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首页> 外文期刊>同誌社大学理工学研究報告 >Fabrication of carbon nanofiber (CNF)-dispersed Al{sub}2O{sub}3 composites by pulsed electric-current pressure sintering and their mechanical properties
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Fabrication of carbon nanofiber (CNF)-dispersed Al{sub}2O{sub}3 composites by pulsed electric-current pressure sintering and their mechanical properties

机译：Fabrication of carbon nanofiber (CNF)-dispersed Al{sub}2O{sub}3 composites by pulsed electric-current pressure sintering and their mechanical properties

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Dense Al{sub}2O{sub}3-based composites (≥99.0 of theoretical) dispersed with carbon nanofibers (CNFs) were fabricated using the pulsed electric-current pressure sintering (PECPS) for 5 min at 1300℃ and 30 MPa in a vacuum. The dispersion of CNFs into the matrix depended much on the particle size of the starting Al{sub}2O{sub}3 powders. Mechanical properties of the composites were evaluated in relation with their microstructures; high values of three-point bending strength σ{sub}b (～800 MPa) and fracture toughness K{sub}(IC) (～5 MPa·m{sup}(1/2)) were attained at the composition of CNF/Al{sub}2O{sub}3=5:95 vol, which σ{sub}b and K{sub}(IC) values were ～25 and ～5, respectively, higher than those of monolithic Al{sub}2O{sub}3. This might be due to the small Al{sub}2O{sub}3 grains (～1.6 μm) of dense sintered composites compared with that (～4.4 μm) for the pure Al{sub}2O{sub}3 ceramics, resulting from the suppression of grain growth during PECPS induced by uniformly dispersed CNFs in the matrix.

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