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Corrosion Effect on Ceramic Properties
Book chapter

Corrosion Effect on Ceramic Properties

Yury G Gogotsi and Vladimir A Lavrenko
Corrosion of High-Performance Ceramics, pp 90-111
1992
DOI: https://doi.org/10.1007/978-3-642-77390-7_5

Abstract

Critical Stress Intensity Factor Strength Degradation Fracture Toughness Thermal Linear Expansion Coefficient Subcritical Crack Growth
The knowledge of the corrosion behaviour of ceramic materials is rather important for determining their fields of application (refractories, high-temperature insulation and others), especially when oxidation-induced variations of mechanical properties (including local damages) have no effect on the performance of a ceramic design. However, to specify the load carrying capacity of components of gas turbines and Diesel engines, this information is insufficient, since corrosion-induced variations of composition and structure of a ceramic surface influence the strength of the material (Table 5.1), lead to the failure of components and the engine itself during operation. Oxidation also exerts a considerable influence on the physical properties, e.g. thermal and electrical conductivity. It involves the growth of SiO2 contents in ceramics and an increase of their thermal linear expansion coefficients as a result [5.1]. But conclusions of possible oxidation-induced changes of ceramic properties can be made only from the investigations of corrosion mechanism and kinetics. Therefore, the impact of corrosion on the physico-mechanical properties of ceramics requires further examination.

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