静电纺丝技术制备锆基非氧化物陶瓷纳米纤维
详细信息 查看官网全文
- 英文论文题名：Preparation of Zirconium-Based Non-Oxide Ceramic Nanofibers by Electrospinning
- 论文作者：李飞 ; 黄晓
- 英文论文作者：Fei Li ; Xiao Huang ; Shanghai Institute of Ceramics ; Chinese Academy of Sciences
- 年：2016
- 作者机构：中国科学院上海硅酸盐研究所;
- 论文关键词：超高温陶瓷 ; 碳化锆 ; 硼化锆 ; 纳米纤维
- 会议召开时间：2016-11-18
- 会议录名称：中国第四届静电纺丝大会（CICE 2016）摘要集
- 语种：中文
- 分类号：TQ343.41
- 学会代码：ZGNM
- 会议名称：中国第四届静电纺丝大会(CICE 2016)
- 会议地点：中国北京
- 主办单位：中国复合材料学会超细纤维材料分会（筹）
- 学会名称：中关村科创纳米技术创新研究会
- 页数：1
- 文件大小：546k
- 原文格式：D
- 会议级别：全国
摘要
碳化锆(Zr C)、硼化锆(Zr B2)具有极高的熔点、硬度及较好的高温稳定性和高温力学性能,是重要的超高温陶瓷材料,被认为是在超高温条件下,如超高胜诉飞行器鼻锥、机翼前缘、火箭推进系统等极端环境中所需的最具潜力的候选材料。将Zr C、Zr B_2材料制成纤维,有望获得能够在超高温条件下使用的新型陶瓷纤维。同时,采用Zr C纤维、Zr B_2纤维作为增强体制备超高温陶瓷基复合材料,有望大幅度提高超高温陶瓷材料的力学性能并改善其脆性。本工作中,使用静电纺丝技术制备Zr C、Zr B_2陶瓷纳米纤维。使用聚乙酰丙酮锆作为锆源、蔗糖作为碳源、聚丙烯腈作为碳源和纺丝助剂,经过电纺得到Zr C纳米纤维的前驱体,在1400oC热处理发生碳热还原反应(Zr O_2+3C→Zr C+2CO)转变为Zr C纳米纤维。在上述体系中引入硼酸作为硼源,经静电纺丝技术可以得到Zr B_2的前驱纤维,在1500oC热处理发生碳热还原反应(Zr O_2+B_2O_3+5C→Zr B_2+5CO)转变为Zr B_2纳米纤维。制备的纳米纤维由Zr C、Zr B_2的纳米晶组成,纳米纤维的平均直径为250 nm。
Zirconium carbide(Zr C) and zirconium diboride(Zr B2) are typical members of so-called ultra high temperature ceramics(UHTCs) family. They are considered as most potential candidates for high temperature applications in hyoersonic aerospace vehicles and rocket propulsion systerms due to their extremely high melting point, high hardness, low volatilities, superior thermal shock resistance and excellent solid-phase stability. They can be synthesized by carbothermal reduction reactions: Zr O_2+3C→Zr C+2CO and Zr O_2+B_2O_3+5C→Zr B_2+5CO. Here, we report the preparation of Zr C and Zr B2 nanofibers in similar strategies by electrospinning technique. Polyzirconoxane(PZO) was used as zirconium precursor while polyacrylonitrile(PAN) used as spinning aid and carbon source. By pyrolysing the precursor nanofibers at 1400 oC for 2 hours under argon atmosphere, Zr C nanofibers were obtained. When boric acid was introduced into PZO/PAN system mentioned above, Zr B_2 ceramic nanofibers can be obtained after heat treatment at 1500oC for an hour under argon atmosphere. The obtained Zr C and Zr B_2 nanofibers are near stoichiometric.
Zirconium carbide(Zr C) and zirconium diboride(Zr B2) are typical members of so-called ultra high temperature ceramics(UHTCs) family. They are considered as most potential candidates for high temperature applications in hyoersonic aerospace vehicles and rocket propulsion systerms due to their extremely high melting point, high hardness, low volatilities, superior thermal shock resistance and excellent solid-phase stability. They can be synthesized by carbothermal reduction reactions: Zr O_2+3C→Zr C+2CO and Zr O_2+B_2O_3+5C→Zr B_2+5CO. Here, we report the preparation of Zr C and Zr B2 nanofibers in similar strategies by electrospinning technique. Polyzirconoxane(PZO) was used as zirconium precursor while polyacrylonitrile(PAN) used as spinning aid and carbon source. By pyrolysing the precursor nanofibers at 1400 oC for 2 hours under argon atmosphere, Zr C nanofibers were obtained. When boric acid was introduced into PZO/PAN system mentioned above, Zr B_2 ceramic nanofibers can be obtained after heat treatment at 1500oC for an hour under argon atmosphere. The obtained Zr C and Zr B_2 nanofibers are near stoichiometric.
引文
[1]Li,F.;Kang,Z.;Huang,X.;et al.Chem.Eng.J.2013,234:184.
[2]Li,F.;Kang,Z.;Huang,X.;et al.Ceram.Int.2014,40:10137.
[2]Li,F.;Kang,Z.;Huang,X.;et al.Ceram.Int.2014,40:10137.