxide Dispersion Strengthened Fe(sub 3)Al-Based Alloy Tubes: Application Specific Development for the Power Generation Industry

A detailed and comprehensive research and development methodology is being prescribed to produce Oxide Dispersion Strengthened (ODS)-Fe3Al thin walled tubes, using powder extrusion methodologies, for eventual use at operating temperatures of up to 1100C in the power generation industry. A particular 'in service application' anomaly of Fe3Al-based alloys is that the environmental resistance is maintained up to 1200C, well beyond where such alloys retain sufficient mechanical strength. Grain boun… more

Date: July 1, 1999

Creator: Kad, B.K.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Development of a Tritium Extruder for ITER Pellet Injection

As part of the International Thermonuclear Experimental Reactor (ITER) plasma fueling development program, Oak Ridge National Laboratory (ORNL) has fabricated a pellet injection system to test the mechanical and thermal properties of extruded tritium. Hydrogenic pellets will be used in ITER to sustain the fusion power in the plasma core and may be crucial in reducing first-wall tritium inventories by a process of "isotopic fueling" in which tritium-rich pellets fuel the burning plasma core and … more

Date: September 1, 1998

Creator: Gouge, M. J. & Fisher, P. W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

An inverse problem by boundary element method

Boundary Element Methods (BEM) have been established as useful and powerful tools in a wide range of engineering applications, e.g. Brebbia et al. In this paper, we report a particular three dimensional implementation of a direct boundary integral equation (BIE) formulation and its application to numerical simulations of practical polymer processing operations. In particular, we will focus on the application of the present boundary element technology to simulate an inverse problem in plastics p… more

Date: February 1, 1996

Creator: Tran-Cong, T.; Nguyen-Thien, T. & Graham, A. L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Alternative processing methods for tungsten-base composite materials

Tungsten composite materials contain large amounts of tungsten distributed in a continuous matrix phase. Current commercial materials include the tungsten-nickel-iron with cobalt replacing some or all of the iron, and also tungsten-copper materials. Typically, these are fabricated by liquid-phase sintering of blended powders. Liquid-phase sintering offers the advantages of low processing costs, established technology, and generally attractive mechanical properties. However, liquid-phase sinteri… more

Date: December 31, 1995

Creator: Ohriner, E. K. & Sikka, V. K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Tritium projectiles for fueling magnetic fusion plasmas

As part of the International Thermonuclear Engineering Reactor (ITER) plasma fueling development program, Oak Ridge National Laboratory (ORNL) has fabricated a pellet (cylindrical projectile of frozen hydrogenic gas at a temperature in the range 6--16 K) injection system to test the mechanical and thermal properties of extruded tritium, a radioactive isotope of hydrogen. This repeating, single-stage, pneumatic injector, called the Tritium-Proof-of-Principle Phase 2 (TPOP-2) Pellet Injector, has… more

Date: December 1995

Creator: Fisher, P. W. & Gouge, M. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Extrusion of tritium and D-T pellets for ITER fueling

As part of the International Thermonuclear Engineering Reactor (ITER) plasma fueling development program, Oak Ridge National Laboratory (ORNL) has fabricated a pellet injection system to test the mechanical and thermal properties of extruded tritium. This repeating, single-stage, pneumatic injector, called the Tritium-Proof-of-Principle Phase II (TPOP-II) Pellet Injector, has a piston-driven mechanical extruder and is designed to extrude and accelerate hydrogenic pellets sized for the ITER devi… more

Date: July 1, 1996

Creator: Fisher, P. W.; Gouge, M. J. & Denny, B. J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

The Oxidation Behavior of ODS Iron Aluminides

Oxide-dispersed Fe-28at.%Al-2%Cr alloys were produced by a powder metallurgy technique followed by hot extrusion. A variety of stable oxides were added to the base alloy to assess the effect of these dopants on the oxidation behavior at 1200{degrees}C in air and O{sub 2}. An Al{sub 2}O{sub 3} dispersion flattened the {alpha}-Al{sub 2}O{sub 3} scale, but produced none of the other reactive element effects and had an adverse influence on the long-term oxidation behavior. A Y{sub 2}O{sub 3} disper… more

Date: May 1, 1996

Creator: Pint, B. A.; Tortorelli, P. F. & Wright, I. G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Coal log pipeline research at University of Missouri. 3rd quarterly report for 1995, July 1, 1995--September 30, 1995

During this quarter (1/1/95-9/30/95), major progress has been made in the following areas of coal log pipeline research, development and technology transfer: (1) Conceptual design of a test machine based on hydraulic presses to mass-produce 5.4-inch-diameter coal logs for testing in a 6-inch-diameter pipeline has been completed. (2) Conceptual design of a rotary-press machine to produce 1.9-inch-diameter coal logs for testing in a 2-inch-diameter pipeline has also been completed. (3) It has bee… more

