镁质熔剂性球团抗压强度变化规律及机理研究

Research on Compressive Strength Changes and Mechanism of Magnesium Flux Pellets

研究了碱度对镁质熔剂性球团抗压强度的影响,并基于孔结构及显微形貌分析了抗压强度变化的原因,建立了孔隙率与抗压强度之间的关系。结果表明:随着碱度的提高,镁质熔剂性球团的抗压强度先升高后降低,并在碱度为1.0时达到最大值为2 598 N。强度变化的主要原因为随着碱度的提高,孔径变大且逐渐均匀化,液相含量逐渐提高,而孔径过大和液相量过多则导致抗压强度降低;同时,在微裂纹理论基础上,阐明了镁质熔剂性球团的孔隙率与抗压强度之间关系。

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.