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Journal of Inorganic Materials

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2008 , Vol. 23 >Issue 6: 1175 - 1178

DOI: https://doi.org/10.3724/SP.J.1077.2008.01175

Research Paper

Densification and Mechanical Properties of Boron Carbide Ceramics with Addition of Silicon Hexaboride

  • MA Qian-Cheng ,
  • ZHANG Guo-Jun ,
  • KAN Yan-Mei ,
  • WANG Pei-Ling ,
  • XIA Yi-Ben
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  • 1. College of Material Science and Engineering, Shanghai University, Shanghai 200072, China; 2. State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China

Received date: 2008-01-11

  Revised date: 2008-03-13

  Online published: 2008-11-20

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Abstract

Boron carbide (B4C) ceramics were fabricated by hot-pressing at 2000℃ for 1h with 2wt% and 5wt% SiB6 additives respectively. The effect of addition of SiB6 on sinterability and mechanical properties of B4C ceramics was studied. The results show that B4C ceramics can be fully densified by the addition of SiB6 and thus the mechanical properties of the sintered samples are effectively improved. When 2wt% SiB6 is added, the bulk density of B4C ceramics reaches 2.515g/cm3 which is about 99.5% of the theoretical density, while hardness and flexural strength of the sintered sample are 31.2GPa and 426.6MPa respectively. With the amount of SiB6 increase to 5wt%, the density, hardness and flexural strength of B4C ceramics are reduced to 2.500g/cm3, 29.7GPa and 387MPa respectively. On the other hand, the adding amount of SiB6 does not make a remarkable effect on fracture toughness of B4C samples since the K1C values in both cases are around 3.2MPa·m1/2. The phase assemblages and the reasons induced the changes in mechanical properties of the sintered samples with addtion of SiB6 are also discussed.

Key words： hot-pressing; boron carbide (B4C); silicon hexaboride (SiB6)

Cite this article

MA Qian-Cheng , ZHANG Guo-Jun , KAN Yan-Mei , WANG Pei-Ling , XIA Yi-Ben . Densification and Mechanical Properties of Boron Carbide Ceramics with Addition of Silicon Hexaboride[J]. Journal of Inorganic Materials, 2008 , 23(6) : 1175 -1178 . DOI: 10.3724/SP.J.1077.2008.01175

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