Ismail Mohd Farid, Azmi Wan Hamzah, Mamat Rizalman, Ali Hafiz Muhammad
Faculty of Mechanical and Manufacturing Engineering Technology, Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, Durian Tunggal 75150, Melaka, Malaysia.
Centre for Research in Advanced Fluid and Processes, Lebuhraya Tun Razak, Gambang, Kuantan 26300, Pahang, Malaysia.
Nanomaterials (Basel). 2022 Dec 22;13(1):42. doi: 10.3390/nano13010042.
The addition of nanoparticles may have a positive or negative impact on the thermal and tribological properties of base lubricant. The objective of this paper is to investigate the effect of nanoparticle dispersion in lubricant base in relation to its application in refrigeration system compressors. An investigation of tribological and thermal properties of nanolubricants for rolling piston rotary systems was carried out through four-ball tribology tests and thermal conductivity measurements. Nanolubricants dispersed with SiO and TiO nanoparticles were tested at various concentrations and temperatures. The changes in thermal conductivity and coefficient of friction (COF) were analyzed while wear weight loss was also calculated from wear scar size. A regression model of thermal conductivity enhancement was proposed for both types of nanoparticles. Zeta potential results show that nanolubricants have excellent stability. The thermal conductivity increases by the increment of nanoparticle concentration but decreases by temperature. The R-square for the regression model is more than 0.9952 with an average deviation not more than 0.29%. The COF for SiO/PVE nanolubricant at 0.003 vol.% reduced 15% from the baseline. The COF for nanolubricants exceeds the result for base lubricants when the concentration is more than the threshold value. The optimum concentration of SiO and TiO nanoparticles improved the thermal and tribological properties of PVE lubricant and may offer an advantage when applied to refrigeration systems.
纳米颗粒的添加可能会对基础润滑剂的热性能和摩擦学性能产生积极或消极的影响。本文的目的是研究纳米颗粒在润滑剂基体中的分散情况对其在制冷系统压缩机中的应用的影响。通过四球摩擦学试验和热导率测量，对滚动活塞旋转系统的纳米润滑剂的摩擦学和热性能进行了研究。对分散有SiO和TiO纳米颗粒的纳米润滑剂在不同浓度和温度下进行了测试。分析了热导率和摩擦系数（COF）的变化，同时还根据磨损斑尺寸计算了磨损失重。针对这两种类型的纳米颗粒，提出了热导率增强的回归模型。zeta电位结果表明纳米润滑剂具有优异的稳定性。热导率随纳米颗粒浓度的增加而增大，但随温度的升高而降低。回归模型的决定系数R²大于0.9952，平均偏差不超过0.29%。0.003体积%的SiO/PVE纳米润滑剂的COF比基线降低了15%。当浓度超过阈值时，纳米润滑剂的COF超过基础润滑剂的结果。SiO和TiO纳米颗粒的最佳浓度改善了PVE润滑剂的热性能和摩擦学性能，在应用于制冷系统时可能具有优势。
