Common Defects in Die-Casting: Mold Sticking Issues Mold sticking defects in die-casting are very common in actual production. They directly affect the appearance of the product and, in severe cases, can cause the surface of the casting to peel, lose material, or suffer from scratches and cracks. For castings that require sealing, severe mold sticking can lead to local air leakage, causing the casting to be scrapped. 01 Causes of Surface Defects The essence of mold sticking defects is the combination of the die-cast alloy and the steel mold, with casting material sticking to the mold surface. During the die-casting process, the molten metal enters the mold cavity, creating strong physical impact and chemical corrosion on the mold surface. The physical and chemical interactions between the molten metal and the mold cause small pits to form on the mold surface. Each injection causes changes to the mold surface, with the pits gradually enlarging over time. Once the pits reach a certain size, the aluminum liquid enters and combines with the steel mold. The mold surface originally has a dense oxide layer, but after this oxide layer cracks, aluminum starts to penetrate, forming intermetallic compounds of Al-Fe-Si. These compounds grow into the steel by diffusion, a process controlled by time and temperature. At this point, aluminum sticking defects become apparent. 02 Molds and Surface Coatings For molds, aluminum sticking is a complex process of mechanical wear and chemical reactions that cause significant damage to the mold surface. In severe cases, it can lead to mold failure. Therefore, molds need to use high-quality materials and undergo proper surface treatments to effectively reduce aluminum sticking. Role of Boron Nitride Coatings Boron nitride coatings can form a protective layer on the mold surface, providing the following benefits: - Lubrication: Reduces friction and impact of the molten metal on the mold surface. - Non-Wetting: Prevents the molten metal from sticking to the mold surface. - Corrosion Resistance: Protects the mold surface from chemical corrosion by the molten metal. - High Wear Resistance: Extends the service life of the mold. Using boron nitride coatings can significantly reduce the occurrence of mold sticking defects during die-casting, improving the quality of the castings and extending the life of the molds. If you have any questions about Boron Nitride ，feel free to connect with me！You can also click on our official website to contact us.
Mold sticking defects in die-casting are very common in actual production. They directly affect the appearance of the product and, in severe cases, can cause the surface of the casting to peel, lose material, or suffer from scratches and cracks. For castings that require sealing, severe mold sticking can lead to local air leakage, causing the casting to be scrapped.
01 Causes of Surface Defects
The essence of mold sticking defects is the combination of the die-cast alloy and the steel mold, with casting material sticking to the mold surface. During the die-casting process, the molten metal enters the mold cavity, creating strong physical impact and chemical corrosion on the mold surface. The physical and chemical interactions between the molten metal and the mold cause small pits to form on the mold surface.
Each injection causes changes to the mold surface, with the pits gradually enlarging over time. Once the pits reach a certain size, the aluminum liquid enters and combines with the steel mold. The mold surface originally has a dense oxide layer, but after this oxide layer cracks, aluminum starts to penetrate, forming intermetallic compounds of Al-Fe-Si.
These compounds grow into the steel by diffusion, a process controlled by time and temperature. At this point, aluminum sticking defects become apparent.
02 Molds and Surface Coatings
For molds, aluminum sticking is a complex process of mechanical wear and chemical reactions that cause significant damage to the mold surface. In severe cases, it can lead to mold failure. Therefore, molds need to use high-quality materials and undergo proper surface treatments to effectively reduce aluminum sticking.
Role of Boron Nitride Coatings
Boron nitride coatings can form a protective layer on the mold surface, providing the following benefits:
- Lubrication: Reduces friction and impact of the molten metal on the mold surface.
- Non-Wetting: Prevents the molten metal from sticking to the mold surface.
- Corrosion Resistance: Protects the mold surface from chemical corrosion by the molten metal.
- High Wear Resistance: Extends the service life of the mold.
Using boron nitride coatings can significantly reduce the occurrence of mold sticking defects during die-casting, improving the quality of the castings and extending the life of the molds.
If you have any questions about Boron Nitride ，feel free to connect with me！You can also click on our official website to contact us.
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