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Suspension preparation of alumina whiskers for spray granulation.

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Title: Suspension preparation of alumina whiskers for spray granulation.
Authors: Mirzajany, Roghayeh1, Alizadeh, Masoud1 m-alizadeh@merc.ac.ir, Saremi, Mohsen2, Rahimipour, Mohammad-Reza1
Source: Materials Letters. Oct2018, Vol. 228, p344-347. 4p.
Subjects: Suspensions (Chemistry), Aluminum oxide, Metallic whiskers, Spraying, Granulation, Thermal conductivity, Ceramic materials
Abstract: Whisker presence in a ceramic matrix could increase mechanical strength and reduce thermal conductivity due to phonon scattering. Therefore it is a potential reinforcement in TBCs, However, due to difficult handling and lack of homogenous distribution, their usage is limited. In this study, semi-flowing granules of alumina whiskers were prepared by spray dryer suitable for plasma spraying method. Suspensions of alumina whiskers and nanoparticles were prepared; rheological properties of the slurries were studied using spin rheometer, zeta-sizer and observing the sedimentation height. Two different slurries were prepared; the first one comprises alumina whiskers and the second one comprise 70% wt alumina whiskers- 30% wt alumina nanoparticles as filler. Both slurries were prepared with the same condition of pH, solid content and binder then granulated using a spray dryer. Morphology of the obtained granules was analyzed by FE-SEM and OM, also flow properties were investigated. The results showed that the granules from both slurries were hollow with semi-spherical morphology. However, the powder contained alumina nanoparticles had a thicker shell and smoother surface, because nanoparticles have been filled the gaps between whiskers; therefore it has the better flowability. [ABSTRACT FROM AUTHOR]
Copyright of Materials Letters is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 130744283
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Suspension preparation of alumina whiskers for spray granulation.
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  Data: <searchLink fieldCode="AR" term="%22Mirzajany%2C+Roghayeh%22">Mirzajany, Roghayeh</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Alizadeh%2C+Masoud%22">Alizadeh, Masoud</searchLink><relatesTo>1</relatesTo><i> m-alizadeh@merc.ac.ir</i><br /><searchLink fieldCode="AR" term="%22Saremi%2C+Mohsen%22">Saremi, Mohsen</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Rahimipour%2C+Mohammad-Reza%22">Rahimipour, Mohammad-Reza</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Materials+Letters%22">Materials Letters</searchLink>. Oct2018, Vol. 228, p344-347. 4p.
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  Data: <searchLink fieldCode="DE" term="%22Suspensions+%28Chemistry%29%22">Suspensions (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Aluminum+oxide%22">Aluminum oxide</searchLink><br /><searchLink fieldCode="DE" term="%22Metallic+whiskers%22">Metallic whiskers</searchLink><br /><searchLink fieldCode="DE" term="%22Spraying%22">Spraying</searchLink><br /><searchLink fieldCode="DE" term="%22Granulation%22">Granulation</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+conductivity%22">Thermal conductivity</searchLink><br /><searchLink fieldCode="DE" term="%22Ceramic+materials%22">Ceramic materials</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Whisker presence in a ceramic matrix could increase mechanical strength and reduce thermal conductivity due to phonon scattering. Therefore it is a potential reinforcement in TBCs, However, due to difficult handling and lack of homogenous distribution, their usage is limited. In this study, semi-flowing granules of alumina whiskers were prepared by spray dryer suitable for plasma spraying method. Suspensions of alumina whiskers and nanoparticles were prepared; rheological properties of the slurries were studied using spin rheometer, zeta-sizer and observing the sedimentation height. Two different slurries were prepared; the first one comprises alumina whiskers and the second one comprise 70% wt alumina whiskers- 30% wt alumina nanoparticles as filler. Both slurries were prepared with the same condition of pH, solid content and binder then granulated using a spray dryer. Morphology of the obtained granules was analyzed by FE-SEM and OM, also flow properties were investigated. The results showed that the granules from both slurries were hollow with semi-spherical morphology. However, the powder contained alumina nanoparticles had a thicker shell and smoother surface, because nanoparticles have been filled the gaps between whiskers; therefore it has the better flowability. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Materials Letters is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.matlet.2018.05.136
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 4
        StartPage: 344
    Subjects:
      – SubjectFull: Suspensions (Chemistry)
        Type: general
      – SubjectFull: Aluminum oxide
        Type: general
      – SubjectFull: Metallic whiskers
        Type: general
      – SubjectFull: Spraying
        Type: general
      – SubjectFull: Granulation
        Type: general
      – SubjectFull: Thermal conductivity
        Type: general
      – SubjectFull: Ceramic materials
        Type: general
    Titles:
      – TitleFull: Suspension preparation of alumina whiskers for spray granulation.
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            NameFull: Mirzajany, Roghayeh
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            NameFull: Alizadeh, Masoud
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            NameFull: Saremi, Mohsen
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            NameFull: Rahimipour, Mohammad-Reza
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            – D: 01
              M: 10
              Text: Oct2018
              Type: published
              Y: 2018
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              Value: 228
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