| (11) | EP 4 060 200 A1 |
(12) | EUROPEAN PATENT APPLICATION |
published in accordance with Art. 153(4) EPC |
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(54) | SLIDING COMPONENT |
(57) Provided is a sliding component capable of obtaining a stable low-friction effect under a wide range of conditions of use. A sliding component 20 has a relatively sliding surface 21. A base material 22 of the sliding component 20 is coated with a graphite film 30, and the sliding surface 21 is made of the graphite film 30. |
{TECHNICAL FIELD}
{BACKGROUND ART}
{CITATION LIST}
{Patent Literature}
Patent Citation 1: JP 2011-58517 A (Page 6, FIG. 1)
Patent Citation 2: JP 2004-225725 A (Page 6, FIG. 2)
{SUMMARY OF INVENTION}
{Technical Problem}
{Solution to Problem}
{BRIEF DESCRIPTION OF DRAWINGS}
FIG. 1 is a vertical cross-sectional view illustrating an example of a mechanical seal including sliding components according to an embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view illustrating a sliding surface of a rotating seal ring that is yet to be used and covered with a graphite film in the embodiment.
FIG. 3 is an enlarged cross-sectional view illustrating a state where a shear mass is generated as a result of sliding between the sliding surface of the rotating seal ring where the graphite film is formed and a sliding surface of a stationary seal ring in the embodiment.
FIG. 4 is an enlarged cross-sectional view illustrating a state after the sliding between the sliding surface of the rotating seal ring where the graphite film is formed and the sliding surface of the stationary seal ring in the embodiment.
{DESCRIPTION OF EMBODIMENTS}
{Embodiment}
Load = 10 N
Surface pressure of sliding surface of stationary seal ring = 0.25 MPa
Rotation speed of rotating seal ring = 74 rpm
PV value = 0.008 MPa. m/sec
Test time = up to sliding distance of 1000 m
Sealing target fluid = atmosphere
Sample | Degree of graphitization (area%) | Usability | Transfer film formation |
A | 90 | ○ | Formed |
B | 70 | ○ | Formed |
C | 50 | ○ | Formed |
D | 30 | × | Formed |
E | 10 | × | Not formed |
Load = 10 N
Surface pressure of sliding surface of stationary seal ring = 0.25 MPa
Rotation speed of rotating seal ring = 74 rpm
PV value = 0.008 MPa. m/sec
Test time = up to sliding distance of 1000 m
Sealing target fluid = atmosphere
Sample | Film thickness (µm) | Usability | Peeling | Cracking |
F | 1 | ○ | Absent | Absent |
G | 10 | ○ | Absent | Absent |
H | 20 | ○ | Absent | Absent |
I | 50 | ○ | Absent | Absent |
K | 100 | ○ | Absent | Absent |
L | 0.5 | - | Present | Absent |
M | 120 | - | Absent | Present |
{REFERENCE SIGNS LIST}
REFERENCES CITED IN THE DESCRIPTION
Patent documents cited in the description