颗粒弥散和核-壳共存的TiCN基金属陶瓷的制备

宋金鹏; 高姣姣; 吕明

doi:10.13801/j.cnki.fhclxb.20200617.003

颗粒弥散和核-壳共存的TiCN基金属陶瓷的制备

doi: 10.13801/j.cnki.fhclxb.20200617.003

太原理工大学　机械与运载工程学院及精密加工山西省重点实验室，太原 030024

基金项目: 国家自然科学基金 (51875388；51405326)

详细信息

通讯作者:
宋金鹏，博士，副教授，硕士生导师，研究方向为高效加工及数控刀具(包括材料)技术　E-mail：songjinpeng@tyut.edu.cn

中图分类号: TB333
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出版历程
- 收稿日期: 2020-04-13
- 录用日期: 2020-06-06
- 网络出版日期: 2020-06-17
- 刊出日期: 2020-10-15

Fabrication of TiCN-based cermet with a coexisted microstructure of particle dispersion and core-rim structure

College of Mechanical and Vehicle Engineering and Shanxi Key Laboratory of Precision Machining, Taiyuan University of Technology, Taiyuan 030024, China

摘要

摘要: 为了制备具有良好综合力学性能的TiCN基金属陶瓷，研究了烧结温度对TiCN-HfN陶瓷微观结构和力学性能的影响，构建了颗粒弥散和核-壳共存的微观结构模型，揭示了材料的致密化机制、增硬机制、增韧补强机制。结果表明：在1 500℃下所制备的TiCN-HfN材料具有颗粒弥散与核-壳共存的微观结构，其中弥散的颗粒为HfN，核为TiCN，壳主要为(Ti, Hf, Mo)CN固溶体；材料具有较好的性能，其相对密度为99.7%、硬度为20.6 GPa、抗弯强度为1 682.5 MPa、断裂韧度为8.5 MPa·m^1/2；其致密化机制主要为颗粒和金属液相填充到烧结颈实现致密化，增硬机制主要为致密化和颗粒钉扎强化增硬，增韧补强机制主要为颗粒弥散和颗粒钉扎增韧、骨架结构和颗粒钉扎增强。
- TiCN-HfN陶瓷 /
- 颗粒弥散 /
- 核-壳结构 /
- 力学性能 /
- 微观结构
Abstract: In order to fabricate the TiCN-based cermet with better comprehensive mechanical properties, the effects of the sintering temperature on hte microstructure and mechanical properties of TiCN-HfN cermet were investigated. And a model of a coexisted microstructure of particle dispersion and core-rim structure was built for this cermet. Meanwhile, the densification, hardened, toughened and strengthened mechanisms were disclosed. The results show that the TiCN-HfN cermet fabricated at 1 500℃ has this coexisted microstructure and better comprehensive mechanical properties. The dispersed particle is HfN, the core consists of TiCN, and the rim is mainly composed of (Ti,Hf,Mo)CN solid solution. The relative density, hardness, flexural strength and fracture toughness of this cermet are 99.7%, 20.6 GPa, 1 682.5 MPa, 8.5 MPa·m^1/2, respectively. This cermet completes densification by particles and metal liquid that filled in the sintering necks in the cermet. This cermet is hardened by its densification and particle pinning effect, and is toughened by particle dispersion and particle pinning effect, and is strengthened by the formed skeleton structure and particle pinning effect.
- TiCN-HfN cermet /
- particle dispersion /
- core-rim structure /
- mechanical properties /
- microstructure

HTML全文

图 1 TiCN-HfN-Ni-Mo金属陶瓷的XRD图谱

Figure 1. XRD patterns of TiCN-HfN-Ni-Mo cermets

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图 2 4种烧结温度下TiCN-HfN-Ni-Mo金属陶瓷的抛光面形貌

Figure 2. Polished surface morphologies of TiCN-HfN-Ni-Mo cermets at 4 sintering temperatures

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图 3 图2中A、B、C各点的EDS能谱

Figure 3. EDS spectra of point A, point B and point C in Fig.2

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图 4 4种烧结温度下TiCN-HfN-Ni-Mo金属陶瓷的断口形貌

Figure 4. Fracture morphologies of TiCN-HfN-Ni-Mo cermets at 4 sintering temperatures

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图 5 烧结温度与TiCN-HfN-Ni-Mo金属陶瓷力学性能间的关系

Figure 5. Relationship between sintering temperature and mechanical properties of TiCN-HfN-Ni-Mo cermets

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图 6 颗粒弥散与核-壳共存模型

Figure 6. A model of the coexistence microstructure of particle dispersion and core-rim structure

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