Preparation and properties of Zr2MoP2O12 ceramics with negative thermal expansion. (15th December 2016) - Isobe, Toshihiro
Abstract: This study presents a synthetic method for preparing Zr2 MoP2 O12 powder and its sintered body using a solid-state reaction and a pressureless sintering method, respectively. The optimum heating sequence required to synthesize Zr2 MoP2 O12 was 873 K for 4 h, 1173 K for 2 h and 1323 K for 30 min. The specific surface area of the obtained powder was 4.2 m 2 /g. Several sintering additives were evaluated to obtain the Zr2 MoP2 O12 sintered body, and the most stable additive was 2 mass% ZnO, which yielded a relative density of > 90% following sintering at 1173 K for 2 h. Young's modulus, Poisson's ratio, Vickers micro-hardness and fracture toughness of Zr2 MoP2 O12 sintered with 2 mass% ZnO were 81 GPa, 0.26, 3.1 GPa and 0.6 MPa · m 1/2, respectively. Graphical abstract: Highlights: A synthetic method for preparing Zr2 MoP2 O12 powder using a solid-state reaction was developed. A synthetic method for preparing Zr2 MoP2 O12 sintering body using a pressureless sintering method was developed. The optimum heating sequence for Zr2 MoP2 O12 synthesis was obtained. ZnO was found to be an effective sintering additive.