磁性磨粒热压烧结过程的温度场模拟

针对以Fe粉和Al2O3粉为原材料的两相复合磁性磨粒这一研究对象,建立了磁性磨粒热压烧结过程的传热模型,通过计算机模拟方法对模具温度场进行分析,从而优化热压工艺。模拟结果表明:炉体的升温速率对模具的温度场影响较大,同时磨粒在模具中的位置不同其温度场分布也不同。综合磨粒的制备效率和实验设备的要求,本实验条件下应采用在低温区为10～15℃/min、高温区为5～10℃/min的升温速率,并将磨粒置于模具中的z5区域,以降低热压成形过程中磨粒的轴向温差,改善磨粒的物理力学性能。

Temperature Field Simulation of Magnetic Abrasive Hot Pressing Process

Based on two-phase composite magnetic abrasive prepared from Fe powder and Al2O3 powder,heat transfer model of its hot pressing process is built.Mould temperature field is analyzed by computer simulation,and then the hot pressing process is optimized.Simulation results show that furnace heating rate have a great effect on mould temperature field,and temperature field distribution of the abrasive in different mould location is also different.In view of abrasive preparation efficiency and laboratory equipment requirements,the heating rate is determined to be 10~15 ℃/min at low temperature and 5~10 ℃/min at high temperature.And abrasive should be placed in z5 region of the mould,in order to reduce its axial temperature difference in the hot pressing forming process and improve its physical and mechanical properties.