Protective Coatings Based on ZrO2-Y2O3 and Al2O3-TiO2 Systems with Modifying Additives on CCCM

The deposition of heat-resistant coatings on carbon-carbon composite material substrates with a previously deposited ZrN barrier layer and a NiCoCrAlY sublayer was carried out. The application of the barrier layer and the sublayer was carried out by ion-plasma spraying, and the deposition of heat-resistant coatings was carried out by atmospheric-plasma spraying in an argon flow. Samples were obtained with coatings of four compositions: 1 - ZrO2 + 8% Y2O3, 2 - 20% (ZrO2 + 8% Y2O3) + 80% MoSi2, 3 - 10% (ZrO2 + 8% Y2O3) + 90% MoSi2, 4 - Al2O3 + TiO2 + modifying agent. The samples were tested for heat resistance in a flow of an oxygen-acetylene burner at 2100A degrees C for 20 sec. The sample with the heat-resistant coating of composition 1 did not withstand the tests, samples with heat-resistant coatings of compositions 2 - 4 showed excellent results even after several test cycles.