Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
MECHANICAL AND THERMAL BEHAVIOR OF REFRACTORY CERAMIC COMPOSITES WITH SUBSTITUTION OF RICE HUSK ASH
Submission Author:
Camila Cardoso , RS
Co-Authors:
Charles Cenci, Camila Cardoso, Juliana Quevedo, Marco Antonio Durlo Tier, Ederli Marangon
Presenter: Camila Cardoso
doi://10.26678/ABCM.COBEM2019.COB2019-1899
Abstract
Rice husk ashes are agroindustrial residues produced on a large scale after the burning of rice husks for energy generation. The combustion of rice husks in a fluidized bed, with temperature control, is an efficient method to obtain the ashes, rich in silica in the amorphous state, becoming a substitution alternative for the production of refractory ceramic composites. This study aims to obtain refractory ceramic composites with good performance from the use of rice husk ash since this is a low-cost residue and does not yet have adequate disposal. Thus, percentages of 10, 15, 20 and 25% by weight of kaolin clay were substituted for rice husk ash for the production of the composites. For these composites, the thermomechanical properties were evaluated from the compression, three-point flexural and thermal shock tests. The results showed that the composites using substitution showed no improvement in the mechanical compressive behavior and the 10% substitution maintained the levels of tensile strength at three-point flexure. In relation to the thermal shock strength, all composites showed rupture in the first cycle of the test, evidencing a possible formation of internal stresses in the material, besides suggesting the necessity to reduce the aggressiveness of the test.
Keywords
Rice husk ash, refractory ceramic composites, Thermomechanical Behavior
