C空位诱导扩散型高熵陶瓷硬质材料的合成  

Synthesis of High-Entropy Ceramic Hard Materials with C-Vacancy-Induced Diffusion

作　　者：刘兵赛 陈川 吴一[1] 莫培程 LIU Bingsai;CHEN Chuan;WU Yi;MO Peicheng(Guilin University of Technology, Guilin, Guangxi 541004,China;China Nonferrous Metals (Guilin) Geology and Mining Co,.Ltd, Guilin, Guangxi 541004,China)

机构地区：[1]桂林理工大学,广西桂林541004 [2]中国有色桂林矿产地质研究院,广西桂林541004

出　　处：《超硬材料工程》2020年第5期30-38,共9页Superhard Material Engineering

基　　金：广西创新驱动发展专项资金项目(AA17204098)。

摘　　要：实验采用机械合金化法(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TiC0.5,以TiC0.5为主体,在空位扩散的辅助作用下,利用SPS烧结技术成功烧结制备了空位诱导扩散型高熵陶瓷。研究表明三种组元高熵陶瓷在1600℃烧结温度下均能获得单一的高熵陶瓷物相,陶瓷体内单个晶粒中金属原子分布均匀,而使用TiC替代TiC0.5的对比实验在相同条件下均没有获得想要的单一物相,且烧结体内单个晶粒中存在金属原子偏聚的现象。高熵陶瓷原子密排面不平坦的特性对其断裂韧性改善较大,且不损失材料硬度,其中五组元高熵陶瓷在1800℃条件下,断裂韧性达到7.74 MPa·m^1/2,硬度为23.4 GPa。The mechanical alloying method(MA)was used to synthesize a non-stoichiometric ratio TiC0.5 of a face-centered cubic structure and a high concentration of C vacancy defects.Then,with SPS sintering technology and the vacancy diffusion supporting,vacancy induced diffusion type high-entropy ceramics of which the main body is TiC0.5 were successfully sintered.The research showed that high-entropy ceramics of different components presented a single high-entropy ceramic phase at a sintering temperature of 1600℃,andthe metal atoms in a single grain of the ceramic body were evenly distributed.But the comparative experiment in which TiC0.5 was replaced by TiC did not obtain the desired single phase under the same conditions,and a phenomenon of segregation of metal atoms in the individual grains of sintered body appeared.The unevenness of the atomic closed-packing face in high-entropy ceramics greatly improved its fracture toughness with no loss in material hardness.Among them,the five-component high-entropy ceramics had a fracture toughness of 7.74 MPa·m^1/2 and a hardness of 23.4 GPa at 1800℃.

关 键 词：高熵陶瓷 TiC0.5 SPS 力学性能 空位扩散 

分 类 号：TQ127[化学工程—无机化工]