Porogenic Behavior of Water in High-Alumina Castable Structures
Author
Source
Advances in Materials Science and Engineering
Issue
Vol. 2018, Issue 2018 (31 Dec. 2018), pp.1-10, 10 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2018-06-07
Country of Publication
Egypt
No. of Pages
10
Abstract EN
Direct casting is a processing method that can produce large parts of complex geometry.
It uses dispersions of ceramic particles in water and a hydraulic binder for consolidation.
Studies on castable structures have reported the generation of a significant fraction of pores due to the presence of water.
This effect occurs because drying preserves part of the interparticle pores originally occupied by water.
The fraction of pores obtained in these cases can reach levels higher than 50%, affecting the properties of the structure.
However, the porogenic behavior of water in these materials was not investigated in depth.
In this work, aqueous suspensions of calcined alumina and hydratable alumina (hydraulic binder) of different water contents (40–60 vol.%) were prepared in a paddler mixer.
For compositions of lower (5–35 vol.%) or higher (66–80 vol.%) water amounts, casting and curing steps were assisted by external pressure and a rotating device, respectively, to produce homogeneous microstructures.
The total porosity after drying was similar to the initial volumetric content of water in the compositions when side effects, such as sedimentation and air entrapment, were prevented.
Below water content of 25 vol.%, particles packing flaws became the main pore generator and the hydroxylation reaction of the binder no longer occurred effectively.
American Psychological Association (APA)
Salomão, Rafael. 2018. Porogenic Behavior of Water in High-Alumina Castable Structures. Advances in Materials Science and Engineering،Vol. 2018, no. 2018, pp.1-10.
https://search.emarefa.net/detail/BIM-1120255
Modern Language Association (MLA)
Salomão, Rafael. Porogenic Behavior of Water in High-Alumina Castable Structures. Advances in Materials Science and Engineering No. 2018 (2018), pp.1-10.
https://search.emarefa.net/detail/BIM-1120255
American Medical Association (AMA)
Salomão, Rafael. Porogenic Behavior of Water in High-Alumina Castable Structures. Advances in Materials Science and Engineering. 2018. Vol. 2018, no. 2018, pp.1-10.
https://search.emarefa.net/detail/BIM-1120255
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1120255