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Date: 10/02/03 at 11:41 AM
Posted by: Mitch Gross
E-mail: mgross@flomet.com

In Reply to: Powder Oxidation in Water Debinding posted by H. Jorge on 10/02/03 at 11:12 AM:

The surface of iron and ferrous alloy powder particles oxidize prior to sintering of the MIM part. Oxidation occurs during powder handling, feedstock mixing, injection molding, and debinding. However, during sintering the particles are subjected to a reducing atmosphere. This can be done by two methods. One, introducing a reducing gas, such as hydrogen, that will react with the oxygen to form water. Two, introduction of a powder into the feedstock during mixing that will react with the oxygen to from a gas. Carbon black will react with oxygen to form CO. Since the oxygen is very reactive with hydrogen and carbon, the oxygen on the partice surface is rapdily removed during sintering. Therefore, oxidation of iron and ferrous powders is not an issue.

Follow Ups:

  Re: Powder Oxidation in Water Debinding H. Jorge   Posted at: 10/02/03 (1)

  Re: Powder Oxidation in Water Debinding Mitch Gross   Posted at: 10/13/03 (0)

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