Environment-friendly low-temperature sintered high-epsilon microwave dielectric ceramic and preparation method thereof

A technology of microwave dielectric ceramics and low-temperature sintering, applied in the field of microwave dielectric ceramics, can solve the problems of Pb being highly toxic, unable to meet the needs of environmental protection, and difficult to make casting slurry, etc., and achieve the effect of simple process and good reproducibility

Active Publication Date: 2012-07-18
JIAXING GLEAD ELECTRONICS CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

where V 2 o 5 1. Pb, the raw material of Pb-containing glass, is highly toxic and cannot meet the increasingly important environmental protection needs
In addition, B 2 o 3 and H 3 BO 3 It is easy to react with adhesives and dispersants in the casting formula, and it is not easy to make casting slurry

Method used

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  • Environment-friendly low-temperature sintered high-epsilon microwave dielectric ceramic and preparation method thereof
  • Environment-friendly low-temperature sintered high-epsilon microwave dielectric ceramic and preparation method thereof
  • Environment-friendly low-temperature sintered high-epsilon microwave dielectric ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] ①The analysis of pure lithium carbonate (Li 2 CO 3 ), niobium pentoxide (Nb 2 o 5 ), titanium dioxide (TiO 2 ) at 130 ℃ Press LiNb after 24 hours under-bake 0.6 Ti 0.5 o 3 (i.e. m=0.1, n=0.1) Weigh by chemical formula, mix the weighed powder in a horizontal ball mill for 24 hours according to the weight ratio of powder: industrial alcohol: zirconia balls: 1:1.7:5, After the uniformly mixed slurry was dried at 80°C, it was pre-fired in the atmosphere at 850°C for 4 hours to synthesize LiNb 0.6 Ti 0.5 o 3 , pre-fired LiNb 0.6 Ti 0.5 o 3 Sieve through a 40-mesh sieve.

[0028] ② will analyze pure zinc oxide (ZnO), niobium pentoxide (Nb 2 o 5 ) by ZnNb after baking at 130°C for 24 hours 2 o 6 Weigh by chemical formula, mix the weighed powder according to the weight ratio of powder: industrial alcohol: zirconia ball: 1:1.5:5, mix in a horizontal ball mill for 24 hours, and dry the evenly mixed slurry at 80°C After that, it was pre-fired in the atmosphere at...

Embodiment 2

[0035] ① According to the composition of Li 1.095 Nb 0.375 Ti 0.8 o 3 (m=0.1, n=0.175) through embodiment 1 step 1. synthetic Li 1.095 Nb 0.375 Ti 0.8 o 3 Binder.

[0036] ②According to the composition of ZnNb 2 o 6 Through embodiment 1 step 2. synthetic ZnNb 2 o 6 .

[0037] ③The synthesized Li 1.095 Nb 0.375 Ti 0.8 o 3 and ZnNb 2 o 6 and MnCO 3 , CuO, Bi 2 o 3 , Li 2 CO 3 Press Li 1.095 Nb 0.375 Ti 0.8 o 3 +awt%ZnNb 2 o 6 +bwt%MnCO 3 +cwt%CuO+dwt%Bi 2 o 3 +ewt%Li 2 CO 3 (See Table 2 for the specific formula.) After step ③ of Example 1, it is pressed into a round block, sintered in an air atmosphere at 900°C, and kept warm for 3 hours to obtain the ceramic material of the present invention.

[0038] The performance measurement method is the same as in Example 1, and the test results are shown in Table 2 (the test frequency is 3 GHz).

[0039] Table 2

[0040] serial number m n a b c d e Density (g / cm 3 ) ε r Qf(GHz)...

Embodiment 3

[0042] ① According to the composition of Li 1.025 Nb 0.675 Ti 0.4 o 3 (m=0.1, n=0.075) through embodiment 1 step 1. synthetic Li 1.025 Nb 0.675 Ti 0.4 o 3 .

[0043] ②The synthesized Li 1.025 Nb 0.675 Ti 0.4 o 3 and MnCO 3 , CuO, Bi 2 o 3 , Li 2 CO 3 Press Li 1.025 Nb 0.675 Ti 0.4 o 3 +bwt%MnCO 3 +cwt%CuO+dwt%Bi 2 o 3 +ewt%Li 2 CO 3 (See Table 3 for the specific formula.) After step ③ of Example 1, it is pressed into a round block, sintered in an air atmosphere at 900°C, and kept warm for 3 hours to obtain the ceramic material of the present invention.

[0044] The performance measurement method is the same as in Example 1, and the test results are shown in Table 3 (the test frequency is 3 GHz).

[0045] table 3

[0046] serial number m n a b c d e Density (g / cm 3 ) ε r Qf(GHz) τ f (ppm / °C) 8 0.1 0.075 0 1.5 1.5 0 2 4.15 70.15 3965 7 9 0.1 0.075 0 1.5 1 0.25 2 4.14 70.63 3840 8

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Abstract

The invention discloses an environment-friendly low-temperature sintered high-epsilon microwave dielectric ceramic which has the following formula: Li1+m-nNb1-m-3nTim+4nO3+awt%ZnNb2O6+bwt%MnCO3+cwt%CuO+dwt%Bi2O3+ewt%Li2CO3, wherein m is more than or equal to 0.05 and less than or equal to 0.2, n is more than or equal to 0.05 and less than or equal to 0.175, a is more than or equal to 0 but less than and equal to 10, b is more than or equal to 0 and less than or equal to 4, c is more than 0 and less than or equal to 4, d is more than or equal to 0 and less than or equal to 4, e is more than 0 and less than or equal to 6, and a, b, c, d and e are a mass fraction. In the formula, ZnNb2O3 is added to adjust the frequency temperature coefficient, so that the frequency temperature coefficient of the Li1+m-nNb1-m-3nTim+4nO3 ceramic approaches to zero; and the combined use of MnCO3, CuO, Bi2O3 and Li2O3 which conform to the environmental requirements can reduce the sintering temperature of the Li1+m-nNb1-m-3nTim+4nO3 ceramic to be below 900 DEG C, so as to achieve the effect of co-firing with a high electric conductivity silver electrode and also maintain excellent microwave dielectric property (epsilon is equal to 50 to 75, Qf is more than 4000 GHz). The ceramic material can be applied to manufacture high-pass filters, Baluns, Balun filters and other chip-type multilayer microwave ceramic elements in wireless communication.

Description

technical field [0001] The invention belongs to the field of microwave dielectric ceramics, in particular to an environment-friendly low-temperature sintered high dielectric constant microwave dielectric ceramic and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of microelectronic information technology, the needs of electronic complete machines in terms of miniaturization, portability, multi-function, digitization, high frequency, high reliability and high performance have pushed electronic components to miniaturization and integration. The direction of high-frequency and high-frequency development. Low Temperature Co-fired Ceramic (LTCC) technology has achieved design requirements such as small device size, compact structure, multi-functionality, and stable performance. It has become the mainstream technology of passive integration and the development direction of passive devices. And the economic growth point of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/462C04B35/622C04B35/63
Inventor 赵敏童建喜许赛卿唐春宝黄丹谭金刚张斌
Owner JIAXING GLEAD ELECTRONICS CO LTD
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