Abstract: A concentric-circular-gradient functional material for biogenic use is produced using first, second, third and forth cylindrical partitions, and a cylindrical dice which are concentrically stood on a supporting stand. Ti powder (A) fills the first cylindrical partition. A first mixed powder including Ti powder (A) and biogenic material powder (B) fills between the first and second cylindrical partitions. A second mixed powder including a smaller amount of Ti powder (A) than the first mixed powder fills between the second and third cylindrical partitions. A third mixed powder including a smaller amount of Ti powder (A) than the second mixed powder fills between the third and fourth cylindrical partitions. The biogenic material powder (B) fills between the fourth cylindrical partition and the dice. The first to fourth partitions are pulled out. The dice is capped using a punch. The powders are sintered using a discharge plasma sintering machine.

Abstract: A layered gradient material which comprises a plurality of layers composed of a mixture of hydroxyapatite and calcium tertiary phosphate and is obtained by producing a layered body by stacking a plurality of layers in which the compounding ratio of hydroxyapatite to calcium tertiary phosphate is stepwise or continuously changed and then sintering the layered body by the spark plasma sintering method is excellent in mechanical strength such as compressive strength, flexural strength and Young's modulus, and further, is excellent in biological reactivity such that in the case where it is used as a bone substitute material, bone destruction and new bone reconstruction actively occur. Accordingly, it is extremely useful as a biological material such as a bone substitute material, artificial tooth root and dental cement.

Abstract: A concentric-circular-gradient functional material for biogenic use is produced using first, second, third and forth cylindrical partitions, and a cylindrical dice which are concentrically stood on a supporting stand. Ti powder (A) fills the first cylindrical partition. A first mixed powder including Ti powder (A) and biogenic material powder (B) fills between the first and second cylindrical partitions. A second mixed powder including a smaller amount of Ti powder (A) than the first mixed powder fills between the second and third cylindrical partitions. A third mixed powder including a smaller amount of Ti powder (A) than the second mixed powder fills between the third and fourth cylindrical partitions. The biogenic material powder (B) fills between the fourth cylindrical partition and the dice. The first to fourth partitions are pulled out. The dice is capped using a punch. The powders are sintered using a discharge plasma sintering machine.