A kind of conductive silver paste and its preparation method and 5g ceramic filter

Abstract

The invention belongs to the field of material chemistry, and in particular relates to a conductive silver paste, a preparation method thereof and a 5G ceramic filter. The conductive silver paste provided by the present invention includes the following components in terms of weight percentage: 63-88% of silver powder; 1-6% of glass powder; 0.1-2% of inorganic additives; 0-1% of silver paste additives; organic vehicle 10~35%; the inorganic additive is Y 2 o 3 , Yb 2 o 3 , Nb 2 o 5 and Ta 2 o 5 one or more of. The invention significantly improves the performance of the conductive silver paste by optimizing the composition of the conductive silver paste, especially introducing specific types of inorganic additives. The experimental results show that the conductive silver paste provided by the invention matches the expansion coefficient of the 5G ceramic filter substrate, and has a wide matching range, good electrical conductivity, high adhesion, high sintering density, and can withstand high-temperature thermal shock of multiple printing and sintering Good performance, excellent dielectric properties.

Description

technical field [0001] The invention belongs to the field of material chemistry, and in particular relates to a conductive silver paste, a preparation method thereof and a 5G ceramic filter. Background technique [0002] With the advent of the 5G era, the adjustment of 5G base station construction has increased. Compared with 4G general-purpose small metal cavity filters, 5G ceramic filters have a higher Q value, lower insertion loss, and high dielectric constant. The size is smaller, the weight is lower, and the price of ceramic powder raw materials is low, and the cost is lower than that of metal filters. Therefore, ceramic filters will occupy the main market of 5G filters. The three major domestic operators began to carry out 5G infrastructure construction in 2019, and the peak period of 5G construction will be from 2020 to 2025. 5G ceramic filters will usher in rapid development, and the market is expected to be no less than 66 billion yuan. [0003] Ceramic filter sur...

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Problems solved by technology

[0004] There are many kinds of materials prepared by ceramic filters, the main raw materials are: magnesium hydroxide, magnesium titanate, calcium carbonate, magnesium oxide, barium carbonate, zinc oxide, strontium carbonate, aluminum oxide, lanthanum trioxide, samarium oxide, etc., due to the composition There are many types and various formulas. At the same time, due to the high performance requirements of the follow-up filter, high ceramic density and less pores, the metallized silver paste on the surface is required not only to match the expansion coefficient well, but also to have good bonding force. It should also have The sintering is dense, the conductivity is good, and the high temperature thermal shock of repeated printing and sintering is resistant. The existing known silver paste technology is mainly used in general ceramics, such as alumina, zinc oxide, aluminum nitride and other substrates, or applications with Ca- Mg-Si-Al 2 o 3 And other materials, but the density of the base material is low, and the follow-up performance only requires good bonding force and normal appearance. There are no requirements for dielectric properties, multiple thermal shocks, and high density.

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