Examination of selected properties of BNi-1a and BNi-2 coatings by DSI method

Abstract

This paper describes examination of selected mechanical properties of the Ni-Cr-B-Si coatings using the DSI method (Depth Sensing Indentation). The research was carried out on coatings obtained in a vacuum furnace-melting process of two alloys: BNi-1a and BNi-2. The alloys in paste form had a different content of Ni, Cr and Fe. Change in the content of these elements affects the size and density of the distribution of chromium borides. In the BNi-1a coating, the precipitations are fine-grained and densely distributed in the nickel matrix. While, in the BNi-2 coating they are larger and occur in dendritic agglomerations, on the surface they are in the form of plaques. The DSI tests showed that the BNi-1a coating has a higher hardness (by 22.4–25.0%), stiffness (by 39.4%) and creep resistance (by 7.9%) than the BNi-2 coating.