Efficiency, Performance and Robustness of Gas Turbines by K. Volkov
By K. Volkov
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Extra info for Efficiency, Performance and Robustness of Gas Turbines
Example text
For the applications in study, they are: 1. 2. 3. 4. 5. oxidation resistance; structural resistance to traction/compression and shear stresses; creep; tenacity; fatigue. 1 Oxidation resistance Many structural applications to high temperature demand the exposure to highly oxidant atmosphere: the thermal stability and the oxidation resistance to the oxide materials become of fundamental interest. A comparison of parabolic rates of oxidation for not oxidic ceramic materials is introduced in Figure 21.
Fig. 21. Oxidation curve Also the pure silicon carbide introduces an adapted resistance in the temperature range of interest, but the structural SiC and its fibres are typically lacking the necessary purity to obtain high levels of resistance, and consequently, present meaningful proprieties losses to 1200°C. A better quality in the realization of silicon carbide fibres is being obtained with the new formation processes to high temperature. The oxidic ceramic materials, on the other hand, do not present the necessary resistance in high temperature atmospheres.
For composites with polymeric and metallic matrix, the problem is not banal: the matrix can be, in fact, brought to the liquid state, and consequently during the cross-linking and the cooling processes, the amount and the dimensions of the vacancies are rather small. Different is the case of ceramic composites. The matrix cannot be melt, because (moreover the technological difficulties linked to the manipulation of the liquid phase at temperature over 2000°C) or it is decomposed before melting or its fusion temperature are much high to react with the tenacity phase.