Metal Nano Ink and Application Technology in the Electronics Industry (4)

In mixed silver inks, the proportion of silver nanoparticles in the total silver content is good, and practice has shown that it accounts for a ratio of 10% to 20%. Too little modification effect is not obvious, too much will cause unnecessary waste.

It should be noted that when we formulate mixed silver inks, in addition to taking into account the percentage of silver, what type of resin structure is used, what the molecular weight is, and what additives and mixed solvents are used will affect the ink. Printability (viscosity, thixotropy, adhesion, drying and curing properties, etc.).

Figure 4 is a test sample (electronic part) printed with a hybrid silver ink screen. The data obtained after the sample was subjected to the reliability test is shown in Table 4.

From the comparison data in Table 4, it can be seen that the reliability of hybrid silver ink is significantly higher than that of ordinary silver ink. If there is no special fineness requirement for printed graphics, it is undoubtedly the best choice for the printing of highly conductive and highly reliable electronic components.

Another point to be reminded is that the mixed silver ink has a relatively low cost, but the conductivity and reliability have been greatly improved (compared with ordinary silver ink), and the ink can be applied in many fields through the screen printing method. :

(1) Electronic circuit printed on the heat-resistant organic substrate;
(2) forming a BVH on a composite substrate;
(3) printing and bonding of micro-electrode parts;
(4) In addition to the above applications, all kinds of electronic components with high conductivity and high reliability that can be sintered at a low temperature (200-250°C) can be realized by screen printing using a mixed silver ink.

(author/Li Jiang)

Source: "Screen Printing" 2005, 4