聚二乙基硅氧烷 (PDES) 在 Si3N4 和 M50 系统中的摩擦学特性(-80 至 25 °C)--低温条件下的摩擦学特性

Junhao Han, Yong Tang, Luo Yue, Xianzhen Ma, Hao Jia, Ningxia Liu, Pengpeng Bai, Yonggang Meng, Yu Tian
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引用次数: 0

摘要

润滑油必须在低温条件下表现出良好的摩擦学性能,以确保在极寒地区可靠启动。本研究调查了润滑油的性能,重点关注其高温润滑和确保发动机可靠低温启动的能力。实验评估了聚二乙基硅氧烷与 Si3N4 球和 M50 (8Cr4Mo4V) 钢在 -80 °C 至 25 °C 温度范围内的摩擦和磨损特性。结果表明,在不同温度下通过摩擦和磨损测试确定的摩擦系数一直低于 0.1。随着温度逐渐降低,系统的摩擦系数增大,在 25 °C 和 -60 °C 时记录的磨损量分别为 9749.513 µm³ 和 105.006 µm³,最终在 -100 °C 时润滑失效。润滑失效的主要原因是聚二乙基硅氧烷在极低温度下粘度增加,流动性降低。此外,温度降低会增加淬火钢的强度,导致材料表面出现硬质颗粒或突起,在摩擦过程中与 Si3N4 球碰撞,造成粘附和剥落。尽管如此,聚二乙基硅氧烷仍能在表面形成一层稳定的保护油膜,提高系统的润滑性能。然而,当温度低于 -80 °C 时,油膜会开始撕裂,导致润滑效果降低。这项研究为低温润滑领域提供了宝贵的数据支持。
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Tribological Behavior of Polydiethylsiloxane (PDES) in a Si3N4 and M50 System under Low Temperatures from −80 to 25 °C
Lubricants must exhibit good tribological behavior at low temperatures to ensure reliable startups in very cold regions. This study investigates the performance of lubricants, with a specific focus on their capacity for high-temperature lubrication and ensuring reliable low-temperature startup in engines. Experiments were conducted to assess the friction and wear characteristics of polydiethylsiloxane in conjunction with a Si3N4 ball and M50 (8Cr4Mo4V) steel across a temperature range of −80 °C to 25 °C. The results indicate that the coefficient of friction, as determined through friction and wear tests at various temperatures, remained below 0.1. As temperatures progressively decreased, the system’s friction coefficient increased, and wear volumes recorded at 25 °C and −60 °C were 9749.513 µm³ and 105.006 µm³, respectively, culminating in lubrication failure at −100 °C. This failure is primarily attributed to the increased viscosity and decreased mobility of polydiethylsiloxane at extremely low temperatures. Additionally, the reduced temperature increases the strength of the quenched steel, leading to hard particles or protrusions on the material’s surface, which collide with the Si3N4 ball during friction, causing adhesion and spalling. Despite this, polydiethylsiloxane forms a stable protective oil film on the surface, enhancing the system’s lubrication performance. However, below −80 °C, this oil film begins to tear, leading to diminished lubrication efficacy. This study provides valuable data supporting the field of cryogenic lubrication.
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