Metal injection molding (MIM) has become a common production method in recent years, most of the products of the automotive, medical, electronics and consumer sectors are produced with this molding method. When you want to produce metal parts in different shapes, you can resort to various methods, such as die casting or powder metallurgy (called a heap of solid particles with a size of less than 1 mm).
Metal injection molding technology (MIM), on the other hand, is a different and new production method in the production of metal parts. It mixes the metal powder of the product to be made with the joining materials, ensures that the materials used are formed into the desired shape, then removes the combining materials and applies the sintering process (sintering is the process of creating and compressing a solid material with heat or pressure melted before it reaches the liquefaction point).
Metal injection molding technology can produce complex shaped metal parts with a wide variety of metal materials, including steel, stainless steel, copper, titanium and high temperature alloys.
Metal powder used in metal injection molding typically has particle sizes with a pore size of 20 µm and is smaller than the powder used in the conventional molding process. The powder mix contains much higher ratios of binder and flow agent. In this method, binders usually include various thermoplastics. The prepared composite material is injected into metal molds with one or eight cavities by conventional plastic injection molding machines. The molded component material is called the green part. Binding materials are first removed by heating, solvent extraction or a combination of both methods, and the process of removing about 80 percent of binders is applied. The time in the thawing process is directly related to the wall thickness. After separation, the parts are porous and brittle, the mold size remains the same as during molding, and this part is called brown part. Then the brown parts are sintered in the next process as in the method applied in conventional powder metallurgy. This process, on the other hand, means heat application in a vacuum or inert atmosphere furnace at a very high temperature, depending on the material used. However, the sintering method generally takes place well below the melting point of the material.
The metal injection molding process, including the entire process and the delivery time of the product, takes approximately 24 to 36 hours.