Abstract
Wear-resistant high-alloyed tool-steel-based composites with different contents of fine-wear-resistant hard phases were prepared by vacuum sintering. As a hard phase, fine NbC particles in the quantity of 0.5–5 wt% were used. Compressibility of powder mixtures and sinterability of powder compacts with different NbC contents were investigated. Microstructures of vacuum-sintered composites were observed by light and scanning electron microscope. Microanalytical investigations by high-resolution Auger electron spectroscopy, X-ray diffraction spectroscopy and SEM/EDS analyses were performed. Microstructural investigations showed that no significant reaction between NbC particles and the steel matrix occurs. These investigations also showed that during the powder metallurgy synthesis of the composite, agglomeration of fine carbide phase occurred. Some suggestions are given on how to avoid the agglomeration of NbC particles during powder metallurgy synthesis.
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