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反應(yīng)合成Ti_3Al/TiC+Al_2O_3復(fù)合材料燒結(jié)過(guò)程熱力學(xué)分析
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TB331;

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山東省自然科學(xué)基金(Q99F01)，山東大學(xué)博士基金資助項(xiàng)目


Thermodynamic Analysis in Reaction Syntheses of Ti_3Al/TiC+Al_2O_3 Composite
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    摘要:

    將高能球磨后的Ti-Al粉末和TiC,Al2O3粉末混合進(jìn)行熱壓燒結(jié),在燒結(jié)的過(guò)程中反應(yīng)生成金屬間化合物為增強(qiáng)相的復(fù)合材料。通過(guò)對(duì)粉料的X射線衍射分析、熱分析(DSC)和燒結(jié)體的成分分析表明,最終的金屬間化合物只有Ti3Al而沒(méi)有其它金屬間化合物相。通過(guò)熱力學(xué)計(jì)算,分析了反應(yīng)燒結(jié)過(guò)程并發(fā)現(xiàn)在低溫由固相間原子擴(kuò)散控制生成TiAl3,TiAl,Ti3Al的漸進(jìn)過(guò)程,和在高溫下金屬間化合物的合成機(jī)理,而且增強(qiáng)相和基體界面間處于穩(wěn)定狀態(tài)。

    Abstract:

    The intermetallic-compounds-strengthened composite was reaction synthesized by hot pressing sintering the mixture of ball-milled Ti-Al powder and TiC+Al2O3 powder. According to the X-ray analysis and thermal analysis (DSC) of the powder and its components analysis of the sintering product, it shows that there are no other compounds but Ti3Al.Through thermodynamic calculation, the author analysized the reaction synthesized process, and found the gradual synthesis process from TiAl3 to TiAl, then to Ti3Al controlled by the diffusion under lower temperature and the formation mechanism of intermetallics compounds at high temperature, and it is in stable state at the interface between matrix and strengthening phases.

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李江田,孫康寧,趙萍,李愛民,王素梅.反應(yīng)合成Ti_3Al/TiC+Al_2O_3復(fù)合材料燒結(jié)過(guò)程熱力學(xué)分析[J].稀有金屬材料與工程,2005,34(9).[Li Jiangtian, Sun Kangning, Zhao Ping, Li Aimin, Wang Sumei. Thermodynamic Analysis in Reaction Syntheses of Ti_3Al/TiC+Al_2O_3 Composite[J]. Rare Metal Materials and Engineering,2005,34(9).]
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