Method for producing aperture-containing powder-metallurgy article
Patent 3992202 Issued on November 16, 1976. Estimated Expiration Date: 
November 16, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 16, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3007744 3168399 3313621 3531848 3571850 3599281 3738830 3803702 3844778 InventorsApplicationNo. 514042 filed on 10/11/1974US Classes:419/5, Making composite or hollow article419/49Hot isostatic pressing (HIP)ExaminersPrimary: Schafer, Richard E.AbstractMethod for producing a powder-metallurgy article having at least one aperture therein; the article is produced by providing a dense, nondeformable core having a configuration corresponding to the desired configuration of the aperture in said article; the core is placed in a particle charge having a composition corresponding to that desired in the article; the position of the core within the particle charge corresponds to the desired position of the aperture within the final compacted product. The core has a coefficient of thermal expansion greater than that of said article, whereby after compacting removal of the core from the article to create the aperture is facilitated. A separating medium may be used between the core and the powder. The asembly constituting the container, core and powder is hot isostatically compacted, and upon cooling the container and core are removed from the densified article. | |
