高级检索
无机材料学报

无机材料学报 >

2010 , Vol. 25 >Issue 4: 419 - 423

DOI: https://doi.org/10.3724/SP.J.1077.2010.00419

研究论文

原位热压合成高纯Cr2AlC块体材料及其腐蚀性能的研究

  • 宋京红 ,
  • 梅炳初 ,
  • 王敬平
展开
  • 武汉理工大学1. 材料研究与测试中心; 2. 材料复合新技术国家重点实验室, 武汉 430070

收稿日期: 2009-06-08

  修回日期: 2009-11-04

  网络出版日期: 2010-04-27

收起

In-situ Hot Pressing Synthesis and Corrosion Properties of High Pure Cr2AlC

  • SONG Jing-Hong ,
  • MEI Bing-Chu ,
  • WANG Jing-Ping
Expand
  • 1. The Center for Materials Research and Analysis, Wuhan University of Technology, Wuhan 430070, China; 2. State key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China

Received date: 2009-06-08

  Revised date: 2009-11-04

  Online published: 2010-04-27

Fold

摘要

采用原位热压烧结工艺, 以Cr3C2 、Cr和Al粉为原料制备Cr2AlC块体材料. 采用X射线和扫描电镜(SEM)对制备的样品进行表征. 利用差热法对反应过程进行了研究, 以失重法研究Cr2AlC在酸和碱溶液中的腐蚀性能. 结果表明, 以n(Cr3C2)∶n(Cr)∶n(Al)=0.5∶0.5∶1.2配比, 1350℃, 30MPa压力热压2h得到高纯Cr2AlC块体, 其合成过程首先为Al的溶化, 在700℃时Cr与Al生成Cr5Al8, 最后Cr5Al8与Cr3C2反应生成Cr2AlC. 样品断面的扫描照片显示, 烧结试样呈板状和片状结晶形貌特征, 平均粒径为6.4μm. 除在浓H2SO4和浓HCl中失重较大外, Cr2AlC在其它溶液中均表现较低的失重. 样品浸泡在浓和稀的NaOH溶液150d几乎没有质量损失, 腐蚀率仅为0.4和0.7μm/a.

关键词： 热压; 铬铝化碳; 腐蚀性能; 失重法

本文引用格式

宋京红 , 梅炳初 , 王敬平 . 原位热压合成高纯Cr2AlC块体材料及其腐蚀性能的研究[J]. 无机材料学报, 2010 , 25(4) : 419 -423 . DOI: 10.3724/SP.J.1077.2010.00419

Abstract

Cr2AlC bulk material was prepared insitu by hot pressing sintering using Cr3C2, Cr and Al as the starting materials. The samples were characterized using X-ray diffraction (XRD) and scanning electron microscope (SEM). The reaction process was investigated by means of differential scanning calorimetry (DSC). The corrosion properties of Cr2AlC in the acid and alkali solutions were obtained by weight loss method. The XRD result shows that high purity Cr2AlC bulk material can be synthesized by hot pressing with n(Cr3C2)∶n(Cr)∶n(Al)=0.5∶0.5∶1.2 at 1350℃ for 2h under 30MPa. The XRD patterns in different temperatures suggest that the reaction process of starting materials is that Al melts at first, then Cr5Al8 generates at 700℃, Cr2AlC is produced with the temperature elevation by the reaction of Cr5Al8 and Cr3C2 at last. SEM images of fracture faces of the sintered sample show the laminated and well plateshaped grains with a mean particale size of 6.4μm. Cr2AlC exhibits low weight loss except immersion in the concentrated H2SO4 and HCl solutions. The weight loss is negligible after immersing samples in the concentrated and dilute NaOH solutions for 150d and the corrosion rates are only 0.4 and 0.7μm/a, respectively.

Key words： hot pressing; Cr2AlC; corrosion properties; weight loss method

参考文献

［1］Barsoum M W. The MN+1AXN phases: A new class of solids; Thermodynamically stable nanolaminates. Progress in Solid State Chemistry, 2000, 28(1-4): 201-281.
［2］朱教群, 梅炳初, 陈艳林(ZHU Jiao-Qun, et al). 具有良好金属性能的层状三元碳化物和氮化物.中国有色金属学报(J. Nonferr. Metal Soc.), 2001, 11(S2): 29-32.
［3］Lin Zhijun, Li Meishuan, Wang Jingyang, et al. Microstructure and hightemperature corrosion behavior of a Cr-Al-C composite. J. Am. Cream. Soc., 2007, 90(12): 3930-3937.
［4］Lin Z J, Li M S, Wang J Y, et al. Hightemperature oxidation and hot corrosion of Cr2AlC. Acta Materialia, 2007, 55(6)： 6182-6191.
［5］Lin Z J, Zhou Y C, Li M S, et al. Insitu hot pressing/solidliquid reaction synthesis of bulk Cr2AlC. Zeitschrift Fur Metallkunde, 2005, 96(3): 291-296.
［6］Tian W B , Wang P L, Zhang G J, et al. Synthesis and thermal and electrical properties of bulk Cr2AlC. Scrip. Mater., 2006, 54(5): 841-846.
［7］Tian W B, Sun Z M, Du Y L, et al. Synthesis reactions of Cr2AlC from Cr-Al4C3-C by pulse discharge sintering. Materials Letters, 2008, 62(23): 3852-3855.
［8］Hong X L, Mei B C, Zhu J Q, et al. Fabrication of Ti2AlC by hot pressing of Ti, TiC,Al and active carbon powder mixtures. Journal of Materials Science, 2004, 39(5): 1589-1592.
［9］Zhou W B, Mei B C, Zhu J Q, et al. Fabrication of highpurity ternary carbide Ti3SiC2 by spark plasma sintering technique. Materials Letters, 2005, 59(1): 131-134.
［10］Zhu Jiaoqun, Mei Bingchu, Liu Jun, et al. Synthesis of highpurity Ti3SiC2 and Ti3AlC2 by hotpressing (HP). Journal of Materials Science, 2003, 22(7): 1111-1112.
［11］EL-Raghy S M, Waheed A F, EL-Raghy T S, et al. Preliminary Report on the Electrochemical Behavior of Ti3SiC2. Journal of Materials Science Letters, 1999, 18(7): 519-520.
［12］Jovic V D, Jovic B M, Gupta S, et al. Corrosion behavior of select MAX phases in NaOH, HCl and H2
SO4. Corrosion Science, 2006, 48(12): 4274-4282.
［13］Travaglini J, Barsoum M W, Jovic V D, et al. The corrosion behavior of Ti3SiC2 in common acids and dilute NaOH. Corrosion Science, 2003, 45(6): 1313-1327.
［14］王敬平, 梅炳初, 周卫兵, 等(WANG Jin-Ping, et al). 新型层状化合物Ti2AlC在酸性溶液中的腐蚀行为. 无机材料学报(Journal of Inorganic Materials), 2009, 24(24): 402-406.
Options
文章导航

/

〈 〉