自蔓延高温合成Ti_2SnC粉体及反应机理的研究  

Synthesis and Reaction Mechanism of Ti_2SnC by Self-propagation High-temperature Synthesis Technique

作　　者：孙和鑫 宋柏萱 陈红任 朱春城[1] 

机构地区：[1]哈尔滨师范大学化学化工学院,哈尔滨150025

出　　处：《材料导报》2016年第14期84-87,共4页Materials Reports

基　　金：国家自然科学基金(51572064)

摘　　要：采用自蔓延高温合成技术制备了Ti_2SnC粉体材料,利用XRD、SEM、EDS、TEM及DTA等分析手段对其形貌结构进行表征,在室温条件下其晶格参数a和c分别为3.186和13.630。分析了Ti2SnC的形成机制。在Ti-Sn-C反应体系中,Sn在232℃时熔化为液态,随着温度的升高,钛包裹在碳的外面形成钛碳层,继续加热Ti和Sn反应生成Ti-Sn金属间化合物TixSny,如Ti_6Sn_5和Ti_5Sn_3,在800℃左右钛碳层形成了TiC,在1100℃左右TiC与TixSny发生反应生成类盘状的Ti_2SnC。Ti2 SnC was synthesized by self-propagation high-temperature combustion synthesis （SHS）, and characterized by XRD, SEM, EDS and DTA. The room-temperature lattice parameters a and c of Ti2SnC are estimated to be 3. 186 A^° and 13. 630A^°, respectively. The SHS reaction mechanism in the Ti-Sn-C system was analyzed on the basis of the XRD, EDS, SEM and TEM as well as DTA. Sn started to melt into liquid at 232 ℃, while with the increasing temperature, C was coated by Ti layer. Then, Ti reacted with Sn to form Ti-Sn intermetallic compounds TixSny , such as Ti6Sn5 and Ti5 Sn3, and TiC presented at around 800℃ with much exothermic heat. At 1100℃, the plate-like Ti2 SnC was derived from TiC and TixSny.

关 键 词：Ti2SnC 自蔓延高温合成 反应机理 

分 类 号：TG148[一般工业技术—材料科学与工程]