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Digital Light Microscopy of Macroporous Ceramics Processed by Consolidation Casting with Mixtures of Native Starches

  • Tessie G. Cruz , Luis Rogerio de O. Hein , Rafael Humberto M. de Siqueira and Kelly Cristina C. de Carvalho
Published/Copyright: May 5, 2013
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Practical Metallography
From the journal Practical Metallography Volume 45 Issue 12

Abstract

Porosity in starch consolidation casting technique is rightly related to original size and morphology of starch granules, leaving a pore structure after burning out. This work reports the results for the addition of different native potato and corn starch proportions in suspensions with TiO2 (rutile) powder. Gelling temperature have been defined after observation under light microscopy using a heating stage. Analysis of porous network and isolated pores have been done from images of samples surfaces obtained by depth from focus reconstruction, revealing a qualitative correlation of pores characteristics and starches additions in suspensions, suggesting that the presence of isolated or interconnected pores can be handled by starches selection to control the amylopectin and amylose contents in slurries. Also, the analysis of porous fraction distribution shows no consistent pattern through specimens’ volume according to starches in mixtures.

Kurzfassung

Die Porosität des Konsolidierungsgussverfahrens unter Stärkezusatz ist direkt von Ausgangsgröße und Aufbau der nach dem Ausbrennen eine poröse Struktur hinterlassenden Stärkekörner abhängig. Dieser Beitrag stellt die Ergebnisse nach Beigabe unterschiedlicher Kartoffel- und Getreidestärkeanteile in Aufschlämmungen mit TiO2—Pulver (Rutil) vor. Die Geliertemperaturen wurden nach Beobachtung unter Lichtmikroskop mit Hilfe einer Heizstufe ermittelt. Die porösen Netze und isolierten Poren wurden nach den Probenoberflächenbildern über die Tiefe der Fokusrekonstruktion analysiert, die womöglich auf eine qualitative Korrelation der Porenmerkmale und Stärkezusätze in Aufschlämmungen schließen. Es ist nahe liegend, dass das Auftreten isolierter bzw. verbundener Poren durch die Stärkeauswahl zur Steuerung des Amylopektin- und Amylosegehaltes in Schlicker genutzt werden kann. Weiterhin ergab die Analyse der porösen Flächenverteilung kein übereinstimmendes Muster über das Probenvolumen entsprechend der Stärken in den Mischungen.

∗ Corresponding author/Korrespondierender Autor: , Phone: (0055) 12 31232873, Fax: (0055) 12 31232852

Dr. Rogerio Hein Associate Professor at São Paulo State University, Guaratinguetá Campus, received his B.S. in Mechanical Engineering, M.Eng. and Dr. Eng. from the State University of Campinas, specialized in materials characterization through microscopy and image processing, including quantitative fractography

Dr. Tessie G. Cruz is a physicist, with Master and Doctor Degrees in Mechanical Engineering from São Paulo State University (UNESP). Her skills include ceramic processing and characterization. She now joined the Aircraft Materials Fatigue Group at Materials and Technology Department of UNESP at Guaratinguetá Campus

Literatur/References

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Received: 2007-12-5
Accepted: 2008-4-21
Published Online: 2013-05-05
Published in Print: 2008-12-01

© 2008, Carl Hanser Verlag, München

Articles in the same Issue

  1. Contents/Inhalt
  2. Inhalt / Contents
  3. Technical Contributions/Fachbeiträge
  4. Digital Light Microscopy of Macroporous Ceramics Processed by Consolidation Casting with Mixtures of Native Starches
  5. Properties of Alumina Coating Formed by Microarc Oxidation Technique on 6061 Aluminum Alloy
  6. The Microstructural Characterization of Dual Phase Steel with the Method of Chemical Etching
https://doi.org/10.3139/147.100405

Articles in the same Issue

  1. Contents/Inhalt
  2. Inhalt / Contents
  3. Technical Contributions/Fachbeiträge
  4. Digital Light Microscopy of Macroporous Ceramics Processed by Consolidation Casting with Mixtures of Native Starches
  5. Properties of Alumina Coating Formed by Microarc Oxidation Technique on 6061 Aluminum Alloy
  6. The Microstructural Characterization of Dual Phase Steel with the Method of Chemical Etching
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