The draft angle is a slope designed on both sides of the mold cavity to facilitate demolding.There is a difference between the draft angle for MIM and injection molding because MIM must address the fragility of the green part and sintering shrinkage, so a larger draft angle (1°–5°) is required; while injection molding only needs to overcome demolding friction, so a small draft angle (0.5° to 2°) is sufficient.The draft angle should be determined ··· More

Answer: Yes. Gates and sprues are made from the same feedstock as the product, making them theoretically recyclable. And it is economic and environmentally friendly: Recycling reduces raw material costs (metal powder accounts for 40%–60% of costs) and reduces waste.Recycling Process and RequirementsStepOperational RequirementsRisk ControlCollectionRemove gates/sprue (before debinding) during the green stageAvoid contamination (dust··· More

Key functions of gates in MIMGuide and control melt flowPrevent backflowManage filling speed and patternInfluence part strength and sintering behaviorAffect final part appearance (gate vestige)Common gate types in MIMTypeProsConsBest ForDirect GateLow pressure loss; good for thick partsLarge vestige; high stressLarge structural partsEdge GateSimple; adjustable; easy removalVisible side marksFlat/box-shaped partsPoint GateSmall marks; auto-removal··· More

Causes:During the debinding process, the binder is removed, and the part's density typically falls below 70%. The purpose of sintering is to densify the powder and eliminate most of the pores, with the density typically reaching over 95% of the theoretical density after sintering. Therefore, during sintering, the green compact undergoes 10%–20% shrinkage, resulting in significant changes in dimensions. This can lead to issues such as warping ··· More

Mechanism:During sintering, oxides or nitrides form on the surface of parts, causing discoloration. This is a clear indication of an issue with the sintering atmosphere. To prevent this, the metal surface must not react with the sintering atmosphere to form reaction products such as oxides or nitrides during sintering.Causes:High oxygen content in the sintering atmosphere → High-temperature reactive metal powders form metal oxides on their surfac··· More

(Background: The defects that arise after thermal debinding of green parts are not necessarily related to the thermal debinding process itself, but may originate from previous processes such as mixing and granulation, injection molding, or solvent debinding, and are amplified and made visible during the thermal debinding process. During thermal debinding heating, the temperature should be controlled to ensure a slow temperatur··· More