Toughening Mechanism of B4C-Al2O3 Composite Ceramics

被引：0
作者：
Zhang, Wei [1 ]
Zhang, Jie [1 ,2 ]
机构：
[1] Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang
[2] School of Materials Science and Engineering, Shenyang University of Technology, Shenyang
来源：
Cailiao Yanjiu Xuebao/Chinese Journal of Materials Research | 2024年 / 38卷 / 08期
关键词：
B[!sub]4[!/sub]C-Al[!sub]2[!/sub]O[!sub]3[!/sub] composite ceramics; cleavage structure; crack propagation; fracture toughness; inorganic non-metallic materials; thermal expansion mismatch;
D O I：
10.11901/1005.3093.2023.521
中图分类号：
学科分类号：
摘要：
B4C ceramics has extremely high hardness, but its fracture toughness is low. In order to improve the fracture toughness of B4C ceramics, the effect of introducing the second phase Al2O3 on the fracture toughness of B4C ceramics is studied, and the toughening mechanism of B4C-Al2O3 composite ceramics is explored. The results indicate that the addition of Al2O3 as the second phase can improve the fracture toughness of B4C ceramics. Among others, the fracture toughness of B4C-Al2O3 composite ceramics with 40%Al2O3 reaches a maximum value of 4.96 MPa·m1/2. The toughening mechanism of B4C-Al2O3 composite ceramics is that Al2O3 grains experience cleavage cracking during the crack propagation, increasing the path of crack propagation; thus, part of crack propagation energy is consumed. Meanwhile, residual stress is generated between Al2O3 grains and B4C grains due to their thermal expansion mismatch. On the one hand, the compressive stress inside B4C grains is beneficial for inhibiting crack propagation. On the other hand, the tensile stress generated at the phase boundary between B4C grains and Al2O3 grains weakens the bonding of the phase boundary to some extent, leading to some cracks propagating along the phase boundary during the propagation process; therefore, some cracks are deflected, and so the fracture toughness of B4C-Al2O3 composite ceramics is improved. © 2024 Chinese Journal of Materials Research. All rights reserved.
引用
收藏
页码：614 / 620
页数：6
相关论文
共 29 条
  • [1] Zhang W., An overview of the synthesis of silicon carbide-boron carbide composite powders [J], Nanotechnol. Rev, 12, (2023)
  • [2] Zhang W, Yamashita S, Kita H., Progress in pressureless sintering of boron carbide ceramics-a review, Adv. Appl. Ceram, 118, 4, (2019)
  • [3] Zhang W., A review of tribological properties for boron carbide ceramics [J], Prog. Mater. Sci, 116, (2021)
  • [4] Zhang W., A novel ceramic with low friction and wear toward tribological applications: Boron carbide-silicon carbide, Adv. Colloid Interface Sci, 301, (2022)
  • [5] Zhang W, Chen X Y, Yamashita S, Et al., B<sub>4</sub>C-SiC ceramics with in-terfacial nanorelief morphologies and low underwater friction and wear, ACS Appl. Nano Mater, 4, 3, (2021)
  • [6] Hwang C, Yang Q, Xiang S, Et al., Fabrication of dense B<sub>4</sub>C-preceramic polymer derived SiC composite, J. Eur. Ceram. Soc, 39, 4, (2019)
  • [7] Chen W, Hao W H, Gao D Q, Et al., Effect of sintering temperature on microstructure and physical and mechanical properties of B<sub>4</sub>C matrix composite ceramic, Superhard Mater. Eng, 32, 6, (2020)
  • [8] Xu C M, Zeng H, Zhang G J., Pressureless sintering of boron carbide ceramics with Al-Si additives, Int. J. Refract. Met. Hard Mater, 41, (2013)
  • [9] Zhang W, Yamashita S, Kita H., Tribological properties of SiC-B<sub>4</sub>C ceramics under dry sliding condition, J. Eur. Ceram. Soc, 40, 8, (2020)
  • [10] Baharvandi H R, Hadian A M., Pressureless sintering of TiB<sub>2</sub>-B<sub>4</sub>C ceramic matrix composite, J. Mater. Eng. Perform, 17, 6, (2008)
123