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Title: Specific Adaptation of Gas Atomization Processing for Al-Based Alloy Powder for Additive Manufacturing

Abstract

The charge for each gas atomization experiment was provided by Alcoa and consisted of cast blocks cut into 1 inch by 1 inch square rods of the chosen aluminum alloys. The atmosphere in the melting chamber and connected atomization system was evacuated with a mechanical pump prior to backfilling with ultrahigh purity (UHP grade) Ar. The melt was contained in a bottom tapped alumina crucible with an alumina stopper rod to seal the exit while heating to a pouring temperature of 1000 – 1400°C. When the desired superheat was reached, the stopper rod was lifted and melt flowed through pour tube and was atomized with Ar from a 45-22-052-409 gas atomization nozzle (or atomization die), having a jet apex angle of 45 degrees with 22 cylindrical gas jets (each with diameter of 1.32 mm or 0.052 inches) arrayed around the axis of a 10.4 mm central bore. The Ar atomization gas supply regulator pressure was set to produce nozzle manifold pressures for the series of runs at pressures of 250-650 psi. Secondary gas halos of Ar+O 2 and He also were added to the interior of the spray chamber at various downstream locations for additional cooling of the atomized droplets,more » surface passivation, and to prevent coalescence of the resulting powder.« less

Authors:
 [1];  [2]
  1. Ames Lab., Ames, IA (United States)
  2. Alcoa Inc., Pittsburgh, PA (United States)
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1415042
Report Number(s):
AL-CRADA-2014-03
DOE Contract Number:  
AC02-07CH11358
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Anderson, Iver, and Siemon, John. Specific Adaptation of Gas Atomization Processing for Al-Based Alloy Powder for Additive Manufacturing. United States: N. p., 2017. Web. doi:10.2172/1415042.
Anderson, Iver, & Siemon, John. Specific Adaptation of Gas Atomization Processing for Al-Based Alloy Powder for Additive Manufacturing. United States. doi:10.2172/1415042.
Anderson, Iver, and Siemon, John. Fri . "Specific Adaptation of Gas Atomization Processing for Al-Based Alloy Powder for Additive Manufacturing". United States. doi:10.2172/1415042. https://www.osti.gov/servlets/purl/1415042.
@article{osti_1415042,
title = {Specific Adaptation of Gas Atomization Processing for Al-Based Alloy Powder for Additive Manufacturing},
author = {Anderson, Iver and Siemon, John},
abstractNote = {The charge for each gas atomization experiment was provided by Alcoa and consisted of cast blocks cut into 1 inch by 1 inch square rods of the chosen aluminum alloys. The atmosphere in the melting chamber and connected atomization system was evacuated with a mechanical pump prior to backfilling with ultrahigh purity (UHP grade) Ar. The melt was contained in a bottom tapped alumina crucible with an alumina stopper rod to seal the exit while heating to a pouring temperature of 1000 – 1400°C. When the desired superheat was reached, the stopper rod was lifted and melt flowed through pour tube and was atomized with Ar from a 45-22-052-409 gas atomization nozzle (or atomization die), having a jet apex angle of 45 degrees with 22 cylindrical gas jets (each with diameter of 1.32 mm or 0.052 inches) arrayed around the axis of a 10.4 mm central bore. The Ar atomization gas supply regulator pressure was set to produce nozzle manifold pressures for the series of runs at pressures of 250-650 psi. Secondary gas halos of Ar+O2 and He also were added to the interior of the spray chamber at various downstream locations for additional cooling of the atomized droplets, surface passivation, and to prevent coalescence of the resulting powder.},
doi = {10.2172/1415042},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jun 30 00:00:00 EDT 2017},
month = {Fri Jun 30 00:00:00 EDT 2017}
}

Technical Report:

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