Patent ID: 8182739
Filing Date: 2012-05-22
Classification: A61C,A61F,A61L,B22F,B30B,C04B,C22C

Abstract:
1. A process for producing a concentric-circular-gradient functional material for biogenic use, comprising: standing a first cylindrical partition on a supporting stand at a central portion thereof; filling a Ti powder (A) for a central portion into the first cylindrical partition; standing, outside the first cylindrical partition, a second cylindrical partition having a larger diameter than that of the first cylindrical partition concentrically on the supporting stand; filling a first mixed powder comprising the Ti powder (A) for a central portion and a biogenic material powder (B) for a surface layer portion into a space confined by the outside of the first cylindrical partition and the inside of the second cylindrical partition; standing, outside the second cylindrical partition, a third cylindrical partition having a larger diameter than that of the second cylindrical partition concentrically on the supporting stand; filling a second mixed powder which is smaller in the blended amount of the Ti powder (A) for a central portion than the first mixed powder into a space confined by the outside of the second cylindrical partition and the inside of the third cylindrical partition; standing, outside the third cylindrical partition, a fourth cylindrical partition having a larger diameter than that of the third cylindrical partition concentrically; filling a third mixed powder which is smaller in the blended amount of the Ti powder (A) for a central portion than the second mixed powder into a space confined by the outside of the third cylindrical partition and the inside of the fourth cylindrical partition; standing, outside the fourth cylindrical partition or an outermost cylindrical partition if additional cylindrical partitions are used, a cylindrical dice having a larger diameter than that of the fourth cylindrical partition or the outermost cylindrical partition concentrically on the supporting stand; filling the biogenic material powder (B) for a surface layer portion into a space confined by the outside of the fourth cylindrical partition or the outermost cylindrical partition and the inside of the cylindrical dice; pulling out all of the first to fourth cylindrical partitions; capping the upper of the cylindrical dice using a cylindrical punch; turning the dice and the supporting stand upside down; removing the supporting stand; capping the upper of the dice using a punch; and sintering the powders with which the inside of the dice and the punches are filled using a discharge plasma sintering machine, wherein the supporting stand has, on the upper side thereof, a plurality of cylindrical projections configured to permit the respective cylindrical partitions to stand therein.