Abrasion resistant material, puffer cylinder, and puffer type gas circuit breaker

1. An abrasion resistant material comprising:

a base material which is formed of pure aluminum or aluminum alloy and has an unevenness structure formed on its surface; and

an aluminum hydrated oxide film which is formed on the surface of the base material,

wherein a surface of the aluminum hydrated oxide film is provided with an unevenness structure which is finer than the unevenness structure of the base material.

2. The abrasion resistant material according to claim 1 ,

wherein a film formed of a material having a Rockwell hardness of 70 to 110 at the M scale or 10 to 130 at the R scale is formed on the surface of the aluminum hydrated oxide film.

3. The abrasion resistant material according to claim 2 ,

wherein the film is at least one selected from a group including polytetrafluoroethylene, polyetheretherketone, polyacetal, and polyamide.

4. The abrasion resistant material according to claim 3 ,

wherein the aluminum hydrated oxide film is formed by a chemical conversion treatment on the base material.

5. The abrasion resistant material according to claim 4 ,

wherein an arithmetic average roughness Ra of the surface of the base material is larger than an arithmetic average roughness Ra of the surface of the aluminum hydrated oxide film.

6. The abrasion resistant material according to claim 5 ,

wherein the arithmetic average roughness Ra of the surface of the base material is 0.5 to 2 μm.

7. The abrasion resistant material according to claim 1 ,

wherein the aluminum hydrated oxide film is formed by a chemical conversion treatment on the base material.

8. The abrasion resistant material according to claim 1 ,

wherein an arithmetic average roughness Ra of the surface of the base material is larger than an arithmetic average roughness Ra of the surface of the aluminum hydrated oxide film.

9. The abrasion resistant material according to claim 1 ,

wherein the arithmetic average roughness Ra of the surface of the base material is 0.5 to 2 μm.

10. A puffer cylinder which is formed as a hollow cylindrical member by pure aluminum or aluminum alloy,

wherein a piston is fitted into the member and the piston moves in a reciprocating manner while sliding on an inner wall surface of the member,

wherein a surface of the inner wall surface is provided with an unevenness structure in at least a part sliding on the piston,

wherein a surface of the unevenness structure is provided with an aluminum hydrated oxide film, and

wherein a surface of the aluminum hydrated oxide film is provided with an unevenness structure which is finer than the unevenness structure of the inner wall surface.

11. The puffer cylinder according to claim 10 ,

wherein a wear ring is provided between the inner wall surface and the piston, and

wherein the inner wall surface and the piston slide on each other through the wear ring.

12. The puffer cylinder according to claim 11 ,

wherein an entire surface of the inner wall surface is provided with an unevenness structure,

wherein a surface of the unevenness structure is provided with an aluminum hydrated oxide film, and

wherein the surface of the aluminum hydrated oxide film is provided with an unevenness structure which is finer than the unevenness structure of the inner wall surface.

13. The puffer cylinder according to claim 12 ,

wherein the surface of the aluminum hydrated oxide film is provided with a film which is formed of a same material as that of the piston or the wear ring.

14. The puffer cylinder according to claim 13 ,

wherein the aluminum hydrated oxide film is formed by a chemical conversion treatment on the member.

15. The puffer cylinder according to claim 14 ,

wherein an arithmetic average roughness Ra of the surface of the member is larger than an arithmetic average roughness Ra of the surface of the aluminum hydrated oxide film.

16. The puffer cylinder according to claim 15 ,

wherein the arithmetic average roughness Ra of the surface of the base material is 0.5 to 2 μm.

17. A puffer type gas circuit breaker comprising:

a container which is filled with an arc extinguishing gas;

a fixed contact; a movable contact; a puffer cylinder; and a piston which are provided inside the container,

wherein the movable contact is connected to the fixed contact to be movable close thereto and away therefrom,

wherein the puffer cylinder is connected to the movable contact,

wherein the piston is provided inside the puffer cylinder and is adapted to move while sliding on an inner wall surface of the puffer cylinder and to suck and eject an arc extinguishing gas so that an arc generated in an opening between the fixed contact and the movable contact disappears by the gas blowing to the arc, and

wherein the puffer cylinder is the puffer cylinder according to claim 16 .

18. The puffer cylinder according to claim 10 ,

wherein an entire surface of the inner wall surface is provided with an unevenness structure,

wherein a surface of the unevenness structure is provided with an aluminum hydrated oxide film, and

wherein the surface of the aluminum hydrated oxide film is provided with an unevenness structure which is finer than the unevenness structure of the inner wall surface.

19. The puffer cylinder according to claim 10 ,

wherein the surface of the aluminum hydrated oxide film is provided with a film which is formed of a same material as that of the piston or the wear ring.

20. The puffer cylinder according to claim 10 ,

wherein the aluminum hydrated oxide film is formed by a chemical conversion treatment on the member.