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Fe(NO3)3/TEOS (tetraethoxysilane, Si(OC2H5)4)) and Fe(NO3)3/boehmite catalyst sol-gels combined with different chemical vapor deposition (CVD) growing/calcining processes were individually adopted to fabricate different carbon nanotube (CNT) composite powders and make different CNT/silica and CNT/alumina composites. Experimental results indicate that the Fe(NO3)3/TEOS and Fe(NO3)3/boehmite catalyst sol-gels with different CVD growing/calcining processes generate different products. Among those different products, CNTs could improve the tribological performance, stabilize the friction coef cient and reduce weight losses of specimens. Furthermore, ceramic products such as cristobalite, α-Al2O3 transformed from the Fe(NO3)3/TEOS and Fe(NO3)3/boehmite catalyst sol-gels at higher calcining temperatures could increase hardness and friction coef cient of specimens, however, they also result in more uctuant friction coef cient curves and higher weight losses. The nal products from different catalyst sol-gels via the two-step growing/calcining process could provide better mechanical and tribological properties of the specimens. The weight losses of CNT contained specimens with stable phase (α-Al2O3 or cristobalite) from different catalyst sol-gels via the two-step growing/calcining process are 1/4 to 1/2 of CNT free specimens and CNT contained specimens with metastable phase (γ-Al2O3 and amorphous SiO2) via the one-step growing/calcining process, respectively. [doi:10.2320/matertrans.M2017266]

Friction and Wear Behaviors of Carbon Nanotube Reinforced Silica and Alumina Matrix Composites Fabricated by Catalyst Sol-Gel and CVD Process