Why is the metal part of the metal powder injection molding injection molding it?

Metal powder injection molding (MIM) is a new type of powder metallurgy near net forming technology which combines the modern plastic injection molding technology with the traditional powder metallurgy technology. MIM products with high dimensional accuracy (+ 0.1% ~ + 0.5%), good surface finish (roughness 1 ~ 5 m), and the yield is very large. But the MIM process is more, there are certain technical barriers. Why MIM can't do a mobile phone in the frame structure / back cover larger?

First of all, MIM debinding and sintering will make the product size, product size, size deviation is larger, and not easy to skim;

Secondly, the majority of MIM stainless steel parts, although stainless steel anode, but still aluminum anode effect best (mainly because of the aluminum oxide layer by alumina composition, the formation of well ordered hexagonal tube structure, similar to the specular reflection effect, the color looks bright.

Nevertheless, there are still companies try to use MIM technology in the mobile phone / box cover, is the MIM technology to further tap! In general, at present, processing machine represents the phone boxes / cover in the high-end market; stamping represents a phone box / cover in the low-end market, the mainstream of MIM on behalf of mobile phone small parts and other metal parts.