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Composite microwave medium ceramic material

A technology of microwave dielectric ceramics and ceramics, applied in the field of dielectric ceramics, to achieve stable process, excellent microwave dielectric properties, and good reproducibility

Inactive Publication Date: 2008-04-23
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two ceramic materials, namely "M-phase" and Li 2 TiO 3 There is no similar report on the research of microwave dielectric properties such as the dielectric constant and other microwave dielectric properties by simple compounding of ss and ss materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In this experiment, high-purity Li 2 CO 3 , Nb 2 o 5 and TiO 2 raw material. The raw materials are mixed according to the chemical ratio of a=0.05, b=0.075; d=0.01 in the formula composition, and deionized water is added according to the weight ratio of the mixture and deionized water at 1:1.8, and mixed by wet ball milling for 24 ~36h, dry at 100~150°C, put them into high alumina crucibles respectively, pre-fire at 700°C~900°C for 5h~8h, and synthesize the required main crystal phases respectively. Mix the above-mentioned pre-synthesized powders at a molar ratio of 1:1, add alcohol according to the weight ratio of the mixture to alcohol at 1:1.2, and discharge the material after wet ball milling for 24h~36h, at 100~150℃ Drying, granulation with 4%-8% PVA, pressing into small discs under a pressure of 100-200MPa, debinding at 600-700°C. Undoped B 2 o 3 The ceramic sample is placed in an alumina crucible and sintered at 1000° C. to 1200° C. for 1 to 3 hours and n...

Embodiment 2

[0032] In this experiment, high-purity Li 2 CO 3 , Nb 2 o 5 and TiO 2 raw material. The raw materials were mixed according to the stoichiometric ratio of a=0.05, b=0.05; d=0.03, and the main crystal phases of the above compositions were respectively synthesized according to the preparation process described in Example 1. The above-mentioned pre-synthesized powders are mixed according to the molar ratio of 1:1, and the preparation process described in Example 1 is adopted to prepare the ceramic material of the above composition. The ceramic sample is to be tested after being ground on both sides by sandpaper. . Through the test of the microwave performance, the microwave dielectric properties of the composite ceramic material at different sintering temperatures are shown in Table 2, and the phase composition of the ceramic sheet sintered at 1100 ° C was identified by X-Ray (accompanying drawing 1 (b) The X-Ray diffractogram of the example 2 sample at 1100 ° C sintered cer...

Embodiment 3

[0036] In this experiment, high-purity Li 2 CO 3 , Nb 2 o 5 and TiO 2 raw material. The raw materials are mixed according to the chemical ratio of a=0.05, b=0.1; d=0.07, and the weight ratio of the mixture to the deionized water is 1:1.8, and the deionized water is added respectively, and the wet ball milling method is mixed for 24 to 36 hours. Dry at 100-150°C, put them into high-alumina crucibles respectively, and pre-fire at 700°C-900°C for 5h-8h to synthesize the required main crystal phases respectively. Mix the above-mentioned pre-synthesized powders at a molar ratio of 1:1, add alcohol according to the weight ratio of the mixture to alcohol at 1:1.2, and discharge the material after wet ball milling for 24h~36h, at 100~150℃ Drying, granulation with 4%-8% PVA, pressing into small discs under a pressure of 100-200MPa, debinding at 600-700°C. Undoped B 2 o 3 The ceramic sample is placed in an alumina crucible and sintered at 1000° C. to 1200° C. for 1 to 3 hours an...

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Abstract

This invention relates to a composite microwave medium ceramic material-Li2O-Nb2O5-TiO2 series material. It is composed of Li2TiO3 sosoloid (Li2TiO3ss phase) and M-phase sosoloid. The compositions are: xLi1+a-bNb1-a-3bTia+4bO3+(1-x)Li2+dNb3dTi1-4dO3, wherein: 0<x<1,0.05<a<0.2, 0<b<0.18,0<d<0.2; this inventive material is obtained by traditional preparation method. This inventive product has lower sintering temperature (1100deg.C), excellent microwave medium properties, adjustable dielectric constant (epsilon r=18-70), low resonant frequency temperature coefficient.

Description

technical field [0001] The invention relates to a composite microwave dielectric ceramic material, which belongs to the field of dielectric ceramics. Background technique [0002] In recent years, with the rapid development of mobile communication technology, the portability, miniaturization, high stability, chip type, and low cost of terminal equipment have become an inevitable trend of development. Among them, multilayer chip microwave devices, including multilayer filters, duplexers, chip antennas, etc., have been developed rapidly. The development of multilayer microwave devices also puts forward higher requirements for microwave dielectric ceramics. [0003] The multilayer chip formation of microwave components requires microwave dielectric materials to be co-fired with high-conductivity metal electrodes such as Pt, Pd, Au, Cu, Ag, etc. From the perspective of economy and environmental protection, Cu or Ag with high conductivity is generally used as the electrode mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/622H01B3/12
Inventor 曾群李蔚施剑林郭景坤
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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