以TiC0.4为空位源制备高熵陶瓷硬质材料

Preparation of high entropy ceramic hard material with TiC0.4 as vacancy source

采用机械合金化法(MA)合成了具有面心立方结构,高浓度C空位缺陷的非化学计量比TiC0.4,以TiC0.4为主体,通过添加过渡金属碳(氮)化物,利用SPS烧结技术在高温条件下烧结制备了高熵陶瓷,应用X射线衍射仪(XRD)、场发射扫描电镜(SEM)、能谱分析(EDS)等方法,研究了不同组元高熵陶瓷的物相、显微结构、元素分布、相对密度和力学性能。研究表明在1600℃高温烧结条件下,不同组元高熵陶瓷的相对密度变化不大,硬度、断裂韧性随新组元NbC、TaC的加入逐渐增大,其中五组元高熵陶瓷维氏硬度达到25.2 GPa,其断裂韧性达到8.2 MPa·m^1/2。

A non-stoichiometric ratio TiC0.4 with a face-centered cubic structure and a high concentration of C vacancy defects was synthesized by mechanical alloying(MA).Then,high-entropy ceramics were prepared by SPS sintering technology on high temperature conditions with using TiC0.4 as the main component and adding transition metal carbon(nitrogen).X-ray diffraction(XRD),field emission scanning electron microscopy(SEM)and energy spectrum analysis(EDS)were used to study the Phase,microstructure,elemental distribution,relative density,and mechanical properties of high-entropy ceramics of different components.The results showed that the relative density of high-entrop ceramics of different components did not change much on the high temperature sintering condition of 1600℃.The hardness and fracture toughness increased with the addition of new components NbC and TaC.the Vickers hardness and fracture toughness of five-component high-entropy ceramics reached 25.2 GPa and 8.2 MPa·m^1/2 respectively.