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Advances in the application of Ag powder

2019-01-08
Silver , a kind of transition metal.Silver exists in nature in elemental form, but most of it exists in the form of combination in the silver-ore.Silver has stable physical and chemical properties, good thermal and electrical conductivity, soft and ductility.Its reflection rate is very high, can reach more than 99%.It has many important USES.

 
Recently, spherical noble metal powders have attracted attention to be used as conductor materials for device applications like multi-layer ceramic capacitors, element star cells, and low-temperature co-fired ceramics. For the event of those applications, the particles should be spherical, non-aggregated, and with chemicals homogenous. Fine noble metal particles have already been ready by liquid section reactions like chemical reduction. However, the particles derived from these ways usually agglomerate throughout drying. Moreover, liquid section processes involve many prolonged steps, like the chemical change, separation, and drying, and that they result in a high environmental value as a result of giant amounts of solvent should be discarded.

 

Several forms of noble metal powder were used as conductor paste for a multilayer ceramic substrate. The shrinkage behavior of the Ag powder was investigated throughout the sintering. Bending and cracking were oftentimes discovered on the substrate once coarse powders that show a broad size distribution and aggregation were used. The shrinkage curve of the noble metal paste obtained by spray transformation united well thereupon of the substrate. what is more, the electrical properties of the noble metal paste were conjointly determined. The electrical resistance of a silver conductor forge at 900℃ was regarding 2.00×10-6 Ω・cm.


Screen-printed noble metal paste for star cells is studied by work the result of noble metal powder and glass frit on noble metal contract formation. tiny noble metal particle paste is well forge, forming a denser contract surface with lower bulk resistance and higher interface structure compared to it of huge noble metal particle paste. Flaky noble metal particle paste conjointly performs higher than that of spherical noble metal particle with similar size. Glass with neither too high glass transition temperature (Tg) nor too low Tg is suitable for noble metal paste. In experiment, noble metal paste of glass frit with Tg of ∼6100C shows very cheap bulk resistance. These results could offer reference in sensible.