rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Zirconium Nitride Coating Fabrication via Fluidized Bed Chemical Vapor Deposition
  name:
    name part: Sudderth, Laura Kathryn
    role:
      role term: creator
    role:
      role term: author.
  name:
    name part: McDeavitt, Sean M.
    role:
      role term: thesis advisor.
  name:
    name part: Perez-Nunez, Delia
    role:
      role term: thesis advisor.
  name:
    name part: Texas A & M University
    role:
      role term: degree granting institution.
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: txu
    date issued: 2015
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: remote
    extent: 1 online resource.
  abstract: In order to reduce the transport and use of high enriched uranium for civilian applications, research reactor fuels are being converted to use low enriched uranium under the Reduced Enrichment for Research and Test Reactors program. A uranium-molybdenum (U-Mo) dispersion type fuel is under investigation for the higher performance reactors that require a higher uranium density than can be provided with current fuel technology. Interactions between U-Mo and the aluminum matrix necessitate the use of a diffusion barrier on the particle surfaces. A fluidized bed chemical vapor deposition system with an inverted reactor was used to create barrier coatings of zirconium nitride on the surface of U-xMo microspheres. The process utilized the metalorganic precursor tetrakis(dimethylamino)zirconium heated in a Swagelok stainless steel sample cylinder to 51 ± 2 °C. Experiments were performed over three phases: preliminary tests, system modifications, and parametric studies. The time-dependent studies analyzed coating produced after 2-8 days of operation at 100 mL/min precursor carrier flow rate and 500 mL/min fluidization flow rate. Flow rate-dependent studies produced coated samples using a total flow rate of 600 mL/min, with the precursor carrier flow rate ranging from 100-300 mL/min and the fluidization flow rate adjusted accordingly. Ultra high purity argon (99.999%) was used for the precursor carrier and fluidization gas. The CVD reaction was carried out at 280 ± 10 °C with precursor transport tubes heated to 60-75 °C. Coatings were qualitatively characterized using energy dispersive X-ray spectroscopy, wavelength dispersive X-ray spectroscopy, and X-ray distribution mapping. Zirconium-based coatings up to 2.2 ± 0.3 μm thick after 2 days of deposition. The estimated coating thickness was not significantly impacted by extending the duration of the deposition process or increasing the precursor carrier gas flow rate. Despite apparent precursor transport throughout the durati…
  note: by Laura Sudderth.
  note: "Major Subject: Nuclear Engineering"
  note: Includes vita.
  note: Master of Science Texas A & M University 2015 http://hdl.handle.net/1969.1/155304
  note: Includes bibliographical references.
  note: Text (Thesis)
  subject:
    topic: Major nuclear engineering
  subject:
    topic: chemical vapor deposition
  subject:
    topic: ZrN
  subject:
    topic: metalorganic
  subject:
    topic: fluidized bed
  subject:
    topic: TDMAZ
  subject:
    topic: U-Mo
  subject:
    topic: RERTR
  subject:
    topic: GTRI
  identifier: http://hdl.handle.net/1969.1/155304
  record info:
    record content source: TXA
    record creation date: 160301
    record change date: 20170928112046.0
    record identifier: in00003614141
    language of cataloging:
      language term: eng