The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 10, 1999
Filed:
Jan. 29, 1997
Damodaran Raghu, Elkhart, IN (US);
Martin E Lohrman, Goshen, IN (US);
Deloro Stellite Company, Inc, St, Louis, MO (US);
Abstract
A nickel based hardfacing alloy having the following elemental constituents, by weight: Cr, 16-22%; Mo, 1-7%; Si, 2.5-3.7%; C, 0.8-1.4%; B, 2-3%; Fe, 2-3.9%; Co, 4.3-17%; Ni and incidental impurities, balance. The alloy is in gas-atomized powder form suitable for deposition by plasma transferred arc welding, has a hardness in the range of about 50 Rc to 60 Rc, a coefficient of friction in the range of about 0.12 to 0.13, an ASTM G-65 wear rating in the range of about 20 to 26, and an ASTM G-77 wear rating in the range of about 0.0 to 0.074. A method of enhancing the abrasive wear resistance and metal-to-metal wear resistance of a substrate by welding a Ni based alloy having at least 40% Ni by weight, between 4% and 18% Co by weight, and between 2% and 3% B, onto wear surfaces of the substrate as a coating having a thickness between about 0.025 in. and about 0.5 in. A plastic extruder screw comprising a metallic body having screw flights and a coating on the screw flights, which coating is between about 0.025 in. and 0.5 in. thick, and is a Ni based alloy having between 4% and 18% Co by weight and between 2% and 3% B by weight.