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    Thermal Property Imaging of Aluminum Nitride Composites

    Source: Journal of Heat Transfer:;2015:;volume( 137 ):;issue: 002::page 20902
    Author:
    Ziade, Elbara
    ,
    Yang, Jia
    ,
    Sato, Toshiyuki
    ,
    Czubarow, Paul
    ,
    Schmidt, Aaron
    DOI: 10.1115/1.4029012
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Frequency domain thermoreflectance (FDTR) imaging is used to create quantitative thermal conductivity maps of porous Aluminum Nitride (AlN) particles embedded in epoxy. The AlNepoxy composite is polished and coated with a metal layer. A piezo stage is used to move the sample for imaging with our FDTR system. For each pixel, a periodically modulated continuouswave laser (the red pump beam) is focused to a Gaussian spot, less than 2 um in diameter, to locally heat the sample, while a second beam (the green probe beam) monitors the surface temperature through a proportional change in the metals' reflectivity. The pump beam is modulated simultaneously at six frequencies and the thermal properties of the AlN composite are extracted by minimizing the error between the measured probe phase lag at each frequency and an analytical solution to the heat diffusion equation in a multilayer stack of materials. A schematic of the AlN sample in our measurement system and an optical image of the polished surface of the AlNepoxy composite before coating with metal is shown in a. Two scanning electron microscope images of the porous AlN particles prior to embedding in epoxy are shown in b. One of the six simultaneously collected phase images of the probe laser is shown in c. The dark blue regions in the phase image are pits on the sample surface. We fit the six phase images to our thermal model and obtain thermal conductivity maps. The conductivity maps of four particles are shown in d. A log color bar is used to highlight the contrast of thermal conductivity in a single particle. The thermal conductivity of the AlN particles ranges from 80W/mK in the dense regions to 5W/mK in the porous regions.
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      Thermal Property Imaging of Aluminum Nitride Composites

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    http://yetl.yabesh.ir/yetl1/handle/yetl/158424
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    • Journal of Heat Transfer

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    contributor authorZiade, Elbara
    contributor authorYang, Jia
    contributor authorSato, Toshiyuki
    contributor authorCzubarow, Paul
    contributor authorSchmidt, Aaron
    date accessioned2017-05-09T01:19:32Z
    date available2017-05-09T01:19:32Z
    date issued2015
    identifier issn0022-1481
    identifier otherht_137_02_020902.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/158424
    description abstractFrequency domain thermoreflectance (FDTR) imaging is used to create quantitative thermal conductivity maps of porous Aluminum Nitride (AlN) particles embedded in epoxy. The AlNepoxy composite is polished and coated with a metal layer. A piezo stage is used to move the sample for imaging with our FDTR system. For each pixel, a periodically modulated continuouswave laser (the red pump beam) is focused to a Gaussian spot, less than 2 um in diameter, to locally heat the sample, while a second beam (the green probe beam) monitors the surface temperature through a proportional change in the metals' reflectivity. The pump beam is modulated simultaneously at six frequencies and the thermal properties of the AlN composite are extracted by minimizing the error between the measured probe phase lag at each frequency and an analytical solution to the heat diffusion equation in a multilayer stack of materials. A schematic of the AlN sample in our measurement system and an optical image of the polished surface of the AlNepoxy composite before coating with metal is shown in a. Two scanning electron microscope images of the porous AlN particles prior to embedding in epoxy are shown in b. One of the six simultaneously collected phase images of the probe laser is shown in c. The dark blue regions in the phase image are pits on the sample surface. We fit the six phase images to our thermal model and obtain thermal conductivity maps. The conductivity maps of four particles are shown in d. A log color bar is used to highlight the contrast of thermal conductivity in a single particle. The thermal conductivity of the AlN particles ranges from 80W/mK in the dense regions to 5W/mK in the porous regions.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleThermal Property Imaging of Aluminum Nitride Composites
    typeJournal Paper
    journal volume137
    journal issue2
    journal titleJournal of Heat Transfer
    identifier doi10.1115/1.4029012
    journal fristpage20902
    journal lastpage20902
    identifier eissn1528-8943
    treeJournal of Heat Transfer:;2015:;volume( 137 ):;issue: 002
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian