Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Liquid phase sintering
Patent
1997-01-17
1999-09-07
Jenkins, Daniel J.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Liquid phase sintering
419 18, 419 28, 419 38, B22F 312
Patent
active
059500646
ABSTRACT:
There is provided a lead-free projectile, such as a bullet or a ballistic shot, formed by liquid phase sintering or liquid phase bonding of a first particulate having a density greater than lead, a second, ductile, particulate having a melting temperature in excess of 400.degree. C. and a binder having a fluidity temperature that is less than the melting temperature of the second particulate. Unlike solid phase sintering that tends to produce articles having a porosity of about 20%, by volume, liquid phase sintering and liquid phase bonding achieve close to 0% porosity. Reducing the porosity level decreases the amount of high density, first particulate, required to achieve a density close to that of lead. Since the high density particulate tends to be the most expensive component of the projectile, this significantly reduces the cost of the projectile. The reduced porosity also allows for an increase in the amount of the second, ductile, component. Increased ductility generates a projectile with a reduced likelihood of fragmentation on being fired from a weapon and with better deformation on impact with a target. One suitable composition for the projectile is ferrotungten-iron-zinc.
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Mravic Brian
Robinson Peter W.
Tyler Derek E.
Jenkins Daniel J.
Olin Corporation
Rosenblatt Gregory S.
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