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Mechanisms of Film Formation During Micro-Cold Spray of ZnO Ceramics
Mechanisms of Film Formation During Micro-Cold Spray of ZnO Ceramics
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260311091545.5
- ISBN
- 9798270232566
- DDC
- 000
- 서명/저자
- Mechanisms of Film Formation During Micro-Cold Spray of ZnO Ceramics / Scott Randolph Burlison
- 발행사항
- [Sl] : The University of Texas at Austin, 2025
- 형태사항
- 1 electronic resource (114 pages)
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-06, Section: B.
- 주기사항
- Advisors: Kovar, Desiderio Committee members: Taleff, Eric; Becker, Michael F.; Aluru, Narayana.
- 학위논문주기
- - Ph.D. : The University of Texas at Austin, 2025.
- 초록/해제
- 요약Micro-cold spray (MCS) is an additive manufacturing process that utilizes aerosolized sub-micron to micron-scale ceramic and metal particles to deposit patterned thick films at room temperature. Solid particles are entrained in inert gas to produce an aerosol and accelerated towards a substrate through a nozzle. The impulse for acceleration occurs by means of a pressure differential between near atmosphere upstream of the nozzle to low vacuum at the nozzle outlet. Processing parameters for MCS-produced films are dependent on powder material, particle size, particle and substrate orientation, and particle morphology. As such, simulations are valuable to understand the deformation and film formation mechanisms required to achieve deposition. This dissertation focuses on the MCS of zinc oxide (ZnO) powders to produce films. ZnO has a wide range of applications, including use in gas sensors, photodetectors, and solar cells, among others. A primary tool for studying the MCS process is molecular dynamics (MD) simulations. The impact behavior of individual ZnO nanoparticles (NPs) is first studied to determine the influence of particle size and impact velocity on induced deformation and film formation mechanisms. While single-NP impacts provide valuable insights, powders used in MCS are often agglomerated or aggregated and these differences in powder morphology may change the particle deformation mechanisms responsible for film formation compared to single particle impacts. Next, MD simulations of aggregated powders were performed to observe film formation on a size scale closer to that which is observed experimentally. Parameters of interest included pre-deposition heat treatment temperature, which directly affects the strength of the aggregate, the aggregate impact orientation, and the packing geometry of the particles within the aggregate. The parameters were systematically varied to study their effects on particle and aggregate deformation and film formation.
- 언어주기
- English
- 일반주제명
- Molecular physics
- 일반주제명
- Condensed matter physics
- 일반주제명
- Materials science
- 일반주제명
- Nanoscience
- 키워드
- Micro-cold spray
- 키워드
- Zinc oxide
- 키워드
- Nanoparticles
- 기타저자
- The University of Texas at Austin Mechanical Engineering
- 기본자료저록
- Dissertations Abstracts International. 87-06B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260311091545.5
■006m o d
■007cr|nu||||||||
■020 ▼a9798270232566
■040 ▼aMiAaPQD▼beng▼cMiAaPQD▼erda
■082 ▼a000
■1001 ▼aBurlison, Scott Randolph▼eauthor.
■24510▼aMechanisms of Film Formation During Micro-Cold Spray of ZnO Ceramics ▼cScott Randolph Burlison
■260 ▼a[Sl]▼bThe University of Texas at Austin▼c2025
■264 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a1 electronic resource (114 pages)
■336 ▼atext▼btxt▼2rdacontent
■337 ▼acomputer▼bc▼2rdamedia
■338 ▼aonline resource▼bcr▼2rdacarrier
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-06, Section: B.
■500 ▼aAdvisors: Kovar, Desiderio Committee members: Taleff, Eric; Becker, Michael F.; Aluru, Narayana.
■5021 ▼bPh.D.▼cThe University of Texas at Austin▼d2025.
■520 ▼aMicro-cold spray (MCS) is an additive manufacturing process that utilizes aerosolized sub-micron to micron-scale ceramic and metal particles to deposit patterned thick films at room temperature. Solid particles are entrained in inert gas to produce an aerosol and accelerated towards a substrate through a nozzle. The impulse for acceleration occurs by means of a pressure differential between near atmosphere upstream of the nozzle to low vacuum at the nozzle outlet. Processing parameters for MCS-produced films are dependent on powder material, particle size, particle and substrate orientation, and particle morphology. As such, simulations are valuable to understand the deformation and film formation mechanisms required to achieve deposition. This dissertation focuses on the MCS of zinc oxide (ZnO) powders to produce films. ZnO has a wide range of applications, including use in gas sensors, photodetectors, and solar cells, among others. A primary tool for studying the MCS process is molecular dynamics (MD) simulations. The impact behavior of individual ZnO nanoparticles (NPs) is first studied to determine the influence of particle size and impact velocity on induced deformation and film formation mechanisms. While single-NP impacts provide valuable insights, powders used in MCS are often agglomerated or aggregated and these differences in powder morphology may change the particle deformation mechanisms responsible for film formation compared to single particle impacts. Next, MD simulations of aggregated powders were performed to observe film formation on a size scale closer to that which is observed experimentally. Parameters of interest included pre-deposition heat treatment temperature, which directly affects the strength of the aggregate, the aggregate impact orientation, and the packing geometry of the particles within the aggregate. The parameters were systematically varied to study their effects on particle and aggregate deformation and film formation.
■546 ▼aEnglish
■590 ▼aSchool code: 0227
■650 4▼aMolecular physics
■650 4▼aCondensed matter physics
■650 4▼aMaterials science
■650 4▼aNanoscience
■653 ▼aMicro-cold spray
■653 ▼aMolecular dynamics
■653 ▼aZinc oxide
■653 ▼aNanoparticles
■7102 ▼aThe University of Texas at Austin▼bMechanical Engineering.▼edegree granting institution.
■7201 ▼aKovar, Desiderio▼edegree supervisor.
■7730 ▼tDissertations Abstracts International▼g87-06B.
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17361229▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
