Method for the production of precision shapes

Details Method for the production of precision shapes Method for the production of precision shapes

B - Operations, Transporting

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18/1119, 75/160

B22F 7/02 (2006.01) B22F 3/12 (2006.01) B22F 3/15 (2006.01)

Patent

CA 1138170

- 1 - ABSTRACT METHOD FOR THE PRODUCTION OF PRECISION SHAPES A method for producing precision shapes which includes the consolidation of powder metal preforms into a shaped por- ous preform. When formed by powder metallurgy techniques, pre- cision shapes have highly desirable characteristics from the standpoint of grain structure, and the production of preforms in accordance with the invention enhances the achievement of such shapes. In practicing the method, a first coating 16 is applied to the preform 14, this first coating being porous while providing a diffusion barrier. A second coating 18 which is also initially porous is then applied and the coated preform can then be degasified by subjecting the preform to a vacuum, particularly at elevated temperatures. The coated pre- form is then heated under vacuum to a temperature such that the second coating is densified to the extent that it becomes non- porous. Finally, the preform is subjected to a hot isostatic pressing operation whereby formation of a high integrity, ful- ly dense metal shape results.

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