Designing interlocking joints between ceramic blades and a gas turbine metal disc

Developing advanced gas turbines using ceramic blades is an urgent problem for many engine manufactures in Russia and abroad. One of the main problems when creating a rotor with ceramic blades loaded by tensile centrifugal forces is to ensure the interlock strength. Two modifications of interlocking dovetails to be used in heavy-duty gas turbines are considered. A method for evaluating the strength reliability of such structures is proposed. The contact areas of metal and ceramic parts are investigated. It is shown that the static strength of the structure is provided by reducing the variations of the properties of the ceramic material. The blades were made of hot-pressed silicon nitride.

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