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Temperature frequency characteristic regulator of microwave medium ceramic and LTCC material thereof

A technology of microwave dielectric ceramics and temperature-frequency characteristics, applied in the direction of silicate, alkaline earth metal silicate, printed circuit, etc., can solve the problems of low dielectric constant, device insulation resistance and reliability reduction, and achieve low dielectric constant, stable phase structure, and the effects of excellent microwave dielectric properties

Active Publication Date: 2017-07-07
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above defects or improvement needs of the prior art, the present invention provides a temperature-frequency characteristic regulator of microwave dielectric ceramic materials and a low-dielectric LTCC microwave dielectric ceramic prepared by the regulation of the regulator. The temperature-frequency characteristic regulator of dielectric ceramics regulates and modifies the resonant frequency temperature coefficient of LTCC microwave dielectric ceramics, and prepares a microwave dielectric ceramic with low dielectric constant, near-zero resonant frequency temperature coefficient and good reduction resistance. This solves the problem that the low-medium microwave dielectric ceramics in the prior art mainly rely on the addition of Ti-based materials as temperature-frequency characteristic regulators to regulate their τ f value, but the regulation of Ti-based materials makes the technical problem of device insulation resistance and reliability reduction in the preparation of MLCC devices

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  • Temperature frequency characteristic regulator of microwave medium ceramic and LTCC material thereof

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Embodiment 1～6

[0052] A microwave dielectric ceramic, its preparation method is carried out according to the following steps:

[0053] (1) Analytical pure BaCO 3 , SiO 2 After mixing according to the mole percentage ratio in Table 1, using zirconium balls as the medium and deionized water as the dispersant, the powder was mixed and stirred for 3 hours with a ball mill at a speed of 360 r / min; the obtained slurry was dried at 1100 Pre-fired at ℃ for 3 hours to obtain pre-fired ceramic powder;

[0054] (2) The pre-fired ceramic powder obtained in step (1) is subjected to wet ball milling again, and after drying, 3wt% polyvinyl alcohol (PVA) binder is added to the dry powder to granulate, and the powder is granulated under a pressure of 100MPa Press it into a cylindrical green sample with a thickness-to-diameter ratio of 0.4-0.6; after tableting, sinter in air or a reducing atmosphere at 1150-1250°C to obtain microwave dielectric ceramics or ceramics as described in Table 1. Temperature-freq...

Embodiment 7～11

[0060] A kind of LTCC microwave dielectric ceramic material, its preparation method is carried out according to the following steps:

[0061] (1) According to the chemical expression BaAl 2 Si 2 o 8 The stoichiometric ratio of BaCO 3 、Al 2 o 3 and SiO 2 , after mixing, use zirconium balls as the medium and deionized water as the dispersant, mix and stir the powder for 3 hours with a ball mill at a speed of 360r / min; dry the obtained slurry and pre-calcine at 1200°C for 3 hours to obtain pre-calcined ceramic powder;

[0062] (2) The calcined ceramic powder obtained in step (1), the microwave dielectric ceramic temperature-frequency characteristic regulator BaSi described in Examples 1 to 6, x o 2x+1 And sintering aid, the preferred sintering aid is LiF, after mixing according to the mass ratio y:(99-y):1, carry out wet ball milling treatment, after drying, add 3wt% polyvinyl alcohol (PVA) binder to dry The powder is granulated, and pressed under a pressure of 100 MPa i...

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Abstract

The invention discloses a microwave dielectric ceramic, a temperature frequency characteristic regulator of the microwave medium ceramic and an LTCC material thereof. The microwave dielectric ceramic comprises a principal crystalline phase. The chemical formula of the principal crystalline phase is BaSixO2(x+1)(x is greater than or equal to 1.56 but less than or equal to 1.85). The ceramic has a low dielectric constant (epsilon r is equal to 7.1-7.9), a relatively high quality factor (Q*f is equal to 10973-20350GHz) and a relatively wide sintering temperature (750-1250 DEG C). Meanwhile, the principle crystalline phase which is sintered in a reductive atmosphere N2-1vol%H2 still has an excellent microwave dielectric property and is the microwave dielectric material with good reduction resistance. The microwave dielectric material can be used as the temperature frequency characteristic regulator of the microwave medium ceramic and can keep a stable phase structure and a good microwave dielectric property (reduction resistance) in the reductive atmosphere. Compared with a conventional adjustor, the microwave dielectric ceramic has an obvious advantage and is a novel temperature frequency characteristic regulator which can be applied to BME-MLCC.

Description

technical field [0001] The invention belongs to the technical field of microwave dielectric ceramics, and more specifically relates to a microwave dielectric ceramic and can be used as an anti-reduction microwave ceramic temperature-frequency characteristic regulator and an LTCC material modified by the same. Background technique [0002] Microwave dielectric ceramics refer to ceramic materials used as dielectric materials in microwave frequency band (300MHz ~ 30GHz) circuits. As the operating frequency of communication equipment continues to increase, the signal delay phenomenon will become more obvious, the system loss and heat will also increase, and the system stability will gradually deteriorate. The low dielectric constant can reduce the interaction coupling loss between the material and the electrode, and increase the transmission rate of electrical signals. Therefore, research on microwave dielectric ceramics with low dielectric constant is particularly important. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/195C04B35/63C04B35/16
CPCC04B35/16C04B35/195C04B35/6303C04B2235/602C04B2235/656C04B2235/6562C04B2235/6567C04B2235/94C04B35/6261C04B35/62675C04B35/62685C04B2235/3203C04B2235/3215C04B2235/3436C04B2235/3481C04B2235/445C04B2235/652C04B2235/6582H05K1/0306C01B33/24
Inventor 雷文邹正雨吕文中宋小强陈泽皓汪小红范桂芬
Owner HUAZHONG UNIV OF SCI & TECH
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