Synthesis and formation mechanism of high-purity Ti3AlC2 powders by microwave sintering
Synthesis and formation mechanism of high-purity Ti3AlC2 powders by microwave sintering
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微波烧结高纯Ti3AlC2粉末的合成及形成机理
DOI：
10.1111/ijac.13452
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发表时间：
2020-01-02
影响因子：
2.1
通讯作者：
Lin, Xinghao
中科院分区：
文献类型：
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作者：
Chen, Weihua;Tang, Jiancheng;Lin, Xinghao
以不同钛源为原料，采用微波烧结法合成了高纯Ti 3AlC 2粉末。采用差示扫描量热仪（DSC）、X射线衍射仪（XRD）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）对产物进行了表征。结果表明，以3 TiH（2）/1.2Al/2C混合物为原料，在1300 ℃、30 min的微波烧结条件下，合成的Ti 3AlC 2粉末纯度高（97.5%），粒度分布均匀。Ti_3AlC_2的形成机制可分为四个阶段。钛和铝之间的固相反应在低于铝的熔点时发生，并且主要产物是Ti 3Al相，其是用于形成Ti 2AlC和Ti 3AlC 2的观察到的中间化合物。本研究为低温合成高纯Ti 3AlC 2材料提供了一条有益的途径。
High-purity titanium aluminum carbide (Ti3AlC2) powders were synthesized by a microwave sintering method using different titanium sources as raw materials. The prepared products were characterized by differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results indicated that the synthesized Ti3AlC2 powders have high purity (97.5%) and even distribution of the grain size when using a 3TiH(2)/1.2Al/2C mixture as raw materials when the microwave sintering temperature and time were 1300 degrees C and 30 minutes, respectively. The formation mechanism of the Ti3AlC2 is described as proceeding via four stages. The solid-phase reaction between titanium and aluminum occurs below the melting point of aluminum and the main product is a Ti3Al phase, which is an observed intermediate compound for the formation of Ti2AlC and Ti3AlC2. Thus, this study provides a beneficial approach to low-temperature synthesis of high-purity Ti3AlC2 materials.