He appears to be talking about a ceramic thermal barrier coating on metallic blades which is nothing special these days – I’ve had a close look at a sectioned AL-31F and it certainly seemed like it had a TBC on the LPT NGVs.
They’re saying it’s a specific Russian developed tech.
Possibly related…
..To reduce the RCS of an aircraft in the rear hemisphere measures need to be taken to reduce the RCS cavity of the exhaust nozzle of the engine, which has the largest radar return .
Therefore, during the production of new engines, effective application of radio absorbing coatings on the exhaust nozzle have to be undertaken.
The only material capable of withstanding both temperature ( up to 1200 ° C) and mechanical load characteristic for this part of the engine , is ceramics .
A multilayer ceramic coating has been developed. Melted dielectric and metal microparticles are sprayed on the engine components by using a high pressure semiconductor plasma arc discharge .
The main difficulty that had to be overcome – the creation of high adhesion between the relatively thick metal-ceramic layers and metal surface of the engine. As is well known , ceramics and basic metal aircraft structure have significantly different coefficients of thermal expansion. In addition, the temperature at which the coating has to retain its radiophysical properties, changes in a very broad range – from 600 to 1200 ° C.
Thus, it was necessary to develop materials , with dielectric and magnetic permeability which does not change in a wide temperature range. This problem is partially solved : the engines with ceramic radio absorbing coatings have been mounted on aircraft and tested in a variety of flight regimes….
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fragment from: Fundamental and Applied Problems – STEALTH TECHNOLOGY
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