Thermal flame prayed composite powders containing chromium, titanium and tungsten carbides
Bolesław Formanek, Krzysztof Szymański Politechnika Śląska, Katedra Nauki o Materiałach, ul. Krasińskiego 8, 40-019 Katowice
Quarterly No. 1, 2006 pages 52-56
DOI:
keywords: composite powders, coatings, thermal spraying, abrasion wear, erosion wear
abstract The paper presents the results of research on coatings formed by subsonic flame spraying from materials containing carbide phases in a metallic matrix (NiCr, FeCr, Co). The coatings produced from commercial and synthesized powder materials are intended for operation under corrosion and erosion wear conditions at an elevated temperature. The powders were obtained from mechanically homogenized mixtures of base powders and powders obtained in a high-temperature synthesis. The coatings were thermally sprayed using the following powders: NiCr-Cr3C2, NiCr-Cr3C2-TiC, FeCr(Al)-Cr3C2- -TiC, Fe(Cu)-TiC, WC-Co and WC-Co-NiCrSiB. The powders are characterized in Table 1. Their morphology, observed on a scanning microscope, is presented in Figures 2 and 3. The technological parameters were determined for spraying the coatings with a METCO 5P-II gun. The coatings’ structure was determined by light microscopy methods. Selected microstructures of the coatings are shown in Figures 4 and 5. Thickness and porosity of the coatings were determined, as shown in Tables 2. The results of abrasion and erosion resistance tests are presented in a graphic form in Figures 6 and 7. It was found that it is better to spray powders of a complex phase composition using the supersonic or plasma methods.