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不同碳/氮比的Ti(C x , N1- x )基金属陶瓷的显微组织与性能
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四川大学 机械工程学院,四川 成都 610065

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基金项目:

国家自然科学基金项目(No.51634006, No. 51901195),国家科技攻关计划(No.2019ZX04007001)


Microstructure and Properties of Ti(C x ,N1- x )-based Cermets with Different C/N Ratios
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School of Mechanical Engineering, Sichuan University, Chengdu 610065, China

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National Natural Science Foundation of China (51634006, 51901195); Science and Technology Major Project of Sichuan Province (2020ZDZX0022); SCU-Pan Zhi Hua Project (2018CDPZH-25); SCU-Zi Gong Project (2019CDZG-1); National Science and Technology Major Project of China (2019ZX04007001)

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    摘要:

    Ti(Cx,N1-x)基金属陶瓷是用不同碳氮比制造的。研究了碳/氮比对芯-环结构和金属陶瓷性能的影响。结果表明,由于孔太多, Ti(C0.5,N0.5)基金属陶瓷的性能较差。随着碳/氮比的增加,白核/灰环的形成率降低,并且微观结构的均匀性增强。因此,基于 Ti(C0.7,N0.3)的金属陶瓷显示出优异的力学性能,但有少量的孔隙和较低的相对密度。与Ti(C0.7,N0.3)基金属陶瓷相比,TiC基金属陶瓷在没有N元素的情况下具有较高的相对密度且无孔隙,但其晶粒较粗大。为了获得细晶粒和高密度的显微组织,将0.25%Cr3C2-0.75%VC(质量分数)引入到TiC基金属陶瓷中,获得了优异的硬度、横向断裂强度和韧性。另外,在Ti(C0.7,N0.3)基金属陶瓷中也添加了0.25%Cr3C2-0.75%VC,但其力学性能低于Ti(C0.7,N0.3)的金属陶瓷,这是因为细颗粒和反应颗粒与Ti(C,N)发生了急性固溶反应。研究了基于不同C/N比的Ti(Cx,N1-x)基金属陶瓷的切削性能和摩擦性能。结果表明,具有0.25%Cr2C3-0.75%VC的TiC基金属陶瓷在室温下的摩擦系数最低,为0.15,在1000 r/min的高速切削过程中,使用寿命最长。

    Abstract:

    Ti(Cx,N1-x)-based cermets are fabricated with different ratios of carbon to nitrogen. The effect of C/N ratio on the core-rim structures and properties of cermets was studied. The results indicate that Ti(C0.5,N0.5)-based cermets possess poor properties due to too many pores. With the increase of C/N ratio, the formation rate of white-core/gray-rims decreases, and the homogeneity of the microstructure is enhanced. Consequently, the Ti(C0.7,N0.3)-based cermets show excellent mechanical properties, but a spot of voids and low relative density. TiC-based cermets with excellent relative density and non-porosity can be achieved in the absence of N element, which have coarser grain compared with Ti(C0.7,N0.3)-based cermets. In order to achieve fine grains and high density microstructure, 0.25wt%Cr3C2-0.75wt%VC is introduced into the TiC-based cermets. Superior hardness, transverse rupture strength and toughness are achieved. In addition, 0.25wt%Cr3C2-0.75wt%VC is also added into the Ti(C0.7,N0.3)-based cermets, but its mechanical properties are lower than that of the Ti(C0.7,N0.3)-based cermets without 0.25wt%Cr3C2-0.75wt%VC addition, which is due to acute solid solution reaction of finer and reactive particles with Ti(C,N). The cutting and friction performances of Ti(Cx,N1-x)-based cermets with different C/N ratios were also investigated. The results show that the TiC-based cermets with 0.25wt%Cr3C2-0.75wt%VC exhibit the lowest coefficient of friction which is 0.15 at the room temperature, and the longest service life during high speed cutting at 1000 r/min.

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杨露,熊计,郭智兴,刘俊波,苟青山,李相荣.不同碳/氮比的Ti(C x , N1- x )基金属陶瓷的显微组织与性能[J].稀有金属材料与工程,2021,50(12):4272~4281.[Yang Lu, Xiong Ji, Guo Zhixing, Liu Junbo, Gou Qingshan, Li Xiangrong. Microstructure and Properties of Ti(C x ,N1- x )-based Cermets with Different C/N Ratios[J]. Rare Metal Materials and Engineering,2021,50(12):4272~4281.]
DOI:10.12442/j. issn.1002-185X. E20200048

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  • 收稿日期:2020-10-01
  • 最后修改日期:2021-11-23
  • 录用日期:2020-12-10
  • 在线发布日期: 2021-12-30
  • 出版日期: 2021-12-24