Wear resistant extruder screw
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United States of America Patent
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Oct 21, 2003
Grant Date -
Sep 19, 2002
app pub date -
Jan 10, 2001
filing date -
Jan 10, 2001
priority date (Note) -
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Abstract
Wear resistant extruder screws and methods for their manufacture are provided. The extruder screws include a base alloy screw body having a plurality of flights, a major outer diameter and a minor inner diameter. Each of the flights includes a pair of flight sides disposed between the major outer diameter and the minor inner diameter. The flight sides and minor inner diameter define a root area proximate to their juncture. The preferred extruder screws of this invention include a bond coating layer having a thickness of about 1-10 mils disposed over a major portion of the extruder screw which includes the root area, and a wear resistant coating layer having a thickness of about 10-100 mils disposed over said bond coating layer. The wear resistant coating layer preferably has an ASTM G65 dry abrasion wear rating of less than 10 mm.sup.3 /kilometer, or, in further embodiments, the bond coating layer has a coefficient of thermal expansion which is in between that of the wear resistant coating layer and the base alloy.
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