| Summary: | 碩士 === 義守大學 === 材料科學與工程學系碩士班 === 94 === The carbon nanotube (CNT) composites fabricated by the Sol-Gel and chemical vapor deposition (CVD) method were conducted in this study. The effects on the composite powder properties and the microstructure were discussed in term of the Sol-Gel catalysts with the different compositions and various CVD/sintering conditions. Furthermore, the mechanical properties, the tribological properties and the microstructure observation of the CNT composites, which consist of the various powders synthesized by hot press, were studied in depth.
Based on the XRD, SEM and TEM analyses, Fe(NO3)3/TEOS/Boehmite catalyst powders could produce the CNT and Mullite after the CVD/sintering reaction via two steps. As a result of hardness tests, the samples through the CVD reaction with two steps generally show the higher hardness more than the others. It is of great interest that the Fe(NO3)3/TEOS/Boehmite catalyst powder samples which consist of Mullite, α-Al2O3, SiO2 and CNT reveal the highest hardness. As for wearing tests at the constant pressure/speed and continuous wearing tests, the samples reinforced by CNT shows the tendency toward stable phenomenon in the friction traces with the progressing of wearing tests. The samples with the excellent mechanical properties and high hardness exhibit the lower weight loss. In addition, it is found that the Fe(NO3)3/TEOS/Boehmite catalyst powder samples via two step reaction possess the lowest weight loss among all samples.
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