放電プラズマ法(SPS)によるW添加ZrB_2の合成同時焼結とその機械的特性

概要

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Dense zirconium boride (ZrB2)-based materials with and without tungsten (W) have been fabricated directly from mixtures of constituent elemental powders (Zr, B and W) by spark plasma sintering (SPS) at 1800°C for 10 min under 30 MPa in a vacuum. Formation processes of monolithic, W-doped ZrB2 solid solutions ZrB2 (ss) [(Zr1-xWx)B2 (0<x≤0.12)], and composites consisting of ZrB2 (ss) and WB2 were investigated. Their mechanical properties of bending strength (σb), Vickers hardness (Hv) and fracture toughness (KIC) at room temperature were evaluated. Solid solution and composite materials gave higher Hv (∼20 GPa), KIC (∼4.4 MPam1/2), and σb (∼600 and 690 MPa for the former and the latter, respectively) than those (14.1 GPa, 3.21 MPam1/2, and ∼500 MPa) of the monolithic ZrB2 ceramics fabricated under the same conditions.
社団法人粉体粉末冶金協会の論文
2007-08-15