Synthesis and thermal stability of Cr2AlC

Synthesis and thermal stability of Cr2AlC
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Cr2AlC的合成及热稳定性

DOI:
10.1016/j.jeurceramsoc.2011.01.009
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发表时间:
2011-07
期刊:
Journal of European Ceramic Society
影响因子:
--
通讯作者:
李世波
李世波
中科院分区:
其他
文献类型:
--
作者:
李世波

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以AlCr 2+和C为原料,采用一种新的反应路线制备Cr2 AlC。将AlCr 2+和C粉在1400°C、20 MPa、Ar气氛下热压1h,得到Cr2 AlC块体陶瓷。研究了在1050-1400°C温度范围内形成Cr2 AlC的机理。结果表明,Cr2 AlC是由C和AlCr 2反应直接生成的。采用差热分析、X射线衍射、扫描电镜等手段对反应过程、物相组成和显微结构进行了表征。所制备的Cr2 AlC陶瓷在Ar气氛中高达1500°C是稳定的,但在1500°C以上分解成Al 8 Cr 5和Cr23 C6。
A new reaction route with AlCr2and C as starting materials has been developed to produce Cr2AlC. A Cr2AlC bulk ceramic was achieved by hot pressing the AlCr2and C powders at 1400°C with 20MPa for 1h in Ar. The mechanism to form Cr2AlC in a temperature range of 1050–1400°C was studied. It was confirmed that Cr2AlC is formed directly by a reaction between C and AlCr2. The reaction process, phase composition and microstructure were characterized with differential thermal analysis, X-ray diffractometry and scanning electron microscopy. The produced Cr2AlC ceramic is stable up to 1500°C in an Ar atmosphere, but decomposes into Al8Cr5and Cr23C6above 1500°C.
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