The oxide layer has advantages such as high temperature resistance, oxidation resistance, density, wear resistance, corrosion resistance, and good bonding strength with the substrate. It can effectively delay the adhesion and melting damage of liquid metal to the surface of die casting mold materials, especially for die casting molds that are prone to corrosion.
The oxide layer surrounding the mold plays a role in isolating the hot molten metal or high-temperature liquid from thermal erosion, protecting the integrity of the mold material matrix, and thus improving the service life of the mold.
From a microstructural perspective, the oxide layer is rough and uneven, so it can also store some coolant, which facilitates demolding after casting die casting, plays a lubricating role, and makes the surface of the mold less prone to oxidation and corrosion grooves, thereby reducing the factors that induce heating fatigue cracks.
Combining controllable nitriding/carbon co infiltration with oxidation can make the surface black or dark more attractive, thus gaining the favor of customers.
