Li4SrCaSi2O8-based microwave ceramic material applied to LTCC (low temperature co-fired ceramic) technology and preparation method of Li4SrCaSi2O8-based microwave ceramic material

By adding M2O-B2O3-SiO2 glass additives to Li4SrCaSi2O8 ceramics, the problem of high sintering temperature of Li4SrCaSi2O8 ceramics is solved, low-temperature co-firing and co-firing effect of silver electrodes are achieved, and excellent microwave dielectric properties are maintained, making it suitable for LTCC technology.

CN120736889APending Publication Date: 2025-10-03XIDIAN UNIV
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Patent Information

Application Number
CN202510840381.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-23
Publication Date
2025-10-03

AI Technical Summary

Technical Problem

The existing Li4SrCaSi2O8 ceramics have a high sintering temperature and cannot be co-fired with silver electrodes. In addition, the dielectric properties do not meet the technical requirements of LTCC. How to lower the sintering temperature while maintaining excellent microwave dielectric properties?

Method used

1% M2O-B2O3-SiO2 glass additive is added to Li4SrCaSi2O8-based microwave ceramics, and its composition ratio is controlled. Planetary ball milling and pre-sintering are then performed to form a glass liquid phase to reduce the sintering temperature while maintaining the chemical compatibility and microwave dielectric properties of the material.

Benefits of technology

The low-temperature sintering of Li4SrCaSi2O8 ceramics at 800-850°C was achieved, maintaining excellent microwave dielectric properties and improving the co-firing effect with silver electrodes, thereby increasing the practicality of ceramic materials in the field of LTCC technology.

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Abstract

The invention relates to a Li4SrCaSi2O8-based microwave ceramic material applied to LTCC (low temperature co-fired ceramic) technology and a preparation method thereof, the Li4SrCaSi2O8-based microwave ceramic material comprises microwave dielectric ceramic and a glass aid, the weight of the glass aid is 1% of the weight of the microwave dielectric ceramic, the chemical general formula of the microwave dielectric ceramic is any one of Li4SrCaSi2O8, Li < 4 + x < 1 > SrCaSi2O8 and Li4SrCa1 + x < 2 > Si2O8, x1 is equal to 0.04, and x2 is equal to 0.01; the formula of the glass auxiliary agent is M2O-B2O3-SiO2, and the formula of the glass auxiliary agent is as follows. The glass auxiliary agent comprises the following components in percentage by weight: 48%-58% of M2O, 37%-44% of B2O3 and 5%-8% of SiO2; the M2O is composed of Li2O and K2O, and the weight ratio of the Li2O to the K2O is (10-15): (6-11). The Li4SrCaSi2O8-based microwave ceramic material not only has a relatively low sintering temperature, but also keeps an excellent microwave dielectric property.
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