Low temperature sintering temperature-stable microwave dielectric ceramic material and preparation method thereof

A microwave dielectric ceramic, temperature-stable technology, applied in the field of electronic ceramics and its preparation, can solve the problems of high sintering temperature and inability to apply multi-layer microwave devices, and achieves low sintering temperature, excellent microwave dielectric properties, and reduced dielectric The effect of loss

Active Publication Date: 2014-07-16
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
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  • Application Information

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Problems solved by technology

In 2013, although Zhou Di et al reported 0.7Li 2 ZnTi 3 o 8 -0.3Li 2 TiO 3 Ceramics have excellent microwave dielectric properties after being sintered at 1100°C for 2 hours, but the sintering temperature is still too high (about 1100°C), so it cannot be applied to the production of multilayer microwave devices, so a small amount of sintering aids need to be added to achieve low-temperature sintering while maintaining excellent microwave dielectric properties

Method used

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  • Low temperature sintering temperature-stable microwave dielectric ceramic material and preparation method thereof
  • Low temperature sintering temperature-stable microwave dielectric ceramic material and preparation method thereof
  • Low temperature sintering temperature-stable microwave dielectric ceramic material and preparation method thereof

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Embodiment 1

[0029] Embodiment 1: the first step: with Li 2 CO 3 , ZnO and TiO 2 Raw material according to Li 2 ZnTi 3 o 8 The stoichiometric ratio ingredients were wet ball milled for 24 hours, dried and placed in an alumina crucible, and then the alumina crucible was placed in a high-temperature box-type electric furnace at 900 ° C for 4 hours to obtain Li 2 ZnTi 3 o 8 Powder;

[0030] The second step: the Li 2 CO 3 and TiO 2 Raw material according to Li 2 TiO 3 The stoichiometric ratio ingredients were wet ball milled for 12 hours, dried and placed in an alumina crucible, and then the alumina crucible was placed in a high-temperature box-type electric furnace at 920 ° C for 2 hours to obtain Li 2 TiO 3 Powder;

[0031] The third step: the ZnO, B 2 o 3 and SiO 2 The raw materials are dosed according to the composition requirements described in Table 1, and then dry milled in a planetary ball mill for 6 hours. The speed of the planetary ball mill is 350 rpm to obtain a mi...

Embodiment 2

[0039] Embodiment 2: the first step: with Li 2 CO 3 , ZnO and TiO 2 Raw material according to Li 2 ZnTi 3 o 8 The stoichiometric ratio ingredients were wet ball milled for 24 hours, dried and placed in an alumina crucible, and then the alumina crucible was placed in a high-temperature box-type electric furnace at 900 ° C for 4 hours to obtain Li 2 ZnTi 3 o 8 Powder;

[0040] The second step: the Li 2 CO 3 and TiO 2 Raw material according to Li 2 TiO 3 The stoichiometric ratio ingredients were wet ball milled for 12 hours, dried and placed in an alumina crucible, and then the alumina crucible was placed in a high-temperature box-type electric furnace at 920 ° C for 2 hours to obtain Li 2 TiO 3 Powder;

[0041] The third step: the ZnO, B 2 o 3 and SiO 2 The raw materials are dosed according to the composition requirements described in Table 1, and then dry milled in a planetary ball mill for 6 hours. The speed of the planetary ball mill is 350 rpm to obtain a mi...

Embodiment 3

[0049] Embodiment 3: the first step: with Li 2 CO 3 , ZnO and TiO 2 Raw material according to Li 2 ZnTi 3 o 8 The stoichiometric ratio ingredients were wet ball milled for 24 hours, dried and placed in an alumina crucible, and then the alumina crucible was placed in a high-temperature box-type electric furnace at 900 ° C for 4 hours to obtain Li 2 ZnTi 3 o 8 Powder;

[0050] The second step: the Li 2 CO 3 and TiO 2 Raw material according to Li 2 TiO 3 The stoichiometric ratio ingredients were wet ball milled for 12 hours, dried and placed in an alumina crucible, and then the alumina crucible was placed in a high-temperature box-type electric furnace at 920 ° C for 2 hours to obtain Li 2 TiO 3 Powder;

[0051] The third step: the ZnO, B 2 o 3 and SiO 2 The raw materials are dosed according to the composition requirements described in Table 1, and then dry milled in a planetary ball mill for 6 hours. The speed of the planetary ball mill is 350 rpm to obtain a mi...

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Abstract

The present invention discloses a low temperature sintering temperature-stable microwave dielectric ceramic material and a preparation method thereof. According to the present invention, the formula comprises a base material and a sintering auxiliary agent, wherein the chemical composition expression formula of the base material is (1-x)Li2ZnTi3O8-xLi2TiO3, x is more than or equal to 0.3 and is less than or equal to 0.6, the sintering auxiliary agent is ZnO-B2O3-SiO2 glass powder, the amount of the sintering auxiliary agent is a% of the weight of the base material, and a is more than or equal to 0.50 and is less than or equal to 1.25; the ceramic preparation process sequentially comprises: respectively pre-synthesizing Li2ZnTi3O8 powder and Li2TiO3 powder in a calcination manner, preparing a base material according to the molar ratio of the composition formula (1-x)Li2ZnTi3O8-xLi2TiO3, adding ZnO-B2O3-SiO2 glass powder, and carrying out ball milling, molding, molding agent removing and sintering to obtain the product; and the product sintering temperature can be reduced to below 950 DEG C, the relative dielectric constant [epsilon]r can be adjusted within 22-26, the quality factor Qf is up to 33500-61200 GHz, and the resonant frequency temperature coefficient [tau]f is -7.0-8.0 ppm/DEG C and is close to zero, such that the product can become a new LTCC material so as to be widely produced and continuously replace the existing material.

Description

technical field [0001] The invention belongs to the field of electronic ceramics and its preparation, in particular to a low-temperature sintering temperature-stable microwave dielectric ceramic material and a preparation method thereof. Background technique [0002] With the continuous development of electronic information technology in the direction of high frequency and digitalization, the requirements for miniaturization, integration and modularization of components are becoming increasingly urgent. Low Temperature Co-fired Ceramics (LTCC) technology is Electrical, mechanical, thermal, process characteristics, and high reliability have become one of the main technologies for electronic device modularization. LTCC technology requires microwave dielectric ceramics to be co-fired with Ag and Cu internal electrodes with high conductivity and low melting point. Therefore, low-temperature sintering of microwave dielectric ceramic materials has become a research hotspot. Altho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/622
Inventor 郑勇吕学鹏董作为
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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