激光诱导方钴矿自蔓延高温合成过程研究  

Laser-induced Self-propagating High-temperature Synthesis of Skutterudite

作　　者：姚磊 杨东旺 鄢永高[1] 唐新峰[1] YAO Lei;YANG Dongwang;YAN Yonggao;TANG Xinfeng(State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学材料复合新技术国家重点实验室,武汉430070

出　　处：《无机材料学报》2023年第7期815-822,I0006-I0008,共11页Journal of Inorganic Materials

基　　金：中央高校基本科研项目(WUT 2017-YB-013)。

摘　　要：通过自蔓延高温合成(SHS)及其衍生方法可以超快速地制备热电材料粉体或块体,并获得优异的热电性能。但是在采用SHS技术制备方钴矿材料的过程中,易出现非稳态SHS反应,使得反应后的坯体中产生杂相。本工作采用激光诱导点火和坯体预热相结合的方法,分别研究了激光点火的功率密度η和预热温度T0对方钴矿材料自蔓延高温合成过程的影响,总结了方钴矿CoSb3燃烧模式的变化规律,并获得了制备单相的工艺窗口。研究结果表明,当激光点火功率密度η固定时,随着预热温度T0升高,方钴矿的SHS反应存在“反应中止→非稳态螺旋燃烧→稳态燃烧→非稳态螺旋燃烧”的转变过程;在η=3.75 J·mm^(–2),250℃≤T0<370℃条件下,可以获得单相CoSb3。High performance thermoelectric powders or bulks can be quickly obtained by self-propagating high-temperature synthesis(SHS)or its derivative methods.In the process of preparing skutterudite by SHS technology,unsteady SHS reaction is easy to occur,which leads to impurity phase in the powders compact after reaction.In this work,the SHS process of the skutterudite was investigated via regulating the power density of the laser(η)and preheating temperature(T0)by laser induction and preheating of powders compact,respectively.The change of combustion mode for the skutterudite of CoSb3 was observed and the process window for single phase was obtained.As a result,with fixedhand increased T0,the state of the SHS process changes correspondingly,i.e.,reaction stop→unsteady spiral combustion→steady-state combustion→unsteady spiral combustion.With η=3.75 J·mm^(–2)and 250℃≤T0<370℃,the single-phase of CoSb3 can be obtained successfully.

关 键 词：自蔓延高温合成 方钴矿 包晶反应 稳态燃烧 非稳态螺旋燃烧 

分 类 号：TQ174[化学工程—陶瓷工业]