不锈钢粉尘中低温氢还原实验研究

分析了不锈钢粉尘的矿相结构,并对粉尘中各氧化物还原的热力学进行计算,采用自行设计的竖直螺旋管输送反应器,对不锈钢粉尘在中低温条件下进行氢还原实验,探讨了温度和反应时间对粉尘还原率的影响.结果表明,最长还原时间达到300 s,反应温度从500到700 ℃,还原率从39.36%升高到64.30%.     

Isopiestic solubility of hydrogen in vanadium alloys at low temperatures

The effect of substitutional solutes on the solution of hydrogen gas has been studied by means of hydrogen pressure-composition isotherms in vanadium alloyed with niobium, chromium, or titanium. An isopiestic solubility technique was employed to measure the hydrogen equilibrium pressures for the vanadium alloys from 223 to 473 K. In all the alloys studied, the reaction of hydrogen with the metal phase was exothermic and hydrogen followed Sieverts' law over a considerable range of hydrogen concentration. Additions of titanium to vanadium dramatically enhanced the isopiestic solubility of hydrogen, chromium significantly reduced the solubility, and niobium moderately in-creased the solubility. Sieverts' law behavior for hydrogen in the vanadium alloys showed that substitutional atoms did not act as local, deep traps for hydrogen. Former Graduate Student, Department of Materials Science and Engineering, Iowa State University