MIM stainless steel feed for middle frame of mobile phone and preparation method of product made of MIM stainless steel feed

Abstract

The invention relates to MIM stainless steel feed for a middle frame of a mobile phone and a preparation method of a product made of the MIM stainless steel feed. The MIM stainless steel feed comprises the following components: stainless steel mixed powder and a forming agent, wherein the stainless steel mixed powder and the forming agent are combined according to a weight ratio of (90-92):(10-8);the stainless steel mixed powder comprises stainless steel composite powder and silicon carbide crystal whiskers; and the stainless steel composite powder comprises leaf-shaped powder produced through the water atomization process and spherical powder produced through the water atomization process. The MIM stainless steel feed provided by the invention has the advantages that a raw material is combined with metal powder which has different shapes, specifications and components, and a polymer forming agent with reasonable components is matched for the combination, so that the high fluidity, the low deformation possibility, the high glossiness and the high hardness of the MIM stainless steel feed can be achieved.

Description

technical field [0001] The invention relates to a preparation method of MIM stainless steel feeding material suitable for the middle frame of mobile phones and its products. Background technique [0002] With the continuous advancement of social science and technology and the vigorous development of global industrialization, the powder metallurgy injection molding process has developed rapidly due to its many advantages, and its technology has been widely used in military, transportation, machinery, electronics, aerospace, aviation and other fields . [0003] MIM feeding is the core process of metal injection molding product preparation. It is the process of mixing metal powder and molding agent uniformly under a certain temperature condition according to a certain ratio, and then cutting, granulating and cooling into individual particles, and feeding the particles. . [0004] Stainless steel is one of the most widely used raw materials in the powder metallurgy industry. D...

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Problems solved by technology

[0004] Stainless steel is one of the most widely used raw materials in the powder metallurgy industry. Due to its advantages of corrosion resistance and high strength, it is widely used in the mobile phone electronics industry. Among them, stainless steel mobile phone middle frame products have unique material performance requirements. 316L stainless steel, 304L stainless steel, etc. cannot meet the requirements. In the absence of suitable grades of materials to choose from, it is imminent to research and develop new stainless steel materials. With the gradual application of new stainless steel materials, the middle frame products of mobile phones can gradually be used The traditional machining process has been upgraded and replaced by the low-cost MIM process. It is the current highlight product in the MIM industry. The advantage of the MIM process is the production of smaller product parts. For larger products such as mobile phone frames, There are still certain difficulties, especially the injection molding, degreasing and sintering of the product. Because the product is relatively large, no matter it is in molding, degreasing or sintering, it will bring certain difficulties, and it is easy to cause product cracking and large differences in deformation and size. Waiting for bad