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Displaying 1 - 22 of 22

Vacuum-Assisted Gas Atomization of Liquid Metal

October 17, 2012
Author(s)
Steven Mates, Stephen D. Ridder, Frank S. Biancaniello, Tony Zahrah
Vacuum-assisted gas atomization of liquid metal is explored. The investigation is motivated by observations of liquid metal atomization which indicate that secondary atomization is sustained over an extended distance from the nozzle tip. Increasing the

The Effect of Swirl on Gas Velocity Decay in a Generic Annular Close-Coupled Nozzle

December 1, 2003
Author(s)
Steven P. Mates, Frank S. Biancaniello, Stephen D. Ridder
Introducing swirl into the gas flow generated by close-coupled nozzles has long been suggested as a means to improve melt disintegration near the nozzle tip. However, adding swirl may have unintended negative consequences on atomization performance by

Structure and Properties of Consolidated Amorphous Metal Powder

March 1, 2003
Author(s)
Frank S. Biancaniello, Tony Zahrah, Rodney D. Jiggetts, L J. Rowland, Steven P. Mates, Stephen D. Ridder, S Glasmachers
Amorphous metal alloys have been developed with sufficiently slow crystallization kinetics to allow the casting of bulk metallic glass (BMG) components up to several centimeters in cross section. Mechanical characterization of these castings has shown that

An Alternate View of Close-Coupled Gas Atomization of Liquid Metals

January 1, 2002
Author(s)
Steven P. Mates, Frank S. Biancaniello, Stephen D. Ridder
The production of metal powders by close-coupled inert gas atomization is a complex process that has yet to be understood to the degree necessary that nozzle geometry and processing conditions can be chosen easily to adequately control particle size

Measurement and Control of Metal Flow-Rate in a Gas-Metal Atomizer

January 1, 2002
Author(s)
Stephen D. Ridder
Research at NIST on the production of metal powder by gas atomization has focused on the development of sensors for use in PC based control systems. The ultimate goal is an inexpensive, robust means to automate the process that will improve powder quality

The Performance of a Nanocrystalline Tungsten Composite in Ballistic Impacts

September 1, 2001
Author(s)
L S. Magness, L Kesckes, Frank S. Biancaniello, Stephen D. Ridder, M Chung, D Kapoor
A novel tungsten heavy alloy with a nanocrystalline microstructure was produced. Tungsten powders were ball milled in a controlled atmosphere environment, with rapidly solidified powders of a binder alloy known to exhibit a stress-induced martensitic

Abstracts for the MSEL Assessment Panel, March 2001

January 26, 2001
Author(s)
Leslie E. Smith, Alamgir Karim, Leonid A. Bendersky, C Lu, J J. Scott, Ichiro Takeuchi, Kathleen M. Flynn, Vinod K. Tewary, Davor Balzar, G A. Alers, Stephen E. Russek, Charles C. Han, Haonan Wang, William E. Wallace, Daniel A. Fischer, K Efimenko, Wen-Li Wu, Jan Genzer, Joseph C. Woicik, Thomas H. Gnaeupel-Herold, Henry J. Prask, Charles F. Majkrzak, Norman F. Berk, John G. Barker, Charles J. Glinka, Eric K. Lin, Ward L. Johnson, Paul R. Heyliger, David T. Read, R R. Keller, J Blendell, Grady S. White, Lin-Sien H. Lum, Eric J. Cockayne, Igor Levin, C E. Johnson, Maureen E. Williams, Gery R. Stafford, William J. Boettinger, Kil-Won Moon, Daniel Josell, Daniel Wheeler, Thomas P. Moffat, W H. Huber, Lee J. Richter, Clayton S. Yang, Robert D. Shull, R A. Fry, Robert D. McMichael, William F. Egelhoff Jr., Ursula R. Kattner, James A. Warren, Jonathan E. Guyer, Steven P. Mates, Stephen D. Ridder, Frank S. Biancaniello, D Basak, Jon C. Geist, Kalman D. Migler
Abstracts relating to research and development in the NIST Materials Science and Engineering Laboratory (MSEL) are presented for a poster session to be presented to the 2001 MSEL Assessment Panel.

Optimization of an Annular Jet Commercial Gas-Metal Atomizer

December 1, 2000
Author(s)
Stephen D. Ridder, Aaron N. Johnson, Pedro I. Espina, Frank S. Biancaniello, G J. DelCorso
The performance of a commercial gas-metal atomizer was studied using a number of previously published research techniques. initially the flow was visualized using schlieren photography to determine the location of important flow features (e.g., shock waves

In-Flight Measurement of Thermal Spray Particle Temperatures Using Two-Color Optical Pyrometry

October 11, 2000
Author(s)
Frank S. Biancaniello, Steven P. Mates, Stephen D. Ridder, D Basak, D W. Bonnell, Jon C. Geist
Thermal spray is a materials processing technique used to deposit coatings to provide improved wear, corrosion, and/or thermal protection for engineering components. Thick (>10 {micro}m) thermal spray coatings are made up of individual solidified splats

Behavior and Performance of Amorphous and Nanocrystalline Metals in Ballistic Impacts

September 1, 2000
Author(s)
L S. Magness, L Kesckes, M Chung, D Kapoor, Frank S. Biancaniello, Stephen D. Ridder
Depleted uranium alloys that exhibit adiabetic shear localization and failure resulting in a self-sharpening mecanism offer superior armor penetration capability when compared to conventional tungsten heavy alloys. Both amorphous and nanocrystalline metals

Powder Metallurgy High Nitrogen Stainless Steel

December 1, 1999
Author(s)
Frank S. Biancaniello, Rodney D. Jiggetts, Richard E. Ricker, Stephen D. Ridder
High Nitrogen Stainless Steels (HNSS) are a class of materials that possess a unique combination of outstanding strength, ductility, and corrosion properties. In this paper we report on the advantages of producing these materials via inert gas atomization

Characterization of Atomized High Nitrogen Stainless Steel as a Possible Implant Material

May 1, 1999
Author(s)
Frank S. Biancaniello, Rodney D. Jiggetts, Richard E. Ricker, Stephen D. Ridder
High Nitrogen Stainless Steel (HNSS) can simultaneously have high strength (ultimate and yield), high hardness, high ductility, and outstanding corrosion properties. These properties can be further improved if these HNSS materials are produced from Hot

Characterization of Nanostructured Tungsten Heavy Alloy Produced by Double Ball Milling

May 1, 1999
Author(s)
Frank S. Biancaniello, Stephen D. Ridder, Maureen E. Williams, Rodney D. Jiggetts, L S. Magness
Tungsten powder was ball milled in a controlled atmosphere environment with rapidly solidified powders to produce a nanostructured material. The milled powders were then Hot Isostatic Press (HIP) consolidated. The metallic binder phase milled with the

Temperature Imaging Measurements With a Two Wavelength Imaging Pyrometer

April 1, 1999
Author(s)
J E. Craig, D Lee, R A. Parker, Frank S. Biancaniello, Stephen D. Ridder
An innovative two-wavelength, imaging pyrometer with analysis software provides a method to monitor process uniformity, improve quality and reduce cost in advanced materials processing techniques. The design has achieved high imaging quality and the system

Numerical Simulation of Atomization Gas Flows

December 1, 1998
Author(s)
Pedro I. Espina, Stephen D. Ridder, U Piomelli, Frank S. Biancaniello
The gas-only flow in a close-coupled, gas-metal atomizer is Studied to determine the influence of operational parameters on The structure of the flow field. A parametric study is conducted to determine the effects of jet exit pressure ratio, jet