SINTERING OF ADDITIVELY MANUFACTURED HYDROXYAPATITE EMBEDDED WITH BORON NITRIDE NANOTUBES

Simple item page
dc.contributor.advisorAnsell, Troy
dc.contributor.authorMatalavage, Nathan J.
dc.contributor.departmentMechanical and Aerospace Engineering (MAE)
dc.contributor.secondreaderPark, Chanman
dc.date.accessioned2023-08-17T23:09:02Z
dc.date.available2023-08-17T23:09:02Z
dc.date.issued2023-06
dc.description.abstractAs technologies like hypersonics develop, the need for advanced ceramic and composite materials becomes more urgent. These materials must have unique geometries and exceptional materials properties like high melting (or decomposition) temperature, low thermal conductivity, and high thermal shock resistance. In many cases, the only way to achieve the required geometry is by additive manufacturing. Furthermore, ceramic parts often need to be reinforced with nanoparticles to achieve the desired properties. This presents an issue since the high temperature of ceramic post-processing can degrade or even destroy these nanoparticles. This thesis sought to identify a method to sinter a 3D-printed ceramic while keeping the embedded nanoparticles intact. This work focused on hydroxyapatite [Ca10(PO4)6(OH)2] embedded with boron nitride nanotubes (BNNTs). The samples were heat treated in argon using a tube furnace. The temperature and the sintering medium were varied to determine the ideal process. After post-processing, the samples were evaluated using X-ray diffraction, scanning electron microscope analysis, and the Archimedes method. No significant trends in the density were noted throughout testing; however, it was found that samples that were sintered in a boron nitride powder medium displayed intact BNNTs post-sintering. This demonstrated that BNNTs can survive temperatures far above their oxidation point if the environment is carefully controlled.en_US
dc.description.distributionstatementApproved for public release. Distribution is unlimited.en_US
dc.description.serviceEnsign, United States Navyen_US
dc.identifier.curriculumcode570, Naval/Mechanical Engineering
dc.identifier.thesisid39017
dc.identifier.urihttps://hdl.handle.net/10945/72221
dc.publisherMonterey, CA; Naval Postgraduate Schoolen_US
dc.rightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.en_US
dc.subject.authorBNNTen_US
dc.subject.authorboron nitride nanotubesen_US
dc.subject.authoraluminaen_US
dc.subject.authorhydroxyapatiteen_US
dc.subject.authoradditive manufactured ceramicsen_US
dc.subject.authorceramic sinteringen_US
dc.titleSINTERING OF ADDITIVELY MANUFACTURED HYDROXYAPATITE EMBEDDED WITH BORON NITRIDE NANOTUBESen_US
dc.typeThesisen_US
dspace.entity.typePublication
etd.thesisdegree.disciplineMechanical Engineeringen_US
etd.thesisdegree.grantorNaval Postgraduate Schoolen_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.nameMaster of Science in Mechanical Engineeringen_US
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
23Jun_Matalavage_Nathan.pdf
Size:
17.65 MB
Format:
Adobe Portable Document Format
Download
Collections
Theses