TiC纳米线/Mo-Al<sub>2</sub>O<sub>3</sub>金属陶瓷的制备与电学性能

张昊; 张雪萍; 黄宗玥; 陈甜甜; 魏剑

doi:10.13801/j.cnki.fhclxb.20210601.002

TiC纳米线/Mo-Al₂O₃金属陶瓷的制备与电学性能

doi: 10.13801/j.cnki.fhclxb.20210601.002

西安建筑科技大学　材料科学与工程学院，西安 710055

基金项目: 国家自然科学基金面上项目(51578448；51308447)；陕西省自然科学基础研究计划重大基础研究项目(2017ZDJC-18)；留学人员科技活动择优资助项目(陕人社函 [2016]789号)；陕西省教育厅科学研究计划协同创新中心项目(20JY042)；陕西省教育厅科学自然科学专项项目(19JK0463)

详细信息

通讯作者:
魏剑，博士，教授，博士生导师，研究方向为导电/纳米纤维与膜材料　E-mail：weijian@xauat.edu.cn

中图分类号: TB333
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- 被引次数: 0
出版历程
- 收稿日期: 2021-04-12
- 修回日期: 2021-05-20
- 录用日期: 2021-05-26
- 网络出版日期: 2021-06-02
- 刊出日期: 2022-04-01

Preparation and electrical properties of TiC nanowires/Mo-Al₂O₃ cermet

School of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China

摘要

摘要: Mo-Al₂O₃金属陶瓷具有热震稳定性好、耐高温、低电阻等优点，已经作为特高压(UHVDC)运输过程中的核心部件。但由于电阻率可控性差、渗流阈值较高及机械强度低等缺点，严重制约了其在特高压运输中的广泛应用。采用碳化钛纳米线(TiC_NW)，制备了具有桥连结构的TiC_NW/Mo-Al₂O₃陶瓷复合材料。研究了TiC_NW、Mo与Al₂O₃之间构建的桥连结构，对金属陶瓷的电学性能和力学性能的影响规律，实现了陶瓷电阻率稳定的基础上的渗流阈值降低。当TiC_NW含量为13wt%时，Mo-Al₂O₃金属陶瓷的渗滤阈值降低到10wt%，当TiC_NW和Mo含量分别为8wt%和30wt%时，金属陶瓷弯曲强度和硬度可分别达到95 MPa和1283 kg/mm²，并观察到金属陶瓷桥联结构。研究结果对于制备高性能Mo-Al₂O₃金属陶瓷具有重要意义。
- TiC /
- 纳米线 /
- 陶瓷 /
- 渗流阈值 /
- 桥连结构
Abstract: Mo-Al₂O₃ cermet has the advantages of good thermal shock stability, high temperature resistance and low resistance, and has been used as the core component in the process of ultra high voltage direct current (UHVDC) transportation. However, due to the poor controllability of resistivity, high seepage threshold and low mechanical strength, its wide application in UHVDC transportation is seriously restricted. TiC_NW/Mo-Al₂O₃ ceramic composites with bridge structure were prepared by using titanium carbide nanowires (TiC_NW). The bridge structure constructed between TiC_NW, Mo and Al₂O₃ was studied, and the influence of the bridge structure on the electrical and mechanical properties of cermets was studied. The percolation threshold is reduced on the basis of stable resistivity of cermets. When the TiC_NW content is 13wt%, the percolation threshold of Mo-Al₂O₃ cermet is reduced to 10wt%. When the TiC_NW and Mo contents are 8wt% and 30wt%, respectively, the flexural strength and hardness of cermet can reach 95 MPa and 1283 kg/mm², respectively, and the cermet bridging structure is observed. The research results are of great significance for the preparation of high-performance Mo-Al₂O₃ cermets.
- TiC /
- nanowires /
- cermet /
- percolation threshold /
- bridge structure

HTML全文

图 1 静电纺丝法制备碳化钛纳米线(TiC_NW)的SEM图像 (a) 和XRD图谱 (b)

Figure 1. SEM image (a) and XRD pattarn (b) of titanium carbide nanowires (TiC_NW) prepared by electrospinning

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图 2 TiC_NW的拉曼光谱

Figure 2. Raman spectra of TiC_NW

I_D/I_G—Intensity ratio of peak D to peak G

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图 3 TiC_NW的XPS图谱：(a) 全谱图；(b) C1s；(c) Ti2p；(d) O1s

Figure 3. XPS spectra of TiC_NW: (a) Survey; (b) C1s; (c) Ti2p; (d) O1s

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图 4 TiC_NW/Mo-Al₂O₃陶瓷的SEM图像 ((a),(b))、XRD图谱 (c) 和桥连结构示意图 (d)

Figure 4. SEM images ((a),(b)) , XRD pattern (c) and bridging structure diagram (d) of TiC_NW/Mo-Al₂O₃ cermets

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图 5 Mo-Al₂O₃(a) 和TiC_NW/Mo-Al₂O₃(b) 陶瓷的电阻率

Figure 5. Resistivity of Mo-Al₂O₃ (a) and TiC_NW/Mo-Al₂O₃ cermets (b)

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图 6 TiC_NW/Mo-Al₂O₃陶瓷渗流阈值的实际值与理论值关系

Figure 6. Relationship between experimental date and theoretical date of TiC_NW/Mo-Al₂O₃ cermets percolation threshold

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图 7 TiC_NW/Mo-Al₂O₃陶瓷阻抗谱图

Figure 7. Impedance spectra of TiC_NW/Mo-Al₂O₃ cermets

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图 8 TiC_NW/Mo-Al₂O₃陶瓷的体积密度变化 (a) 和陶瓷气孔率变化 (b)

Figure 8. Volume density variation (a) and porosity variation (b) of TiC_NW / Mo-Al₂O₃ ceramics

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图 9 TiC_NW/Mo-Al₂O₃陶瓷弯曲强度变化 (a) 和BSE照片 (b)

Figure 9. Bending strength (a) and BSE photo (b) of TiC_NW/MO-Al₂O₃ cermets

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图 10 TiC_NW/Mo-Al₂O₃陶瓷硬度的变化

Figure 10. Microhardness changes of TiC_NW/Mo-Al₂O₃ cermets

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