Ni_3Al对TiC的润湿性及Mo添加的影响

THE Ni_3Al- TiC WETTABILITY AND EFFECT OF Mo ADDITION

为了研究Ｎｉ＿３Ａｌ／ＴｉＣ之间的润湿性，本工作利用两种Ｎｉ＿３Ａｌ，即熔炼方法制备的块体Ｎｉ＿３Ａｌ、ＳＨＳ方法制备的Ｎｉ＿３Ａｌ粉末，和致密ＴｉＣ基板，通过高温摄影显微镜实验测定了Ｎｉ_３Ａｌ－ＴｉＣ之间的接触角。结果表明：无论哪一种Ｎｉ＿３Ａｌ，它们与ＴｉＣ之间的接触角都在１８°以内，表现出与ＴｉＣ之间的良好的润湿性；当Ｎｉ＿３Ａｌ压粉体中掺入少量Ｍｏ时，接触角降为１１°左右。用ＸＲＤ、ＥＰＭＡ等方法分析和观察了实验样品的组成、结构、断面形貌及其元素分布。探讨了Ｍｏ对改善Ｎｉ_３Ａｌ－ＴｉＣ润湿性的作用机理。

To examine the wettaHlity between Ni_3Al and TiC,this work uses adensifiedTiC matrix and two kinds of raw Ni3Al materials:one is a mass form prepared by a meltingmethod and the other is a powder form prepared by an SHS method. By using a high-temperature microscope,the Ni_3Al-TiC contact angle is measured under 1420℃ with theprotection of Ar gas,The resuIt indicates that for either of the two kinds of Ni_3Al, theNi_3Al-TiC contact angle is within 18°,showing a good wettability between the twomaterials. When Mo is added into the Ni3Al powder,the contact angle is decreased to 11°。Then,the composition,structure,fracture image and element distribution of the testedspecimens are also analysed,and the mechanism improving the Ni_3Al-TiC wettability byadding Mo is discussed.