碳弧法中形成的碳包铁及其化合物纳米晶

THE NANOCRYSTALS OF CARBON-COATED IRON AND IRON COMPOUNDS PRODUCED IN CARBON ARC METHOD 

用直流碳弧法在阳极石墨棒中加入αFe或αFe2O3产生碳包铁及其化合物纳米晶,研究碳包铁及其化合物纳米晶的形貌,结构特性及穆斯堡尔谱,探讨碳包Fe纳米晶的形成原因.结果表明:在碳弧法中用掺αFe阳极棒时,可产生碳包αFe,渗碳体和奥氏体纳米晶;而用掺αFe2O3阳极棒可产生碳包αFe,渗碳体、奥氏体和γFe2O3纳米晶.

The nanocrystals of carbon coated iron and its compounds were produced by d.c.carbon arc method using a composite anode of α Fe or α Fe 2O 3 and graphite.The investigations of the morphology,structures and Mssbauer spectra of carbon coated iron and its compound nanocrystals were carried out.The formation of carbon coated Fe nanocrystals was discussed.The results show that the samples produced from α Fe and graphite composite anode contain α Fe,Fe 3C (cementite) and austenite nanocrystals,whereas the samples produced form α Fe 2O 3 and graphite composite anode contain α Fe,Fe 3C,austenite and γ Fe 2O 3 nanocrystals.The properties of nanocrystal encapsulated in graphite are different from that of itself.