Metal injection molding is a high-tech technology derived from plastic injection molding.
MIM of plastic injection molding, high polymer chemistry powder metallurgy and metal materials, and other disciplines. Powder metallurgy can take advantage of the billet mold injection molding parts, by degreasing, sintering, and rapid production of high-density, high-precision, complex shape metal structural parts, to quickly and accurately ideas materialized into a certain structure and functional properties of metal products in order to achieve high-volume, large-scale production.
Powder metallurgy thanks to a large amount of binder as a means to enhance flow, like injection molding can process arbitrarily complex metal parts, this is impossible to achieve by traditional molding of powder metallurgy; Powder metallurgy is a kind of net-shape forming technology, with almost no subsequent processing, parts manufacturing cost is greatly reduced, so need dozens of machining process that can obtain a forming production parts. In addition, the uniformity of flow during injection molding filling cavity and making the metal injection molding products everywhere density is very homogeneous, eliminating the inevitable in the powder metallurgy mold process of density inhomogeneity. And as a result of micro-powder, the product can reach very high density after sintering, thus, the mechanical properties of MIM products are generally superior to the molding process and precision casting and processing of the resulting product and was internationally hailed as “one of the most popular parts forming technology”
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The erosion environment is complex and is associated with multiple factors, including the test fluid and some details such as ventilation (gas), PH, concentration of halogen ions, contact with other materials, etc. Accordingly, any discussion of PIM material’s environmental tolerance should include from sintering microstructure, heat treatment, and test conditions to the details such as the quantitative measurement of corrosion resistance. For this, it will highlight the material behavior and success. For many applications, it is best to PIM test specimens to the target use environment to ensure the performance of the material.
PIM alloy has been considered as knee and hip implants in an extreme case, Cobalt – chromium alloy has been used in these applications in the field of testing, but has not yet been put into use. In addition, it has carried on quantitative antibacterial testing, an important finding is added in the PIM304L stainless steel mass fraction of 3% copper can inhibit the growth of bacteria. This is the situation of PIM can according to the application of materials change its chemical composition. Also, there are other biocompatibility materials testing, including tantalum, titanium, hydroxylapatite, and titanium hydroxyapatite composite material. The latter is used for animal testing. No nickel stainless steel artificial saliva tests show that the nickel release rate can be two orders of magnitude lower than ordinary stainless steel. Therefore, early data is good, but before being put into the PIM implant products also needs more tests. Stainless steel and titanium is usually used as a corrosion-resistant material, but some areas also use pure nickel. Alumina ceramics under acidic conditions, such as corrosion resistance, but in alkali solution erosion. The corrosion resistance of the PIM material tests shows that its performance is usually fair and forging materials. Impurities can reduce the corrosion resistance of the material, but the sintering can make volatile impurities out, therefore, the PIM materials show that corrosion resistance is usually better than another processing method.
The corrosion resistance of the test the PIM products is mainly directed against the stainless steel. PIM processing of stainless steel with austenitic, ferritic, and martensitic precipitation hardening or different levels, such as the material having at least a mass fraction of 12% chromium. 300 grades of austenitic stainless steel, its good corrosion resistance, excellent toughness and non-magnetic etc, are widely used in consumer products. Most of all stainless steel, the PIM applications are 17-4 pH (AISI630) levels of precipitation hardening stainless steel. The mechanical properties of stainless steel can be sintered after heat treatment in a wide range of adjustments, which makes its application range from magnetic sensors to surgical tools. 400 grades of stainless steel alloying degree is low, but can produce high strength products, including cars, turbochargers, the cutter blade, and other parts. This kind of corrosion resistance of stainless steel is the worst in the PIM stainless steel.
The corrosion resistance of metal injection molding of stainless steel is accomplished by means of salt spray test, immersed in artificial sweat (artificial time!), artificial spit liquid (artificial saliva), boiling water, copper sulfide (copper sulfate), nitric acid (nitric acid), hydrochloric acid (hydrochloric acid), acid (sulfuric acid), drift chlorine water (chlorine bleach) and ferric chloride, (ferric chloride).In addition, the original electrochemical grinding is used to characterize the passivation collapse and pitting. When corrosive becomes a major focus, PIM of 316L is the most commonly used stainless steel, but if you need a higher intensity, PIM17-4PH can be used. Method of PIM ph stainless steel made in 17-4 tests show that the corrosion resistance and forging materials. Two kinds of PIM stainless steel products in the corrosion resistance of two kinds of solution are better than the forged stainless steel.
Harber Metal Group was founded in 2014 and is a national high-tech enterprise integrating R&D and production of powder metallurgy. The MIM company has set up an R&D center, testing center, metal powder forming (PM) division, powder injection molding (MIM) division, and other industrial supporting facilities. It is a specialized, refined, special, and new enterprise in Guangdong Province, an innovative enterprise in Guangdong Province, a science and technology small giant enterprise in Dongguan City, a director unit of Guangdong Powder Metallurgy Industry Technology Innovation Alliance, and an initiator of Dongguan Advanced Powder Metallurgy Cluster Promotion Center.
