熔盐电解制备低成本Ti12LC钛合金的研究

Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China

摘要:

采用熔盐电解法由混合氧化物成功制备出了低成本Ti12LC合金，并对脱氧过程机理进行分析。结果显示：脱氧反应过程首先生成CaTiO3、低价氧化物Ti6O、Ti2O和Ca2Al2O5；其次随脱氧时间的进行钛的低价氧化物含量逐步增加，再其次出现金属钼，最后生成Ti12LC合金相。由于MoO2的理论电压低于TiO2、Al2O3，因此钼优先还原，且钼在b-Ti中能固溶，所以最终钼是以固溶体形式存在于钛中，而Fe2O3虽然理论分解电位更低，但由于含量低，而没有检测到铁的单质还原。通过对电解产物表面的背散射电子像分析，发现电解制备出的产物其形貌和Ti12LC合金的组织相似

Abstract:

Ti12LC low cost titanium alloys (Ti-4.5Al-1.5Fe-6.8Mo) were prepared by molten salt electrolysis with the mixed oxides as raw materials, and the electrolysis process was studied. The CaTiO3 and low valence oxide Ti6O, Ti2O and Ca2Al2O5 were formed firstly during the reaction. With the deoxy time increasing, the content of low valence titanium oxides increases, followed by appearing of the metal molybdenum. The final electrolytic product is the Ti12LC. The molybdenum is reduced prior to Ti and Al, because the theoretic reduction voltage of MoO2 is lower than that of TiO2 and Al2O3. The molybdenum can dissolve infinitely in b-Ti so the molybdenum exists in Ti in the form of solid solution. Although the theoretic reduction voltage of Fe2O3 is lower, the iron is not detected due to the low content. The surface of electrolytic product was analyzed by BEIs. It is found that the morphology of the electrolytic product is similar to that of Ti12LC titanium alloy