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What are the Principles behind the Debinding Process? How does the Debinding Process occur? How long does it take?

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Date：2025-08-05 Views：1004

The principle of debinding is to remove the binder from the green part, turning it into a brown part for subsequent sintering operations. Debinding is the most time-consuming step in the MIM process.

Three Debinding Methods:

1. Thermal debinding (vacuum debinding) (widely used): Parts formed by injection molding are slowly heated to evaporate and decompose the polymeric binder.

2. Solvent debinding: The part is immersed in a solvent to dissolve part of the binder, leaving the insoluble polymer matrix to hold the powder particles in place for subsequent operations.

3. Nitric acid debinding: A catalytic material is used to erode the polyformaldehyde binder.

Time Required for Different Debinding Methods:

Debinding Methods		Time required
Thermal Debinding	Thin-walled parts (<5 mm)	7-10 days
Thermal Debinding	Thick-walled parts (>10mm)	Up to several weeks
Solvent Debinding	Organic solvent debinding	5-24 hours
Solvent Debinding	Water debinding	3-12 hours
Nitric Acid Debinding	Typical cases	1-10 hours
Nitric Acid Debinding	Thick-walled parts	Less than 10 hours

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