GU Shijia 1, WANG Minghui 2, XU Hongjie 3, JIANG Wan 1
(1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620; 2. Research Center of Analysis and Measurement, Donghua University, Shanghai 201620; 3. Shanghai Career Metallurgy Furnace Material Co. Ltd., Shanghai 201908)
Abstract: Boron carbide (B4C) ceramic composites were fabricated by hot-pressing at 2000 ℃ for 1h with B2O3 and Si through reactive sintering. The effect of B2O3 and Si content on the density and mechanical properties of the composites was studied. The results show that the density and mechanical properties of B4C ceramics prepared by adding B2O3 and Si were significantly improved. When 5wt.% B2O3and 5wt.% Si are added, the relative density, hardness, fracture toughness and flexural strength of B4C ceramics is 99.3%, 30.9 GPa, 4.59 MPa · m1/2 and 442 MPa, respectively. When 1wt.% B2O3 and 1wt.% Si are added, the fracture toughness of B4C ceramics can reach 4.97 MPa · m1/2.
Key words: boron carbide ceramic; boron oxide; silicon; hot-pressing; mechanical properties