Date: December 31, 1995

Creator: Liu, H.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Diffusive mesh relaxation in ALE finite element numerical simulations

The theory for a diffusive mesh relaxation algorithm is developed for use in three-dimensional Arbitary Lagrange/Eulerian (ALE) finite element simulation techniques. This mesh relaxer is derived by a variational principle for an unstructured 3D grid using finite elements, and incorporates hourglass controls in the numerical implementation. The diffusive coefficients are based on the geometric properties of the existing mesh, and are chosen so as to allow for a smooth grid that retains the gener… more

Date: June 1, 1996

Creator: Dube, Eveline I.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Interparticle movement and the mechanical behavior of extruded powder aluminum at elevated temperature

This paper proposes a model and mechanism, based on relative motion of the extruded aluminum particles, to explain these effects. Quantitative stereology is used to support the concept. Stress-strain relations are derived for the uniaxial and biaxial behavior of powder aluminum and they are seen to fit the data from a number of uniaxial and tension-torsion test specimens. Implications of the model for forming of extruded powder metal products are discussed

Date: September 1, 1996

Creator: Peacock, H.B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Processing and properties of extruded tungsten-hafnium and tungsten-steel composites

The purpose of this study was to evaluate the processing behavior and properties of tungsten-hafnium (W-Hf) and W-steel composites produced by hot extrusion of canned powders. The W-Hf composite was consolidated by extrusion of blended powders with preheat temperatures over the temperature range of 1100 to 1400{degrees}C. All extrusions produced fully dense material which exhibits elongation of the tungsten phase within the hafnium matrix. The flow stress, as characterized by the extrusion cons… more

Date: February 1, 1995

Creator: Ohriner, E. K.; Sikka, V. K. & Kapoor, D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Hydrostatic extrusion of BSCCO/Ag composite wire

The application of hydrostatic extrusion processing to composite wire fabrication offers several advantages over conventional reduction techniques. These include enhanced uniformity, increased reduction capability, and successful extrusion of normally brittle materials. Specifically, this work involved an experiment to screen the effects of seven extrusion process parameters on the uniformity and density of as-extruded BSCCO-core wire, and the required extrusion pressure. Results suggest the fo… more

Date: March 1, 1995

Creator: Bingert, John F.; Bingham, Barry L.; Sebring, Robert J. & Kelly, Ann M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Key microstructures controlling the mechanical properties of two-phase TiAl alloys with lamellar structures

TiAl alloys with the base composition of Ti-47Al-2Cr-2Nb (at.%) were prepared by arc melting and drop casting, followed by hot extrusion above the {alpha}-transus temperature, T{sub {alpha}}. The hot extruded materials were then heat treated above and below T{sub {alpha}} in order to control microstructural features in these lamellar structures. Mechanical properties of these alloys were determined by tensile testing at temperatures to 1000 C. Tensile elongation at room temperature (RT) is stro… more

Date: December 31, 1996

Creator: Liu, C. T.; Maziasz, P. J. & Wright, J. L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Sodium Heat Engine Development Program

The Sodium Heat Engine (SHE) is an efficient thermoelectric conversion device which directly generates electricity from a thermally regenerative electrochemical cell that relies on the unique conduction properties of {beta}{double prime}-alumina solid electrolyte (BASE). Laboratory models of a variety of SHE devices have demonstrated the feasibility and efficiency of the system, engineering development of large prototype devices has been slowed by a series of materials and fabrication problems.… more

Date: January 1992

Creator: Singh, J. P.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Waste behavior during horizontal extrusion: Effect of waste strength for bentonite and kaolin/ludox simulants and strength estimates for wastes from Hanford waste tanks 241-SY-103, AW-101, AN-103, and S-102

The Hanford Site has 149 single-shell tanks (SSTs) and 28 double-shell tanks (DSTs) containing radioactive wastes that are complex mixes of radioactive and chemical products. Some of these wastes are known to generate mixtures of flammable gases, including hydrogen, nitrous oxide, and ammonia. Nineteen of these SSTs and six of the DSTs have been placed on the Flammable Gas Watch List because they are known or suspected, in all but one case, to retain these flammable gases. Because these gases a… more

Date: October 1, 1997

Creator: Gauglitz, P. A. & Aikin, J. T.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Particle characterization. Quarterly report October--December, 1970

In the manufacture of Extex (XTX 8003, 80% PETN, 20% Sylgard silicone rubber), the formulation is mixed for about five hours. Freon MF is added in the proportions of fur pounds Extex to one quart Freon, to enhance the mixing at lower power than would otherwise be the case. After mixing, the formulation is milled on a three-roll rubber mill for a total of 25 passes. The study of the effects of roll milling on Extex was started; the visual results are indicative that a considerable reduction in c… more

Date: December 31, 1970

Creator: Duncan, A. A.

Item Type: Report

Partner: UNT Libraries Government Documents Department