航空学报 > 1997, Vol. 18 Issue (6): 747-751

XD 法原位合成 NiAl 基复合材料反应机制的研究

鲁玉祥1, 杨德庄1, 陶春虎2, 陈琳2, 谢明立2   

  1. 1. 哈尔滨工业大学, 哈尔滨, 150001;2. 北京航空材料研究院, 北京, 100095
  • 收稿日期:1996-12-05 修回日期:1997-03-15 出版日期:1997-12-25 发布日期:1997-12-25

STUDY ON REACTIVE MECHANISM OF XD METHOD FOR SYNTHESIZING NiAl MATRIX IN SITU COMPOSITES

Lu Yuxiang1, Yang Dezhuang1, Tao Chunhu2, Chen Lin2, Xie Mingli2   

  1. 1. Harbin Institute of Technology, Harbin, 150001;2. Beijing Institute of Aeronautical Materials, Beijing, 100095
  • Received:1996-12-05 Revised:1997-03-15 Online:1997-12-25 Published:1997-12-25

摘要:

用差热分析(DTA)、X射线(XRD)、扫描电镜(SEM)等技术研究了NiAl金属间化合物基复合材料(IMCs)的合成机理。结果表明,XD反应是许多局部自蔓燃高温合成(SHS)过程产生的燃烧波的叠加,加热过程中高能态[Ni],[Al]间的固态反应所放出的热充当了各个(SHS)过程的点火源。粉坯密度是决定XD反应机制的重要因素,因为孔隙对SHS过程中燃烧波的点燃和自蔓延起阻碍作用。

关键词: NiAl基复合材料, XD法, 反应机制

Abstract:

The reactive mechanism of XD method for synthesizing a NiAl matrix composite has been studied by means of DTA, XRD and SEM. Results show that the reactive mechanism is an overlap of combustion waves produced by SHS reactions which are ignited by exothermic reactions between and in the high energy state. The density is one of the important factors which determine the reactive mechanism because the contact porosity may obstruct ignition and propagation of the combustion wave.

Key words: NiAl matrix composite, XD method, reactive mechanism

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