Assessing the lubrication performance of vegetable oil-based nano-lubricants for environmentally conscious metal forming processes
Assessing the lubrication performance of vegetable oil-based nano-lubricants for environmentally conscious metal forming processes
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DOI：
10.1016/j.jclepro.2016.07.040
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发表时间：
2016-11
影响因子：
11.1
通讯作者：
Behrooz Zareh-Desari;B. Davoodi
中科院分区：
文献类型：
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作者：
Behrooz Zareh-Desari;B. Davoodi
在金属成形过程中，使用润滑剂在工具-工件界面处提供理想的摩擦学环境对于提高材料的成形性、延长工具寿命和抑制能量损失是必不可少的。随着对传统金属成形润滑剂的实质性危险影响的认识和关注的增加，向前迈出的一步是至关重要的，以用与环境友好且相容的润滑剂来取代它们。尽管植物油作为绿色润滑剂具有巨大的潜力，但其有限的摩擦学特性限制了其应用。因此，本研究将植物油的生物降解性和无毒特权与纳米颗粒添加剂的减摩和极压能力相结合，以开发具有环境友好特征的高性能润滑剂。将CuO和SiO2纳米粒子以不同浓度分散在大豆油和菜籽油中，并与CM 202 A冲压拉拔油和磷酸锌钠皂固体润滑剂进行润滑性能比较。使用标准环压缩测试来评估所考虑的润滑剂的效率。采用摩擦系数和变形载荷两个关键因素进行性能比较。采用有限元模拟提供了估算摩擦系数所需的摩擦校准曲线。结果表明，植物油的润滑性与其化学结构有关。随着纳米颗粒浓度的增加，摩擦因数和变形载荷在一定浓度下达到最小值。根据所获得的结果，在0.5-0.7重量%的范围内确定了纳米颗粒的最有效浓度，其提供了21-31%的增强。它表明，植物油基纳米润滑剂，其中富含最佳量的纳米粒子具有与传统润滑剂相媲美的减摩能力。这项研究的成果可以在开发更环保的金属成形工艺方面取得丰硕成果。
In metal forming processes, employing lubricants for providing desirable tribological circumstances at tool-workpiece interface is essential to increase the material formability, prolonging tool life and suppressing energy loss. With increasing the awareness and concerns towards the substantial hazardous effects of conventional metal forming lubricants a step forward is crucial to replace them with benign and compatible lubricants with environment. Despite the fact that vegetable oils have an immense potential to be utilized as green lubricants, but the limited tribological characteristics of them restrict their applications. Hence, the biodegradability and non-toxicity privileges of vegetable oils have been incorporated with friction reduction and extreme pressure capabilities of nanoparticle additives in this study, to develop a high performance lubricant with environmentally friendly feature. The CuO and SiO2nanoparticles were dispersed in soybean and rapeseed oils in diverse concentrations and their lubrication performance were compared with two conventional metal forming lubricants, CM202A press drawing oil and solid lubricant of zinc phosphate plus sodium soap. The standard ring compression test was utilized to evaluate the efficiency of considered lubricants. The performance comparison was made using two key factors of friction coefficient and deformation load. The necessary friction calibration curves for estimating friction coefficient were provided employing finite element simulation. The acquired results convey that the lubricity of vegetable oil is dependent on its chemical structure. With increasing the concentration of nanoparticles, the friction factor and deformation load reach to a minimum for a certain amount of concentration. According to obtained results, the most efficient concentration of nanoparticles was determined within the range of 0.5–0.7 wt%, which provides 21–31% enhancement. It is demonstrated that the vegetable oil-based nano-lubricants which are enriched with optimum amounts of nanoparticles have the friction reduction capability comparable to conventional lubricants. The outcomes of this study can be fruitful in developing more environmentally conscious metal forming processes.