PTFE促发TiB2-TiC复合粉体低温燃烧合成
Low Temperature Combustion Synthesis of TiB2-TiC Composite Powders Induced by PTFE
摘 要
在钛-硼体系中引入PTFE(聚四氟乙烯)作为反应促进剂, 实现了TiB2-TiC复合陶瓷粉体的低温固相合成, 并研究了PTFE加入量对反应过程的影响和反应机理。结果表明: 当PTFE加入量少于5%(质量分数)时, 产物中主要为未反应的钛, 达到5%后可生成TiC相; 当添加10%PTFE时, 能够在550 ℃燃烧合成制备出平均粒径小于0.4 μm、纯度很高的TiB2-TiC复合粉体; 其反应机理为, 首先PTFE与钛发生反应释放出大量的热, 然后诱发钛与硼发生固相反应生成TiB2。
燃烧合成
TiB2-TiC复合陶瓷
PTFE (polytetrafluoroethylene)
combustion synthesis
TiB2-TiC composite ceramic
Abstract
TiB2-TiC composite powders were prepared at low temperature in the Ti-B system with PTFE (polytetrafluoroethylene) as a chemical activator. The effects of PTFE addition on reaction process and reaction mechanism were investigated. The results show that there was only unreacted titanium in the product when the addition of PTFE was less than 5wt.%; when the addition of PTFE was 5wt.%, TiC phase could be observed in the product, but the energy released from the reaction between titanium and PTFE was not enough to induce the reaction between titanium and boron; when adding 10wt.% PTFE was added, TiB2-TiC composite powders, which were less than 0.4 μm in average particle size and had high purity, could be synthesized via low-temperature combustion synthesis at 550 ℃. The reaction mechanism could be described as following: titanium reacts with PTFE at first, resulting in large amounts of heat released; subsequently, the released heat induces the combustion reaction between titanium and boron particles to form TiB2.
中图分类号 TQ174 DOI 10.11973/jxgccl201509005
所属栏目 试验研究
基金项目 中央高校基本科研业务费项目(NP2012303)
收稿日期 2013/12/13
修改稿日期 2015/5/26
网络出版日期
作者单位点击查看
备注廖秋平(1989-),男,江西赣州人,硕士研究生。
引用该论文: LIAO Qiu-ping,WANG Tao,YU Yin-hu,ZHANG Hong-min. Low Temperature Combustion Synthesis of TiB2-TiC Composite Powders Induced by PTFE[J]. Materials for mechancial engineering, 2015, 39(9): 22～24
廖秋平,汪涛南京航空航天大学材料科学与技术学院, 南京 211106,鱼银虎,张洪敏. PTFE促发TiB2-TiC复合粉体低温燃烧合成[J]. 机械工程材料, 2015, 39(9): 22～24
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参考文献
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【4】ANDREEV Y, LEVASHOV E A, SHEVEIKO A. Electrochemical corrosion behavior of SHS-synthesized magnetron composite TiC-based targets and sputtered thin films [J]. Surf Coat Technol, 1997, 90(1): 42-52.
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【6】GUTMANAS E Y, GOTMAN I. Dense high-temperature ceramics by thermal explosion under pressure [J]. J Eur Ceram Soc, 1999, 19(13): 2381-2393.
【7】BARSOUM M W, HOUNG B. Transient plastic phase processing of titanium-boron-carbon composites [J]. J Am Ceram Soc, 1993, 76(6): 1445-1451.
【8】SONG I, WANG L, WIXOM M, et al. Self-propagating high temperature synthesis and dynamic compaction of titanium diboride/titanium carbide composites [J]. J Mater Sci, 2000, 35(10): 2611-2617.
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【10】李建林, 曹广义, 周勇, 等. 高能球磨制备TiB2-TiC纳米复合粉体[J]. 无机材料学报, 2001, 16(4): 709-714.
【11】HAMBARTSUMYAN A A, KHACHATRYAN H L, KHARATYAN S L. Mechanically and chemically activated SHS in the Mo-Si-C system: synthesis of MoSi2-SiC composites [J]. Inter J SHS, 2007, 16(2): 87-91.
【12】ZURNACHYAN A R, KHARATYAN S L, KHACHATRYAN H L, et al. Self-propagating high temperature synthesis of SiC-Cu and SiC-Al cermets: Role of chemical activation [J]. Inter J Refract Met Hard Mat, 2011, 29(2): 250-255.
【13】LEE I, REED R R, BRADY V L, et al. Energy release in the reaction of metal powders with fluorine containing polymers [J]. Therm Anal Calorim, 1997, 49(3): 1699-1705.
【14】KUWAHARA T, MATSUO S, SHINOZAKI N. Combustion and sensitivity characteristics of Mg/TF pyrolants [J]. Propell Explos Pyrotech, 1997, 22(4): 198-202.
【15】BARIN I. Thermochemical data of pure substances [M]. Weinheim: VCH, 1995.
【16】KOCH E C. Metal-fluorocarbon based energetic materials [M]. Weinheim: John Wiley & Sons, 2012.
【17】殷声. 燃烧合成 [M]. 北京: 冶金工业出版社, 1999.
【18】FU Z Y, WANG H, WANG W M, et al. Composites fabricated by self-propagating high-temperature synthesis[J]. J Mater Process Technol, 2003, 137(1): 30-34.
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