Repository logo
 

Effects of the addition of boron – nitride nanoplatelets to hydroxyapatite: processing, testing, and characterization

Simple item page
dc.contributor.authorAguirre, Trevor G., author
dc.contributor.authorHolland, Troy B., advisor
dc.contributor.authorRadford, Donald W., committee member
dc.contributor.authorNeilson, James R., committee member
dc.date.accessioned2017-06-09T15:42:52Z
dc.date.available2017-06-09T15:42:52Z
dc.date.issued2017
dc.description.abstractBioceramics range in biocompatibility from inert oxides that do not react with the body to the other extreme of materials that completely absorbed by the human body, but are prone to failure by fracture. Limited fracture toughness (KIC) and flexural strength (σFS) are major factors limiting wider scale application as structural implant materials. KIC and σFS of ceramics can be improved through grain size refinement and through the addition of various reinforcement materials. The bioceramic hydroxyapatite (HA), the primary inorganic component of bone, has excellent osteoconductivity which offers a suitable surface for new bone growth and integration but suffers from low KIC. To improve the KIC of HA we used boron nitride nanoplatelets (BNNPs), a strong and biocompatible material, making them excellent candidate for use in the human body. However, these materials have been shown to cause embrittlement of the material they are incorporated in; thus, it becomes important to understand the effect of BNNPs through analysis of the failure statistics of tested samples. Using spark plasma sintering to create these materials HA – BNNP composites with 0.5, 1.0 and 2.0 wt% BNNPs were fabricated. Sample grain sizes were measured to evaluate the effect the BNNPs had on the microstructure and the flexural strength, fracture toughness, and hardness were tested to observe the effect BNNP had on the mechanical properties of HA and as well as the failure statistics. To analyze the failure statistics of the HA BNNP composites the Weibull Distribution was used because studies have shown that the Normal Distribution does not accurately report the failure statistics of brittle materials. This work summarizes the effect of the addition of BNNPs to spark plasma sintered HA. The results of this study show that BNNPs are capable of increasing flexural strength and fracture toughness through grain size refinement but BNNPs lead to a measurable decrease in the reliability of the material, which is indicative of the predictability of measured material property value and yields information about the flaw distributions in these materials.
dc.format.mediumborn digital
dc.format.mediummasters theses
dc.identifierAguirre_colostate_0053N_14149.pdf
dc.identifier.urihttp://hdl.handle.net/10217/181420
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relation.ispartof2000-2019
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.subjectboron nitride
dc.subjectfracture toughness
dc.subjectWeibull statistics
dc.subjectceramic matrix composites
dc.subjectbioceramics
dc.subjecthydroxyapatite
dc.titleEffects of the addition of boron – nitride nanoplatelets to hydroxyapatite: processing, testing, and characterization
dc.typeText
dcterms.rights.dplaThis Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
thesis.degree.disciplineMechanical Engineering
thesis.degree.grantorColorado State University
thesis.degree.levelMasters
thesis.degree.nameMaster of Science (M.S.)

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Aguirre_colostate_0053N_14149.pdf
Size:
6.26 MB
Format:
Adobe Portable Document Format
Download

Collections

2000-2019
Theses and Dissertations