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Effect of controlled capillary force variation on particle alignment and mechanical strength in slip-cast bimodal alumina.

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Title: Effect of controlled capillary force variation on particle alignment and mechanical strength in slip-cast bimodal alumina.
Authors: Valenzuela-Heeger, E.1 (AUTHOR) e.valenzuela@bham.ac.uk, Oshevire, O.1 (AUTHOR), Binner, J.1 (AUTHOR)
Source: Ceramics International. Apr2026:Part B, Vol. 52 Issue 10, p14967-14976. 10p.
Subjects: Slip casting, Molds (Casts & casting), Tensile strength, Ceramic material manufacturing, Grain orientation (Materials), Microstructure, Capillary flow
Abstract: This study investigates how small, controlled variations in mould capillary force influence the microstructure and mechanical reliability of slip-cast bimodal alumina. Capillary pressure was systematically adjusted by varying the plaster-to-water (P/W) ratio of Plaster of Paris (PoP) moulds within a narrow range around the manufacturer's specification. The resulting changes in pore structure and wettability were quantified to calculate effective capillary stresses, which were then correlated with particle alignment and surface-dependent mechanical performance. Bimodal alumina containing large, platy particles was used to statistically track capillary-induced alignment during casting, while three-point bend testing assessed the strength and reliability of sintered bars loaded on the PoP-contact surface. Results show that capillary pressure varies nonlinearly with P/W ratio and that even <15% changes in capillary stress cause measurable differences in particle orientation, grain symmetry, and Weibull modulus. The most uniform microstructure and highest reliability occurred under intermediate capillary conditions that balanced infiltration and shear. These findings reveal that slip casting is highly sensitive to minor fluctuations in processing-induced capillary force. Quantifying this sensitivity provides new insight into the dynamic mould–slurry interface and establishes a framework for improving the reproducibility and defect control of colloidal ceramic forming. [ABSTRACT FROM AUTHOR]
Copyright of Ceramics International 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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Header DbId: egs
DbLabel: Engineering Source
An: 192906691
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Effect of controlled capillary force variation on particle alignment and mechanical strength in slip-cast bimodal alumina.
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  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22Ceramics+International%22&quot;&gt;Ceramics International&lt;/searchLink&gt;. Apr2026:Part B, Vol. 52 Issue 10, p14967-14976. 10p.
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  Data: This study investigates how small, controlled variations in mould capillary force influence the microstructure and mechanical reliability of slip-cast bimodal alumina. Capillary pressure was systematically adjusted by varying the plaster-to-water (P/W) ratio of Plaster of Paris (PoP) moulds within a narrow range around the manufacturer&#39;s specification. The resulting changes in pore structure and wettability were quantified to calculate effective capillary stresses, which were then correlated with particle alignment and surface-dependent mechanical performance. Bimodal alumina containing large, platy particles was used to statistically track capillary-induced alignment during casting, while three-point bend testing assessed the strength and reliability of sintered bars loaded on the PoP-contact surface. Results show that capillary pressure varies nonlinearly with P/W ratio and that even &lt;15% changes in capillary stress cause measurable differences in particle orientation, grain symmetry, and Weibull modulus. The most uniform microstructure and highest reliability occurred under intermediate capillary conditions that balanced infiltration and shear. These findings reveal that slip casting is highly sensitive to minor fluctuations in processing-induced capillary force. Quantifying this sensitivity provides new insight into the dynamic mould–slurry interface and establishes a framework for improving the reproducibility and defect control of colloidal ceramic forming. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: &lt;i&gt;Copyright of Ceramics International is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder&#39;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.&lt;/i&gt; (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.ceramint.2026.02.130
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 10
        StartPage: 14967
    Subjects:
      – SubjectFull: Slip casting
        Type: general
      – SubjectFull: Molds (Casts & casting)
        Type: general
      – SubjectFull: Tensile strength
        Type: general
      – SubjectFull: Ceramic material manufacturing
        Type: general
      – SubjectFull: Grain orientation (Materials)
        Type: general
      – SubjectFull: Microstructure
        Type: general
      – SubjectFull: Capillary flow
        Type: general
    Titles:
      – TitleFull: Effect of controlled capillary force variation on particle alignment and mechanical strength in slip-cast bimodal alumina.
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            NameFull: Valenzuela-Heeger, E.
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            NameFull: Oshevire, O.
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            NameFull: Binner, J.
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              M: 04
              Text: Apr2026:Part B
              Type: published
              Y: 2026
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