Show Powdered Metal making its bow into industry TNT is not the only kind of powder that is useful in the campaign for the defense of democracy there is no now v another that is achieving victories victories in the preparedness effort and will accomplish even greater ones in the peace time to come it is powdered metal which is coming rapidly into extensive use in in industry as a material out 0 of which metal objects can be b e pressed in finished form and in complex shapes saving a vast amount of machining operations apart from its industrial importance scientists are revealing strange new activities of atoms when metals are reduced to extremely fine powders one of the feats of the atoms atom sin in tying powdered particles together is known as the zipper action in which free surface atomic forces in each of two adjoining metal particles reach out and establish contact across a small gap in space and lock themselves together with the tremendous powers that are inherent in atoms at close range in doing so they pull adjoining atoms on either side into similar close contact so that the atomic 11 powers can become effective and they too become locked this causes other nearby atoms to lock in a progressive chain reaction like a closing zipper powdered metal technique differs from ardi ordinary nary metalworking metal working processes |