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基于传统电阻加热烧结过程的建模与模拟,通过对粉末注射成形材料微波烧结过程的机理分析,结合电磁场、热力学以及连续介质力学原理,确定了微波烧结全过程的数学模型和模拟方法;通过建立合理的力学模型和控制方程,采用COMSOL Multi-physics软件模拟微波烧结过程,并将模拟结果与试验结果进行了对比。结果表明:氧化锆粉末成形件在微波烧结初始阶段加热缓慢,当温度升至400℃之后,成形件内部温度持续急剧升高;当加热至1 360℃时,烧结件的相对密度高达92%,可满足粉末烧结工艺要求;建立的数学模型能有效模拟微波烧结过程中粉末成形材料内部的电场、温度场分布以及密度的衍化过程。
Based on the modeling and simulation of the traditional resistance heating sintering process, the mathematical model and simulation method of the microwave sintering process were established through the mechanism analysis of the microwave sintering process of the powder injection molding material, combined with the electromagnetic field, thermodynamics and the continuum mechanics theory. Reasonable mechanical model and control equation, COMSOL Multi-physics software was used to simulate the microwave sintering process, and the simulation results were compared with the experimental results. The results show that the heating temperature of zirconia powder is slow at the initial stage of microwave sintering. When the temperature rises to 400 ℃, the temperature inside the forming part continues to rise sharply. When heated to 1 360 ℃, the relative density of the sintered part reaches as high as 92% The sintering process can meet the requirements of powder sintering process. The established mathematical model can effectively simulate the electric field, temperature field distribution and density derivation process in the powder sintering process.