Abstract
3C-SiC axis nanowires were produced during the diamond/SiC composite green body pyrolysis. The morphology and microstructure of the 3C-SiC axis nanowires and diamond/SiC composite blank were observed by scanning electron microscope and transmission electron microscope. The compositions of the 3C-SiC axis nanowires and diamond/SiC composite blank were characterized by X-ray diffraction and X-ray photoelectron spectroscopy. The pore size and the pore size distribution of the green body and pyrolyzed body were measured using the mercury intrusion porosimeter (MIP) method. The results showed that the 3C-SiC axis nanowires were coated with a SiOx amorphous layer. The nanowires varied in length, and their diameters lied in the range of 25–35 nm. The pore diameters of the green body and pyrolyzed body are 10–26 μm and 0.5–25 μm, respectively. The generation of nanowires leads to a decrease in the pore size of the pyrolyzed body. The increase in porosity of the pyrolyzed body was caused by the formation of porous amorphous hard carbon by the pyrolysis of phenolic resin.
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