Research On Al/C Liquid-Solid Interface Wettability And The Mass Transfer Under Ultrasonic Coupling

Aluminum is an important raw material of modern industry, people pay a lot of attention on it. It is very necessary to control the ingot casting organization in order ro produce high quality pure aluminum and deformation of aluminum alloy. Grain refinement process is an important way to obtain high quality aluminum ingots and improve the quality of aluminum. And Al-Ti-C alloy is a kind of high efficient grain refiner, it has incomparable technical advantage compared with Al-Ti-B grain refining agent. However, the issues of Al/C interface wettability and TiC synthesis are key technical problems of the preparation of Al-Ti-C grain refining agent. This research implements the Al/C interface wettability and TiC synthesis reaction through the processing of ultrasonic coupling on aluminum melt and graphite system, prepared the Al-Ti-C grain refining agent successfully, and tested the refining performance.(1) Designed water model experiments under ultrasonic standing wave field, observed the motion of particles in the liquid and liquid-solid wetting behavior.(2) Wetting experiments used the drop method with high electronic camera to obtain high-resolution drop photos, determined transient, steady-state wetting angle and contact radius of Al/C interface through the computer image processing method, draw spreading dynamics curve, analysis the behavior of Al/C interface wettabilitys and mass transfer with solvent assisted wetting and ultrasonic field coupling.(3) Added the block of graphite powder and K2T1F6in Al melt with ultrasonic coupling to the prepare Al-Ti-C alloy refining agent. Compared alloy microstructure of different temperature and different heat preservation time. Used the grain refining agent in the refining experiment, and analyzed the elaboration and attenuation mechanism.