Abstract

We investigated experimentally the tribological behavior of tailing grain contacts using a micromechanical apparatus which allows high precision of force and displacement measurements to derive contact stiffness. A technique was developed to apply biopolymer coating to the grain surfaces and the emphasis of the study was placed on the investigation of the influences of saturation conditions, the presence of polymer-based coating, and the abrasion on the frictional behavior of the grains. Material characterization was based on interferometry, micro-indentation and elemental composition analyses. Elastoplastic displacements dominated the first cycles of normal loading and the Young’s modulus was interpreted based on different contact models. The tailing grains showed significantly higher inter-particle friction compared with that of quartz grains. Three major characteristics which influenced the frictional behavior of the grain contacts were the abrasion, which was more dominant in the first loading cycles, the high roughness of the grains and the presence of the biopolymer coating which increased significantly the friction.

Graphic abstract

中文翻译：

---

铁尾砂颗粒在干燥，水和生物聚合物浸没状态下的摩擦学行为

摘要

我们使用微机械设备对尾矿粒接触的摩擦学行为进行了实验研究，该设备允许高精度的力和位移测量以得出接触刚度。开发了一种将生物聚合物涂层应用于谷物表面的技术，该研究的重点放在研究饱和条件，聚合物基涂层的存在以及磨蚀对谷物摩擦性能的影响上。材料表征基于干涉测量，微压痕和元素组成分析。弹塑性位移在正常载荷的第一个周期中占主导地位，并基于不同的接触模型解释了杨氏模量。与石英颗粒相比，尾矿颗粒显示出明显更高的颗粒间摩擦。

图形摘要