Gear, deceleration device, robot, and moving object
A gear includes a sintered body, in which Fe is contained as a principal component, Ni is contained in a proportion of 2 mass % or more and 20 mass % or less, Si is contained in a proportion of 0.3 mass % or more and 5.0 mass % or less, C is contained in a proportion of 0.005 mass % or more and 0.3 mass % or less, and one element selected from the group consisting of Ti, V, Y, Zr, Nb, Hf, and Ta is defined as a first element, that is contained in a proportion of 0.01 mass % or more and 0.7 mass % or less.
1. A gear, comprising a sintered body having a composition consisting of:
Fe is contained as a principal component,
Ni is contained in a proportion of 2 to 20 mass %,
Si is contained in a proportion of 0.3 to 5.0 mass %,
C is contained in a proportion of 0.005 to 0.3 mass %,
Hf is contained in a proportion of 0.01 to 0.7 mass %;
Nb in a proportion of 0.01 to 0.7 mass %; and
Zr in a proportion of up to 0.7 mass %.
2. The gear according to claim 1 , wherein when a ratio X1/X2 of a value X1 which is obtained by dividing a content E1 of either Hf or Zr by the mass number of either Hf or Zr to a value X2 which is obtained by dividing a content E2 of Nb by the mass number of Nb is 0.3 to 3.
3. The gear according to claim 1 , wherein the sum of the content of either Hf or Zr and the content of Nb is 0.05 to 0.8 mass %.
4. A deceleration device, comprising the gear according to claim 1 .
5. A deceleration device, comprising the gear according to claim 2 .
6. A deceleration device, comprising the gear according to claim 3 .
7. A robot, comprising a power transmission section including the gear according to claim 1 .
8. A robot, comprising a power transmission section including the gear according to claim 2 .
9. A robot, comprising a power transmission section including the gear according to claim 3 .
10. A moving object, comprising a power transmission section including the gear according to claim 1 .
11. A moving object, comprising a power transmission section including the gear according to claim 2 .
12. A moving object, comprising a power transmission section including the gear according to claim 3 .