Analysis of the temperature curve control of silver paste sintering and its effect on bonding strength

Analysis of the temperature curve control of silver paste sintering and its effect on bonding strength

I. Introduction

Silver paste sintering technology is a common surface treatment technology for metal materials, which is achieved by applying silver paste to the metal surface and then sintering at a specific temperature to form a firm bond between silver paste and the metal surface. In the silver paste sintering process, the control of the temperature curve is one of the key factors, which not only affects the sintering effect of silver paste but also directly affects the bonding strength between silver paste and the metal surface. Therefore, this article will analyze the temperature curve control of silver paste sintering and its influence on bonding strength.
　　Two, The temperature curve control of silver paste sintering

The temperature curve control of silver paste sintering mainly includes the following steps:

Preheating: Before sintering, preheat the silver paste to increase its temperature, so that the moisture in silver paste is fully evaporated, avoiding bubbles and cracks caused by moisture evaporation during sintering.

Sintering temperature: The sintering temperature of silver paste needs to be selected according to the type of silver paste and the properties of the metal material. Generally, the sintering temperature of silver paste is between 400-800℃, and for some special materials, the sintering temperature may need to be higher. High temperature may cause decomposition of silver paste, reducing bonding strength; low temperature may cause the sintering effect of silver paste to be not obvious, and the bonding strength will be lower.

Insulation time: During the sintering process, silver paste needs to be kept at a certain temperature for a certain period of time to ensure that silver paste and the metal surface are in full contact and form a firm bond. If the insulation time is too short, the bonding strength between silver paste and the metal surface will decrease; if the insulation time is too long, it may cause over-sintering of silver paste, affecting the performance of silver paste.

Cooling: After sintering, cooling of silver paste is required. If the cooling rate is too fast, cracks may appear on the surface of silver paste; if the cooling rate is too slow, bubbles may form in silver paste, reducing bonding strength.

Three, The influence of silver paste sintering temperature curve on bonding strength

The influence of the temperature curve of silver paste sintering on bonding strength is mainly reflected in the following aspects:
　　Temperature: The sintering temperature of silver paste directly affects its bonding strength. If the temperature is too high, the sintering effect of silver paste will be affected, leading to a decrease in bonding strength; if the temperature is too low, the bonding effect of silver paste will not be good, and the bonding strength will be lower.

Insulation time: If the insulation time is too short, the bonding strength between silver paste and the metal surface will decrease; if the insulation time is too long, the bonding effect of silver paste will be affected, and the bonding strength will also decrease.

Cooling rate: If the cooling rate is too fast, cracks may appear on the surface of silver paste, leading to a decrease in bonding strength; if the cooling rate is too slow, bubbles may form in silver paste, reducing bonding strength.

Four, Conclusion

The control of the temperature curve in silver paste sintering has a direct impact on the bonding strength between silver paste and the metal surface. In actual production, it is necessary to reasonably control the temperature curve of silver paste sintering according to the type of silver paste and the properties of the metal material to achieve the best bonding effect. At the same time, the control of the temperature curve also has an important impact on the sintering effect of silver paste. Therefore, when sintering silver paste, the temperature curve needs to be strictly controlled to ensure the quality of silver paste sintering.

This article analyzes the temperature curve control of silver paste sintering and its influence on bonding strength, hoping to provide certain reference value for research and practice in the relevant field.