Does silicon content affect the selection of die casting release agents?
Yes, it does. Silicon content primarily influences the choice of die casting release agents by affecting the fluidity of molten aluminum alloy.
How exactly does silicon content, via its impact on fluidity, shape the selection criteria for die casting release agents?
This influence manifests in two key aspects: the release agent’s heat resistance and its heat retention property.
First, consider heat resistance. For example, ADC6 has poorer fluidity than ADC12. To ensure proper casting formation with lower-fluidity alloys like ADC6, manufacturers often need to increase both mold temperature and molten metal temperature. This raises the overall temperature of the die-casting cavity, imposing higher requirements on the release agent’s film-forming ability at high temperatures. If the release agent lacks sufficient heat resistance and decomposes rapidly under such conditions, it may fail to form an effective barrier, leading to aluminum sticking (a common defect where molten aluminum adheres to the mold).
Second, heat retention becomes critical for thin-walled or ultra-thin castings. Some aluminum alloy ultra-thin parts are prone to "cold shut" issues—defects caused by insufficient molten metal flow due to rapid heat loss. Here, the release agent must minimize heat transfer from the molten aluminum, effectively "locking in" heat to maintain fluidity and ensure complete cavity filling. A release agent with poor heat retention would accelerate cooling, exacerbating cold shuts.
What is the key to selecting a suitable die casting release agent?
A good die casting release agent is not chosen in isolation but through a comprehensive evaluation of three factors: alloy type, mold characteristics, and specific working conditions. By matching these elements to your factory’s production needs (e.g., alloy fluidity, part geometry, cycle time), you can optimize performance, reduce defects (like sticking or cold shuts), and ultimately enhance quality and efficiency.
For more information about Does silicon content affect the selecting die casting release agents? or die-casting auxiliary materials, and if you need customized die-casting release agent, please contact 15021483232 (same as Wechat)
