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无机材料学报

• 研究论文 • 上一篇    下一篇

Mo添加对Ni3Al-TiC润湿特性的影响机制研究

沈强; 张联盟; 涂溶   

  1. 武汉理工大学材料复合新技术国家重点实验室 武汉 430070
  • 收稿日期:2001-09-27 修回日期:2001-12-25 出版日期:2002-11-20 网络出版日期:2002-11-20

Effect of Mo Addition on the Wettability between Ni3Al and TiC

SHEN Qiang; ZHANG Lian-Meng; TU Rong   

  1. State Key Lab of Advanced Technology for Materials Synthesis and Processing; Wuhan University of Technology; Wuhan 430070; China
  • Received:2001-09-27 Revised:2001-12-25 Published:2002-11-20 Online:2002-11-20

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摘要： 采用2AP-LEITZ高温显微镜对TiC-Ni3Al的润湿接触角进行了实验测定,着重探讨了Ni3Al对TiC的润湿特性以及Ni3Al中添加少量Mo的影响机制.结果表明,TiC与Ni3Al之间具有良好的润湿性能.5wt％Mo的添加使Ni3Al向TiC基板浸渗的深度增大,并与TiC颗粒发生固溶反应置换出部分Ti,在其周围形成一个含Mo的壳层.在这个壳层里,Ti、Mo进一步与Ni3Al固溶,这些反应降低了液-固表面张力,导致了润湿接触角的下降,从而改善了TiC-Ni3Al的润湿性.

关键词: Ni3Al-TiC, Mo, 润湿特性, 影响机制

Abstract: The wetting angle between the liquid Ni3Al and the TiC solid matrix was measured by using a 2AP-LEITZ high temperature microscope at 1420℃ under a flowing
Ar gas atmosphere. The effect of Mo addition into Ni3Al on the wettability of Ni3Al-TiC and the effect mechanism were mainly discussed. The result shows
that, the wetting angle of Ni3Al-TiC is as low as 17℃, indicating an ideal cermet system. When Mo is added, the wetting angle gains a further
decrease, lower than 11℃. It is considered that, a small amount of Mo diffuses into the boundary of TiC particles and forms solid solution. The substituted Ti
then reacts with Ni3Al in-situ. Thus decreases the tensile stress on the solid-liquid interface of Ni3Al-TiC, leading to a great improvement in the wettability between Ni3Al and TiC.

Key words: Ni3Al-TiC, Mo, wettability, effect mechanism

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