| 摘要: |
| 将平均粒径为20~50 nm的铜粉均匀分散到柴油中，在12PSDB75型喷油泵试验台上利用纳米铜微粒的磨损自修复性能，在不拆卸零件的情况下对磨损失效的喷油泵柱塞偶件进行了原位修复，利用扫描电镜（SEM）、能谱仪（EDS）等对修复前后柱塞表面进行了形貌与微区成分分析。结果表明，在试验台转速500 r/min的条件下修复后的喷油量较修复前提高了33.3 %。这主要是因为在喷油泵运转过程中，添加到柴油中的纳米铜颗粒能在柱塞及柱塞套内表面形成一定厚度的铜保护膜，从而减小偶件的配合间隙，增大喷油压力与喷油量，改善喷油泵性能。 |
| 关键词: 纳米铜颗粒 自修复 铜保护膜 原位修复 喷油泵柱塞偶件 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(50235030)和武器装备预研基金项目(编号略) |
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| In-situ Repair of Injection Pump Plunger by Applying Cu Auto-reconditioning Nanophase Materials |
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YU He-long，XU Yi，SHI Pei-jing，ZHANG Wei，XU Bin-shi
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National Key Laboratory for Remanufacturing, Academy of Armored Force Engineering, Beijing 100072, China
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| Abstract: |
| In the present work, Cu nanoparticles with an average size of 20-50 nm were dispersed in diesel fuel oil. A injection pump plunger was in-situ repaired on a 12PSDB75 fuel injection pump by applying auto-reconditioning function of Cu nanoparticles. Mophologies and typicle element distributions of the plunger piston surface before and after repair were analyzed by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). Results indicate that by adding Cu nanoparticles to diesel fuel, a thin copper film is formed on injection pump plunger and barrel surface during friction process. Hence, the fit clearance between injection pump plunger and pump barrel is reduced. As a result of that effect, the oil injection pressure is enlarged and oil injection volume increases 33.3% than before at a rotational speed of 500 rpm. |
| Key words: Cu nanoparticles auto-recondition Cu protective film in-situ repair injection pump plunger and barrel |
