MICROSTRUCTURE EVOLUTION OF COMPOSITE MATERIALS BASED ON TRANSITION METAL CARBIDES

摘要

The structural changes,which take place in sinters composed of a matrix based on transition metal carbides and the modifying phase in a form of low-melting chromium carbide Cr_(23)C6,are presented in the work. The investigations were run on three systems of materials: TiC_(0.85)-Cr_(23)C6,NbC_(0.95)-Cr_(23)C6 and WC-Cr_(23)C6. The modifier content changed in a range of 1.5 - 30 vol.%. The method of synthesis and preparation of the composite components and the sinters for purposes of microstructural examinations was discussed. The results of microstructure evolution of the investigated materials were shown. The results of the determination of element distribution (EDS),phase changes (XRD) and structural changes (Rietveld),made on the samples of investigated systems,were used in order to discuss the microstructure of sinters.