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Design Recommendations

Certain design principles should be followed:

• Considering the flow characteristics of the powders in the die, the pressure and temperature conditions under which the powder is injected in the mold should be selected to assure die filling.

• The shape of the part must permit ejection from the die.

• Special care should be taken when removing the binder. Heating rates, temperatures, and debinding times should be carefully controlled and correlated with part thickness. A relatively new water-soluble methyl-cellulose binder is promising. The water from the binder evaporates early during heating and the methyl-cellulose burns off during sintering.

• Design to take advantage of the fact that certain forms can be produced which are impossible, impractical, or uneconomical to obtain by any other method.

When considering powder metallurgy process, the designer should keep in mind that products converted from other manufacturing processes without modifications in design rarely perform as well as parts designed specifically for manufacture by powder metallurgy.

For additional insight into design parts that are generated in a mold, we refer the reader to plastic injection molding design guide. For a general design guide for ceramic components, click here.