Zr < Sub > 9 < / Sub > Ni < Sub > 11 < / Sub > And Zrv < Sub > 0.4 < / Sub > Fe < Sub > 1.6 < / Sub > Alloy Resistance To Poison

Tritium is widely used in nuclear industries. As a gaseous radioactive isotope, the tritium should be controlled carefully. However, the imperceptible leak is unavoidable. The waste gases contain tritium need further handling and the tritium should be extracted. The hydrogen storage alloys are the better choice to extract the gaseous tritium for its’ low costs, environmental friendly feature, simple structure of instrument. However, there are some questions need to be solved. just like poisoning by impure gas. The alloy which hydrogen storage and anti-poisoning properties are best should be selected in order to use the hydrogen storage alloy to extract tritium from mixed gases. The hydrogen storage properties of zirconium-system alloys are suit for the requirements, but their anti-poisoning ability has not been studied. So we chose the Zr9Ni11and ZrV0.4Fe1.6alloys to research their hydrogen storage properties at various temperatures and hydrogen pressures, we also tested the impacts of CO, CO2, O2on the hydrogen storage properties of the alloys for using them to handle with the waste gases contain tritium. A new method to improve the anti-poisoning ability of Zr9Ni11has been created. In this research, the hydrogen storage properties of alloys was tested by constant volume and pressure swing method, the poisoning experiment was made by gas doping and exposure method. The phase structure and surface micro-morphology of the alloy samples were analyzed by XRD, SEM, TEM technology. The results of experiments are as shown below.(1) The hydrogen storage capacity of Zr9Ni11and ZrV0.4Fe1.6are0.00423mol/g and0.00367mol/g, respectively. The hydrogen storage capacity and reaction rate of Zr9Ni11are better than ZrV0.4Fe1.6.(2) The effects of temperature on the hydrogen storage properties of ZrV0.4Fe1.6are more serious than that of Zr9Ni11although the increase of temperature can lead their properties decrease together.(3) The decrease of initial hydrogen pressure can lead hydrogen storage properties of Zr9Ni11and ZrVo.4Fe16alloys decrease together. The kinetic properties of Zr9Ni11are better than that of ZrV0.4Fe1.6alloy.(4) The effects of CO on the hydrogen storage properties of alloys are serious and the anti-poisoning ability to CO of ZrV0.4Fe1.6is better than that of Zr9Ni11. The phase structures of Zr9Ni11and ZrV0.4Fe1.6alloy are changed to be amorphous state and mischcrystal, and the amorphous state and mischcrystal are reduced while the Zr7Ni10and ZrV0.4Fe1.6phases are generated.(5) The effects of CO2on the hydrogen storage properties of alloys are not as serious as CO and the anti-poisoning ability to CO2of Zr9Ni11is better than that of ZrV0.4Fe1.6.(6) The poisoning ability of O2is so strong that the further researches need to be made.(7) The anti-poisoning ability to CO of Zr9Ni11alloy was increased by the new cycling heat treatment method.The operating conditions of temperature and initial hydrogen pressure of Zr9Ni11and ZrV0.4Fe1.6alloys are obtained, and the anti-poisoning ability of the two alloys to CO, CO2, O2also is tested. So this research can provide some technological base to use the zirconium-system alloys to handle with the waste gas containing tritium.