Method for determining hydrogen absorption/desorption thermodynamic parameter of hydrogen storage alloy
A technology of hydrogen storage alloy and thermodynamics, applied in the direction of testing metals, instruments, analysis materials, etc., can solve the problems of heavy workload, low reliability, and inability to realize automatic computer analysis in the analysis process, so as to ensure intuitiveness and improve accuracy. and reliability, improving efficiency
Inactive Publication Date: 2015-04-22
YANGZHOU UNIV
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[0004] The purpose of the present invention is to provide a method for determining the thermodynamic parameters of hydrogen storage alloy absorption / desorption, which is fast, efficient and accurate, and overcomes the large data error and low reliability of the hydrogen absorption / desorption thermodynamic parameters of hydrogen storage alloys in the past. The workload of the analysis process is heavy, and the shortcomings of automatic computer analysis cannot be realized
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[0049] Example
[0050] Preparation of Hydrogen Storage Alloy LaNi 5 , the raw material metals are La 99wt%, Ni 99.9wt%. Vacuum induction melting under the protection of argon is adopted. After melting, the alloy is put into a quartz tube with a vacuum degree of 1Pa for annealing, and it is rapidly heated at 1000°C for 6 hours. Quenched in water. Annealed samples were chemically analyzed to verify compositional accuracy. Finally, weigh about 1g of the sample and put it into the sample chamber of the hydrogen storage alloy hydrogen absorption and desorption performance tester, and carry out the hydrogen absorption / desorption pressure-concentration isotherm at 40°C, 60°C and 80°C in the environment of a constant temperature water bath test. The test obtained the data in Table 1, Table 2 and Table 3 below. Then open the MATLAB software to create an array named PCT in the Workspace window, copy the measured isotherm data into the PCT array, and determine the calculated tempera...
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The invention relates to a method for obtaining key performance parameters of an alloy material, particularly to a method for the determining hydrogen absorption / desorption thermodynamic parameter of hydrogen storage alloy. The method comprises the steps as follows: firstly, a hydrogen storage alloy hydrogen absorption / desorption performance tester is utilized to carry out a dependence test so as to obtain hydrogen absorption / desorption pressure-concentration isotherm data of the hydrogen storage alloy at different temperatures, then, a series of automatic analysis and process are performed on the experimental data, and finally, the hydrogen storage alloy hydrogen absorption / desorption enthalpy change data, hydrogen absorption / desorption entropy change data, and the gibbs free energy change data at the set temperature are output. According to the invention, the hydrogen storage alloy component-performance screening efficiency and the reliability of the analysis conclusion in engineering application are greatly improved, and the problems that the past hydrogen storage alloy hydrogen absorption / desorption thermodynamic parameter data is great in dispersibility, high in mistake occurrence probability, complicated in analytical test process, and not visual enough in data output are solved.
Description
technical field [0001] The invention relates to a method for obtaining key performance parameters of alloy materials, in particular to a method for determining the thermodynamic parameters of hydrogen absorption / desorption of hydrogen storage alloys. Background technique [0002] In the 1960s, it was discovered that some alloys could reversibly absorb and desorb hydrogen quickly and in large quantities, which triggered a worldwide research boom on hydrogen storage alloys. At present, hydrogen storage alloys have been widely used in many fields such as hydrogen storage, transportation and compression, isotope separation and storage, heat pumps and air conditioners, nickel-metal hydride batteries, diamond synthesis, ammonia synthesis, and permanent magnet production. In various applications, the enthalpy change ΔH associated with the hydrogen absorption / desorption process of the alloy o , entropy change ΔS o , Gibbs free energy change ΔG o It is an important parameter that ...
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IPC IPC(8): G01N33/20G01N35/00
Inventor 程宏辉王笃雄金朝阳黄新李超严凯王昌龙王妹婷
Owner YANGZHOU UNIV