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首页> 外文期刊>Tribology Online >Influence of Surface Texture on Friction Properties of Mechanical Seals for Blood -Design Concept of Sealing Surface of Mechanical Seal for Ventricular Assist Device-
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Influence of Surface Texture on Friction Properties of Mechanical Seals for Blood -Design Concept of Sealing Surface of Mechanical Seal for Ventricular Assist Device-

机译：表面纹理对血液机械密封件摩擦性能的影响-心室辅助装置机械密封件密封表面的设计理念-

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摘要

Low, stable friction, a higher load-carrying capacity, and lower leakage of sealed blood are required for mechanical seals in implantable ventricular assist devices. One solution is to apply surface texture to the mechanical seal surface, consisting of self-mated silicon carbide. However, the effect of surface texture on the frictional properties of mechanical seals under blood sealing conditions has not yet been studied. Therefore, this study aimed to clarify the effect of surface texture on fundamental frictional properties of mechanical seals and to propose design concepts for mechanical seals in ventricular assist devices. The results show that surface texture increases the critical load of mechanical seals, although it also causes periodic peaks in friction. Further, it was found that surface texture induces the formation of denatured protein aggregates on the sealing surface, also inducing periodic surface friction peaks. The frictional properties of the mechanical seals were stabilized by creating small, dispersed concave features with wet blast fabrication, followed by coating with diamond-like carbon. Lower and more stable frictional properties were thus achieved, while simultaneously ensuring a higher critical load.
机译：对于植入式心室辅助设备中的机械密封，要求低而稳定的摩擦，更高的承载能力以及更低的密封血液泄漏。一种解决方案是将表面纹理应用于由自配合碳化硅组成的机械密封表面。然而，尚未研究在血液密封条件下表面质地对机械密封的摩擦性能的影响。因此，本研究旨在阐明表面纹理对机械密封件基本摩擦性能的影响，并提出心室辅助设备中机械密封件的设计概念。结果表明，表面纹理会增加机械密封的临界载荷，尽管它还会引起摩擦的周期性峰值。此外，发现表面质地诱导了在密封表面上变性蛋白质聚集体的形成，还诱导了周期性的表面摩擦峰。机械密封的摩擦性能通过湿喷工艺产生小的分散的凹形特征，然后涂覆类金刚石碳来稳定。因此获得了更低且更稳定的摩擦性能，同时确保了更高的临界载荷。

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