Important Point Of MIM Technology —Debinding
Debinding process is the most important stage of MIM technology, which determines the quality of the final product. Because the majority of defects in metal parts are formed in the debinding stage, such as cracks, pores, deformation, bubbling and so on. And these defects generated can not be made up by the later sintering stage.
In the debinding stage, when the vacuum degree in furnace is lower than 1 Pa, vacuum while introducing inert gas to maintain the pressure between 150 ~ 200Pa.
Start heating to raise the temperature to 200 ~ 800 ℃ to gasify the lipid additives of the sintered blank parts, so that the lipid additives is discharged by the inert gas.
Raise the temperature to 200 ~ 800 ℃ at a speed 50 ℃ / min and keep it warm for 30 ~ 240Min.
The lipid additives gas enters the spiral condensing pipe to cool the gas at less than 100 ℃ along the cooling air passage, and recover the lipid additives and inert gas.
MIM(Metal Injection Molding) is a forming method by injecting the plasticizing mixture of metal powder and binder. It can be consist of 4 steps: 1, Mix the powder and binder, and then pelletize the mixture; 2, Injection molding; 3, Remove the binder to get the 100% metal parts; 4, The last is sintering. Some sintering products may need to do further densification processing, heat treatment and machining. Sintered products not only have the same complex shape and high precision as plastic injection forming, but also have similar physical, chemical and mechanical properties as forged parts.
