자료유형  

 학위논문

Control Number  

0016932907

International Standard Book Number  

9798379870423

Dewey Decimal Classification Number  

620.11223

Main Entry-Personal Name  

Kerrigan, Sean Patrick.

Publication, Distribution, etc. (Imprint  

[S.l.] : North Carolina State University., 2023

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2023

Physical Description  

1 online resource(115 p.)

General Note  

Source: Dissertations Abstracts International, Volume: 85-01, Section: B.

General Note  

Advisor: Jiang, Xiaoning;Bourham, Mohamed.

Dissertation Note  

Thesis (Ph.D.)--North Carolina State University, 2023.

Restrictions on Access Note  

This item must not be sold to any third party vendors.

Summary, Etc.  

요약The Very-High Temperature Reactor (VHTR) is a proposed generation IV reactor design that can reach operating temperatures of 1000 °C. The next generation of nuclear power plants offer a material challenge to current reactor sensing technologies. Development of wireless, nonintrusive aluminum nitride (AlN) based piezoelectric vibration sensors aims to provide the VHTR with reliable and safe sensing in the environment of high-temperatures, irradiation, and corrosion.A piezoelectric AlN-based accelerometer was designed and fabricated using bulk AlN and Inconel 601 as the housing and seismic mass. The sensor was shown to have a working frequency range up to 600 Hz, which is ideal for structural damage detection within a nuclear power plant. A multi-axial accelerometer was fabricated using three AlN single crystals as the piezoelectric sensing elements in order to determine the location of the vibrational source.The effect of radiation, high-temperature, and corrosion on the AlN single crystal sensing elements were explored. AlN single crystal samples and a fully fabricated sensor were irradiated using a Co-60 gamma source for periods of 1 and 2 months. The analysis of the sensor performance post-irradiation showed no significant change in the output signal. The surface topography of the samples post-irradiation was observed using SEM and EDS characterization techniques. No changes in the surface were observed. The effect of neutrons on the AlN single crystals was simulated using a heavy-ion beam. The results showed that Inconel 601 provides strong shielding to the AlN single crystals from incoming particles. The angle of the incoming particles affects the penetration depth of the particles.The sensor and AlN single crystals were exposed to high-temperatures up to 1000 °C using an industrial furnace. The tests showed constant performance up to 1000 °C while a long-exposure test showed visible charring on the sensor housing. The developed accelerometer was able to successfully acquire data at temperatures up to 1000 °C, and the wireless communications system was able to transmit the data reliably and efficiently.The effects of corrosion on the sensor can impact the performance and expected operational lifetime of the sensor. Cyclic polarization corrosion tests were performed to determine the corrosion rate of the AlN single crystals. Corrosion experiments were run at pH values of 3 and 6 and temperatures up to 200 °C. The effect of thin-film coatings of ZrO2 on the sensor's corrosion resistance was investigated. AlN samples were irradiated using a Co-60 gamma source for periods of 1 and 2 months to investigate the effect of corrosion on irradiated samples. The addition of thinfilm coatings of ZrO2showed improved corrosion resistance especially at higher temperatures compared to the bare substrates. The irradiated samples showed similar corrosion behavior, yet the corrosion rate of the irradiated samples was higher than the unirradiated bare samples. The estimated operational lifetimes of the AlN sensing elements showed that AlN piezoelectric accelerometers could be an asset to next generation of nuclear power plants especially if thin-films or other shielding methods are employed to control the radiation and temperature effects of the environment.The characterization of the AlN sensing elements showed the robustness of the material against high-temperatures, irradiation, and corrosion effects. Piezoelectric AlN-based vibration sensors that were fabricated and tested showed the applicability to be outfitted to the next generation of nuclear power plant designs.

Subject Added Entry-Topical Term  

Corrosion tests.

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Wireless communications.

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Polymers.

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Nuclear energy.

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Gold.

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Nuclear reactors.

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Thermocouples.

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Electric fields.

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High temperature.

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Sensors.

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Phase transitions.

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Aluminum.

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Communications networks.

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Design specifications.

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Heat conductivity.

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Radiation.

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Accelerometers.

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Technology.

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Vibration.

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Nuclear power plants.

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Composite materials.

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Design.

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Electrical engineering.

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Electromagnetics.

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Energy.

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High temperature physics.

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Industrial engineering.

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Materials science.

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Nuclear engineering.

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Nuclear physics.

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Physics.

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Polymer chemistry.

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Thermodynamics.

Added Entry-Corporate Name  

North Carolina State University.

Host Item Entry  

Dissertations Abstracts International. 85-01B.

Host Item Entry  

Dissertation Abstract International

Electronic Location and Access  

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Control Number  

joongbu:643638