Study On Simulation And Research On Forming Mechanism In Low-voltage Electromagnetic Compaction Of Function Ceramics

Powder compaction is a very important process during the fabrication of function ceramic, which makes decisive effect to the properties of products. After applying the technology of low-voltage electromagnetic compaction into making metal powder products, we tried to introduce this technology into the compaction of ceramics powder. The experiment results showed that this method can be used to press the ceramics powder efficiently, and improve the product's properties. While, this method refers to three physical fields, including circuit, electromagnetism and structure, there are so many parameters in the compaction process;only with the method of experiment to get the influence of each parameter on sample's properties is not economical. To solve this problem, this article uses the finite element analysis software ANSYS to simulate the process of low-voltage electromagnetic compaction on functional ceramics powder in the mode of indirect way. According to the three physical fields during the compaction, the whole simulation also contains three parts;with the systemically analysis of each part to detect the influence of each parameter on the compaction results.In the analysis of the circuit, the differential equation based on the theory of electromagnetism had been established;the circuit qualitatively had been analyzed, and the current on the coil in the process of experiment had been calculated. Moreover, by the means of simulation, the influence of circuit parameters on the current wave were investigated.During the analysis of electromagnetism, we obtained the electromagnetic force expression through numerical analysis;by the simulation, we got the distribution of the electromagnetic force, furthermore we also discussed the influence of circuit and structure parameters on electromagnetic force.With the analysis of structure, Drucker-Prager material option had been used to establish the function ceramic power material modeling, according to the structure properties and dynamic parameters, the compaction process had been simulated. After obtaining the result of the simulation, the stress in the products had analyzed, the locomotions of the powder element during the compaction (Including displacement, velocity, and acceleration) had been discussed, and the influence of voltage andcapacitance on the powder element's locomotion had been analyzed in addition.Through a great amount of simulations, we compared the simulation result with the experiment data, and validated the correctness of the simulation. In addition, associating the simulation result with the experiment data, we analyzed the influence of each molding parameter on product's density, and expounded the influence of these parameters on the powder pressing density.