Injection molding method of high-strength aluminum alloy turbine impeller

Abstract

The invention discloses an injection molding method of a high-strength aluminum alloy turbine impeller and belongs to the technical field of preparation of aero-engine turbines. The method comprises raw material preparation, adhesive matching, primary smelting, secondary smelting, injection molding, solvent debinding, thermal debinding, sintering, solid solution treatment and aging treatment. Withthe adoption of the method, the mechanical performance of the turbine impeller alloy is improved substantially through component homogeneity improvement, grain refinement and the like, and the strength can meet the use requirement of the turbine impeller of an aero-engine.

Description

technical field [0001] The invention belongs to the technical field of aero-engine turbine preparation, and in particular relates to a high-strength aluminum alloy turbine impeller injection molding method. Background technique [0002] The superalloy turbine is the core part of the aero-engine turbocharger, and its performance directly determines the energy-saving and emission-reduction effect of the turbocharged engine. The supercharged turbine is subjected to high temperature and high speed rotation and the alternating stress caused by the impact and vibration of the blade airflow during service, and is prone to fatigue damage. Therefore, there are strict requirements on the quality of the turbocharged turbine. For a long time, investment precision casting has been the main forming method of supercharged turbines. Since the casting process cannot completely avoid casting defects such as non-metallic inclusions, pores, shrinkage cavities, and element segregation, the furth...

AI Technical Summary

Problems solved by technology

For a long time, investment precision casting has been the main forming method of supercharged turbines. Since the casting process cannot completely avoid casting defects such as non-metallic inclusions, pores, shrinkage cavities, and element segregation, the further improvement of turbine life is largely limited.

Metal injection molding technology (MIM) does have some incomparable advantages compared with traditional processing methods, and can overcome the casting defects that are inevitable in the precision casting process, but the main reason that limits the development of MIM technology is: MIM technology needs to add binders and degreasing process limitations, even to a certain extent, MIM technology can solve the problem of one-time shaping of complex shapes, but it can only be used on product parts with low precision, small size, and low mechanical performance requirements, which is not suitable for application Parts with high mechanical performance requirements