Non-conventional Synthesis of the 413 MAX Phase V4AlC3
Non-conventional Synthesis of the 413 MAX Phase V4AlC3
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DOI：
10.1002/zaac.201600370
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发表时间：
2016-12
期刊：
影响因子：
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通讯作者：
C. M. Hamm;Tim Schäfer;Hongbin Zhang;Christina S. Birkel
中科院分区：
文献类型：
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作者：
C. M. Hamm;Tim Schäfer;Hongbin Zhang;Christina S. Birkel
V4AlC3属于耐人寻味的所谓最大相材料类别，它是以P63/MMC空间群的层状晶体结构结晶的三元碳化物和氮化物。它们结合了金属和陶瓷的特点，表现出优异的机械性能。单相产品的合成远非易事，因为需要高温，而大多数竞争相在热力学上也是稳定的。在这里，我们展示了基座辅助微波加热在60min内的非常规固相制备。通过使用放电等离子烧结技术的后续致密化，提高了近单一相化合物的结晶度。用热分析方法研究了V4AlC3的形成机理。用粉末X射线衍射法对中间产物和最终产物进行了表征。
V4AlC3 belongs to the intriguing class of materials of so-called MAX phases that are ternary carbides and nitrides crystallizing in a layered crystal structure with space group P63/mmc. They exhibit excellent mechanical properties combining characteristics of metals as well as ceramics. The synthesis of single-phase products is far from being trivial since high temperatures are required, while most competing phases are also thermodynamically stable. Herein, we show the non-conventional solid-state preparation by susceptor-assisted microwave heating within 60 min. The crystallinity of the nearly single-phase compound is enhanced by subsequent densification using the spark plasma sintering technique. The formation mechanism of V4AlC3 is investigated by means of thermoanalysis. Intermediate as well as final products are characterized by powder X-ray diffraction techniques.