(中南大學(xué) 粉末冶金國(guó)家重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083)
摘 要: 通過鋪展實(shí)驗(yàn)研究添加Ti對(duì)NiAl金屬間化合物與C/C復(fù)合材料潤(rùn)濕性的影響，發(fā)現(xiàn)添加Ti元素可改善熔融NiAl與C/C復(fù)合材料基體的潤(rùn)濕性。以低密度C/C復(fù)合材料為坯體，采用真空熔滲法制備C/C-NiAl復(fù)合材料，利用X射線衍射(XRD)和掃描電鏡(SEM)對(duì)材料進(jìn)行分析。結(jié)果表明：添加的Ti粉含量(質(zhì)量分?jǐn)?shù))為15%時(shí)，C/C復(fù)合材料熔滲NiAl金屬間化合物的效果最佳，且TiC顆粒與NiAl熔體在C/C復(fù)合材料內(nèi)部呈網(wǎng)狀分布；滲NiAl后材料的密度從1.35 g/cm3提高到2.47 g/cm3，開孔率從27%下降到15.1%，沿平行纖維排布面方向的洛氏硬度較未滲NiAl的C/C復(fù)合材料提高約30.7%。添加Ti能改善C/C復(fù)合材料滲NiAl性能的主要原因是Ti與C反應(yīng)形成的TiC改善了NiAl在C/C復(fù)合材料中的化學(xué)吸附和物理吸附特性。
關(guān)鍵字: C/C復(fù)合材料；NiAl金屬間化合物；鈦；熔滲；潤(rùn)濕性
（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract: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.
Key words: C/C composites; NiAl intermetallic; Ti; infiltration; wettability
