Effect of TaC on phase, microstructure and mechanical properties of Ti(C0.7N0.3)-based cermets
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摘要: 为了制备高硬度高韧性的Ti(C0.7N0.3)基金属陶瓷,采用1600℃真空无压烧结制备了含TaC的Ti(C0.7N0.3)-WC-Mo2C-VC-AlN-Ni/Co系金属陶瓷,研究了不同TaC 含量(0wt%、5wt%、10wt%、15wt%)对金属陶瓷的物相、显微结构、力学性能的影响。结果表明,随着TaC含量增加,Ti(C0.7N0.3) (200)主峰逐渐向低角度偏移,环形相的厚度逐渐增大,金属陶瓷的维氏硬度和断裂韧性均先增大后减小。当TaC含量为10wt%时,核芯相细化,尺寸离散度最小,环形相发育更完整且均匀,金属陶瓷获得最高的维氏硬度和断裂韧性,分别为(17.79±0.15) GPa和(10.20±0.39) MPa·m1/2。
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关键词:
- Ti(C0.7N0.3)基金属陶瓷 /
- TaC /
- 物相 /
- 显微结构 /
- 力学性能
Abstract: In order to prepare Ti(C0.7N0.3)-based cermets with high hardness and high toughness, Ti(C0.7N0.3)-WC-Mo2C-VC-AlN-Ni/Co cermets containing TaC were prepared by vacuum pressureless sintering at 1600℃. The effects of different TaC content (0wt%, 5wt%, 10wt%, 15wt%) on the phase, microstructure and mechanical properties of cermets were investigated. The results show that with the increase of TaC content, the main peak of Ti(C0.7N0.3) (200) gradually shifts to a lower angle, the thickness of rim phase increase gradually and the Vickers hardness and fracture toughness of cermet firstly increased and then decreased. When 10wt% TaC is added, the core phase size of cermets is refined with the smallest, and the rim phase is more complete and uniform, leading to the maximum Vickers hardness ((17.79±0.15) GPa) and fracture toughness ((10.20±0.39) MPa·m1/2) of cermet.-
Key words:
- Ti(C0.7N0.3)-based cermets /
- TaC /
- phase /
- microstructure /
- mechanical properties
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图 2 不同TaC含量的Ti(C0.7N0.3)基金属陶瓷的SEM-背散射电子成像(BSE)图像: (a) Ti(C0.7N0.3);(b) 5wt%TaC/Ti(C0.7N0.3);(c) 10wt%TaC/Ti(C0.7N0.3);(d) 15wt%TaC/Ti(C0.7N0.3)
Figure 2. SEM-backscattered electron (BSE) images of Ti(C0.7N0.3)-based cermets with different amounts of TaC: (a) Ti(C0.7N0.3); (b) 5wt%TaC/Ti(C0.7N0.3); (c) 10wt%TaC/Ti(C0.7N0.3); (d) 15wt%TaC/Ti(C0.7N0.3)
图 6 不同TaC含量的Ti(C0.7N0.3)基金属陶瓷的裂纹扩展:(a) Ti(C0.7N0.3);(b) 5wt%TaC/Ti(C0.7N0.3);(c) 10wt%TaC/Ti(C0.7N0.3);(d) 15wt%TaC/Ti(C0.7N0.3)
Figure 6. Crack propagation of Ti(C0.7N0.3)-based cermets with different amounts of TaC: (a) Ti(C0.7N0.3); (b) 5wt%TaC/Ti(C0.7N0.3); (c) 10wt%TaC/Ti(C0.7N0.3); (d) 15wt%TaC/Ti(C0.7N0.3)
表 1 Ti(C0.7N0.3)基金属陶瓷试样的原料配比
Table 1. Raw material ratio of Ti(C0.7N0.3)-based cermets sample
Sample Chemical composition/wt% Ti(C0.7N0.3) WC Co Ni VC Mo2C AlN TaC Ti(C0.7N0.3) 59 15 6.5 6.5 5 6.5 1.5 0 5wt%TaC/Ti(C0.7N0.3) 54 15 6.5 6.5 5 6.5 1.5 5 10wt%TaC/Ti(C0.7N0.3) 49 15 6.5 6.5 5 6.5 1.5 10 15wt%TaC/Ti(C0.7N0.3) 44 15 6.5 6.5 5 6.5 1.5 15 表 2 不同TaC含量的Ti(C0.7N0.3)基金属陶瓷的密度和相对密度
Table 2. Density and relative density of Ti(C0.7N0.3)-based cermets with different TaC contents
Sample Ti(C0.7N0.3) 5wt%TaC/Ti(C0.7N0.3) 10wt%TaC/Ti(C0.7N0.3) 15wt%TaC/Ti(C0.7N0.3) Density/(g·cm−3) 6.44 6.54 6.90 6.79 Relative density/% 99.98 99.86 99.52 95.77 -
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