The influence of magnesium oxide on the sintering temperature and density of alumina ceramics

   Magnesium oxide is a very common alkaline oxide widely used in the production of magnesium hydroxide and metallic magnesium. I

         Magnesium oxide is a very common alkaline oxide widely used in the production of magnesium hydroxide and metallic magnesium. In the field of ceramics, magnesium oxide is highly favored due to its extremely high melting point (up to 2800 ℃) and unique properties. It can be directly sintered into magnesium oxide ceramics or used as an additive. Therefore, magnesium oxide plays an important role in the application of ceramic materials. Today, we will analyze the impact of magnesium oxide as a sintering additive on the various properties of alumina ceramics.
           1、 The influence of sintering temperature on alumina ceramics
Adding an appropriate amount of magnesium oxide can promote the sintering process of alumina ceramics, effectively reduce the sintering temperature of alumina ceramics, and improve their sintering density and wear resistance. Zehui's research found that with the addition of 10% magnesium oxide, the sintering temperature of alumina ceramics can be reduced by 120 ℃. At the same time, its wear resistance has also been greatly improved.
            This is because the addition of magnesium oxide can promote the diffusion and bonding between alumina particles. Specifically, the addition of magnesium oxide can lead to diffusion of grain boundaries and chemical reactions on the surface of particles, thereby forming a layer of magnesium rich liquid phase grain boundaries between alumina particles, accelerating particle binding and diffusion, and reducing sintering temperature.
             2、 The influence on the density of alumina ceramics
             The density of alumina ceramics is one of the important performance indicators, which is related to their mechanical properties, wear resistance, and corrosion resistance. Adding an appropriate amount of magnesium oxide can lower the sintering temperature, inhibit grain growth, reduce the porosity of alumina ceramics, and improve their density.
Research has shown that the addition of magnesium oxide can change the crystal growth mode and structure of alumina ceramics, promote the uniform distribution and arrangement of its grains, and thus reduce the formation of defects and pores.
             3、 Summary
             In summary, magnesium oxide has a significant impact on the sintering temperature and density of alumina ceramics.