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ceramic materials that demonstrate enhanced mechanical properties under demanding conditions. Because they serve as structural members, often being subjected to mechanical loading, they are given the name structural ceramics. Ordinarily, for structural applications ceramics tend to be expensive replacements for other materials, such as metals, polymers, and composites. For especially erosive, corrosive, or high-temperature environments, however, they may be the material of choice. This is because the strong chemical bonding in ceramics-described in the article ceramic composition and properties: Chemical bonds-makes them exceptionally robust in demanding situations. For example, some advanced ceramics display superior wear resistance, making them ideal for tribological (wear) applications such as mineral processing equipment. Others are chemically inert and therefore are used as bone replacements in the highly corrosive environment of the human body. High bond strengths also make ceramics thermochemically inert; this property shows promising areas of application in engines for automobiles, aerospace vehicles, and power generators.