What are the disadvantages of oxide ceramics?

The disadvantages of oxide ceramics include:
Greater brittleness: This is one of the more obvious disadvantages of oxide ceramics, which limits their application in certain fields. For example, when subjected to large external forces or impacts, deformation, cracking, peeling and damage are prone to occur.
Relatively low thermal conductivity: Compared with some common high thermal conductivity metals (such as copper and aluminum), the thermal conductivity of oxide ceramics is mostly lower. Although the thermal conductivity of some oxide ceramics has improved, there is still a certain gap.
High-temperature phase change leads to volume change: Taking zirconia ceramics as an example, there are three crystal forms (monoclinic, tetragonal, and cubic phases). At room temperature, it only appears in the monoclinic phase. When heated to about 1100°C, it transforms into the tetragonal phase. If it is heated to a higher temperature, it will transform into the cubic phase; and when cooled, it will produce a large volume change in the opposite direction. The volume change produced during this phase change process is easy to cause the product to crack, limiting its application in high-temperature fields.
Performance has time-limited properties: Some oxide ceramics containing stabilizers (such as zirconia) have high toughness, but this high toughness is time-limited. For example, zirconia devices may become unstable after being placed for a period of time, resulting in serious performance degradation and cracking. In addition, this type of ceramic has no metastable phase at high temperature, and does not have the characteristics of high toughness, which seriously restricts its high-temperature use and room temperature aging.
Not wear-resistant, noisy, and easy to heat: For example, the zirconia ceramic bearings in some domestic CPU radiators are not wear-resistant, and cannot be lubricated during use. Most of them are generally noisy and easy to heat when running at high speed, which can easily cause the fan to burn out.
However, oxide ceramics also have many advantages, such as usually having a higher melting temperature, being very stable in an oxidizing atmosphere, having higher mechanical strength, electrical insulation properties and chemical stability, etc., and are widely used in many fields such as electronics, information, lasers, infrared, computers, aerospace, atomic energy, chemical industry, metallurgy, etc. Its performance will also be affected by many factors such as raw materials and preparation processes. By optimizing these aspects, the performance of oxide ceramics can be improved to a certain extent or the impact of its shortcomings can be reduced.
If you want to know the shortcomings of oxide ceramics, you can contact Superior Ceramics Times, and we will do our best to help you!