Abstract
The article describes a method for obtaining samples of a heat-resistant nickel-based alloy, followed by applying a composite coating. Model high-temperature alloys based on Ni-Cr (20Kh23N18) with a given structure have been obtained. Manufacturing of experimental castings included the following operations: heating of the measured charge billet of the finished alloy; heating to a temperature of 1600 °C and melting the metal in a vacuum of 10−2–10−4 Pa; pouring the sample into a mold at a metal temperature of 1480–1530 °C, the mold temperature was 950–1000 °C. Mathematical model of the ingot formation process was calculated, reflecting the crystallization sequence and the continuity of the volume supply along the height, the temperature field of the composite shell, have been performed. The developed mathematical model showed that during the production of ingots, the melt should be poured at a constant level in the funnel. To apply a two-layer coating with inner metal and outer ceramic layers on the prepared surface of the matrix of the heat-resistant 20Kh23N18 alloy: Cr/Al/Co + ZrO2-Y2O3, an ion-plasma technology was proposed.