For a specific casting, if the mold coating is selected properly, the application operation is stable and controlled. In theory, qualified castings can be obtained. However, in the actual casting process, the application operation is often regarded as the most variable link. Therefore, it is very important to carefully prepare the mold before coating and prepare the coating and choose the application tools used.
The applied substrate is extremely important to the performance of the coating. The new mold must be thoroughly cleaned before application to remove all lubricating grease and rust spots. The used mold must be completely removed from the original coating. The traditional method of cleaning the mold is to use a wire brush to remove surface dirt. This method often causes excessive wear on the mold surface or produces small cracks on the mold surface. Therefore, people are looking for new non-destructive cleaning methods to clean metal surfaces.
The cleaned mold should be evenly heated to about 300-350°C. The heating method often uses gas burners to make the flame evenly distributed in all parts of the mold.
When applying, the mold temperature should usually be cooled to about 180°C first, and the base coating usually adopts an aqueous solution containing a surfactant or a highly diluted coating, which can improve the adhesion of the coating to the mold surface.
Before applying the mold coating, the original paint should be stirred evenly and diluted to the required concentration and viscosity. If the application time is long, during the application process, the viscosity and concentration of the coating, coating thickness, and mold temperature must be measured and adjusted regularly.
Our company AdTech provides mold coatings, including boron nitride coatings, refractory mortar repair materials, aluminum ingot mold coatings.
Boron Nitride Coating (BN series): It is a kind of liquid active boron nitride protective coating with good effect. It can be mixed with water and applied to fused silica lining, standpipe, refractory casting material, brick lining, float, flow Grooves, various ladle and metal tool surfaces, especially suitable for the surface of ceramic products such as shunt discs, runners, filter boxes, degassing boxes for hot top casting, and play a good non-stick aluminum coating protection effect.
Refractory Mortar repair material: a white filling molding material very suitable for the hot top casting industry. It can be widely used in the paste of aluminum liquid runners and shunt plates and as a filling material. It can also be widely used on various ceramic refractory materials in contact with molten aluminum, and has a good heat preservation and sealing effect. It can be used as sealing repair material for furnace lining or refractory board. It can also be used to fill the protective layer of the automatic casting spoon.
Characteristics of aluminum ingot mold coating:
- Protect metal molds and extend mold life.
- Facilitate the demoulding of castings and prevent adhesion and oxide accumulation.
- Control the heat flow transferred from the casting alloy to the metal mold.
- Improve the surface finish of castings.