The sintering behavior of the silver with various glass frits during firing was investigated. At first, the way to measure the degree of the silver sintering was established. To measure the sintering density (= the volume density[%] of solids in the fired film) could tell the degree of sintering objectively. In this study, the sintering density of some silver powders with the various types of glass frit was measured with the ladder of firing temperature. According to this study, the sintering density depended on the viscosity of the glass frit over 650°C firing temperature. It, of course, highly depended on the shape, size and dispersibility of silver powder.
Introduct ionRecently the use of MLC (Multi Layer Capacitor) chip on PCB (Printed Circuit Board) has increased. At the same time, the dielectric layer has become thinner and its number has increased. These things are main factors that lead the damage of MLC chips by PCB flexing on the assembling line. M I X chip market has been requested to make more robust product that has high mechanical strength and reliability. Therefore we have to deal with this issue as a paste maker. We investigated the sintering behavior of silver powders with various glass frits to know the mechanism of the silver sintering and the way to control the sintering state. That is essential work to achieve the above requirements and make the technology. [l] In this paper, the sintering behavior (by using sintering density measurement) of several kinds of silver powders with various glass frits under the firing temperature ladder was reported using sintering density measurement.
Sintering. Densitv Measurement(2.1) S i n t e r i n g i t v (ConceDt) Printed/Dry Paste Alumina Sub. -. L fi t: Dry Thickness la) Print Dattern (a) to measure the PVC Printed/Dry Paste @I Print pattern (b) to measure the sintering density Fia.1 Print Pattern The pattern(b), the narrow line, is suitable to mesure the thickness consistently. While, the pattern(a) is good to measure the PVC because it can reduce an error in the data. -.-t I ? I Pore in fired film I . . Fia.2 Schematic drawina of the calculation model The shape of pores and solids were assumed to be parallelepipedon. U) The volu me densitv of solid in drv fil m -on print pattern (a) The volume of dry film is Vdv = Ap x t (Ap: printed area, t: dry thickness) w = w m + w g (wm: metal weight, wg:glass weight)The weight of solid in dry film is
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