(中南大學(xué) 粉末冶金國家重點(diǎn)實(shí)驗(yàn)室，長沙 410083)
摘 要: 采用質(zhì)量變化、氧含量測定、XRD、SEM和能譜分析研究鐵基合金粉末500 ℃氧化行為及氧化機(jī)理。結(jié)果表明，氧化質(zhì)量增量、氧含量隨時間變化明顯，前期呈線性關(guān)系，后期則呈拋物線關(guān)系；前期由于氧化時間較短，鐵基合金粉末顆粒與氧反應(yīng)不明顯，后期氧與顆粒表面反應(yīng)，生成Fe、Cr和Ti的氧化物，并形成致密的氧化膜；鐵基粉末形成(Fe, Cr)2O3相，隨著氧化時間的延長，形成的(Fe, Cr)2O3相衍射峰強(qiáng)度增強(qiáng)。
關(guān)鍵字: 鐵基粉末；氧化行為；氧化機(jī)理
（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:The oxidation behavior of an iron-based metal powder at 500 ℃ was investigated by mass gain and oxygen content measurements, X-ray diffraction, scanning electron microscope and energy spectrum analysis. The results show that the change of mass gain and oxygen content increase obviously with the time increasing; their relationship is linear at the former stage and parabolic at the later stage. The reaction between iron-based powder and oxygen at the initial stage was very slow. After a certain period, oxygen clearly reacted with the surface of the particles, and the formed oxide scale became thick and compact, which consisted of oxides of Fe, Ti and Cr, (Fe, Cr)2O3 was detected by XRD, the intensity of its diffraction peaks became stronger with time.
Key words: iron-based powder; oxidation behavior; oxidation mechanism
