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:
Mar. 28, 2000
Filed:
Nov. 20, 1998
David S Lashmore, Lebanon, NH (US);
Materials Innovation, Inc., West Lebanon, NH (US);
Abstract
Steel powder for use in case hardenable steels is provided. The steel powder is made from a plurality of pre-alloyed iron-molybdenum particles. Each of the particles has from about 1.5 to about 3.5 percent by weight of molybdenum and have a diameter of from about 20 to about 200 microns. The powders further have from about 0.001% by weight to about 0.5% by weight of a coating. The coating is made up of from about 40% to about 85% by weight of one or more of FeO, Fe.sub.3 O.sub.4, Fe.sub.2 O.sub.3, (Fe.sub.2 O.sub.3.H.sub.2 O) and combinations thereof; and from about 15% to about 60% by weight of one or more of FePO.sub.4, Fe.sub.3 (PO.sub.4).sub.2, FeHPO.sub.4, Fe.sub.3 (PO.sub.4).sub.2.2H.sub.2 O, Fe.sub.2 (PO.sub.4).sub.3.8H.sub.2 O, FeCrO.sub.4, FeMoO.sub.4, FeC.sub.2 O.sub.4, and FeWO.sub.4. Also provided is a steel powder composition for use in manufacturing sinter hardenable structural parts. The powder is made from a plurality of pre-alloyed steel particles of from about 0.5 to about 3.5 percent by weight of molybdenum, from about 0% to about 0.5% by weight nickel and from about 0% to about 0.6% manganese and from about 0.05 to about 0.08 percent by weight of the mixture of particulates of graphite. The particles have a diameter of from about 20 to about 200 microns and each of the particles has from about 0.5% by weight to about 2% by weight of a coating disposed thereon. The coating is a substantially uniform metallurgical layer of one or more of copper, cobalt, nickel, and chromium. An article made by compressing this steel powder composition has an as pressed 'green' strength of at least about 10 Kpsi as measured in accordance with MPIF 41 (ASTM B312/B528).