Calcium passivation and properties of Al/Ca composite conductors

dc.contributor.advisor Iver E. Anderson
dc.contributor.advisor James McCalley
dc.contributor.author Czahor, Charles
dc.contributor.department Materials Science and Engineering
dc.date 2019-11-04T21:46:24.000
dc.date.accessioned 2020-06-30T03:18:23Z
dc.date.available 2020-06-30T03:18:23Z
dc.date.copyright Thu Aug 01 00:00:00 UTC 2019
dc.date.embargo 2001-01-01
dc.date.issued 2019-01-01
dc.description.abstract <p>Light, strong, high-conductivity materials are desirable for overhead power transmission and distribution conductors. An aluminum/calcium composite with nanofilamentary reinforcement was produced by powder metallurgy and deformation processing to fine wires. Upon achieving the desired dimension, the wires were heat treated to convert the calcium to Al2Ca intermetallic reinforcement filaments. Extended heat treatments were used to evaluate the upper operating temperature of the material. The processing steps, microstructure, conductivity, and tensile strength of Al/Ca composites were evaluated. The measured properties indicate that the number of support towers required for a HVDC transmission line can be reduced by more than 23% when using Al/Ca composite conductors. The properties of this material can be tailored to specific applications by modifying parameters during production. The lack of availability of fine calcium powder necessary to produce Al/Ca composites of sufficient strength is a barrier to their development. A method for protecting Ca surfaces from moisture in the environment was studied to enable its safe production. Preliminary experiments identified a fluorine containing compound that could be introduced in a gaseous stream and passivate Ca. This compound was implemented into a gas atomizer to protect Ca during production and limit exposure of bare metal to atmospheric conditions. Atomization parameters were evaluated, and powder was characterized for size distribution, surface chemistry, and flammability indicating that passivation treatments were successful.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/etd/17431/
dc.identifier.articleid 8438
dc.identifier.contextkey 15681399
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath etd/17431
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/31614
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/etd/17431/Czahor_iastate_0097E_18233.pdf|||Fri Jan 14 21:23:05 UTC 2022
dc.subject.disciplines Materials Science and Engineering
dc.subject.disciplines Mechanics of Materials
dc.subject.disciplines Oil, Gas, and Energy
dc.subject.keywords Aluminum
dc.subject.keywords Atomization
dc.subject.keywords Lighweighting
dc.subject.keywords Passivation
dc.subject.keywords Powder Metallurgy
dc.title Calcium passivation and properties of Al/Ca composite conductors
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication bf9f7e3e-25bd-44d3-b49c-ed98372dee5e
thesis.degree.discipline Wind Energy Science, Engineering, and Policy
thesis.degree.level dissertation
thesis.degree.name Doctor of Philosophy
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