The oxidation resistance and tribological properties of Ni-based composites with in situ/ex situ Al2O3 and TiC ceramic phases at high temperatures
Source abstract
Abstract
Ni-based composites with in situ formed Al2O3and TiC ceramic phases were fabricated by hot pressing technology and that with directly added Al2O3and TiC particles (ex situ) were also fabricated for comparison. The antioxygenic property and tribological properties of the composites were comparatively studied. The results show that the high-temperature oxidation resistance of the composite with in situ formed Al2O3and TiC ceramic is superior to that of ex situ composite, and the friction coefficient of in situ composite is lower than that of ex situ composite in the wide temperature range from 400 °C to 1000 °C. The lowest friction coefficient was about 0.19 at 1000 °C and the wear rate of the composites are in the order of magnitude of 10−6mm3/(N m) at high temperatures. The differences in tribological properties of in situ/ex situ composites are attributed to the formation of the glaze layer composed of MoO3, TiO2, Al2TiO5, NiAl2O4, and NiO on the worn surfaces and the difference of the distribution of the ceramics in the matrix.
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Research context
OpenAlex topics: Aluminum Alloys Composites Properties · Advanced materials and composites · Advanced ceramic materials synthesis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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