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MIM Injection Molding Material Selection and Part Properties

MIM Injection Molding Material Selection and Part Properties

1. Selection of metal injection molding materials

The optional materials for injection molding are similar to traditional powder matallurgy materials, but the powders used for injection molding are fine and expensive, and are suitable for many alloys, steel, stainless steel, tool steel, iron, nickel, magnetic alloys, cobalt, Chromium, sintered cemented carbide, cermet, special iron alloys, tungsten polymer gold, and tungsten metal materials are very important in sintering. The sintering time is metal alloys. For example, stainless steel 316L has strength and corrosion resistance. Adding chromium during sintering is more beneficial sintering. Although expensive, the performance of injection-molded parts made in this way is better, so some powder matallurgy companies are tailor-made for parts with special output.

2. The performance of metal injection molding

MIM metal injection molding china usually has a more uniform density distribution than ordinary powder matallurgy PM, and the density remains around 98% after sintering, which is similar to castings and has very good performance. Experiments have shown that the chemical, physical, elastic, electrical and thermodynamic characteristics are relatively close.

(1) Fatigue strength and fracture toughness

Mechanical properties such as fatigue strength or failure toughness sometimes arise. High-performance materials are not an issue. But in other cases, it is better to experiment: in the case of MIM-17-4PH stainless steel, V-notch impact tests show that the fracture energy of the MIM material is only 15% of the wrought material (even if the rolled material can withstand the same sintering thermal cycle) ).

(2) Corrosion resistance

The vapor pressure during sintering is higher than that of nickel and iron, so it evaporates preferentially, reducing the corrosion resistance of MIM stainless steel and corroding deep pits with inappropriate content. The actual corrosivity depends on the metal injection molding machine manufacturer production and experimental conditions of the MIM. Experiments compared materials from different suppliers and forged materials, and the results showed that the performance of the material in the anti-corrosion test was lower than that of the forged material. Experimental results show that reducing surface roughness (due to gloss after sintering) improves corrosion resistance. Therefore, it can be speculated that after proper machining and surface treatment after sintering, MIM316 stainless steel can be used for general corrosion resistance requirements of various media like stainless steel.

(3) Biological adaptability

Metal injection molded products are often used in medical and dental applications. Because the biocompatibility of the MIM process and other methods is the same accroding to the metal injection molding process video. But doing some experiments with titanium and stainless steel showed otherwise. This is because sintering deteriorates the surface chemistry, so grinding or electrochemical treatment after sintering is required to recreate the uniform surface chemistry required for biocompatibility.

(4) Possibility to improve wear resistance

Wear experiments have shown that stiffness can be mixed into the raw material to improve wear characteristics, so it is very possible to use the MIM process to improve the wear resistance of products. For example, compared with MIM tool steel and forged tool steel treated with low-concentration quilted calcium, the dry wear rate is significantly reduced; in addition, the addition of titanium nitride or titanium bromide to stainless steel can greatly improve the wear resistance, and the product cannot Shaped using traditional metalworking methods.

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