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材料工程  2020, Vol. 48 Issue (5): 127-135    DOI: 10.11868/j.issn.1001-4381.2019.000195
  研究论文 本期目录 | 过刊浏览 | 高级检索 |
Ni-Cr-P焊膏钎焊C/C复合材料的组织和性能
易振华, 冉丽萍, 易茂中
中南大学 粉末冶金研究院 粉末冶金国家重点实验室, 长沙 410083
Microstructure and properties of C/C composites brazed with Ni-Cr-P pasty filler metal
YI Zhen-hua, RAN Li-ping, YI Mao-zhong
State Key Laboratory for Powder Metallurgy, Institute of Powder Metallurgy, Central South University, Changsha 410083, China
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摘要 用真空熔炼、惰性气体雾化法制备Ni-Cr-P金属粉末,再加入有机黏结剂高速搅拌,制备Ni14Cr10P膏状活性钎料。用制备好的焊膏真空钎焊C/C复合材料,测试钎焊接头的剪切强度,通过OM,SEM,EDS,XRD等对钎焊接头界面组织结构进行分析。结果表明:在钎焊温度1000℃、保温时间0.5 h条件下,获得的接头剪切强度达到28.6 MPa,然后随着钎焊温度上升或保温时间延长,钎焊接头强度下降;通过界面组织结构分析发现焊膏可以增加钎料层与C/C复合材料表面的接触面积,有利于堵塞C/C复合材料表面的孔隙。焊后在界面处形成了交错分布的Cr碳化物相缓冲层,使得界面呈现热膨胀系数梯度增加的结构,有助于缓解热失配,提高C/C复合材料钎焊接头强度。
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易振华
冉丽萍
易茂中
关键词 活性钎料焊膏C/C复合材料钎焊剪切强度界面组织结构    
Abstract:The Ni-Cr-P metal powder was prepared by vacuum melting and inert gas atomization method, and then an organic binder was added and stirred at high speed to prepare a Ni14Cr10P paste-like filler metal. The prepared pasty filler metal was used to braze the C/C composites in a vacuum furnace. Then the shear strength of the brazed joint was tested. The interface structure of the brazed joint was analyzed by OM, SEM, EDS and XRD. The results show that the shear strength of the joint obtained at the brazing temperature of 1000℃ and the holding time of 0.5 h reaches 28.6 MPa, and then the strength of the brazed joint is decreased with the increase of the brazing temperature or the holding time. It is found that the contact area between the brazing layer and the surface of the C/C composites is increased by the pasty brazing filler metal, which is favorable for blocking the pores on the surface of the C/C composites. A staggered distribution of Cr carbide phase buffer layer is formed at the interface, so that the interface exhibits a structure with an increased thermal expansion coefficient gradient, which helps to alleviate the thermal mismatch and improve the strength of the brazed joint.
Key wordsactive brazing filler    pasty filler    C/C composites brazing    shear strength    interface stru-cture
收稿日期: 2019-03-06      出版日期: 2020-05-28
中图分类号:  TG454  
通讯作者: 易茂中(1962-),男,教授,博导,研究方向为C/C复合材料、涂层材料等,联系地址:湖南省长沙市岳麓区麓山南路932号中南大学粉末冶金研究院(410083),E-mail:yimaozhong@126.com     E-mail: yimaozhong@126.com
引用本文:   
易振华, 冉丽萍, 易茂中. Ni-Cr-P焊膏钎焊C/C复合材料的组织和性能[J]. 材料工程, 2020, 48(5): 127-135.
YI Zhen-hua, RAN Li-ping, YI Mao-zhong. Microstructure and properties of C/C composites brazed with Ni-Cr-P pasty filler metal. Journal of Materials Engineering, 2020, 48(5): 127-135.
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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2019.000195      或      http://jme.biam.ac.cn/CN/Y2020/V48/I5/127
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