ANALYSIS OF Al<sub>2</sub>O<sub>3</sub> CERAMIC CONFORMED BY COMMERCIAL STARCH CONSOLIDATION UNDER LOW PRESSURE

Autores

  • E. Campos
  • F. P. Santos
  • F. C. L. Melo
  • R. Y. Honda
  • R. P. Mota

DOI:

https://doi.org/10.17563/rbav.v23i1.148

Resumo

The production of ceramic by commercial starch consolidation process spread swiftly in the scientific circles due to the possibility of production of complex geometry pieces with good mechanical strength and low impact to the environment. However, air or gas bubbles appear during the preparation of the slip and they can cause the appearance of undesirable pores, reducing the ceramic mechanical strength. In this work it was tried to find out a method in order to reduce the bubble number in the colloidal dispersion. The use of vacuum mechanical pump becomes possible the discharge of air or other gases from this dispersion and consequently decrease the number of pores in the ceramic. Under these considerations, Al2O3 samples were made by means of corn commercial starch consolidation that can be or not exposed to the vacuum. After sintering, the samples were analyzed according to their porosity level, mechanical strength, roughness and apparent density, showing that the use of low pressure improved these features.

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Publicado

2008-03-09

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