【摘要】：通過共沉淀-熱分解還原法,研究了一種容易實現(xiàn)的大規(guī)模制備Fe-Ni合金粉末的方法,根據(jù)質(zhì)量守恒和同時平衡原理,建立了Ni~(2+)-Fe2~(2+)-C_2O_4~(2)--C_2N_2H_8-H_2O體系的熱力學(xué)分析模型,并根據(jù)模型進行了相關(guān)計算,繪制了溶液中金屬離子濃度對數(shù)-pH圖,系統(tǒng)研究了沉淀過程中溶液pH值對溶液中各離子濃度的影響。結(jié)果表明,當pH值為3.5時,溶液中鎳離子和亞鐵離子的總濃度[Ni~(2+)]T、[Fe~(2+)]T達到一致,鎳離子和亞鐵離子的沉淀率相同,且沉淀基本完全,此時能夠得到成分均勻性良好的Fe-Ni前驅(qū)體粉末。然后,將前驅(qū)體粉末在氫氬混合氣氛中進行熱分解還原,最終得到符合預(yù)期Ni/Fe摩爾比的合金粉末。
[Abstract]:Based on the principle of mass conservation and simultaneous equilibrium, the thermodynamic analysis model of Ni~ (2) -Fe _ 2C _ 2C _ 2O _ 4 ~ (2) -C _ 2N _ 2H _ 2S _ 2O system for Fe-Ni alloy powder was established by means of coprecipitation and thermal decomposition reduction method. The logarithmic pH diagram of metal ion concentration in solution was plotted according to the model, and the influence of solution pH value on each ion concentration in solution was studied systematically. The results show that when the pH value is 3. 5, the total concentration of nickel ion and ferrous ion [Ni~ (2)] T and [Fe~ (2)] T are consistent, the precipitation rate of nickel ion and ferrous ion is the same, and the precipitation is basically complete. At this time, the Fe-Ni precursor powder with good homogeneity can be obtained. Then, the precursor powder was thermal decomposed and reduced in the mixed atmosphere of hydrogen and argon, and the alloy powder with expected Ni/Fe molar ratio was obtained.
【作者單位】： 中南大學(xué)冶金與環(huán)境學(xué)院;
【基金】：國家自然科學(xué)基金資助項目(51304254) 湖南省科技計劃資助項目(2015JC3001)
【分類號】：TF123.71

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本文編號：2258115