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Large-scale specimen testing on friction and wear of pure and internally lubricated cast polyamides

机译：对纯和内部润滑的铸造聚酰胺进行摩擦和磨损的大规模试样测试

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Due to the casting process for nylons, their composition can easily be modified to cover a wide range of mechanical properties and applications, especially as large wear surfaces in, for example, crane guidances. Presently, selection tests for working conditions up to 40MPa are presented on pure Na-catalysed polyamides, oil-filled polyamides with homogeneous oil dispersions and holes in the surface containing oil lubricant and two types of thermoplastic solid-lubricated polyamides. Pure polyamides are, however, prone to high and unstable sliding at pressures as low as 10MPa with brittle fracture and lumpy transfer. Oil lubrication is not able to remove the sliding instabilities as oil supply to the sliding interface is controlled by migration effects that are restricted by deformation and thermal softening or melting of the poly amide matrix. Although friction and wear are lower and more stable for samples with oil supplied through lubricating holes, additional running-in phenomena are attributed to a relatively thick transfer film that is brittle and easily peels off. A continuous thick molten film or island-like deposition occurs on the polyamide surface. Solid lubricants are able to stabilize friction and lower wear down to the formation of a thin and coherent transfer film. However, increasing the amount of lubricants induces lower mechanical properties and higher deformation of the test samples. The differences in transfer behaviour are discussed with reference to optical microscopy and calculations of bulk and flash temperatures.
机译：由于尼龙的铸造工艺，很容易对其组成进行修改，以涵盖广泛的机械性能和应用，尤其是在起重机起重装置中的大磨损表面时。目前，对纯Na催化的聚酰胺，具有均匀油分散性且表面含油润滑剂的孔和两种热塑性固体润滑聚酰胺的含油聚酰胺进行了高达40MPa的工作条件选择测试。但是，纯聚酰胺在低至10MPa的压力下容易发生高且不稳定的滑动，并具有脆性断裂和块状转移。油润滑不能消除滑动不稳定性，因为向滑动界面的油供应受迁移作用控制，迁移作用受聚酰胺基体的变形和热软化或熔化限制。尽管对于通过润滑孔供油的样品，摩擦和磨损更低且更稳定，但附加的磨合现象归因于相对较厚的转印膜，该膜易碎且容易剥离。在聚酰胺表面上发生连续的厚熔融膜或岛状沉积。固体润滑剂能够稳定摩擦并降低磨损，直至形成薄而连贯的转印膜。但是，增加润滑剂的量会导致较低的机械性能和较高的试样变形。参照光学显微镜以及体积和闪蒸温度的计算讨论了转移行为的差异。

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