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Multi-Oxide Direct Ink Writing and Co-Sintering for Binary Ceramic Nuclear Fuel Applications
Multi-Oxide Direct Ink Writing and Co-Sintering for Binary Ceramic Nuclear Fuel Applications
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260311091532.5
- ISBN
- 9798270231439
- DDC
- 670
- 서명/저자
- Multi-Oxide Direct Ink Writing and Co-Sintering for Binary Ceramic Nuclear Fuel Applications / Patrick Lolachi Snarr
- 발행사항
- [Sl] : The University of Texas at Austin, 2025
- 형태사항
- 1 electronic resource (126 pages)
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-06, Section: B.
- 주기사항
- Advisors: Beaman, Joseph; Haas, Derek Committee members: Kovar, Desiderio; Roach, Allen.
- 학위논문주기
- - Ph.D. : The University of Texas at Austin, 2025.
- 초록/해제
- 요약Additive manufacturing (AM) refers to a family of manufacturing techniques which build three-dimensional parts up by stacking many two-dimensional layers on top of one another. One of the benefits of a layered process is it allows for multiple materials to be placed in different spatial regions in the part as it is built. Direct ink writing (DIW) is an extrusion-based AM process that excels at multi-material printing as it can be outfitted with multiple extrusion nozzles. DIW is also a popular slurry based ceramic AM technology as it can produce highly dense ( 90%) components. However, co-sintering multi-material ceramic parts is a large challenge as different sintering behavior between the two materials leads to internal stress build up resulting in part cracking. This dissertation begins to quantify the allowable mismatch to avoid part cracking in solid solution forming multi-material systems and discusses best strategies to reduce the mismatch during co-sintering.Aqueous based Gd2O3 and ZrO2 (8-YSZ) inks, where ZrO2 serves as a surrogate for UO2, were developed for multi-material DIW and co-sintering. A thermal matching procedure was used to screen ink recipes and sintering cycles that best match sintering behavior of the two materials. This process was shown to reduce sintering mismatch from over 10% down to 5%. After matching, multi-material parts were fabricated to quantify allowable sintering mismatch for crack-free parts. Discrete and continuous multi-material interfaces were explored to reduce sintering mismatch, however, due to the formation of a solid solution phase, mixing of the materials may be more harmful than beneficial. It was found ~1% of mismatch is tolerable during debind cycles, and ~5% mismatch is manageable during sintering cycles if slurries are thermally matched. Use of continuous gradients is shown to reduce sintering mismatch, although geometric resolution may be lost due to differential shrinkage amounts. Ultimately, the results are used to inform researchers on how a Gd2O3 - UO2 multi-material DIW system may behave, and future work on this front is discussed.
- 언어주기
- English
- 일반주제명
- Engineering
- 일반주제명
- Materials science
- 일반주제명
- Mechanical engineering
- 키워드
- AM technology
- 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
008260311s2025 us eng d■001000017361194
■00520260311091532.5
■006m o d
■007cr|nu||||||||
■020 ▼a9798270231439
■040 ▼aMiAaPQD▼beng▼cMiAaPQD▼erda
■082 ▼a670
■1001 ▼aSnarr, Patrick Lolachi▼eauthor.
■24510▼aMulti-Oxide Direct Ink Writing and Co-Sintering for Binary Ceramic Nuclear Fuel Applications ▼cPatrick Lolachi Snarr
■260 ▼a[Sl]▼bThe University of Texas at Austin▼c2025
■264 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a1 electronic resource (126 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: Beaman, Joseph; Haas, Derek Committee members: Kovar, Desiderio; Roach, Allen.
■5021 ▼bPh.D.▼cThe University of Texas at Austin▼d2025.
■520 ▼aAdditive manufacturing (AM) refers to a family of manufacturing techniques which build three-dimensional parts up by stacking many two-dimensional layers on top of one another. One of the benefits of a layered process is it allows for multiple materials to be placed in different spatial regions in the part as it is built. Direct ink writing (DIW) is an extrusion-based AM process that excels at multi-material printing as it can be outfitted with multiple extrusion nozzles. DIW is also a popular slurry based ceramic AM technology as it can produce highly dense ( 90%) components. However, co-sintering multi-material ceramic parts is a large challenge as different sintering behavior between the two materials leads to internal stress build up resulting in part cracking. This dissertation begins to quantify the allowable mismatch to avoid part cracking in solid solution forming multi-material systems and discusses best strategies to reduce the mismatch during co-sintering.Aqueous based Gd2O3 and ZrO2 (8-YSZ) inks, where ZrO2 serves as a surrogate for UO2, were developed for multi-material DIW and co-sintering. A thermal matching procedure was used to screen ink recipes and sintering cycles that best match sintering behavior of the two materials. This process was shown to reduce sintering mismatch from over 10% down to 5%. After matching, multi-material parts were fabricated to quantify allowable sintering mismatch for crack-free parts. Discrete and continuous multi-material interfaces were explored to reduce sintering mismatch, however, due to the formation of a solid solution phase, mixing of the materials may be more harmful than beneficial. It was found ~1% of mismatch is tolerable during debind cycles, and ~5% mismatch is manageable during sintering cycles if slurries are thermally matched. Use of continuous gradients is shown to reduce sintering mismatch, although geometric resolution may be lost due to differential shrinkage amounts. Ultimately, the results are used to inform researchers on how a Gd2O3 - UO2 multi-material DIW system may behave, and future work on this front is discussed.
■546 ▼aEnglish
■590 ▼aSchool code: 0227
■650 4▼aEngineering
■650 4▼aMaterials science
■650 4▼aMechanical engineering
■653 ▼aAdditive manufacturing
■653 ▼aDirect ink writing
■653 ▼aAM technology
■653 ▼aManufacturing techniques
■7102 ▼aThe University of Texas at Austin▼bMechanical Engineering.▼edegree granting institution.
■7201 ▼aBeaman, Joseph▼edegree supervisor.
■7201 ▼aHaas, Derek▼edegree supervisor.
■7730 ▼tDissertations Abstracts International▼g87-06B.
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17361194▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


