Preparation of titanium nitride : Microwave-induced carbothermal reaction of titanium dioxide
Preparation of titanium nitride : Microwave-induced carbothermal reaction of titanium dioxide
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DOI：
10.1111/j.1151-2916.2002.tb00051.x
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发表时间：
2004-12
影响因子：
3.9
通讯作者：
R. Peelamedu;M. Fleming;D. Agrawal;R. Roy
中科院分区：
文献类型：
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作者：
R. Peelamedu;M. Fleming;D. Agrawal;R. Roy
在2kW，2.45GHz微波炉中进行了TiO2的碳热还原和氮化。碳，通常添加用于从TiO 2晶格中去除氧，也充当这些实验中的低温感受器。在>1200°C的温度下，混合物开始剧烈反应（自燃烧），这在相应的纯化合物中从未观察到。在自燃烧状态下，完全氮化钛转变所需的最小持续时间为1020分钟与化学计量的碳。与过量的C，转化时间下降到只有1分钟。CO去除和随后的Ni固定发生更直接的微波诱导的反应比在传统的氮化过程。在微波诱导的反应中没有发现连续Magneli相（Ti2nO2n−1）的中间形成。微波处理和燃烧的组合使得该路线具有经济效益。
Carbothermal reduction and nitridation of TiO2 was performed in a 2 kW, 2.45 GHz microwave furnace. Carbon, generally added for the removal of oxygen from TiO2 lattice also served as the low-temperature susceptor in these experiments. At temperatures >1200°C, the mixtures started reacting vigorously (self-burn), which was never observed with the respective pure compounds. In the self-burning state, the minimum duration required for complete titanium nitride transformation was ∼20 min with stoichiometric amounts of carbon. With excess C, the transformation duration dropped to just 1 min. CO removal and subsequent Ni fixation occur more directly in microwave-induced reactions than in conventional nitridation procedures. Intermediate formation of successive Magneli phases (Ti2nO2n−1) was not found in the microwave-induced reactions. The combination of microwave processing and combustion makes this route of economical interest.