Abstract
Sterling seal is a commonly used reciprocating seal, in which the PTFE ring of the seal and the surface material of the piston rod play an important role in the reciprocating sealing process. In this paper, a reciprocating sealing test bench was built, four sets of carbon fiber PTFE sealing rings were used to perform reciprocating sealing bench experiments with Cr-coated piston rods and DLC-coated piston rods. After the experiment, the used four sets of seals were taken as experimental samples, and a new, unused carbon fiber PTFE seal was taken as a reference sample. The surface topography, surface wear, and wear surface elements of the test specimens were measured by three-dimensional white light interference surface topography instrument, field emission environment scanning electron microscope, and field emission scanning electron microscope. Through experimental determination, it is found that the coating material is detached to form abrasive grains, which causes the surface of the sealing ring to wear. This paper also proposes optimization suggestions for the processing method of the sealing ring and the selection of the material of the piston rod coating.
Highlights
Study of Reciprocating SealingSeals are key infrastructure components in many high-tech fields, including the aerospace and ergonomics industries [1,2,3]
According to different experimental piston rod coating materials, each set of seals was tested twice: first, two new Sterling and Cr-coated piston rods were used for the experiment; second, two new Sterling seals and a DLC-coated piston rod were used for the experiment
Since the sealing ring PTFE material is softer than the piston rod coating material, the abrasive particles are off the piston rod coating material
Summary
Seals are key infrastructure components in many high-tech fields, including the aerospace and ergonomics industries [1,2,3]. In response to the problem of seal wear, the researchers have achieved a series of research results after more than half a century of research Such as the establishment of the seal elastohydrodynamic lubrication model to evaluate the performance of the seal, study the seal failure mechanism, and improve the seal ring structure and materials to improve the life and reliability of the seal [9,10,11,12,13,14,15,16,17,18,19,20]. The optimization of the processing technology of the sealing ring and the selection of the material of the piston rod coating is proposed
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