铌对钛（C，N）基金属陶瓷微观结构和摩擦学特性的影响

IF 4.2 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials Pub Date : 2024-11-10 DOI:10.1016/j.ijrmhm.2024.106958

Meiling Liu , Yajing Cao , Jiaying Feng , Wanxiu Hai , Yuhong Chen , Chengshang Zhou

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引用次数: 0

摘要

利用（Ti,W0.15,NbX）C 预固溶体粉末通过无压真空烧结制备了钛（C,N）基金属陶瓷，并研究了 Nb 摩尔比对微观结构、芯/圈界面、力学和摩擦学性能的影响。结果表明，铌含量的增加会导致金属陶瓷发生明显的微观结构变化。灰芯/Gy 边缘和白芯/Gy 边缘的微观结构提高了力学性能，而无边缘的黑色晶粒和灰芯/黑色边缘则具有削弱作用。含（Ti,W0.15,Nb0.01）C 的金属陶瓷的维氏硬度为 1664 兆帕，断裂韧性为 10.3 兆帕-m1/2，横向断裂强度为 1204 兆帕。室温下的平均摩擦系数和体积磨损比分别为 0.46 和 2.49E-8 mm3*N-1*m-1，主要机理为粘着磨损。在 600 °C 时，平均摩擦系数和体积磨损比分别为 0.37 和 1.15E-6 mm3*N-1*m-1，三氧化反应是主要的磨损机制。

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Effect of Nb on microstructure and tribological properties of Ti(C, N)-based cermet

The Ti(C,N)-based cermet were prepared by pressureless vacuum sintering using (Ti,W_0.15,Nb_X)C pre-solid solution powder, and the effect of Nb molar ratio on microstructure, core/rim interface, mechanical and tribological properties were investigated. The results showed that increasing of Nb content led to distinct microstructural changes in the cermets. The gray core/Gy rim and white core/Gy rim microstructure enhanced mechanical properties, while the rimless black grains and gray core/black rim had a weakening effect. The cermet with (Ti,W_0.15,Nb_0.01)C had a Vickers hardness of 1664 MPa, fracture toughness of 10.3 MPa·m^1/2 and transverse rupture strength of 1204 MPa. The average friction coefficient and the volume wear ratio at room temperature were 0.46 and 2.49E-8 mm³*N⁻¹*m⁻¹, respectively, with adhesive wear as the primary mechanism. At 600 °C, the average friction coefficient and the volume wear ratio were 0.37 and 1.15E-6 mm³*N⁻¹*m⁻¹, respectively, with tribo-oxidation being the dominant wear mechanism.

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来源期刊

$International Journal of Refractory Metals & Hard Materials$

International Journal of Refractory Metals & Hard Materials 工程技术-材料科学：综合

CiteScore

7.00

自引率

13.90%

发文量

236

审稿时长

35 days

期刊介绍： The International Journal of Refractory Metals and Hard Materials (IJRMHM) publishes original research articles concerned with all aspects of refractory metals and hard materials. Refractory metals are defined as metals with melting points higher than 1800 °C. These are tungsten, molybdenum, chromium, tantalum, niobium, hafnium, and rhenium, as well as many compounds and alloys based thereupon. Hard materials that are included in the scope of this journal are defined as materials with hardness values higher than 1000 kg/mm2, primarily intended for applications as manufacturing tools or wear resistant components in mechanical systems. Thus they encompass carbides, nitrides and borides of metals, and related compounds. A special focus of this journal is put on the family of hardmetals, which is also known as cemented tungsten carbide, and cermets which are based on titanium carbide and carbonitrides with or without a metal binder. Ceramics and superhard materials including diamond and cubic boron nitride may also be accepted provided the subject material is presented as hard materials as defined above.