Studies On The Composite Powder Of Silver And Palladium Used In Electronic Serum

Noble metals, for the stability of its chemical property and the good electrical conductivity, with the form of fine powders (0.1-1.2 u. m), are usually used as the thick film serum' s conductive stuffing in the electronic industry field. Along with the development of the micro- electronics industry, thick film serum is correspondingly more highly requested, and its conductive functional stuffing is developed from simple noble metals powder to composite gradable functional powder. On the other hand, palladium is possessed of the advantage of absorbing large quantity of hydrogen, which was used to produce high purified hydrogen, but we haven' t find any research on palladium or alloy being as the reductant of the adsorption of hydrogen. We conducted the initial experiments for the theoretically practically creative tentative plans in the tasks, and ravel the principle that palladium absorb and desorb hydrogen and the possible principle of reduction, and explored the possibility of preparing multilayer powders, with the carriers of fine single dispersion powders that has absorbed hydrogen, through reducing silver by desorbing hydrogen on the surface of fine palladium powders. From the view of metal powder metallurgy, besides single dispersion powders, the study on the composite powders become one of the goals we are trying to achieve, and this task sets a good example for the preparation of composite powders. This research may provide a series of Pd composite functional materials and a kind of fine composite power technique. A single metal possess its own limit, and the application of composite powder will improve the level of using Pd-Ag conductor in micro-electronics industry in order to meet the trend of development of micro-electronics industry. Meanwhile, as functional material, the composite materials developed have new capability compared to the single metal. Let's have Pd-Ag composite powder for example, and palladium and silver possess good conductivity and catalytic activity, at the same time, palladium and silver separately possess the advantage of adsorbing hydrogen. This kind of composite powders will change the features of oxidation and reduction of palladium, and also will change the catalytic activity of silver and palladium separately. Meanwhile, the hydrogen absorbed by palladium is desorbed in the state of hydrogen atom, so the reducibility is much stronger than that of molecule, and this will engender bilayer or multilayer composite powders, which will provide material foundation for the exploitation of new functional material, and which will optimize the uses of noble metals. It has a great academic meaning for the development of the metal powder metallurgy and the material composite techniques, and also it has an extensive future for catalyse, electronics and material industry.