反应热压制备TiC/Al复合材料的形成途径研究  

Investigation on Formation Path of TiC/Al Composite Obtained by Reactive Hot-pressing Technology

作　　者：宋谋胜[1] 冉茂武[1] 

机构地区：[1]铜仁学院物理与电子科学系,贵州铜仁554300

出　　处：《热加工工艺》2012年第8期92-95,共4页Hot Working Technology

基　　金：贵州省科研条件特助经费资助项目(TZJF2010040);铜仁学院科研基金资助项目(DS1102)

摘　　要：利用场激发反应热压合成技术研究了Al-Ti-C混合粉末体系制备TiC/Al产物的过程与致密性,并结合DSC实验分析了该体系合成TiC相的形成途径。结果表明,采用反应热压合成法完全能够制备较致密的TiC/Al复合材料。该体系形成TiC相的反应过程为:Ti(s)+3Al(s)=TiAl3(s)→Al(s)=Al(l)→Ti(s)+3Al(l)=TiAl3(s)→TiAl3(s)=TiAl3(l)→TiAl3(l)+C(s)=TiC(s)+Al(l)。混合粉末中的Al不仅作为稀释剂降低体系的反应温度而细化TiC晶粒,还作为反应剂参与了整个反应进程。Utilizing the field activation reactive hot-pressing （RHP） technology, the process and densification of TiC/AI products obtained from A1-Ti-C mixtures system were investigated, coupled with the DSC experiment to analyze the lbrmation path of TiC phase in this system. The results show that the dense TiC/A1 composite can be fully fabricated by the reactive hot-pressing method. The reaction process of the A1-Ti-C system to form TiC phase can be expressed： Ti（s）＋3Al（s）= TiA13（s） →Al（s）=Al（1）→Ti（s）＋3Al（1）=TiAla（s）→TiA13（s）=TiA13（1）→TiA13（1）＋C（s）=TiC（s）＋Al（l）. Al in the mixtures plays an important role in serving not only as a diluent to decrease the reaction temperature and thus to refine the TiC grains, but also as an intermediate reactant to participate in the whole reaction process.

关 键 词：反应热压 TIC 途径 稀释剂 

分 类 号：TB333[一般工业技术—材料科学与工程]