Ti-based cermet

1. A Ti containing cermet comprising:

Co and Ni,

at least one of a carbide, a nitride and a carbonitride of at least one selected from the metal elements of groups 4, 5 and 6 of the periodic table, of which a main component is Ti, and

Ru in a concentration of from 0.1% to 10.0% by mass of cermet.

2. The Ti containing cermet according to claim 1 , wherein the surface is covered by a coating layer comprising

Ti 1-a-b-c-d Al a W b Si c M d (C x N 1-x ), wherein M is at least one selected from the group consisting of Nb, Mo, Ta, Hf and Y; and wherein 0.45≦a≦0.55; 0.01≦b≦0.1; 0.01≦c≦0.05; 0.01≦d≦0.1; 0≦x≦1.

3. A Ti containing cermet comprising:

a first hard phase comprising at least one of TiC, TiN and TiCN;

a second hard phase comprising at least one of a carbide, a nitride and a carbonitride of at least one selected from the metal elements of groups 4, 5 and 6 of the periodic table; and

a binder phase comprising Ru, Co and Ni,

wherein the first and second hard phases are bound together by the binder phase,

wherein Ti is a main component of the cermet; and

wherein a concentration of the Ru is from 0.1% to 10.0% by mass of cermet.

4. The Ti containing cermet according to claim 3 , wherein the second hard phase and the binder phase contain W, and wherein an amount of W in the binder phase is larger than an amount of W in the second hard phase.

5. The Ti containing, cermet according to claim 4 , wherein the second hard phase further comprises Nb, and an amount of Nb in the second hard phase is larger than an amount of Nb in the binder phase.

6. The Ti containing cermet according to claim 4 , wherein a proportion of W content to the total amount of the metal elements of groups 4, 5 and 6 of the periodic table in the second hard phase is in a range from 10 to 20% by mass, and that in the binder phase 3 is in a range from 30 to 70% by mass.

7. The Ti-based cermet according to claim 3 , wherein the surface is covered by a coating layer comprising Ti 1-a-b-c-d Al a W b Si c M d (C x N 1-x ), wherein M is at least one selected from the group consisting of Nb, Mo, Ta, Hf and Y; and wherein 0.45≦a≦0.55; 0.01≦b≦0.1; 0.01≦c≦0.05; 0.01≦d≦0.1; 0≦x≦1.