Tungsten alloy, tungsten alloy part, discharge lamp, transmitting tube, and magnetron

1. A tungsten alloy comprising a W component and a Hf component comprising HfC, wherein a content of the Hf component in terms of HfC is 0.1 wt % or more and 3 wt % or less, the Hf component comprises metal Hf existing on a surface of the Hf component, and the tungsten alloy has a Vickers hardness of Hv 330 or more.

2. The tungsten alloy according to claim 1 , wherein the Hf component further comprises at least one kind selected from the group consisting of Hf and C.

3. The tungsten alloy according to claim 2 , wherein when a total amount of Hf, HfC, and C is represented by HfC x , where x<1.

4. The tungsten alloy according to claim 2 , wherein when a total amount of Hf, HfC, and C is represented by HfC x , where 0<x<1.

5. The tungsten alloy according to claim 2 , wherein when a total amount of Hf, HfC, and C is represented by HfC x , where 0.2<x<0.7.

6. The tungsten alloy according to claim 1 , wherein the tungsten alloy comprises 0.01 wt % or less of at least one element selected from the group consisting of K, Si, and Al.

7. The tungsten alloy according to claim 1 , wherein when a content of Hf is defined as 100 parts by mass, a content of Zr is 10 parts by mass or less.

8. The tungsten alloy according to claim 1 , wherein the Hf component comprises metal Hf solid-solved in W.

9. The tungsten alloy according to claim 1 , wherein when a content of Hf is defined as 100 parts by mass, a ratio of Hf in HfC is 25 to 75 parts by mass.

10. The tungsten alloy according to claim 1 , wherein the W component comprises tungsten particles having an average crystal particle diameter of 1 μm or more and 100 μm or less.

11. A tungsten alloy part comprising the tungsten alloy according to claim 1 .

12. A tungsten alloy part comprising the tungsten alloy according to claim 1 , wherein the tungsten alloy part is a wire rod having a wire diameter of 0.1 mm or more and 30 mm or less.

13. The tungsten alloy part according to claim 12 , wherein a crystallized structure of a transverse section of the wire rod has an area ratio of tungsten crystals of 90% or more, the tungsten crystals having a crystal particle diameter of 1 μm or more and 80 μm or less per unit area of 300 μm×300 μm.

14. The tungsten alloy part according to claim 12 , wherein a crystallized structure of a vertical section of the wire rod has an area ratio of tungsten crystals of 90% or more, the tungsten crystals having a crystal particle diameter of 2 μm or more and 120 μm or less per unit area of 300 μm×300 μm.

15. The tungsten alloy part according to claim 11 , wherein the tungsten alloy part is used for at least one part selected from the group consisting of a discharge lamp part, a transmitting tube part, and a magnetron part.

16. A discharge lamp comprising the tungsten alloy part according to claim 15 .

17. A transmitting tube comprising the tungsten alloy part according to claim 15 .

18. A magnetron comprising the tungsten alloy part according to claim 15 .

19. The tungsten alloy according to claim 1 , wherein the Vickers hardness is in the range of from Hv 330 to Hv 700.

20. A tungsten alloy comprising a W component and a Hf component comprising HfC particles, wherein a content of the Hf component in terms of HfC is 0.1 wt % or more and 5 wt % or less, an average primary particle diameter of the HfC particles is 15 μm or less, a maximum value of secondary particle diameter of the HfC particles is 100 μm or less, and the tungsten alloy has a Vickers hardness of Hv 330 or more.

21. The tungsten alloy according to claim 20 , wherein the HfC particles have an average primary particle diameter of 5 μm or less, and a maximum primary particle diameter of 15 μm or less.

22. The tungsten alloy according to claim 20 , wherein the Vickers hardness is in the range of from Hv 330 to Hv 700.

23. A tungsten alloy part comprising the tungsten alloy according to claim 20 .