Wear behavior of PTFE-coated continuous alumina fiber sewing thread

Abstract

Combined with sizing and two-dimensional knitting technology，continuous alumina fiber sewing threads with partial covering structures of F-3，F-4 and F-5 were prepared，and the effect of covering structure on the wear behavior between sewing threads and pinholes was studied by using a self-developed experimental device. The contour appearance of sewing threads with different coating structures and the damage morphology evolution under friction were characterized by 3D profilometer. Through the tensile tests，the strength retention rate of sewing thread under different rubbing times was characterized. The wear performance of sewing thread under different experimental parameters was evaluated by the number of wear breaks. The results show that the change of coating process parameters affects the fluctuation state of sewing thread surface profile，which leads to the increase of hairiness length after wear with the increase of coating yarn number and knitting pitch. Compared with the original yarn and sizing yarn，the wear resistance of sewing thread is significantly improved. With the increase of rubbing times，the strength retention rate of sewing thread shows a rapid decline and then tends to be flat. When rubbing times reach 30 times，the strength retention rates of F-3，F-4 and F-5 sewing threads are 12.89%，28.82% and 18.35% respectively. With the increases of friction distance and yarn tension and the decrease of friction angle，the number of wear-out of sewing thread decreases gradually.

Keywords

• continuous alumina fiber
• sewing thread
• wear
• semi-coated structure