The Experiment Research On Low-voltage Electromagnetic Two-directional Compaction Of Function Ceramics

Function ceramics have been received extensive applications as the most important materials in the high-new technology. Function ceramics' forming especially compaction is a very important process, which directly affects the performances of its products.At present, function ceramics are usually made by sintering after static compaction, it is very difficult to improve its density, and some bugs which are brought during the forming process are very difficult to eliminate only by sintering. All this can directly affect the quality and performances of its products. So exploring new compaction technology for high density and high performance function ceramic is a key factor to promote the applications and developments of function ceramic materials.Powder low-voltage electromagnetic compaction is a high energy and high speed forming method, which uses the impulse electromagnetic force to compact the power. This method is an effective way to form high density and particle dimensional-uniformity products.Using the low-voltage electromagnetic two-directional compaction technology to form the function ceramics is a new research. Based on the analysis of domestic and oversea situation of function ceramics powder compaction, the pre-compaction forming technology of the function ceramics and the low-voltage electromagnetic unilateral compaction research results, we use the finite element analysis software (ANSYS) to simulate the three physical fields of the indirect forming process which are the circuit, electromagnetism and structure, reveal the mechanism of the low-voltage electromagnetic two-directional compaction and discuss the influence of the electrics-mechanics factors and the technologic parameters to the products' density and its distributing. On this research, we use the WG—III low-voltage electromagnetic forming machine to compact several kinds of electronic ceramics , systematically analyzed the effects of technologic parameters such as discharge voltage, discharge times, aspect ratio and shaping method to the products' density and its distributing. In addition, SEM was used to analyze the effects of compaction parameters on interior structure of ceramics after sintering, and the electrical performances of ceramics were tested. We analyzed the effects of circuit parameters and the shaping method to the interior structure and performance of the ceramics' products.The experiment results showed that , low-voltage electromagnetic two-directional compaction technology is an effective method to obtain high-density ceramics. In the range of proper circuit parameters, low-voltage electromagnetic two-directional compaction can improve the sintering character of ceramic body, thereby increase the density of ceramic products. In contrast with static compaction and low-voltage electromagnetic unilateral compaction, two-directional compaction can increase the sintering density of ceramic products, improve the interior structure and electrics performances.