Full
Outline
To address the issue of seal failure in drilling pump piston‑cylinder liner sealing pairs caused by excessive friction resistance and severe temperature rise under high‑speed and high‑pressure operating conditions，surface microstructure specimens with varying diameters，depths，area ratios，and arrangements were designed and fabricated using nitrile rubber （NBR） pistons and high‑chromium cast iron cylinder liners.A sealing pair simulation test platform was established using a friction and wear tester to systematically investigate the influence of microstructure geometric parameters on the friction coefficient，surface temperature rise，and wear amount of the sealing pair.The friction reduction and temperature reduction mechanisms were revealed by analyzing the microscopic wear morphology.The results indicate that when the microstructure parameters are a diameter of 100 μm，a depth of 40 μm，and an area ratio of 4% to 5%，the comprehensive performance of the sealing pair is optimal.Compared with the non‑textured specimen，the average friction coefficient is reduced by approximately 50%，the surface temperature rise is reduced by 62.5%，and the piston wear amount is reduced by 40.7%.Under these parameters，the microstructure can achieve continuous lubrication and wear debris storage by forming a "micro‑oil reservoir"，thereby reducing abrasive wear，dispersing contact stress，and avoiding local overheating，synergistically enhancing the friction reduction，temperature reduction，and wear resistance performance of the sealing pair.This study can provide a reference for the surface structure optimization of drilling pump piston‑cylinder liner sealing pairs.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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