Effect of the viscosity of organic carrier on the quality of laser-assisted glass frit bonding

Localized laser bonding using a glass frit intermediate layer is an ideal technology to hermetically package devices without heating the function components. The glass frit paste is mainly composed of functional fillers, low temperature vanadate glass powder and organic carrier. The viscosity of glass frit has an important influence on screen printing, pre-sintering and laser bonding quality. The content of thickener in organic carrier is a significant reason to affect the viscosity of the paste. In this paper, the effect of organic carrier viscosity in glass frit was investigated in detail. The research shows that the organic carrier viscosity has direct influence on the on screen printing, pre-sintering and laser bonding quality. Shear force test were used to evaluate the bonding quality. After a series of experiments and analysis, we found that adding 8% of ethylcellulose can get a better result of screen printing, pre-sintering and laser bonding.