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The Resource Generation of graphite particles by abrasion and their characterization, by Raymond Steven Troy

Generation of graphite particles by abrasion and their characterization, by Raymond Steven Troy

Creator
Author
Contributor
Summary
Characterization of graphite particles (dust) produced by abrasion that would occur in an operating pebble bed reactor is of interest for reasons of safety, operation, and maintenance. To better understand this abrasion and particle generation, I have completed two independent tests using a custom in-house, designed and built, testing system. One test of sliding abrasion and one test of spinning abrasion was conducted, both in a 1% - 5% relative humidity air environment. I have used both a commercial non-nuclear grade graphite denoted, GM-101, and a nuclear grade, MLRF1, from SGL Carbon for these tests. For spinning abrasion, GM-101 and MLRF1 were used. For sliding abrasion, only GM-101 was used. I have obtained size distributions for the abraded particles, fit lognormal functions to those size distributions (for use in computer codes), determined particle shapes, measured temperature and humidity during the tests, measured surface temperatures at the contact point of the samples, calculated wear rates, measured the surface roughness of both pre-test and post-test samples, measured particle surface areas, measured pore volumes, and pore volume distributions of particles produced during abrasion of graphite surfaces under different loadings and sliding speeds, or rotational speeds, for both experiments. The experiments showed that as loading (analogous to pebble depth in the reactor) and rotation speeds or sliding speed increase, so do wear rates, concentration of particles and particle surface area. The upper limit on the size of the abraded particles that was observed was less than about 4000 nm in both tests. The shape of the dust particles was in every case nonspherical. In all, our research shows that pebble abrasion is a complex process that is not constant during operation and thus should be considered for future work
Language
eng
Work
Publication
Extent
1 online resource (viii, 107 pages)
Note
  • Abstract from short.pdf file
  • "A Dissertation Presented to The Faculty of the Graduate School At the University of Missouri In Partial Fulfillment Of the Requirements for the Degree Doctor of Philosophy."
  • Dissertation co-supervisors: Drs. Robert V. Tompson, Tushar K. Ghosh, Sudarshan K. Loyalka
  • Includes vita
Instance
Label
Generation of graphite particles by abrasion and their characterization
Title
Generation of graphite particles by abrasion and their characterization
Statement of responsibility
by Raymond Steven Troy
Creator
Contributor
Author
Thesis advisor
Subject
Genre
Language
eng
Summary
Characterization of graphite particles (dust) produced by abrasion that would occur in an operating pebble bed reactor is of interest for reasons of safety, operation, and maintenance. To better understand this abrasion and particle generation, I have completed two independent tests using a custom in-house, designed and built, testing system. One test of sliding abrasion and one test of spinning abrasion was conducted, both in a 1% - 5% relative humidity air environment. I have used both a commercial non-nuclear grade graphite denoted, GM-101, and a nuclear grade, MLRF1, from SGL Carbon for these tests. For spinning abrasion, GM-101 and MLRF1 were used. For sliding abrasion, only GM-101 was used. I have obtained size distributions for the abraded particles, fit lognormal functions to those size distributions (for use in computer codes), determined particle shapes, measured temperature and humidity during the tests, measured surface temperatures at the contact point of the samples, calculated wear rates, measured the surface roughness of both pre-test and post-test samples, measured particle surface areas, measured pore volumes, and pore volume distributions of particles produced during abrasion of graphite surfaces under different loadings and sliding speeds, or rotational speeds, for both experiments. The experiments showed that as loading (analogous to pebble depth in the reactor) and rotation speeds or sliding speed increase, so do wear rates, concentration of particles and particle surface area. The upper limit on the size of the abraded particles that was observed was less than about 4000 nm in both tests. The shape of the dust particles was in every case nonspherical. In all, our research shows that pebble abrasion is a complex process that is not constant during operation and thus should be considered for future work
Cataloging source
MUU
http://library.link/vocab/creatorDate
1983-
http://library.link/vocab/creatorName
Troy, Raymond Steven
Degree
PhD
Dissertation note
Thesis
Dissertation year
2015.
Government publication
government publication of a state province territory dependency etc
Granting institution
University of Missouri--Columbia
Index
no index present
Literary form
non fiction
Nature of contents
  • dictionaries
  • bibliography
  • theses
http://library.link/vocab/relatedWorkOrContributorDate
1958-
http://library.link/vocab/relatedWorkOrContributorName
  • Tompson, R. V.
  • Loyalka, S. K.
  • Ghosh, Tushar K.
http://library.link/vocab/subjectName
  • Pebble bed reactors
  • Graphite
  • Dust
Label
Generation of graphite particles by abrasion and their characterization, by Raymond Steven Troy
Instantiates
Publication
Note
  • Abstract from short.pdf file
  • "A Dissertation Presented to The Faculty of the Graduate School At the University of Missouri In Partial Fulfillment Of the Requirements for the Degree Doctor of Philosophy."
  • Dissertation co-supervisors: Drs. Robert V. Tompson, Tushar K. Ghosh, Sudarshan K. Loyalka
  • Includes vita
Bibliography note
Includes bibliographical references
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Control code
960967967
Extent
1 online resource (viii, 107 pages)
Form of item
online
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Other physical details
illustrations (some color)
Specific material designation
remote
System control number
(OCoLC)960967967
Label
Generation of graphite particles by abrasion and their characterization, by Raymond Steven Troy
Publication
Note
  • Abstract from short.pdf file
  • "A Dissertation Presented to The Faculty of the Graduate School At the University of Missouri In Partial Fulfillment Of the Requirements for the Degree Doctor of Philosophy."
  • Dissertation co-supervisors: Drs. Robert V. Tompson, Tushar K. Ghosh, Sudarshan K. Loyalka
  • Includes vita
Bibliography note
Includes bibliographical references
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Control code
960967967
Extent
1 online resource (viii, 107 pages)
Form of item
online
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Other physical details
illustrations (some color)
Specific material designation
remote
System control number
(OCoLC)960967967

Subject

Genre

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