-
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 17ions/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.
-
关键词:
- TiB2-SiC-Ti材料/
- 离子辐照/
- 高温氧化/
- 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 2material 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 2is difficult to sinter and process into other products. Therefore, adding ceramic and metal additives to TiB 2matrix 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 2composite. The TiB 2and 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 17ions/cm 2at 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 low Ti content possess better crystal structure and weaker irradiation hardening. In conclusion, the TiB 2-SiC-Ti material with 3% Ti mass fraction exhibits lower density, poorer wear resistance and lower hardness, while the material with lower Ti mass fraction is more resistant to irradiation than the material with 6% Ti mass fraction at room temperature.[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [30] [31] [32] [33] [34] [35] [36] [37] [38] [39] [40] [41] [42] [43] [44] [45] [46] [47] [48] [49] [50] [51] [52] [53] [54] [55] [56] -
物质 峰的位置/cm–1 振动模式 TiB2 275, 418 声子振动 TiO2 227 二阶散射峰 446 平面外振动 610 Ti-O拉伸振动 SiO2 708 Si-O拉伸振动 SiC 794, 958 Si-C伸缩振动 C 1345, 1590 面内伸缩振动 材料 条件 有效
面积面积增
加率/%TiB2-SiC-Ti
(Ti的质量分数为3%)1500 ℃热处理 35209 442 辐照后1500 ℃退火 190919 TiB2-SiC-Ti
(Ti的质量分数为6%)1500 ℃热处理 48570 131 辐照后1500 ℃退火 112214 晶面指数 (001) (100) (101) (002) (201) (112) TiB2-SiC-Ti
(Ti的质量分数为3%)峰高 696 1624 2708 244 280 240 半高宽 0.163 0.244 0.211 0.287 0.332 0.342 TiB2-SiC-Ti
(Ti的质量分数为6%)峰高 715 1623 2870 295 290 266 半高宽 0.159 0.210 0.211 0.251 0.315 0.334 样品 HV 误差 硬度变化/% TiB2-SiC-Ti
(Ti的质量分数为3%)290.104 ± 0.03 6.9 TiB2-SiC-Ti
(Ti的质量分数为3%) (辐照)311.489 ± 1.22 TiB2-SiC-Ti
(Ti的质量分数为6%)344.824 ± 17.80 9.2 TiB2-SiC-Ti
(Ti的质量分数为6%) (辐照)379.775 ± 0.62 -
[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [30] [31] [32] [33] [34] [35] [36] [37] [38] [39] [40] [41] [42] [43] [44] [45] [46] [47] [48] [49] [50] [51] [52] [53] [54] [55] [56]
计量
- 文章访问数:3961
- PDF下载量:61
- 被引次数:0