A possible mechanism on synthesis of Ti3AlC2
A possible mechanism on synthesis of Ti3AlC2
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DOI：
10.1016/s0921-5093(02)00937-1
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发表时间：
2003-07
期刊：
影响因子：
6.4
通讯作者：
Aiguo Zhou;Chang-An Wang;Yong Huang
中科院分区：
文献类型：
--
作者：
Aiguo Zhou;Chang-An Wang;Yong Huang
以Ti、Al4C3和活性炭为原料，分别通过热压（HP）和放电等离子烧结（SPS）成功合成了三元碳化物相Ti3AlC2。 HP工艺的均热温度为1400℃，均热时间为5至120分钟。 SPS工艺的均热温度为1300℃，均热时间为1至7分钟。根据X射线衍射仪（XRD）和扫描电子显微镜（SEM）的结果，提出了一种可能的机制：首先，在一定的烧结温度下，形成了大量的Ti6C八面体。此后，根据不同的均热温度，由Ti6C八面体得到两种不同的中间产物。一种中间产物是 Ti2AlC，它是通过铝平面将 Ti6C 八面体的每一层连接在一起而获得的。另一种是Ti6C八面体直接连接在一起得到的TiC。最后，随着保温时间的延长，中间产物转变为Ti3AlC2。 Ti2AlC 失去一半的铝层，然后转变为 Ti3AlC2。 TiC晶体中的Ti6C八面体被铝平面隔开，然后TiC转变为Ti3AlC2。
A ternary carbide phase, namely Ti3AlC2, was successfully synthesized by hot pressing (HP) and spark plasma sintering (SPS), respectively, from the starting materials of Ti, Al4C3and activated carbon. The soaking temperature of HP process was 1400°C and the soaking time varied from 5 to 120 min. The soaking temperature of SPS process was 1300°C and the soaking time varied from 1 to 7 min. Based on the results of X-ray diffractometer (XRD) and scanning electron microscopy (SEM), a possible mechanism was presented: firstly, at a certain sintering temperature, plenty of Ti6C octahedra are formed. Thereafter, two different intermediate products are obtained from the Ti6C octahedra depending on different soaking temperatures. One intermediate product is Ti2AlC obtained by linking every layer of Ti6C octahedra together by an aluminum plane. The other is TiC obtained by linking the Ti6C octahedra together directly. Finally, the intermediate products transform to Ti3AlC2as the soaking time is extended. Ti2AlC loses half of its aluminum layers and then transforms to Ti3AlC2. Ti6C octahedra in TiC crystals are separated by aluminum planes and then TiC transforms to Ti3AlC2.