Ceramic fiber connectors and fiber patch cords are the most widely used and passive optical devices in fiber optic networks. The core component of the single-mode multimode active optical fiber connector, the main component of which is a zirconia ceramic sleeve (that is, the connector precision pin), the material used is yttria Y2O3 stabilized tetragonal zirconia powder. Its main uses are: Zirconia ceramic bearings Zirconia full ceramic bearings have anti-magnetic electrical insulation, wear resistance, corrosion resistance, oil-free self-lubrication, high temperature resistance, high cold resistance, etc., can be used in extremely harsh environments and special working conditions. At present, zirconia ceramic bearings have been adopted by miniature cooling fans, and its product life and noise stability are better than traditional ball and sliding bearing systems. Foxconn first adopted zirconia ceramic bearings in computer cooling fans.