What's The Differences Between Alumina And Zirconia?

Tonerde is a widely used technical ceramic material. Zirconium dioxide, including yttrium‐stabilised zirconium dioxide (YSZ), is also frequently employed in the machinery industry. Both materials may be sintered without vacuum, which results in similar manufacturing processes and a comparable external appearance. Nevertheless, there are several quantifiable differences between them.

Price: Tonerde vs. Zirconium Dioxide

The primary difference between these two materials is their price. The cost of zirconium dioxide is more than twice that of the highest grade aluminium oxide material. One factor is the cost of the raw material. Aluminium is considerably more abundant in the earth’s crust than zirconium and is therefore less expensive. In addition, yttrium oxide, which is commonly used as a stabiliser for zirconium dioxide, is a rare earth element with limited availability.

However, processing zirconium dioxide incurs the greatest expense. Due to its higher density compared to aluminium oxide, additional processing time is required. Grinding an identical thickness of zirconium dioxide takes up to ten times longer and consumes more diamond tools. Moreover, the reduced thermal shock resistance and the need for a higher sintering temperature contribute to increased processing costs, given that a higher sintering temperature directly results in higher energy consumption.

Applications: Aluminium Oxide vs. Zirconium Dioxide

Zirconium dioxide is used in the manufacture of mortar and pestle, grinding bowls and milling components, bearing balls, and ceramic parts in valves and pumps, owing to its improved wear resistance. Parts made from zirconium dioxide exhibit longer service life and yield lower contamination levels in grinding bowls. Although its mechanical performance is enhanced, aluminium oxide is preferred for ballistic applications because of its lower density.

Even though zirconium dioxide can withstand higher temperatures, its use in industrial furnaces remains limited. The incremental performance benefit at elevated temperatures does not compensate for its substantially higher cost.

High-density ZrO₂ also delivers improved corrosion resistance. In highly corrosive environments, zirconium dioxide maintains its integrity for a longer period and is regarded as a more effective material in chemical laboratories.

Generally, zirconium dioxide performs better when density and thermal shock resistance are not the critical parameters. However, its higher cost restricts its application, thereby leaving the larger portion of the market to aluminium oxide.