Research&Development Of High Performance Cast Aluminum Castable

The main purpose of this paper is to develop high performance castable for casting aluminium.The high performance of castables is characterized by high construction flexibility and high thermal strength.High construction flexibility means that the pouring material can be flown freely when the amount of added water is less and the construction time can be effectively controlled.The high thermal strength means that the thermal bending and compressive strength of the castable is much higher than the former castable.This paper mainly studies the theory of particle size distribution and the action mechanism of dispersant.Andreasen equation is used to calculate the particle size gradation,then we choose the appropriate coefficient of particle size distribution to achieve the appropriate particle size distribution and determine the amount of aggregate and powder added.For the thermal strength,this paper studies the variation of the flexural and compressive strength of castables at various temperatures.We analyze the influence of the content of SiO2 micropowder and the content of Al2O3 micropowder on the flowability and high temperature strength of the castable,and obtain the optimum content of SiO2 micropowder and Al2O3 micropowder.The SEM analysis of the ore phase was carried out.The technical index of high-performance castables greatly exceeds the traditional castables,and the fluidity is good.The self-condensation time is controlled at 3-4h,and the high temperature flexural strength reaches 13.6Mpa,which has broad application prospects.A high performance castable for casting aluminium has been developed in this work.Research findings on particle size ratio of the material and construction performance of the castable:(1)Comparing the results of compression and flexural strength tests,the optimal particle size ratio should be around 0.25.(2)After sample sintering,mullite phase was formed.The mechanical properties of the castable are increased,and the structure is more compact,resulting in higher density and fewer porosity.(3)When the content of SiO2 is increased,the hot strength and the room temperature strength of the castable material for casting aluminum are significantly increased.The increase in compressive and flexural strength of the castable is very beneficial to improve its performance.(4)The materials that we developed have suitable molding,hardening and strength properties,and the castables can obtain more satisfactory comprehensive performance and service life.