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Title: Deformation Behavior of Sub-micron and Micron Sized Alumina Particles in Compression.

Abstract

The ability to integrate ceramics with other materials has been limited due to high temperature (>800degC) ceramic processing. Recently, researchers demonstrated a novel process , aerosol deposition (AD), to fabricate ceramic films at room temperature (RT). In this process, sub - micro n sized ceramic particles are accelerated by pressurized gas, impacted on the substrate, plastically deformed, and form a dense film under vacuum. This AD process eliminates high temperature processing thereby enabling new coatings and device integration, in which ceramics can be deposited on metals, plastics, and glass. However, k nowledge in fundamental mechanisms for ceramic particle s to deform and form a dense ceramic film is still needed and is essential in advancing this novel RT technology. In this wo rk, a combination of experimentation and atomistic simulation was used to determine the deformation behavior of sub - micron sized ceramic particle s ; this is the first fundamental step needed to explain coating formation in the AD process . High purity, singl e crystal, alpha alumina particles with nominal size s of 0.3 um and 3.0 um were examined. Particle characterization, using transmission electron microscopy (TEM ), showed that the 0.3 u m particles were relatively defectmore » - free single crystals whereas 3.0 u m p articles were highly defective single crystals or particles contained low angle grain boundaries. Sub - micron sized Al 2 O 3 particles exhibited ductile failure in compression. In situ compression experiments showed 0.3um particles deformed plastically, fractured, and became polycrystalline. Moreover, dislocation activit y was observed within the se particles during compression . These sub - micron sized Al 2 O 3 particles exhibited large accum ulated strain (2 - 3 times those of micron - sized particles) before first fracture. I n agreement with the findings from experimentation , a tomistic simulation s of nano - Al 2 O 3 particles showed dislocation slip and significant plastic deformation during compressi on . On the other hand, the micron sized Al 2 O 3 particles exhibited brittle f racture in compression. In situ compression experiments showed 3um Al 2 O 3 particles fractured into pieces without observable plastic deformation in compression. Particle deformation behaviors will be used to inform Al 2 O 3 coating deposition parameters and particle - particle bonding in the consolidated Al 2 O 3 coatings.« less

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1159119
Report Number(s):
SAND2014-18127
537749
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English

Citation Formats

Sarobol, Pylin, Chandross, Michael E., Carroll, Jay, Mook, William, Boyce, Brad, Kotula, Paul Gabriel, McKenzie, Bonnie Beth, Bufford, Daniel Charles, and Hall, Aaron Christopher. Deformation Behavior of Sub-micron and Micron Sized Alumina Particles in Compression.. United States: N. p., 2014. Web. doi:10.2172/1159119.
Sarobol, Pylin, Chandross, Michael E., Carroll, Jay, Mook, William, Boyce, Brad, Kotula, Paul Gabriel, McKenzie, Bonnie Beth, Bufford, Daniel Charles, & Hall, Aaron Christopher. Deformation Behavior of Sub-micron and Micron Sized Alumina Particles in Compression.. United States. doi:10.2172/1159119.
Sarobol, Pylin, Chandross, Michael E., Carroll, Jay, Mook, William, Boyce, Brad, Kotula, Paul Gabriel, McKenzie, Bonnie Beth, Bufford, Daniel Charles, and Hall, Aaron Christopher. Mon . "Deformation Behavior of Sub-micron and Micron Sized Alumina Particles in Compression.". United States. doi:10.2172/1159119. https://www.osti.gov/servlets/purl/1159119.
@article{osti_1159119,
title = {Deformation Behavior of Sub-micron and Micron Sized Alumina Particles in Compression.},
author = {Sarobol, Pylin and Chandross, Michael E. and Carroll, Jay and Mook, William and Boyce, Brad and Kotula, Paul Gabriel and McKenzie, Bonnie Beth and Bufford, Daniel Charles and Hall, Aaron Christopher.},
abstractNote = {The ability to integrate ceramics with other materials has been limited due to high temperature (>800degC) ceramic processing. Recently, researchers demonstrated a novel process , aerosol deposition (AD), to fabricate ceramic films at room temperature (RT). In this process, sub - micro n sized ceramic particles are accelerated by pressurized gas, impacted on the substrate, plastically deformed, and form a dense film under vacuum. This AD process eliminates high temperature processing thereby enabling new coatings and device integration, in which ceramics can be deposited on metals, plastics, and glass. However, k nowledge in fundamental mechanisms for ceramic particle s to deform and form a dense ceramic film is still needed and is essential in advancing this novel RT technology. In this wo rk, a combination of experimentation and atomistic simulation was used to determine the deformation behavior of sub - micron sized ceramic particle s ; this is the first fundamental step needed to explain coating formation in the AD process . High purity, singl e crystal, alpha alumina particles with nominal size s of 0.3 um and 3.0 um were examined. Particle characterization, using transmission electron microscopy (TEM ), showed that the 0.3 u m particles were relatively defect - free single crystals whereas 3.0 u m p articles were highly defective single crystals or particles contained low angle grain boundaries. Sub - micron sized Al 2 O 3 particles exhibited ductile failure in compression. In situ compression experiments showed 0.3um particles deformed plastically, fractured, and became polycrystalline. Moreover, dislocation activit y was observed within the se particles during compression . These sub - micron sized Al 2 O 3 particles exhibited large accum ulated strain (2 - 3 times those of micron - sized particles) before first fracture. I n agreement with the findings from experimentation , a tomistic simulation s of nano - Al 2 O 3 particles showed dislocation slip and significant plastic deformation during compressi on . On the other hand, the micron sized Al 2 O 3 particles exhibited brittle f racture in compression. In situ compression experiments showed 3um Al 2 O 3 particles fractured into pieces without observable plastic deformation in compression. Particle deformation behaviors will be used to inform Al 2 O 3 coating deposition parameters and particle - particle bonding in the consolidated Al 2 O 3 coatings.},
doi = {10.2172/1159119},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2014},
month = {9}
}

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