Ca-Nd-Ti system moderate temperature co-fired ceramic, and preparation method therefor

Abstract

The present invention belongs to the fields of electronic ceramics and manufacturing thereof, relates to electronic materials technologies, and more particularly to a moderate temperature sintering CNT system microwave dielectric ceramic and a preparation method therefor. The raw materials of the ceramic are in mass percentage: 39.96% to 71.11% of Ca-Nd-Ti (CNT), 20.24% to 57.66% of Li-Nd-Ti (LNT) and 2.38% to 8.65% of a firing reduction agent. For the microwave dielectric ceramic prepared by using a preparation method provided by the present invention, the sintering temperature <= 1000 DEG C, the dielectric constant is between 60 and 100, and Qxf (GHz): 1500 to 2500 and close-to-zero tauf (3-15). The ceramic provided by the present invention can be used for manufacturing of microwave devices such as moderate temperature co-fired ceramic systems, multilayer dielectric resonators, microwave antennas, and filters.

Description

technical field [0001] The invention belongs to the field of electronic ceramics and its manufacture, and relates to a medium-temperature sintered Ca-Nd-Ti system microwave dielectric ceramic material and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics refer to ceramics that are used as dielectric materials in microwave (300MHz to 30GHz) frequency band circuits and perform one or more functions. They are key basic materials in modern communication technology and are widely used in dielectric resonators and filters. , dielectric substrate, dielectric waveguide circuit, microwave capacitor, duplexer, antenna and other microwave components. [0003] Dielectric ceramics used in the microwave frequency band should meet the following requirements: (1) a suitable dielectric constant to facilitate the miniaturization of the device (the size of the dielectric component and the dielectric constant ε r Inversely proportional to the square root...

AI Technical Summary

Problems solved by technology

However, the sintering temperature of undoped CNT ceramic materials is as high as 1350 ° C, which cannot be co-fired with copper

In order to reduce the sintering temperature, one of the traditional methods is to add low melting point oxides, such as B 2 o 3 and V 2 o 5 , while the free B 2 o 3 and V 2 o 5 In the late casting process, the viscosity of the slurry is too high and unstable, which limits its practical application; another method is to add low-melting glass, but the existence of the glass phase greatly increases the dielectric loss of the material, and the glass is in Unstable performance and high cost during smelting

Although some studies have focused on medium-temperature high-dielectric ceramics without a glass phase, there are not many systems that can be applied in actual production.

In addition, undoped CNT ceramic materials have a high resonant frequency temperature coefficient (τ f >200), which greatly limits the development of medium temperature co-firing technology and microwave multilayer devices

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