BIOCOMPATIBLE Co-Cr-Mo ALLOY

Abstract

The present invention is to provide a Co—Cr—Mo alloy excellent in mechanical properties such as yield strength and tensile strength. The present invention is a biocompatible Co—Cr—Mo alloy comprising, in mass %, more than 30% and not more than 36% of Cr, 5 to 8% of Mo, 0.20 to 0.65% of N, and the balance consisting of Co and inevitable impurities, and produced by layered manufacturing. The biocompatible Co—Cr—Mo alloy of the present invention preferably has a solidification structure of a dendrite structure and the primary arm spacing of the dendrite structure is not more than 5 μm.

1 . A biocompatible Co—Cr—Mo alloy comprising, in mass %,
 more than 30% and not more than 36% of Cr, 
 5 to 8% of Mo, 
 0.20 to 0.65% of N, and the balance consisting of Co and inevitable impurities, and produced by layered manufacturing. 
 
     
     
         2 . The biocompatible Co—Cr—Mo alloy according to  claim 1 , wherein a solidification structure is a dendrite structure, and
 the primary arm spacing of the dendrite structure is not more than 5 μm. 
 
     
     
         3 . The biocompatible Co—Cr—Mo alloy according to  claim 1 , wherein the 0.2% proof stress is not less than 700 MPa and the tensile strength is not less than 980 MPa. 
     
     
         4 . A biocompatible Co—Cr—Mo alloy powder used for producing the biocompatible Co—Cr—Mo alloy according to  claim 1 , having a particle diameter of not more than 100 μm. 
     
     
         5 . A process for producing an biocompatible Co—Cr—Mo alloy, wherein the Co—Cr—Mo alloy powder according to  claim 4  is layered-manufactured. 
     
     
         6 . The process for producing an biocompatible Co—Cr—Mo alloy according to  claim 5 , wherein the layered manufacturing is carried out by irradiating laser of an output power of not less than 50 W and adjusting the scan pitch in the plane direction to be not less than 0.1 mm.