{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/32008"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/32008","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Tribological studies of micro/nanoscale thin solid films","abstract":"Use of thin films has received significant attention in recent years because of their advantages in controlling friction and wear of the bulk material. There have been significant advances in modern applications such as in magnetic disks for data storage and microelectromechanical systems (MEMS) with the introduction of thin solid films coated on substrates. However, due to harsh operating conditions and higher performance requirements, it is necessary to explore new materials and develop experimental and theoretical framework to better understand the coating system. In this work, five different topics in regard to thin solid films have been studied. First, the adhesion behavior of thin film layers in contact with a solid under shearing motion was investigated. Experimental results of pull-off adhesive forces using various coating materials show that adhesion can be controlled by choosing different coating materials with the aid of appropriate shearing force. Second, the mechanical and tribological properties for a novel material, La5Ca9Cu24O41 (LCCO), were evaluated, revealing that LCCO can be an attractive candidate as a nanothermal layer showing good tribological characteristics as well as thermal properties. Third, the contact behavior of thin films coated on substrate was investigated using a nanoindentation tester and a dynamic stiffness tester. When a hard layer is coated on a soft substrate, both asperity interaction and soft substrate deformation should be considered. Fourth, the wear behavior of a layered sphere at the sliding inception was analyzed based on the finite element approach. The relationships among potential wear, material properties, and normal load were obtained. Fifth, the yielding behavior of hafnium diboride (HfB2) hard coatings was studied showing that plastic deformation at the interface was the dominant failure mechanism of the HfB2 films.","abstract_html":"Use of thin films has received significant attention in recent years because of their advantages in controlling friction and wear of the bulk material. There have been significant advances in modern applications such as in magnetic disks for data storage and microelectromechanical systems (MEMS) with the introduction of thin solid films coated on substrates. However, due to harsh operating conditions and higher performance requirements, it is necessary to explore new materials and develop experimental and theoretical framework to better understand the coating system. In this work, five different topics in regard to thin solid films have been studied. First, the adhesion behavior of thin film layers in contact with a solid under shearing motion was investigated. Experimental results of pull-off adhesive forces using various coating materials show that adhesion can be controlled by choosing different coating materials with the aid of appropriate shearing force. Second, the mechanical and tribological properties for a novel material, La5Ca9Cu24O41 (LCCO), were evaluated, revealing that LCCO can be an attractive candidate as a nanothermal layer showing good tribological characteristics as well as thermal properties. Third, the contact behavior of thin films coated on substrate was investigated using a nanoindentation tester and a dynamic stiffness tester. When a hard layer is coated on a soft substrate, both asperity interaction and soft substrate deformation should be considered. Fourth, the wear behavior of a layered sphere at the sliding inception was analyzed based on the finite element approach. The relationships among potential wear, material properties, and normal load were obtained. Fifth, the yielding behavior of hafnium diboride (HfB2) hard coatings was studied showing that plastic deformation at the interface was the dominant failure mechanism of the HfB2 films.","abstract_has_math":false,"creators":["Lee, Jungkyu"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Polycarpou, Andreas A.","Bergman, Lawrence A.","Abelson, John R.","Chasiotis, Ioannis"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2012,"date_issued":"2012-06-27T21:24:15Z","date_published":"2012-06-27T21:24:15Z","updated_at":"2026-07-22T22:25:30Z","subjects":["tribology","thin film","wear","coating"],"languages":["en"],"rights":["Copyright 2012 Jungkyu Lee"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/32008","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Polycarpou, Andreas A.","Bergman, Lawrence A.","Abelson, John R.","Chasiotis, Ioannis"]},{"key":"dc:creator","label":"Author","values":["Lee, Jungkyu"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2012-06-27T21:24:15Z","2014-06-28T10:00:25Z","2012-05"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Mechanical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["tribology","thin film","wear","coating"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2012 