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High-temperature mechanical properties of ZrB2/SiC/Si3N4 ceramic tool materials with dual composite architectures
Ceramics International ( IF 5.1 ) Pub Date : 2021-09-20 , DOI: 10.1016/j.ceramint.2021.09.189
Jingbao Zhang 1, 2, 3 , Guangchun Xiao 1, 2, 3 , Mingdong Yi 1, 2, 3 , Zhaoqiang Chen 1, 2 , Jingjie Zhang 1, 2 , Hui Chen 1, 2, 3 , Xizuo Shang 4 , Chonghai Xu 1, 2, 3
Affiliation  

ZrB2/SiC ceramic granules with uniform a size and spherical shape were prepared by spray drying technology. ZrB2/SiC ceramic granules were added into ceramic matrix, and ZrB2/SiC/Si3N4 ceramic tool materials with double composite architectures were prepared by spark plasma sintering technology. The mechanical properties from room temperature to 1100°C were measured. The hardness, flexural strength and fracture toughness at room temperature are 18.0 GPa, 589.0 MPa and 5.93 MPa m1/2, respectively. While the fracture toughness at 1100°C reach 6.1 MPa m1/2 increase by 74.3% compared with the ceramic tool material without double composite architectures. At high temperature, the improvement of fracture toughness is due to the addition of ZrB2/SiC ceramic granules that deflect the cracks and propagates along the boundary between the granules and the matrix, which greatly increase the path during the crack propagation process, thereby improving the fracture toughness of the ceramic tool material.



中文翻译:

双复合结构ZrB2/SiC/Si3N4陶瓷刀具材料的高温力学性能

采用喷雾干燥技术制备了粒径均匀、球形的ZrB 2 /SiC陶瓷颗粒。在陶瓷基体中加入ZrB 2 /SiC陶瓷颗粒,采用放电等离子烧结技术制备了ZrB 2 /SiC/Si 3 N 4双重复合结构陶瓷刀具材料。测量了从室温到 1100°C 的机械性能。室温下的硬度、弯曲强度和断裂韧性分别为18.0 GPa、589.0 MPa和5.93 MPa m 1/2。而在 1100°C 下的断裂韧性达到 6.1 MPa m 1/2与没有双复合结构的陶瓷刀具材料相比,增加了 74.3%。在高温下,断裂韧性的提高是由于ZrB 2 /SiC陶瓷颗粒的加入使裂纹偏转并沿颗粒与基体的边界传播,大大增加了裂纹扩展过程中的路径,从而提高了陶瓷刀具材料的断裂韧性。

更新日期:2021-09-20
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