Ti含量对TiB_(2)-SiC-Ti材料制备和性能的影响  

Effect of Ti content on preparation and properties of TiB_(2)-SiC-Ti materials

作　　者：何晓珣 李炳生 刘瑞[2] 张桐民 曹兴忠[4] 陈黎明 徐帅 He Xiao-Xun;Li Bing-Sheng;Liu Rui;Zhang Tong-Min;Cao Xing-Zhong;Chen Li-Ming;Xu Shuai(State Key Laboratory of Environment-Friendly Energy Materials,Southwest University of Science and Technology,Mianyang 621010,China;Institute of Solid State Physics,Chinese Academy of Sciences,Hefei 230000,China;Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China;Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;School of Materials Science and Engineering,Southwest University of Science and Technology,Mianyang 621010,China)

机构地区：[1]西南科技大学,环境友好能源材料国家重点实验室,绵阳621010 [2]中国科学院合肥固体物理研究所,合肥230000 [3]中国科学院近代物理研究所,兰州730000 [4]中国科学院高能物理研究所,北京100049 [5]西南科技大学,材料与化学学院,绵阳621010

出　　处：《物理学报》2022年第19期53-64,共12页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:12075194)资助的课题。

摘　　要：TiB_(2)材料由于高熔点和低原子序数成为新一代核反应堆等离子体壁材料的候选者之一.然而,单一TiB_(2)材料难以制备和加工,因此在TiB_(2)中加入助烧剂来优化其性能具有重要的应用价值.本论文利用放电等离子体烧结得到Ti质量分数分别为3%和6%的两种TiB_(2)-SiC-Ti材料.材料在室温条件下进行能量60 keV,离子注量为2×10^(17)ions/cm^(2)的He+辐照,辐照前后材料都进行1500℃热处理.利用能量色散光谱、拉曼光谱、掠角X射线衍射光谱、维氏硬度、划痕深度和宽度分布、扫描电子显微镜等手段表征材料在制备态、辐照后和退火下的微观结构及宏观性能.结果显示,TiB_(2)-SiC-Ti(Ti的质量分数为3%)材料本身致密性低、耐磨性差、硬度低且抗氧化性弱.但与TiB_(2)-SiC-Ti(Ti的质量分数为6%)材料相比,TiB_(2)-SiC-Ti(Ti的质量分数为3%)材料更抗辐照;论文对该实验结果进行讨论,认为在3%-6%质量分数范围内,增加Ti含量有助于提升TiB_(2)-SiC-Ti材料致密性和力学性能.Since the 21st century,low atomic number material coating has been considered as one of methods for treating the first wall of controllable thermonuclear fusion device.The TiB_(2)material with high melting point,high hardness,low coefficient of thermal expansion,excellent wear resistance and low atomic number has entered into people’s field of vision.Single TiB_(2)is difficult to sinter and process into other products.Therefore,adding ceramic and metal additives to TiB_(2)matrix material to effectively improve the mechanical properties and processability of the material has become a research hotspot.On the basis of the existing researches of TiB_(2)-SiC,in the present work the metal Ti powder is added as the second additive to improve the properties of TiB_(2)composite.The TiB_(2)and SiC are mixed at a mass ratio of 2 to 3,then two kinds of TiB_(2)-SiC-Ti materials with different amounts of Ti content are prepared by spark plasma sintering(SPS)technology.The materials are irradiated by a He+beam with energy of 60 keV and ion fluence of 2×10^(17)ions/cm^(2)at room temperature.The material is heat-treated at 1500℃before and also after irradiation.The performances of prepared samples,the effect of irradiation on materials and the results of high temperature heat treatment are characterized by energy dispersive spectroscopy,Raman spectrum,grazing angle x-ray diffraction spectrum,Vickers hardness,wear resistance test,and scanning electron microscope.The results show that the surface morphology and toughness of TiB_(2)-SiC-Ti material with 3%Ti mass fraction are poor as shown in SEM images.The wear resistance test indicates that the material surface is seriously worn and the wear resistance is poor.The X-ray diffraction spectrum and Raman spectra show that the material is oxidized seriously at 1500℃,which is likely to be the cause of the poor compactness of materials.Raman spectra,Grazing angle X-ray diffraction spectrum and some Vickers hardness data before and after irradiation indicate that the material with

关 键 词：TiB_(2)-SiC-Ti材料 离子辐照 高温氧化 力学性能 

分 类 号：TL612[核科学技术—核技术及应用]