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Aqueous colloidal processing of near-net shape B4C–Ni cermet compacts.

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Title: Aqueous colloidal processing of near-net shape B4C–Ni cermet compacts.
Authors: Rodríguez-Rojas, Fernando1, Moreno, Rodrigo2, Guiberteau, Fernando1, Ortiz, Angel L.1 alortiz@unex.es
Source: Journal of the European Ceramic Society. Jul2016, Vol. 36 Issue 8, p1915-1921. 7p.
Subjects: Ceramic metals, Suspensions (Chemistry), Microstructure, Slip casting, Colloids
Abstract: Aqueous colloidal processing was optimized for the environmentally friendly preparation of concentrated suspensions (29–40 vol.% solids loadings) suitable for the near-net shaping of B 4 C + 16.6 vol.%Ni cermet compacts by slip casting. Specifically, on the basis of studies with dilute suspensions, it was confirmed that using very basic pHs (i.e., 10) is the key to ensuring the inertness and dispersibility of the Ni particles in water, and that deflocculant contents of at least ∼0.5 wt.% PKV and PAA are required to promote the colloidal stability of the B 4 C and Ni particles, respectively. Concentrated B 4 C + 16.6 vol.%Ni suspensions were consequently prepared at pH 11 with 1 wt.% PKV and PAA, and it was found that sonication for 1 min optimizes the rheological properties. Lastly, these concentrated suspensions were proven to be suitable for the slip casting of robust, highly-dense B 4 C–Ni cermet compacts with near-net shape, whose green microstructures are very uniform, exhibit well-dispersed and packed particles, with no evidence of cracks or macrodefects, and with relative densities greater than 58% of the theoretical. [ABSTRACT FROM AUTHOR]
Copyright of Journal of the European Ceramic Society 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: 113868891
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PubTypeId: academicJournal
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  Data: Aqueous colloidal processing of near-net shape B4C–Ni cermet compacts.
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  Data: <searchLink fieldCode="AR" term="%22Rodríguez-Rojas%2C+Fernando%22">Rodríguez-Rojas, Fernando</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Moreno%2C+Rodrigo%22">Moreno, Rodrigo</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Guiberteau%2C+Fernando%22">Guiberteau, Fernando</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Ortiz%2C+Angel+L%2E%22">Ortiz, Angel L.</searchLink><relatesTo>1</relatesTo><i> alortiz@unex.es</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+the+European+Ceramic+Society%22">Journal of the European Ceramic Society</searchLink>. Jul2016, Vol. 36 Issue 8, p1915-1921. 7p.
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  Data: <searchLink fieldCode="DE" term="%22Ceramic+metals%22">Ceramic metals</searchLink><br /><searchLink fieldCode="DE" term="%22Suspensions+%28Chemistry%29%22">Suspensions (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Microstructure%22">Microstructure</searchLink><br /><searchLink fieldCode="DE" term="%22Slip+casting%22">Slip casting</searchLink><br /><searchLink fieldCode="DE" term="%22Colloids%22">Colloids</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Aqueous colloidal processing was optimized for the environmentally friendly preparation of concentrated suspensions (29–40 vol.% solids loadings) suitable for the near-net shaping of B 4 C + 16.6 vol.%Ni cermet compacts by slip casting. Specifically, on the basis of studies with dilute suspensions, it was confirmed that using very basic pHs (i.e., 10) is the key to ensuring the inertness and dispersibility of the Ni particles in water, and that deflocculant contents of at least ∼0.5 wt.% PKV and PAA are required to promote the colloidal stability of the B 4 C and Ni particles, respectively. Concentrated B 4 C + 16.6 vol.%Ni suspensions were consequently prepared at pH 11 with 1 wt.% PKV and PAA, and it was found that sonication for 1 min optimizes the rheological properties. Lastly, these concentrated suspensions were proven to be suitable for the slip casting of robust, highly-dense B 4 C–Ni cermet compacts with near-net shape, whose green microstructures are very uniform, exhibit well-dispersed and packed particles, with no evidence of cracks or macrodefects, and with relative densities greater than 58% of the theoretical. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of the European Ceramic Society 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:
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      – Type: doi
        Value: 10.1016/j.jeurceramsoc.2016.02.051
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      – Code: eng
        Text: English
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        PageCount: 7
        StartPage: 1915
    Subjects:
      – SubjectFull: Ceramic metals
        Type: general
      – SubjectFull: Suspensions (Chemistry)
        Type: general
      – SubjectFull: Microstructure
        Type: general
      – SubjectFull: Slip casting
        Type: general
      – SubjectFull: Colloids
        Type: general
    Titles:
      – TitleFull: Aqueous colloidal processing of near-net shape B4C–Ni cermet compacts.
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            NameFull: Rodríguez-Rojas, Fernando
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            NameFull: Moreno, Rodrigo
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            NameFull: Guiberteau, Fernando
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            NameFull: Ortiz, Angel L.
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            – D: 01
              M: 07
              Text: Jul2016
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              Y: 2016
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