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What properties make advanced structural ceramics useful in corrosive environments?

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Figure 1: Resistance to cracking in transformation-toughened zirconia. In a ceramic composed of tetragonal zirconia dispersed in a zirconia matrix, the stress field advancing ahead of a propagating crack transforms the small tetragonal particles to larger monoclinic particles. The larger particles exert a crack-closing force in the process zone behind the crack tip, effectively resisting propagation of the crack.
advanced structural ceramics Figure 1: Resistance to cracking in transformation-toughened zirconia. In a ceramic composed of tetragonal zirconia dispersed in a zirconia matrix, the stress field advancing ahead of a propagating crack transforms the small tetragonal particles to larger monoclinic particles. The larger particles exert a crack-closing force in the process zone behind the crack tip, effectively resisting propagation of the crack.

Advanced structural ceramics are highly valued in corrosive environments primarily due to the strength of their chemical bonding. These materials are held together by strong primary bonds—typically a mixture of ionic and covalent character—which render them exceptionally robust and chemically inert.123

Key properties that make them useful in these demanding conditions include:

  • Chemical Inertness: Because they are thermochemically stable, these ceramics resist degradation when exposed to corrosive substances, such as molten materials, gases, or chemical solutions. This inertness allows them to be used in diverse applications ranging from industrial chemical processing to bioceramics for the human body.124
  • Hardness and Strength: Their strong atomic bonds contribute to extreme hardness, which provides superior resistance to both impingement and rubbing wear in corrosive or erosive environments.4
  • Microstructural Control: Engineers can adjust the density and microstructure of these materials to suit specific needs. For instance, while porous structures can help with thermal shock resistance, high-density ceramics are specifically engineered to prevent the penetration of corrosive fluids in environments like glass-melting furnaces.2

By combining these properties, advanced structural ceramics offer significantly increased lifetimes compared to traditional materials like metals or polymers.14