( 1. 西安交通大學 金屬材料強度國家重點實驗室，西安 710049；
2. 西安建筑科技大學材料科學與工程學院， 西安 710055)
摘 要: 用燃燒波淬熄法研究了TiC-Al金屬陶瓷自蔓延高溫合成中顯微組織的轉(zhuǎn)變， 淬熄試樣中保留了未反應(yīng)區(qū)、反應(yīng)區(qū)及反應(yīng)完成區(qū)。用掃描電子顯微鏡觀察了燃燒反應(yīng)中的顯微組織轉(zhuǎn)變過程，用能譜儀分析了各微區(qū)的成分變化，測量了燃燒溫度和燃燒波蔓延速度，并用XRD分析了反應(yīng)產(chǎn)物相的組成。結(jié)果表明，Ti-C-Al系燃燒反應(yīng)起始于鋁粉熔化后與固態(tài)鈦粉反應(yīng)生成Al3Ti，并隨著反應(yīng)溫度的升高， TiC顆粒從溶有鈦和碳的鋁熔體中析出；當Al3Ti熔化后，從熔體中也析出TiC顆粒，最終產(chǎn)物組織中除大量的TiC顆粒分布于鋁基體中外，還發(fā)現(xiàn)有少量的Al3Ti存在，可能與使用的鈦粉和鋁粉的原料顆粒較粗有關(guān)。
關(guān)鍵字: TiC-Al; 金屬陶瓷；自蔓延高溫合成；組織轉(zhuǎn)變
self-propagating high temperature synthesis
of TiC-Al cermet
（ 1. State Key Laboratory for Mechanical Behavior of Materials,
Xi'an Jiaotong University, Xi'an 710049, China;
2. School of Materials Science and Engineering,
Xi'an University of Architecture and Technology, Xi'an 710055, China）
Abstract: Through the combustion front quenching method, the microstructural evolution during self-propagating high temperature synthesis of TiC-Al cermet was studied, and the unreucted zone, reacting zone and reacted zone were remained in the quenched sample. The process of microstructure conversion in the quenched sample was observed with scanning electron microscope and energy dispersive spectrometer. The phase constituents of product were analyzed by XRD, and the combustion temperature and the propagating rate of combustion wave were measured. The results show that the combustion reaction among Ti, C and Al starts with the melting of Al and formation of Al3Ti, Ti and C gradually dissolve into the Al liquid solution, and TiC particles precipitate from the Ti-Al-C melt with the temperature rising, and TiC particles also precipitate from the melt after Al3Ti melting. In the final product, a large amount of TiC particles distribute on the Al matrix and a small amount of Al3Ti exist. This imcompleteness of the combution reaction attributes to the coarser Ti and Al powders.
Key words: TiC-Al; metal cermet; self-propagating high temperature synthesis; microstructural evolution
