| 摘要 |
A new solid free-form fabrication process, the permeation controlled concurrent consolidation ("PCCC") process, is described. In the PCCC process, an article is created by forming a powder bed comprising individually applied powder layers onto which a permeation control agent has been selectively deposited in patterns corresponding to the negatives or outlines of cross-sectional slices of the article. A binding agent is permeated through selected regions of the powder bed that have not been treated with the permeation control agent to globally consolidate the untreated powder into the article. In some embodiments, multiple cycles of applying powder layers, depositing a permeation control agent on these powder layers, and globally consolidating selected portions of the untreated powder in the powder beds formed by these powder layers are performed to construct the article. |
