镀铬缸套摩擦磨损性能研究

发布时间：2018-02-17 05:25

本文关键词： 镀铬缸套 PVD氮化铬活塞环喷钼活塞环摩擦磨损性能　出处：《大连海事大学》2012年硕士论文　论文类型：学位论文

【摘要】：内燃机性能的不断强化使处于复杂工况的缸套-活塞环摩擦副工作环境更加恶劣,所以对缸套-活塞环摩擦副的耐磨性、抗黏着性等综合性能提出了更高的要求。因此,系统地开展缸套-活塞环的摩擦学性能研究,探索不同工况下的摩擦磨损规律和机制,为缸套-活塞环的应用及摩擦学设计提供理论基础,对于改善内燃机的摩擦学性能有着重要的意义。本文针对镀铬缸套,选择PVD氮化铬活塞环和喷钼活塞环为配副材料,秉承试样试验的磨损形式-条件模拟准则,采用自行研制的对置往复式摩擦磨损试验机,开展载荷级试验、磨损试验、贫油试验,研究载荷、温度对不同缸套-活塞环摩擦系数、磨损量、断油摩擦时间的影响规律,通过分析试验后缸套、活塞环试样表面形貌及其化学成分,研究缸套-活塞环的摩擦磨损机理。结果表明： (1)当温度大于70℃时,镀铬缸套-喷钼活塞环摩擦副的摩擦系数随着温度的升高而下降；镀铬缸套-PVD氮化铬活塞环的摩擦系数先下降后上升。 (2)载荷对摩擦副磨损量的影响比温度更明显。相同载荷、温度、转速条件下配副为PVD氮化铬活塞环的镀铬缸套比配副为喷钼活塞环的镀铬缸套磨损严重,但磨损量甚微。镀铬缸套的磨损机理以剥离形式的疲劳磨损为主。 3)当载荷小于60MPa、温度低于200℃时,镀铬缸套-PVD氮化铬活塞环的抗黏着性能优于镀铬缸套-喷钼活塞环,随着载荷增加、温度升高,两对摩擦副的抗黏着性能均下降。镀铬缸套-PVD氮化铬活塞环异常黏着磨损的主要机制是摩擦副局部高温软化变形；镀铬缸套-喷钼活塞环异常黏着磨损的主要机制是喷铝层材料黏附在镀铬层上造成局部黏着。
[Abstract]:Continue to strengthen the engine performance of the piston in the complex conditions of the cylinder friction ring work environment is more severe, so the friction and wear resistance of the side of cylinder piston ring, the higher requirements of comprehensive performance of anti adhesion is proposed. Therefore, to carry out the system of cylinder piston ring friction resistance of friction, explore the wear law and mechanism under different conditions, and provide a theoretical basis for the application of tribology design of cylinder piston ring, is of great significance for the improvement of tribological properties of internal combustion engine.
This paper chooses PVD chromium nitride chrome liner, piston ring and piston ring for a pair of molybdenum spraying material, wear simulation criteria form - test the adhering conditions, using self-developed opposed reciprocating friction wear testing machine to carry out load test, wear test, oil test, study load, temperature of different cylinder piston ring friction coefficient, wear volume, influence of broken oil friction time, through the analysis of the test after the cylinder liner, piston ring specimen surface and its chemical composition, study on the friction and wear mechanism of cylinder piston ring.
The results show that:
(1) when the temperature is greater than 70 degrees, the friction coefficient of the friction pair of chrome plated cylinder liner and molybdenum spray piston ring decreases with the increase of temperature. The friction coefficient of chrome plated cylinder liner -PVD chromium nitride piston ring first decreases and then rises.
(2) load on the friction and wear effect than temperature is more obvious. The same load, temperature, speed under the condition of a pair of PVD chromium nitride piston ring cylinder side of chrome plated cylinder than chrome sprayed molybdenum piston ring wear, but the wear volume is minimal. The wear mechanism of the cylinder with chrome stripping in the form of fatigue wear.
3) when the load is less than 60MPa, the temperature is lower than 200 DEG C, chrome plated cylinder -PVD chromium nitride piston ring anti adhesion performance is better than that of chrome plated cylinder - sprayed molybdenum piston ring, with the increase of load, temperature, anti adhesion performance of two pairs of friction pair was decreased. The main mechanism of cylinder piston ring -PVD chrome plating chromium nitride abnormal adhesion wear is the local friction softening deformation; the main mechanism of cylinder piston ring chrome molybdenum anomaly is sprayed aluminum layer adhesive wear material adhesion caused by focal adhesion in the chrome layer.

【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH117.1;TK407

【引证文献】