Cermet powder
A cermet powder includes a) from 50 to 90 wt-% of at least one hard material, and b) from 10 to 50 wt-% of a matrix metal composition. The wt.-% for a) and b) are based on a total weight of the cermet powder. The matrix metal composition comprises i) from 40 to 75 wt-% of iron and nickel, ii) from 18 to 35 wt-% of chromium, iii) from 3 to 20 wt.-% of molybdenum, and iv) from 0.5 to 4 wt-% of copper. The wt-% for i) to iv) are based in each case on a total weight of the matrix metal composition. A weight ratio of iron to nickel is from 3:1 to 1:3.
1. A sintered cermet powder comprising:
a) from 50 to 90 wt-% of at least one hard material; and
b) from 10 to 50 wt-% of a matrix metal composition, the wt.-% for a) and b) being based on a total weight of the cermet powder, the matrix metal composition comprising:
i) from 40 to 75 wt-% of iron and nickel,
ii) from 18 to 35 wt-% of chromium,
iii) from 3 to 20 wt.-% of molybdenum, and
iv) from 0.5 to 4 wt-% of copper,
the wt-% for i) to iv) being based in each case on a total weight of the matrix metal composition, and a weight ratio of iron to nickel being from 3:1 to 1:3,
wherein the sintered cermet powder is produced by a process comprising the steps of:
mixing or milling the at least one hard material powder with the matrix metal composition which is provided as a powder so as to obtain a powder mixture, and
sintering the powder mixture so as to obtain the sintered cermet powder mixture.
2. The sintered cermet powder as recited in claim 1 , wherein the matrix metal composition further comprises v) cobalt.
3. The sintered cermet powder as recited in claim 2 , wherein the cobalt is present in an amount of up to 10 wt-% based on the total weight of the matrix metal composition.
4. The sintered cermet powder as recited in claim 1 , wherein the matrix metal composition further comprises vi) a modifier.
5. The sintered cermet powder as recited in claim 4 , wherein the modifier is selected from Al, Nb, Ti, Ta, V, Si, W and mixtures thereof.
6. The sintered cermet powder as recited in claim 4 , wherein the modifier is present in an amount of up to 5 wt-% based on the total weight of the matrix metal composition.
7. The sintered cermet powder as recited in claim 1 , wherein the matrix metal composition consists essentially of:
i) from 40 to 75 wt-% of iron and nickel;
ii) from 18 to 35 wt-% of chromium;
iii) from 3 to 20 wt-% of molybdenum;
iv) from 0.5 to 4 wt-% of copper;
v) from 0.0 to 10 wt-% of cobalt; and
vi) from 0.0 to 5 wt-% of at least one modifier;
the wt-% for i) to vi) being based in each case on the total weight of the matrix metal composition, and the weight ratio of iron to nickel being from 3:1 to 1:3.
8. The sintered cermet powder as recited in claim 1 , wherein the matrix metal composition comprises from 15 to 50 wt-% of iron.
9. The sintered cermet powder as recited in claim 1 , wherein the matrix metal composition comprises from 15 to 50 wt-% of nickel.
10. The sintered cermet powder as recited in claim 1 , wherein the matrix metal composition comprises from 20 to 33 wt-% of chromium.
11. The sintered cermet powder as recited in claim 1 , wherein the matrix metal composition comprises from 4 to 15 wt-% of molybdenum.
12. The sintered cermet powder as recited in claim 1 , wherein the matrix metal composition comprises from 0.7 to 3 wt-% of copper.
13. The sintered cermet powder as recited in claim 1 , wherein the weight ratio of iron to nickel in the matrix metal composition is from 1:2 to 2:1.
14. The sinteed cermet powder as recited in claim 1 , wherein the at least one hard material is a metal carbide.
15. The sintered cermet powder as recited in claim 14 , wherein the metal carbide is selected from WC, Cr 3 C 2 , VC, TiC, B 4 C, TiCN, SiC, TaC, NbC, Mo 2 C and mixtures thereof.
16. The sintered cermet powder as recited in claim 1 , wherein the cermet powder comprises an average particle size of from 10 to 100 μm as determined in accordance with ASTM C1070.