Dielectric adjustable material of ceramics and preparation method

A technology of ceramic materials and ceramic powders, applied in the field of ceramic materials and their preparation, can solve the problems of difficult to composite microwave devices, such as spatial impedance matching requirements, poor dielectric properties, and lowering the sintering temperature of BST ceramics, and achieves no toxic side effects, Environmental toxicity and side effects, low cost effect

CN100457678CInactive Publication Date: 2009-02-04TONGJI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2009-02-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

This invention relates to a method for preparing ceramic material with a sintering temperature below 950 deg.C. The ceramic material is composed of Ba1-xSrxTiO3 (x = 0.2 -0.6) 75.0-95.0 wt. %, MgO 0.15-15 wt. %, B2O3 0-1.0 wt. %, Li2CO3 3.0-10.0 wt. %. The method utilizes MgO and B2O3-Li2O sintering aid to dope and modify BST ceramic material, and the obtained ceramic material has such advantages as adjustable dielectric constant (100-2000) and low sintering temperature (850-950 deg.C). The ceramic material can be used in LTCC technique and microwave adjustable devices.
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Description

technical field

[0001] The invention belongs to the technical field of electronic materials and devices, and in particular relates to a ceramic material with a sintering temperature below 950°C and a preparation method thereof. Background technique

[0002] The rapid development of information technology urgently requires high-speed data and high current density transmission, and electronic circuits are increasingly developing in the direction of miniaturization, integration, and high frequency. This puts forward requirements for electronic components with small size, high frequency, high reliability, Low cost and high integration requirements. Low-temperature co-fired ceramics (LTCC) technology is to integrate components and circuits onto a multilayer ceramic substrate by printing, and then sinter at a low temperature to make the components stably embedded in the substrate structure, thereby achieving high component integration and product miniaturization. Purpose. [000...

Examples

Embodiment 1～3

[0042] Preparation of Ba 0.6 Sr 0.4 TiO 3 - MgO dielectric tunable ceramics:

[0043] Choose BaTiO 3 and SrTiO 3 (99.9%, 100nm, provided by Shandong Guoteng Functional Ceramic Material Co., Ltd.) as the main raw material, according to the ingredients of Ba:Sr=6:4 (molar ratio), the prepared raw materials are placed in a nylon ball mill jar, and zirconia balls are added Ball mill with absolute ethanol for 24 hours, pre-calcine at 1100°C for 4 hours after the discharge is dried, and Ba 0.6 Sr 0.4 TiO 3 The powder is ready for use.

[0044] Weigh the chemical reagents according to the following different component ratios:

[0045] experimental formula

[0046] Put the mixtures of the above formulas into nylon ball milling tanks respectively, add 20g of zirconia balls and 30g of absolute ethanol to ball mill for 24 hours, and pass through a 200-mesh sieve after drying. Polyvinyl alcohol (PVA) was used as a binder for granulation, and under a pressure of 10 MPa, ...