Purpose. Wear-resistant composite alloys for brazing onto contact surfaces of shroud shelves of turbine blades of aircraft gas turbine engines and ground power and pumping gas turbine units. Used in the manufacture and repair of turbine blades made of nickel and cobalt alloys.
Application area. The developed composite alloys of the Co-TiS system are intended for use in high-temperature and highly loaded units of an aircraft engine. It can also be used in other branches of mechanical engineering.
Advantages. Compared to conventional analogues, the matrix of the developed alloy is highly alloyed, its heat resistance is at the level of the best world single-crystal nickel alloys, but the content of carbides in the alloy is 50% (volume). The introduction of the development into production will increase the service life of a turbine blade – one of the most loaded elements of a gas turbine engine to more than 12,000 hours.
Description. Alloys of the Co-TiS system have high tribological characteristics under high-temperature fretting conditions. They can operate for a long time under friction conditions without a lubricant. Application of Co-TiS powder alloys by plasma spraying (PVD) allows obtaining a fine-grained structure, which allows applying thin-layer coatings to critical parts of the GTE. The use of powder alloys allows producing plates for soldering on the contact surfaces of the shroud shelves of the GTE blades immediately in finished form with an allowance for finishing surface treatment. This will reduce the time and labor intensity of the process of manufacturing such plates by other methods, in particular the processes of cutting such plates from massive castings or other types of blanks. Manufacturing plates for soldering by powder metallurgy (in particular, GIP) will also reduce the consumption of the material itself (the utilization factor of the blank is more than 0.92).