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.
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.
参考文献
| [1] | |
| [2] | |
| [3] | Liu C T, Stiegler J O. Mater. Eng., 1984, 100: 129--136. [2] Baker I, Schulson E M. Scripta Metall., 1989, 23: 1883--1889. [3] Choudhury A, Mukherjee A K. J. Mater. Sci., 1990, 25: 3142--3147. [4] Fuchs G E. Mater. Res. Soc. Symp. Proc., 1988, 133: 615--621. [5] Mei B C, Yuan R Z, Duan X L. J. Mater. Res., 1993, 8: 2830--2834. [6] 梅炳初, 袁润章(Mei B C, et al). 硅酸盐学报(J. Chin. Ceram. Soc.), 1994, 22: 168--173. [7] Zhang L M, Liu L, Yuan R Z, et al. Mater. Sci. & |
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