Breviary Technical Ceramics






5.2 Classification of Useful Properties

The stress-strain relationship, which is often crucial for mechanical applications, is illustrated in Figure 80 using the example of a steel, an Al2O3 ceramic and a thermoplastic. The limited breaking elongation of the ceramic compared to that of metals, combined with an often significantly lower fracture toughness KIC, is generally to be considered a disadvantage, although it simultaneously entails the advantage of dimensional stability, in particular at high temperatures.

Figure 80: Stress-strain behaviour of selected materials


(*) Data not usually provided
Table 8: A comparison of typical mechanical characteristics of some ceramics with grey cast-iron and construction steel


Table 9: Technical aspects and relevant properties of ceramics


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