Preparation Of High Purity Aluminum Segregation Equipment R & D And Technology Exploration

With the rapid development of science and technology, the requirements for industrial products has not only limited to the functionality, appearance and texture become the pursuit of a higher.Excellent physical and chemical properties, light weight, abundant, and has been widely used in aluminum in people’s lives, more and more people are paying attention.At the same time, parts of raw materials of high purity aluminum as a large number of applications in the high-tech products, along with the growing popularity of high-tech products, has become an important functional materials, subject to the attention of the aluminum industry at home and abroad.However,high purity aluminum industry in China is still the application of high energy-consuming, inefficient, backward three-tier method of high purity aluminum, in segregation law regardless of the level of equipment and research process far behind the foreign industry.This article describes the various preparation of high purity aluminum, analysis and comparison of the pros and cons of the three-point method and the segregation, the preparation of high purity aluminum. Detailed analysis of the principle of segregation preparation of high purity aluminum:Aluminum alloy grain impurity element segregation phenomenon after melting, the degree of segregation of impurity elements depends on the equilibrium partition coefficient. By reference to the literature, that the the Al impurity element Fe and Si content exceeds80%of all the impurity element contained Therefore, as mentioned herein, and an impurity element analysis for Fe and Si. Also, elaborated the principle of segregation prepared by the method of high purity aluminum and comparative analysis of the pros and cons of the various methods of segregation preparation.References and ask for help of the industry experts, on the basis of the germanium crystal furnace, transformed into the first set of crystal pulling experiment platform. The experimental platform through the PLC chip link the infrared temperature measurement system frequency heating control cabinet, real-time control the temperature of the furnace, the solid-liquid interface stable growth in order to protect the cellular dendrite normal nucleation, growth. Use the platform, the author and the respective teams successfully purified4N levels of high purity aluminum, and worked out the operating procedures of purification of high purity aluminum in the platform, its Fe, Si purification rate run up to the theoretical maximum.In the first generation of experimental platform for three months experiments, the pulling-up method can not circumvent the experimental error, such as,the pulling rod to overcome the gravitational force pulling up, will inevitably bring about the disturbance of the solid-liquid interface, affect cellularnormal grain growth; Worn aging furnace interior gas atmosphere is difficult to control and can not avoid the problem of the surface of the molten oxide appears,. Therefore, it is necessary for us to design and manufacture the second generation of segregation method using the pulling-down method of purification and preparation for high purity aluminum equipment.When we disign the purification equipment of high purity aluminum in the design of the second generation, focusing on considerations of the dummy head and the water-cooled copper mold design, intended to protect the crystal pulling process does not appear to leak hazardous situation, at the same time, to protect the entire crystal pulling processsmooth. Increase in the design of high-purity graphite crucible size, so that the crystal pulling experiments certain guiding significance for industrial production; increase the tilt-like medium frequency induction coil to ensure the efficiency and aluminum melting furnace room temperature gradient. Taking into account the stable performance of the other member in the first generation devices, these portions are retained in the design.At present, the second generation of pulling-down purification of high purity aluminum equipment has been put into research and experimental work, stable operation, pull-down purification of high purity aluminum experiment is going on smoothly.