MIM Process
Metal injection molding (MIM) is a typical cross-disciplinary product that combines two completely different processing technologies (plastic injection molding and powder metallurgy).
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How is MIM products’ density and strength?
Theoretically, typical MIM density is above 98%. Specific density characteristics depends on the choice of materials, but MIM density is close to precise material.
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In the process of removing binder, will those parts shrink?
No, the volume of parts will not change in the process of debinding, but parts will shrink 20% during sintering.
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Is there any difference between MIM and normal powder metallurgy?
Traditional PM presses rough powder into a fixed position by one-way high pressure, creating moderately complex equipment. Particularly, if we do nothing to improve its density in the process of sintering, density value between 80-90%, it will limit its physical properties as alloy. Due to the elasticity of MIM, it will not bring into any restriction to manufacturing complex products. Fine metal powder and high temperature sintering make final products produced by MIM achieve high density. This also makes MIM products have similar features with precision materials.
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Is metal melted in the process of forming?
No, the only thing that melted during the process is binder, it therefore makes powder flow freely like plastic material. Parts get certain strength by cooling the binder. After sintering, parts can have high density, which is enough to meet the demand of mechanical properties.
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How to operate MIM?
Raw material is a mixture of fine metal powder and binder. When heat raw material, it will change to thickened and pulpy mixture, then to be injected into molds and form models. After cooling, we get it out from molds and reprocess to remove binder (called degreasing). Lastly, we put it under manipulated high temperature, metal powder is melted and formed tight solid.
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What is MIM Technology?
MIM is a technology combining injection molding and powder metallurgy.
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Why do you use MIM?
MIM has the advantage in manufacturing fine and highly complex parts. These parts are difficult to use traditional machining or casting technology because of the high costs.
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What materials can be applied to MIM?
Most of the metal alloys are available in the MIM process。Typical alloy includes high strength steel, nickel and stainless steel and super alloy. Other materials covers refractory alloy, titanium and copper alloy. Low melting point alloy refers to brass, bronze, aluminum and zinc, but these are not applicable to MIM considering cost. If wanna know more, you can look over the table of material selection.
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