Title page for etd-0031116-220742


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URN etd-0031116-220742
Author Cheng-Han Hsieh
Author's Email Address b2619000@yahoo.com.tw
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Department Materials and Optoelectronic Science
Year 2015
Semester 1
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Hydrothermal growth of hydroxyapatite film on the surface of magnesium alloy (AZ31) based metal matrix compsite containing hydroxyapatite powder produced by friction stir processing
Date of Defense 2016-01-27
Page Count 124
Keyword
  • hydrothermal method
  • bonding layer
  • crack
  • coating technology
  • friction stir process
  • hydroxyapatite
  • calcium deficient hydroxyapatite
  • Abstract The friction stir process was employed to make a composite magnesium alloy AZ31B containing hydroxyapatite. Followed by hydrothermal method, hydroxyapatite (HA) film was deposited onto the sample surface. Hydrothermal reagents are composed of 0.25mol / M of Ca-EDTA and KH2PO4, and sodium hydroxide as a buffer to maintain the pH of the solution at 8.9 and the temperature controlled at 90 ° C. Magnesium in the surface would have replacement reaction with the solution in the system with the time of 3,6,12 hours. A Scanning Electron Microscope (SEM) was used to examine the specimen surface morphology and composition variations X-ray Energy Dispersive Spectrometer (EDS) and back-scattered electron imaging (BEI).
    Experimental results showed a bonding layer with thickness about 100 nm exists between the substrate and the coating. The bonding layer would become joining surface for substrate and Hap. The earlier forming of coating is probably calcium deficient hydroxyapatite (CDHA) , and the top of coating is probably hydroxyapatite (HA). The chemical solution also brings demineralization to form some vertical cracks.
    Keywords: hydroxyapatite , calcium deficient hydroxyapatite, friction stir process, coating technology , cracks, hydrothermal method , bonding layer.
    Advisory Committee
  • Liu-wen Chang - chair
  • Pei-ling Sun - co-chair
  • Po-We Kao - co-chair
  • New-Jin Ho - advisor
  • Files
  • etd-0031116-220742.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2016-02-01

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