放電プラズマ法(SPS)によるカーボンナノファイバー添加SiAlONセラミックスの作製と特性評価

概要

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Carbon nanofibers (CNFs: ∼150 nmφ and 4∼5 μml) added SiAlON (Si4Al2O2N6) composites were fabricated directly from mixtures of Si3N4, Al2O3, AlN, and CNF by spark plasma sintering (SPS) at 1700°C for 10 min under 30 MPa in a vacuum. Dispersion of CNFs up to ∼5 vol% into SiAlON matrix introduced the enhancement of densification and diminution of matrix grains, resulted in improvement of mechanical properties, such as bending strength σb (450→600 MPa) and fracture toughness KIC (4.1→4.5 MPa·m1/2); however, Vickers hardness Hv decreased monotonously from 17.7 to 12.2 GPa with increasing CNF content. In addition, homogeneous CNFs dispersion brought a drastic change in electric conductivity; insulative SiAlON ceramics changed into conductive materials with improved mechanical properties by a small amount of CNFs with more than ∼3 vol%.
社団法人粉体粉末冶金協会の論文
2007-08-15