Date：2025-07-31 Views：0
Yes, MIM also exhibits defects similar to those found in plastics, such as shrinkage marks, sink marks, and weld lines, as their production principles are similar. However, due to the inherent differences between metal and plastic properties, their defects also differ, and the strategies for addressing them are distinct from those for plastics.
Metal powders result in poor flowability, rapid heat conduction, and significant sintering shrinkage, making defects more prone to occur and harder to control, with green parts being more fragile.
Requires larger draft angles
Requires higher precision surface inspections
Strict requirements for sintering
Defect Type | Main Causes in Plastic Injection Molding | Main Causes in MIM | MIM-Specific Solutions |
Weld Lines | Low material flow temperature, small convergence angle | Powder segregation + rapid cooling | Optimize powder loading quantity, mold temperature >150°C |
Shrinkage marks | Uneven wall thickness + insufficient holding pressure | Sintering shrinkage amplifies density unevenness | Balance the runner + improve green compact density uniformity |
Dents | Trapped gas or cooling defects | Low-density areas in the green compact + gas expansion during sintering | Enhanced venting + homogenization of raw materials |
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