Zirconia ceramic plungers and alumina ceramic plungers, as two important branches in the field of ceramic materials, play an irreplaceable role in different industrial scenarios by virtue of their unique material properties. An in-depth comparison of the two will help you choose the right ceramic plunger to ensure the efficient and stable operation of your equipment.
Zirconia ceramic plungers use zirconia (ZrO₂) as the main raw material. Zirconia has three crystal types: monoclinic, tetragonal and cubic. During the heating and cooling process, the crystal type is transformed, which absorbs energy and gives zirconia ceramics a good toughness, making them less likely to rupture when subjected to external impacts. The hardness of zirconia ceramics is 8-9 on the Mohs hardness scale, which is extremely high.
Alumina ceramic plungers are based on aluminum oxide (Al₂O₃), and their performance is closely related to their purity. High-purity alumina ceramics have a Mohs hardness of 7 – 8, a stable crystal structure that gives them a high melting point and good chemical stability, but due to the lack of zirconia-like crystal transition mechanisms, their toughness is relatively weak.
Zirconia ceramic plungers, with their combination of high hardness and excellent toughness, are able to resist wear and maintain surface integrity and smoothness under long-term continuous friction conditions. In mechanical seals, zirconia ceramic plungers significantly reduce friction loss, extend seal life and reduce equipment maintenance costs.
In contrast, although alumina ceramic plungers also have higher hardness, the toughness is not enough; in the high-speed, high-pressure friction environment, its surface is prone to flaking, cracks and other problems, resulting in a decline in abrasion resistance, affecting the normal operation and service life of the equipment.
Zirconia ceramic plunger in strong acid and alkali, organic solvents and other extreme chemical media, showing strong corrosion resistance, can work stably for a long time, so it is commonly used in chemical reactor lining, corrosive liquid transfer pumps and other equipment.
Alumina ceramic plunger has good chemical stability in regular chemical environments, but when facing strong oxidizing acid, strong alkali and other special corrosive media, its surface may undergo chemical reaction and corrosion phenomenon, which limits its application in special chemical environments.
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