Analysis of the Effect of Silver Palladium Ratio on Conductivity in Silver Palladium Conductor Slurry

This article will explore in detailSilver palladium conductor pasteHow does the ratio of silver to palladium affect its conductivity. We take the slurry prepared with YB8501, a platinum brand produced by Advanced Institute (Shenzhen) Technology Co., Ltd., as the research object.

1、 Basic knowledge of silver palladium conductors

Silver palladium conductor is a widely used material in fields such as printed circuit boards (PCBs) and electronic ceramicsconductive pasteSilver has good electrical conductivity because the outer electronic structure of silver atoms makes it easy for their electrons to break free from the constraints of the atomic nucleus, forming free electrons that can move directionally and conduct current under the action of an electric field. Palladium acts as an antioxidant in the slurry, and its atomic structure and chemical properties enable it to prevent silver from being oxidized in certain environments. The ratio of the two has a significant impact on the performance of the slurry, and conductivity is an important parameter for measuring this effect.

2、 Experiment on YB8501 conductor paste of Yanbo brand

（1） Experimental testing methods

We use advanced four probe testers to measureResearch Platinum Brand YB8501 SlurryElectrical conductivity. During the testing process, the prepared slurries with different silver palladium ratios are evenly coated on a specially designed testing substrate to ensure uniform thickness and sufficient contact with the testing electrode, in order to reduce the influence of contact resistance on the measurement results. Then accurately place the four probes of the four probe tester on the surface of the slurry, apply a certain voltage through the instrument, measure the current flowing through the slurry, and follow Ohm's law（ $R=U\mathrm{/}I$Calculate the resistance based on R=U/I, and then use the reciprocal relationship between conductivity and resistance（ $G=1\mathrm{/}R$G=1/R) to obtain the value of conductivity.

（2） Experimental data

We chooseAdvanced Institute (Shenzhen) Technology Co., LtdComparative experiments were conducted on the YB8501 slurry of the research platinum brand, which measured the changes in conductivity using different ratios of silver and palladium as variables.

During the experiment, we tested slurries with silver palladium ratios of 7:3, 8:2, and 9:1 and measured their electrical conductivity. The following table shows the experimental results:

3、 Result analysis

（1） The intrinsic principle of the influence of silver palladium ratio on conductivity

From the perspective of atomic structure and electron cloud distribution, the electron cloud of silver atoms is relatively loose, and its outer electrons are more likely to participate in the conductive process. When the ratio of silver to palladium increases, more silver atoms participate in the system, resulting in an increase in the number of free electrons in the system. From the perspective of metal bonds, the metal bonds formed between silver atoms and between silver and palladium atoms are easier to migrate electrons as the silver ratio increases. This is because the binding of electrons by silver atoms is relatively weak, which facilitates the directional movement of electrons under the action of an electric field, thereby improving conductivity.

（2） The comprehensive impact of changes in different proportions

1. The effect of increasing the silver ratio can be clearly seen from the table, and as the silver palladium ratio increases, there is a significant improvement in conductivity. However, increasing the proportion of silver will affect the antioxidant effect of palladium, thereby affecting the stability of the conductor paste. As the proportion of silver increases, the relative content of palladium decreases, and the antioxidant capacity is weakened to some extent.
2. The effect of increasing the proportion of palladium: As the proportion of palladium increases, the electronic structure of palladium atoms is different from that of silver, and the outer electron cloud is relatively compact, making electron migration relatively difficult, resulting in a decrease in overall conductivity. Meanwhile, increasing the proportion of palladium may enhance the antioxidant capacity, but an excessively high proportion of palladium may affect the synergistic effect between silver and palladium, potentially affecting other properties of the slurry such as adhesion.

4、 Product application suggestions

In practical applications, it is necessary to comprehensively consider the silver palladium ratio based on actual conditions. If the operating environment of electronic devices is poor and there is a high risk of oxidation, the silver palladium ratio should be appropriately reduced to improve stability. When the device requires high conductivity and the working environment is stable, increasing the silver palladium ratio can be considered.

conclusion

Through this experiment, we can conclude that:Silver palladium conductor pasteThe proportion of silver and palladium actually affects its conductivity, and taking the research platinum brand YB8501 as an example, an increase in the proportion of silver and palladium will improve its conductivity. However, in practical applications, conductivity is only one aspect of performance requirements, while antioxidant capacity, stability, and other factors are equally important. This requires us to weigh and choose the most suitable product based on the actual situation.

The above data is for reference only, and specific performance may vary due to production processes and product specifications.