【摘要】 首次将自蔓延高温合成法(self-propagating high-temperature synthesis,SHS)用于锰铝中间合金的制备。采用Miedema生成热模型、金属间化合物的双参数模型估算了锰铝中间合金的标准生成焓、标准熵及比热容。通过理论计算确定了Mn3O4-Mn2O3-CaO-Al反应体系的绝热温度。以Mn2O3、Mn3O4和CaO、金属Al为原料,进行了锰铝中间合金的自蔓延反应合成试验,采用化学滴定、X射线衍射以及光学显微镜的方法对产物进行分析。理论计算和实验结果表明:反应体系的绝热温度为3 160K,确定了该体系进行自蔓延反应的可行性。采用自蔓延合成法制备出了锰含量高达78%以上的锰铝中间合金,拓宽了锰铝中间合金的生产工艺。更多还原

【Abstract】 Self-propagating high-temperature synthesis(SHS)is applied to produce Mn-Al master alloy for the first time.The thermodynamic data of Mn-Al master alloy are estimated,and the adiabatic temperature is calculated by Miedema model and two-parameter model of intermetallics.The reaction product is investigated by using chemical titration optical microscope,X-ray diffraction analysis,in which Mn2O3,Mn3O4 and CaO are taken as raw materials and Al as a reductive agent.Theoretical calculation and experimental results show that the adiabatic temperature is 3 160 K,and the feasibility of the SHS reaction is determined consequently.The content of manganese in master alloy is up to 78%,which broadens the methods of producing Mn-Al master alloy in practice.更多还原