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SiCf/Ti-43Al-9V復(fù)合材料的界面反應(yīng)
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國家自然科學基金（50871086，51071122）；凝固技術(shù)國家重點實驗室自主課題（KP200906）；航空基金（2009ZF53062）


Interfacial Reaction of SiCf/Ti-43Al-9V Composite
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    摘要:

    利用纖維涂層法和真空熱壓工藝制備SiC纖維增強g-TiAl金屬間化合物（Ti-43Al-9V）復(fù)合材料，采用掃描電鏡（SEM）、能譜（EDS）、X射線衍射（XRD）儀等研究復(fù)合材料的界面反應(yīng)產(chǎn)物和界面反應(yīng)產(chǎn)物的生長動力學。結(jié)果發(fā)現(xiàn)，SiCf/Ti-43Al-9V復(fù)合材料的界面反應(yīng)生成了TiC、Ti2AlC和Ti5Si3，分三層分布。從SiC纖維到Ti-43Al-9V基體，界面反應(yīng)產(chǎn)物序列為：TiC/Ti2AlC/Ti5Si3+Ti2AlC (顆粒)。界面反應(yīng)產(chǎn)物的生長受擴散控制并遵循拋物線生長規(guī)律，其生長激活能Q和指前因子k0分別為190 kJ/mol和2.5×10-5 m·s-1/2。與其它Ti合金基的復(fù)合材料相比，g-TiAl基復(fù)合材料的界面熱穩(wěn)定性更好。

    Abstract:

    SiC fiber reinforced g-TiAl (Ti-43Al-9V) matrix composite was fabricated by Fiber Coating Method (MCF) plus Vacuum Hot Pressing (VHP). The interfacial reaction products of the composites were identified and the reaction kinetics was studied. According to the analysis results by means of scanning electron microscope, energy dispersive spectrometer and X-ray diffractometer, the interfacial reaction products of TiC, Ti2AlC and Ti5Si3 were formed during the consolidation and the heat treatment of the composite. The reaction products are distributed in three layers of TiC/Ti2AlC/Ti5Si3+Ti2AlC(particle) from SiC fiber side to matrix side. The growth of the interfacial reaction products is controlled by diffusion and follows a rule of parabolic rate. The activation energy Q and the pre-exponential factor k0 of SiCf/Ti-43Al-9V composite are 190 kJ/mol and 2.5×10-5 m·s-1/2, respectively. It is confirmed that the thermal stability of the interface for the present g-TiAl matrix composite is better than that for other Ti alloy matrix composites.

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代志強,楊延清,張 偉,趙光明,羅 賢,黃 斌. SiCf/Ti-43Al-9V復(fù)合材料的界面反應(yīng)[J].稀有金屬材料與工程,2012,41(5):790~794.[Dai Zhiqiang, Yang Yanqing, Zhang Wei, Zhao Guangming, Luo Xian, Huang Bin. Interfacial Reaction of SiCf/Ti-43Al-9V Composite[J]. Rare Metal Materials and Engineering,2012,41(5):790~794.]
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  • 收稿日期:2011-09-18
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