The ceramic Eyelet(ceramic ring) is the most commonly used component for the wire passing, and it is used in the wire passing position of the coil winding machine and the textile machinery. Normally it is used for less demanding occasions. The shape, finish and the hardness of materials must be improved in order to reduce the friction because of the wire sliding in the surface of the ceramic rings. We select the 99% Al2O3 as material with the hardness more than HRa88 , the density of 3.85 and the ultra-precision polish degree Ra0.2.
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