Mechanisms and mechanical properties of high-temperature high-pressure sintered vanadium carbide ceramics

材料科学 陶瓷 烧结 碳化钒 相对密度 缩进 维氏硬度试验 复合材料 碳化物 粒度 模数 高压 弹性模量 冶金 微观结构 热力学 物理
作者
Jie Chen,Fang Peng,Yipeng Wang,Ruiqi He,Zhengang Zhang,Wenjia Liang,Haidong Long,Peihong He,Hao Liang
出处
期刊:International Journal of Refractory Metals & Hard Materials [Elsevier BV]
卷期号:118: 106483-106483 被引量:4
标识
DOI:10.1016/j.ijrmhm.2023.106483
摘要

Vanadium carbide (VC) is extensively employed as a reinforcing agent in coating materials and a grain refiner in hard alloys, owing to its exceptional mechanical properties. A series of bulk VC ceramics were fabricated via high-temperature high-pressure sintering, followed by a comprehensive and systematic investigation of various properties of the sintered samples. The results revealed significant influences of processing temperature on the properties of sintered VC at 5.0 GPa. However, the exact nature of temperature dependence varied depending on the specific property. It was found that VC ceramics sintered at 1100 °C and 5.0 GPa exhibited the best overall performance, providing a relatively optimal temperature condition for synthesis. The Vickers hardness of the material reached an astonishing 43.2 GPa under a 9.8 N load, placing it within the category of superhard materials. However, the sintered sample exhibited a gradually lower hardness value of 30.4 GPa under a higher load of 29.4 N. Highly dense with a relative density of 99.8%, exhibiting near full density, the vanadium carbide ceramics possess an impressive Young's modulus of 544 GPa, indentation fracture resistance of 5.4 MPa m1/2, and an oxidation initiation temperature of 758 °C. This study offers practical guidance for the design of novel transition metal carbide superhard materials and provides valuable insights for the exploration of visualizing directions in the next generation of superhard materials.
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