ENHANCING MECHANICAL PROPERTIES OF COLD-SPRAYED ALUMINUM COATINGS USING GRAPHENE-NANOPLATELET AND MICRO-BORON-CARBIDE REINFORCEMENTS
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Authors
Rice, Samuel P.
Subjects
additive manufacturing
cold spray
nanoparticles
boron carbide
graphene nanoplatelets
adhesion
high energy ball milling
aerospace
composites
cold spray
nanoparticles
boron carbide
graphene nanoplatelets
adhesion
high energy ball milling
aerospace
composites
Advisors
Nieto, Andy
Ansell, Troy
Date of Issue
2022-06
Date
Publisher
Monterey, CA; Naval Postgraduate School
Language
Abstract
This study explores the individual and combined reinforcement effects of graphene nanoplatelets (GNP) and micro-boron carbide (µB4C) in cold-sprayed Al matrix composite coatings. High energy ball milling was used to create compositions of 2 vol.% GNP, 2 vol.% µB4C, and one of 1 vol.% GNP with 1 vol.% µB4C. All reinforced compositions consisted of a total of 2 vol.% reinforcement to compare the effectiveness of single and dual reinforcement and not the amount of total reinforcement. Coatings were heat treated for 1 h at 400◦C to improve coating densification. Each coating was evaluated using microhardness tests, nanoindentation, dry-sliding wear tests, and adhesion tests. The coatings were also qualitatively evaluated using optical and scanning electron microscopy. All three reinforced coatings experienced a greater than 47% increase in microhardness after heat treatment than the control Al coating. Adhesion testing revealed that 2 vol.% µB4C and the dual-particle coatings had a 40% and 29% increase in adhesion strength, respectively. Most notably, nanoindentation showed that the dual-particle coating experienced a 17% increase in hardness and a 13% increase in elastic modulus compared to the unreinforced coating. The singly reinforced coatings either had the same or lower hardness and elastic modulus than the unreinforced coating.
Type
Thesis
Description
Student Thesis (NPS NRP Project Related)
Organization
Identifiers
NPS Report Number
Sponsors
ONR, Washington DC, 22217
Funding
This research is supported by funding from the Naval Postgraduate School, Naval Research Program (PE 0605853N/2098). https://nps.edu/nrp
Chief of Naval Operations (CNO)
Chief of Naval Operations (CNO)
Format
Citation
Distribution Statement
Approved for public release. Distribution is unlimited.
Rights
This 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.