Impregnation of the surface of niobium alloy when grinding with corundum and silicon carbide wheels

The features of the formation of a relief after grinding a niobium alloy with abrasive tools made of corundum and silicon carbide on a ceramic bond are considered. The treated surface is studied with a scanning two-beam electron microscope. Keywords: niobium, grinding, corundum, silicon carbide, material transfer, impregnation, micro-X-ray pattern. [email protected]

The Protection, Challenge, and Prospect of Anti-Oxidation Coating on the Surface of Niobium Alloy

Niobium (Nb)-based alloys have been extensively used in the aerospace field owing to their excellent high-temperature mechanical properties. However, the inferior oxidation resistance severely limits the application of Nb-based alloys in a high-temperature, oxygen-enriched environment. Related scholars have extensively studied the oxidation protection of niobium alloy and pointed out that surface coating technology is ideal for solving this problem. Based on the different preparation methods of Nb-based alloys’ surface coatings, this article summarizes the relevant research of domestic and foreign scholars in the past 30 years, including the slurry sintering method (SS), suspension plasma spraying method (SPS), and halide activated pack cementation method (HAPC), etc. The growth mechanism and micromorphology of the coatings access by different preparation methods are evaluated. In addition, the advantages and disadvantages of various coating oxidation characteristics and coating preparation approaches are summarized. Finally, the coating’s oxidation behavior and failure mechanism are summarized and analyzed, aiming to provide valuable research references in related fields.

Investigation of the Fine Structure of 5 VMC Niobium Alloy Samples After Internal Nitriding

The paper considers the possibility of studying the fine structure of samples made of niobium alloy 5 VMC (grade 5B2MC-2), which underwent internal nitriding by X-ray diffraction analysis.The calculation of the dislocation density, which represents one of the parameters of the fine structure using various techniques, is shown. Its influence on the possible modes of internal nitriding is considered.