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The objective of this work was to study the subsurfaces of ZrB 2-20 vol % SiC ultra high-temperature ceramics after high-speed sliding against a high-carbon steel disk. Intense tribooxidation of the composite components as well as transfer layer generation was observed at sliding speeds as high as 11, 22 and 37 m/s with the formation of at least tw...
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Context 1
... XRD pattern shows the presence of zirconium diboride and silicon carbide in all samples tested. After testing at 11, 22 and 37 m/s the XRD shows the presence of tetragonal zirconia and only traces of monoclinic ZrO 2 phases ( Table 1). The XRD patterns of worn surfaces after sliding at 11, 22 and 37 m/s revealed the presence of Fe 3 BO 5 . ...Context 2
... into account the EDS results shown in Table 2 the transfer layer free areas are depleted by boron so that B/Zr ratio is rather low and simultaneously enriched by oxygen as compared to the as-sintered state. The results of XRD show the presence of zirconium dioxide (Table 1). Therefore, one may suggest that the gray transition layer in Figs. ...