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首页> 外文期刊>Polymer Testing >Effect of test scale on the friction properties of pure and internal-lubricated cast polyamides at running-in
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Effect of test scale on the friction properties of pure and internal-lubricated cast polyamides at running-in

机译：试验规模对磨合过程中纯润滑和内部润滑的铸聚酰胺摩擦性能的影响

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Friction and wear tests for polymers are mostly done on small-scale tribotesters. The effect of different test scales on friction and efficiency of internal lubricant is investigated in this paper. Three scales are used with different contact area sizes, contact geometries and normal loads: flat-on-flat meso-scale tests, cylinder-on-plate small-scale tests and flat-on-flat large-scale tests. Selection tests are presented for (i) pure sodium-catalysed polyamides PA-Na, (ii) pure magnesium-catalysed polyamides PA-Mg, oil-filled polyamides with (iii) homogeneous oil dispersions in the bulk or (iv) holes in the surface with oil lubricant and (v) thermoplastic solid-lubricated polyamides. Running-in against steel counterfaces is examined over one single or 10 reciprocating sliding strokes, neglecting thermal effects and transfer film formation. The effects of mechanical contact and intrinsic material properties are detailed. No unique extrapolation as a function of pv parameters can be made. On every scale, PA-Na has higher coefficients of friction than PA-Mg due to ductile bulk properties for PA-Mg. Elastic contact corresponds to decreasing coefficients of friction with normal load. A transition into high and unstable friction on small- and large-scale tests coincides with the onset of plastic deformation. The test scale and contact surface area mainly affects the efficiency of internal lubricants. Solid lubricants are most favourable for low friction on large-scale tests, while oil lubricants are most efficient in meso-scale tests. This is explained by the oil supply mechanisms of diffusion and migration. The lower coefficients of friction for filled polyamides compared to pure polyamides are mainly attributed to lower surface energies and lower adhesion. (c) 2007 Elsevier Ltd. All rights reserved.
机译：聚合物的摩擦和磨损测试大部分是在小型三botester上进行的。本文研究了不同测试规模对内部润滑剂的摩擦和效率的影响。使用三种具有不同接触面积大小，接触几何形状和法向载荷的秤：平放平中观测试，圆筒上小规模测试和平放大型测试。提出了（i）纯钠催化的聚酰胺PA-Na，（ii）纯镁催化的聚酰胺PA-Mg，含油聚酰胺，（iii）整体中油分散均匀或（iv）孔中有油的聚酰胺的选择试验。表面用油润滑剂和（v）热塑性固体润滑聚酰胺。在一个或十个往复的滑动行程中检查了与钢对接面的磨合，忽略了热效应和转移膜的形成。详细介绍了机械接触和固有材料性能的影响。无法根据pv参数进行唯一的外推。在各种规模上，由于PA-Mg的延展性，PA-Na的摩擦系数均高于PA-Mg。弹性接触对应于法向载荷下摩擦系数的减小。在小规模和大规模试验中，向高摩擦和不稳定摩擦的过渡与塑性变形的发生相吻合。测试规模和接触表面积主要影响内部润滑剂的效率。固体润滑剂在大规模试验中最有利于低摩擦，而油润滑剂在中规模试验中最有效。这可以通过扩散和迁移的石油供应机制来解释。与纯聚酰胺相比，填充聚酰胺的摩擦系数较低，这主要归因于较低的表面能和较低的附着力。 （c）2007 Elsevier Ltd.保留所有权利。

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