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

Resumo

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 2100°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.