Detailed description of metal powder injection forming sintering technology

Since the birth of sintering technology more than 1,000 years ago, it can be applied to many industries, from the widely known ceramic industry to the pink injection molding industry.

The sintering process is mainly divided into three stages

In the initial stage, middle stage and final stage

After the sore embryo injected by the injection machine is removed, most of the adhesives (POM) are removed, and a small amount of high -temperature bonding agent is still retained to maintain the shape of the product. These residual high -temperature bonding agents are removed by heating to 600 degrees in the sintering furnace. This stage is different from acid -degradable at this stage. It is called the stage of heat -dehydration and also known as pre -sintering.

In the initial stage: the metal powder particles in the embryo body after completely skipping start forming a sintering neck from the contact point and growing up

Middle phase: Growing up the neck of sintering neck, the gap between metal powder particles gradually decreases, forming a pore network connected to the crystal world

Final stage: The pores between particles finally become closed and independent stomachs, product molding

During the sintering phase, due to the great decrease in the gap between the particles, the product volume contraction and the intensity increased. The advantages of powder injection molding are reflected here: because the product's raw embryo is mixed with metal powder and binders in a certain proportion, and the ingredients on each part of the raw embryo are even uniform, so that it can be built -in when sintering, so that it can be sintered. To ensure that the product can be shrinking in all directions, it is a good guarantee to ensure the shape and size and accuracy of the product. This is also a feature of MIM.

With the innovation and progress of technology and technology, material processing technology is developing in the direction of high performance, low cost, short process, and close -up molding. Powder injection molding technology