Saint-gobain Industrial Ceramics, Inc.

Arthur A Hendrick

Steven H Bowens

Anthony L Owoc

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 /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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Greensburg, PA, United States of America

Arthur A Hendrick