Ta base hydrogen doped by special elements through the alloy and preparation method, the chemical formula is Ta100‑(x+y+z)MxNyPz, where M is one or more elements in Ti, Zr and Hf; N is one or more elements of Ni or Co; P is one or more of the special elements Cr, Fe, Cu, Al, Y, Mo, Ru, Rh, W, Sn, Si, Mn, Zn and Mg. 10≤x≤30, 10≤y≤30, 5≤z≤20, x,y and z are all mole percent. The preparation method includes: cutting the raw material and cleaning the surface of the raw material; The raw material composition is calculated, and the raw material is weighed, and the alloy ingot is formed by arc melting. The invention makes use of vacuum arc melting method to prepare hydrogen permeable alloy film material with good hydrogen permeability and hydrogen brittleness resistance by adding various rare earth elements.
Hydrogen energy has the advantages of high efficiency, clean, renewable, abundant reserves, wide sources, high energy density, and has broad application prospects in semiconductor, fine chemical, aerospace, fuel cells and many other fields. It is an ideal secondary energy and has become a decisive new energy system in the 21st century. Many countries in the world are actively developing hydrogen energy. The development of hydrogen economy as a long-term goal. The source of hydrogen is very diverse, in addition to electrolytic water hydrogen production, extraction of industrial by-products (such as chlor-alkali, synthetic ammonia, coke oven gas, etc.) of hydrogen is also one of the effective ways to obtain hydrogen; Usually in industry, especially in advanced industrial fields, high-purity hydrogen gas is separated and purified. Hydrogen separation technology determines whether the obtained hydrogen meets the standards of industrial application, and is the most critical link in the preparation technology of high-purity hydrogen, which has aroused the interest of many researchers, and also promoted the development of hydrogen separation technology. Compared with pressure swing adsorption and cryogenic separation, metal membrane hydrogen separation materials have a broad application prospect because of their high permeability, high diffusion coefficient, good high temperature thermal stability and mechanical properties, excellent toughness and hydrogen selectivity.
At present, palladium and palladium alloys (such as Pd-Ag alloy) have been widely studied and applied in the field of hydrogen separation because of their high selective permeability to hydrogen, good thermal stability, mechanical stability and catalytic activity. However, palladium resources are very scarce and expensive, so it is urgent to develop new hydrogen separation metal film materials with low or no palladium and high hydrogen permeability. It is found that 5B group metals (Nb, V, Ta) have higher hydrogen permeability coefficient than palladium, but the cost is much lower than palladium alloy, which is a promising hydrogen separation membrane material. However, these pure metals can not be used in actual production because of the serious hydrogen embrittance caused by hydrogen infiltration process. Alloying is an effective way to solve the harm of hydrogen embrittlement.
