“Influencia del defloculante sobre la viscosidad, densidad y módulo de rotura de baldosas de arcilla obtenidas por colaje híbrido de presión-vacío”
No Thumbnail Available
Date
2024-09
Journal Title
Journal ISSN
Volume Title
Publisher
Universidad Nacional de Trujillo
Abstract
Existen diferentes metodologías para elaborar cuerpos cerámicos volumétricos como son:
prensado uniaxial, prensado, el colaje de barbotina en molde de yeso y el prensado por
filtro, sin embargo, existen distintas desventajas al momento de fabricar placas cerámicas
gruesas porque en todos ellos influyen los elevados costos de los equipos, la formación
de gradiente de densidad y contracción diferencial en la etapa de secado. Sin embargo, la
experimentación en este apartado logró aumentar la densidad y el módulo de rotura de las
muestras, sin mucho costo de fabricación.
De tal forma que, al ejecutar esta investigación, se siguió un procedimiento que inició con
el ensamblaje del sistema por colaje híbrido de presión – vacío, consecutivamente se
elaboró barbotina, considerando la cantidad de: sólidos (60%), agua (40%), porcentaje de
defloculante (0.4% de Silicato de Sodio) y el molde de acero utilizado para las muestras.
Además, la presión de colaje fue de 0.5 MPa paulatinamente realizado por el compresor,
tomando un tiempo prolongado de 20 minutos máximo para el llenado de las seis
cavidades del molde, de manera paralela se realiza la succión al vacío siendo de -0.5 MPa,
luego se dejó secar 72 h dentro del molde, posterior a ello, se retiraron las muestras del
molde para finalmente ser ensayadas por densidad (densificación) y módulo de rotura,
tomando valores de 2.31 g/cm3 y 4.6 MPa respectivamente.
Este método permitió fabricar muestras de caolín de 30 x 50 x 12.7 mm con una densidad
homogénea validando con un estereoscopio la superficie de las muestras resultando poros
de diámetro de 168.988 um para las muestras por colaje híbrido de presión – vacío,
influyendo en la posibilidad de fabricar productos cerámicos con óptimas propiedades.
There are different methodologies to make volumetric ceramic bodies such as: uniaxial pressing, pressing, slips casting in plaster mold and filter pressing, however, there are different disadvantages when manufacturing thick ceramic slabs because all of them are influenced by the high costs of the equipment, the formation of density gradient and differential contraction in the drying stage. However, experimentation in this section was possible to increase the density and modulus of rupture of the samples, without much manufacturing cost. In such a way, when executing this research, a procedure was followed that began with the assembly of the system by hybrid pressure-vacuum collagen, consecutively slips were made, considering the amount of: solids (60%), water (40%), percentage of deflocculant (0.4% of Sodium Silicate) and the steel mold used for the samples. In addition, the casting respectively. pressure was 0.5 MPa gradually carried out by the compressor, taking a prolonged time of 20 minutes maximum for the filling of the six cavities of the mold, in parallel the vacuum suction is carried out being -0.5 MPa, then it was allowed to dry 72 h inside the mold, after that, the samples were removed from the mold to finally be tested for density (densification) and modulus of breakage, taking values of 2.31 g/cm3 and 4.6 MPa This method made it possible to manufacture kaolin samples of 30 x 50 x 12.7 mm with a homogeneous density by validating the surface of the samples with a stereoscope, resulting in pores with a diameter of 168,988 um for the samples by hybrid pressure- vacuum collage, influencing the possibility of manufacturing ceramic products with optimal properties.
There are different methodologies to make volumetric ceramic bodies such as: uniaxial pressing, pressing, slips casting in plaster mold and filter pressing, however, there are different disadvantages when manufacturing thick ceramic slabs because all of them are influenced by the high costs of the equipment, the formation of density gradient and differential contraction in the drying stage. However, experimentation in this section was possible to increase the density and modulus of rupture of the samples, without much manufacturing cost. In such a way, when executing this research, a procedure was followed that began with the assembly of the system by hybrid pressure-vacuum collagen, consecutively slips were made, considering the amount of: solids (60%), water (40%), percentage of deflocculant (0.4% of Sodium Silicate) and the steel mold used for the samples. In addition, the casting respectively. pressure was 0.5 MPa gradually carried out by the compressor, taking a prolonged time of 20 minutes maximum for the filling of the six cavities of the mold, in parallel the vacuum suction is carried out being -0.5 MPa, then it was allowed to dry 72 h inside the mold, after that, the samples were removed from the mold to finally be tested for density (densification) and modulus of breakage, taking values of 2.31 g/cm3 and 4.6 MPa This method made it possible to manufacture kaolin samples of 30 x 50 x 12.7 mm with a homogeneous density by validating the surface of the samples with a stereoscope, resulting in pores with a diameter of 168,988 um for the samples by hybrid pressure- vacuum collage, influencing the possibility of manufacturing ceramic products with optimal properties.
Description
Keywords
TECHNOLOGY::Materials science