Method for producing highly porous metallic moulded bodies...

B - Operations – Transporting – 22 – F

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

B22F 3/11 (2006.01)

Patent

CA 2488364

The invention relates to a method for producing highly porous, metallic moulded bodies. The inventive method consists of the following steps: a metallic powder used as a starting material is mixed with a dummy; a green body is pressed out of the mixture; the green body is subjected to conventional mechanical machining, the dummy advantageously increasing the stability of the green body; the dummy material is thermally separated from the green body by means of air, a vacuum or an inert gas; and the green body is sintered to form the moulded body and is then advantageously finished. Suitable materials for the dummy are, for example, ammonium bicarbonate or carbamide. The mechanical machining carried out before the sintering advantageously enables a simple production close to the desired final contours, even for complicated geometries of the moulded body to be produced, without impairing the porosity, and without high wear of the tools. The workpiece is advantageously sufficiently stable in terms of pressure for the green machining as the dummy material is still present in the pores of the green body during the machining.

L'invention concerne un procédé de production de corps moulés métalliques très poreux, comprenant les étapes suivantes : une poudre métallique, utilisée comme produit de départ, est mélangée à un substitut ; une ébauche crue est formée par compression à partir de ce mélange ; cette ébauche crue est soumise à un usinage mécanique classique, ledit substitut augmentant de façon avantageuse la stabilité de cette ébauche ; la matière de substitution est séparée thermiquement de cette ébauche crue à l'air, sous vide ou sous gaz protecteur ; ladite ébauche crue est frittée de manière à former le corps moulé puis polie de façon avantageuse. Parmi les matières de substitution appropriées figurent, par exemple, le bicarbonate d'ammonium ou encore la carbamide. L'usinage mécanique avant le frittage permet une production simple, proche du contour final souhaité, même lorsque le corps moulé à produire présente des géométries complexes, sans altération de la porosité ni usure importante de l'outil. L'avantage est que le demi-produit à usiner est suffisamment stable à la pression pour l'usinage en vert, puisque la matière de substitution est encore présente dans les pores de l'ébauche crue au cours de l'usinage.

LandOfFree

Say what you really think

Search LandOfFree.com for Canadian inventors and patents. Rate them and share your experience with other people.

Rating

Method for producing highly porous metallic moulded bodies... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for producing highly porous metallic moulded bodies..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for producing highly porous metallic moulded bodies... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-1427220

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.