Research on Compressive Strength Changes and Mechanism of Magnesium Flux Pellets

The effect of basicity on the compressive strength of the magnesium flux pellets was studied,and based on the pore structure and microscopic morphology,the reasons for the changing the compressive strength were analyzes. The relationship between the porosity and compressive strength were established.The results show that with the increase of basicity,compressive strength of magnesian flux pellets increases firstly and then decreases.Compressive strength achieves the maximum level of 2 598 N when the basicity is 1.0.The main reason causing the compressive strength change is that with the increase of basicity,the pore diameter gradually become larger and homogeneous,and the content of liquid gradually increases.Larger pore diameter and high fraction of liquid phase result in the decrease of compressive strength.Meanwhilethe relationship between porosity and compressive strength of magnesian flux pellets was illuminated based on theory of mciro cracks.