通过铺展实验研究添加Ti对NiAl金属间化合物与C/C复合材料润湿性的影响，发现添加Ti元素可改善熔融NiAl与C/C复合材料基体的润湿性。以低密度C/C复合材料为坯体，采用真空熔渗法制备C/C-NiAl复合材料，利用X射线衍射(XRD)和扫描电镜(SEM)对材料进行分析。结果表明：添加的Ti粉含量(质量分数)为15%时，C/C复合材料熔渗NiAl金属间化合物的效果最佳，且TiC颗粒与NiAl熔体在C/C复合材料内部呈网状分布；渗NiAl后材料的密度从1.35 g/cm3提高到2.47 g/cm3，开孔率从27%下降到15.1%，沿平行纤维排布面方向的洛氏硬度较未渗NiAl的C/C复合材料提高约30.7%。添加Ti能改善C/C复合材料渗NiAl性能的主要原因是Ti与C反应形成的TiC改善了NiAl在C/C复合材料中的化学吸附和物理吸附特性。
The influence of adding titanium on the wettability of molten NiAl intermetallic on the surface of C/C composites was investigated by spreading experiment. It is indicated that adding Ti can improve the wettability between C/C composites and NiAl intermetallic. Using the low-density C/C composite perform the C/C-NiAl composites were prepared by the vacuum molten infiltration. The composites were analyzed by X-ray diffraction(XRD) and scanning electronic microscope(SEM). The results show that NiAl with about 15%Ti (mass fraction) possesses good wettability on the surface of C/C composites. The TiC particles and NiAl melt present network distribution in C/C composites internal. The density increases from 1.35 g/cm3 to 2.47 g/cm3 while the porosity decreases from 27%to 15.1%after the infiltration of NiAl. On the other hand, the Rockwell hardness of C/C-NiAl composites increases by 30.7%in the direction parallel to fiber fabric plane compared with that of C/C composites. The improvement of adding Ti for molten NiAl infiltration into the C/C composites results from the improvement of the chemical and physical adsorption characteristics of NiAl alloy on the composites, which is caused by TiC from reaction of Ti and C.
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