These are the products descripton and i googled it thhe adding of the zirconia dioxide to the ceramic gives it alot of strength and durabilitty for what it reads
Product features
【ZrO2 and PTFE】This ceramic bearing is made of high quality ceramic ZrO2 and PTFE material, high precision and high speed.
【full ceramic】The is a full ceramic ball bearing with diamagnetic electrically insulating, has better performance than metal ball ceramic bearings.
【anti-corrosion 】Resistant to corrosion and able to operate in harsh conditions.
【smooth】Small frictional resistance, low power consumption, high mechanical efficiency, more efficient than metal bearings.
【wide applications】Standardization size, can be used for machinery manufacturing, equipment installation and maintenance.
Unlike other ceramic materials, zirconium oxide (ZrO2 –also known as zirconia) is a material with very high resistance to crack propagation. Zirconium oxide ceramics also have very high thermal expansion and are therefore often the material of choice for joining ceramic and steel.
Zirconia Is a Ceramic. Zirconia, like many ceramics, contains metal atoms, but it's not a metal. It's a ceramic, one which combines the biocompatible aspects ofceramics with a very high strength–stronger than titanium in some ways. Zirconia is zirconium dioxide (ZrO2)
