Structure and mechanical properties of hot-pressed B4C-NdB6 composites |
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Affiliation: | 1. Key Laboratory of Materials Electromagnetic Process Ministry of Education, Northeastern University, Shenyang 110819, PR China;2. School of Metallurgy, Northeastern University, Shenyang 110819, PR China |
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Abstract: | High-performance B4C-NdB6 composites were fabricated by hot-pressing sintering at the temperature of 2050 °C for 20 min holding time and 20 MPa pressure with Nd2O3 (1~4 wt%) as the aiditive. The effects of Nd2O3 on the sintering process of the B4C were studied. The reaction mechanisms of B4C and Nd2O3 at different temperature were investigated. Based on the results of TG-DSC and thermodynamic calculation,. NdB6 was formed via Nd2O3 react with B4C in the sintering process, which greatly enhanced the densification of B4C and promoted the sintering process. The flexural strength, fracture toughness and hardness of the B4C-NdB6 composites rose to 366.42 MPa, 5.27 MPa m1/2 and 38 GPa by adding 3 wt% Nd2O3, respectively. The coexistence of transgranular and intergranular fracture is the major fracture mode. The phenomenon of pull-out contributed to improvement of the fracture toughness. |
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Keywords: | Reaction Structure and properties Pulled out |
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