Jungkyu Lee"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/32008"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Use of thin films has received significant attention in recent years because of their advantages in controlling friction and wear of the bulk material. There have been significant advances in modern applications such as in magnetic disks for data storage and microelectromechanical systems (MEMS) with the introduction of thin solid films coated on substrates. However, due to harsh operating conditions and higher performance requirements, it is necessary to explore new materials and develop experimental and theoretical framework to better understand the coating system. In this work, five different topics in regard to thin solid films have been studied. First, the adhesion behavior of thin film layers in contact with a solid under shearing motion was investigated. Experimental results of pull-off adhesive forces using various coating materials show that adhesion can be controlled by choosing different coating materials with the aid of appropriate shearing force. Second, the mechanical and tribological properties for a novel material, La5Ca9Cu24O41 (LCCO), were evaluated, revealing that LCCO can be an attractive candidate as a nanothermal layer showing good tribological characteristics as well as thermal properties. Third, the contact behavior of thin films coated on substrate was investigated using a nanoindentation tester and a dynamic stiffness tester. When a hard layer is coated on a soft substrate, both asperity interaction and soft substrate deformation should be considered. Fourth, the wear behavior of a layered sphere at the sliding inception was analyzed based on the finite element approach. The relationships among potential wear, material properties, and normal load were obtained. Fifth, the yielding behavior of hafnium diboride (HfB2) hard coatings was studied showing that plastic deformation at the interface was the dominant failure mechanism of the HfB2 films.","Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2012-03-01T19:53:40Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Lee_Jungkyu.docx: 44933307 bytes, checksum: fcb9e02b0d31bc2956a45cbe99c01508 (MD5) Lee_Jungkyu.pdf: 6152990 bytes, checksum: 139807711405c448fd0197b56c8ba449 (MD5)","Made available in DSpace on 2012-06-27T21:24:15Z (GMT). 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Second, the mechanical and tribological properties for a novel material, La5Ca9Cu24O41 (LCCO), were evaluated, revealing that LCCO can be an attractive candidate as a nanothermal layer showing good tribological characteristics as well as thermal properties. Third, the contact behavior of thin films coated on substrate was investigated using a nanoindentation tester and a dynamic stiffness tester. When a hard layer is coated on a soft substrate, both asperity interaction and soft substrate deformation should be considered. Fourth, the wear behavior of a layered sphere at the sliding inception was analyzed based on the finite element approach. The relationships among potential wear, material properties, and normal load were obtained. Fifth, the yielding behavior of hafnium diboride (HfB2) hard coatings was studied showing that plastic deformation at the interface was the dominant failure mechanism of the HfB2 films.","Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2012-03-01T19:53:40Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Lee_Jungkyu.docx: 44933307 bytes, checksum: fcb9e02b0d31bc2956a45cbe99c01508 (MD5) Lee_Jungkyu.pdf: 6152990 bytes, checksum: 139807711405c448fd0197b56c8ba449 (MD5)","Made available in DSpace on 2012-06-27T21:24:15Z (GMT). No. of bitstreams: 3 Lee_Jungkyu.pdf: 5439078 bytes, checksum: da953c42e28d3f0af68b97a8efdebfb7 (MD5) Lee_Jungkyu.docx: 44933307 bytes, checksum: fcb9e02b0d31bc2956a45cbe99c01508 (MD5) license.txt: 4059 bytes, checksum: 007e6ca5ad63e32733483d91011d651f (MD5)","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by William Ingram (wingram2@illinois.edu) on 2012-06-27T21:24:50Z Item is restricted until 2014-06-27T21:24:27Z","Item reinstated by Sarah Shreeves (sshreeve@illinois.edu) on 2014-06-28T10:00:25Z Item was in collections: Graduate Theses and Dissertations at Illinois (ID: 204) Dissertations and Theses - Mechanical Science and Engineering (ID: 675) No. of bitstreams: 3 Lee_Jungkyu.pdf: 5439078 bytes, checksum: da953c42e28d3f0af68b97a8efdebfb7 (MD5) Lee_Jungkyu.docx: 44933307 bytes, checksum: fcb9e02b0d31bc2956a45cbe99c01508 (MD5) license.txt: 4059 bytes, checksum: 007e6ca5ad63e32733483d91011d651f (MD5)","Item released from any restrictions by Sarah Shreeves (sshreeve@illinois.edu) on 2014-06-28T10:00:25Z"],"dc:identifier":["http://hdl.handle.net/2142/32008"],"dc:language":["en"],"dc:rights":["Copyright 2012 Jungkyu Lee"],"dc:subject":["tribology","thin film","wear","coating"],"dc:title":["Tribological studies of micro/nanoscale thin solid films"],"dc:type":["text"],"thesis:degree_discipline":["Mechanical Engineering"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:30Z"}