Low-temperature sintered microwave dielectric ceramic and sintering method thereof

A microwave dielectric ceramic and low-temperature sintering technology, which is applied in the field of low-temperature sintering microwave dielectric ceramics and its sintering, can solve the problems of low-temperature sintering aid volatilization, affecting the compactness of ceramics, affecting performance, etc., to reduce pollution, improve production efficiency, and save energy. energy effect

Active Publication Date: 2012-01-18
GUANGXI NEW FUTURE INFORMATION IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sintering temperature of many microwave dielectric ceramics with excellent performance is very high, generally higher than the melting point of silver. Adding low melting point sintering aids to reduce the sintering temperature is the simplest and most practical way. The volatilization of sintering aids is serious, which affects the compactness of ceramics, affects the performance, and pollutes the environment

Method used

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  • Low-temperature sintered microwave dielectric ceramic and sintering method thereof
  • Low-temperature sintered microwave dielectric ceramic and sintering method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: Li 2 ZnTi 3 o 8 Microwave Sintering Method of Low Temperature Microwave Dielectric Ceramics

[0028] Specifically follow the steps below:

[0029] 1. First weigh the analytically pure raw material Li with a purity of more than 99%. 2 CO 3 1308.72g, ZnO 1447.66g and TiO 2 4243.62g, mixed to prepare the main powder.

[0030] 2. Add 7kg of deionized water to the main powder in step 1 and mix it with a wet ball mill for 4 hours. After drying, put the powder into the sintering bowl, put the sintering bowl into the cavity of the microwave sintering furnace and pre-sinter for 79 minutes. The firing temperature is 825°C, the heating rate is 15°C / min, the holding time is 25 minutes, and natural cooling, as attached figure 1 Medium microwave sintering curve a is shown.

[0031] 3. After pulverizing the calcined powder in step 2, add 18.73g B 2 o 3 , add 6238.6g of deionized water, mix again by wet ball milling for 4 hours, add 623.86g of polyvinyl alcohol s...

Embodiment 2

[0032] Example 2: Li 2 ZnTi 3 o 8 Microwave Sintering Method of Low Temperature Microwave Dielectric Ceramics

[0033] Specifically follow the steps below:

[0034] 1. First weigh the analytically pure raw material Li with a purity of more than 99%. 2 CO 3 1308.72g, ZnO 1447.66g and TiO 2 4243.62g, mixed and prepared into the main powder;

[0035] 2. Add the main powder in step 1 to 7kg of deionized water and mix it with a wet ball mill for 4 hours. After drying, put the powder into the sintering bowl, put the sintering bowl into the cavity of the microwave sintering furnace and pre-sinter for 80 minutes. The firing temperature is 850°C, the heating rate is 15°C / min, the holding time is 25 minutes, and it is naturally cooled.

[0036] 3. After pulverizing the calcined powder in step 2, add 126.94gV 2 o 5 , add 6346.8g of deionized water, mix again by wet ball milling for 4 hours, add 634.68g of polyvinyl alcohol solution with a mass concentration of 5% after drying,...

Embodiment 3

[0037] Example 3: Li 2 ZnTi 3 o 8 Microwave Sintering Method of Low Temperature Microwave Dielectric Ceramics

[0038] Specifically follow the steps below:

[0039] 1. First weigh the analytically pure raw material Li with a purity of more than 99%. 2 CO 3 1308.72g, ZnO 1447.66g and TiO 2 4243.62g, mixed and prepared into the main powder;

[0040] 2. Add 7kg of deionized water to the main powder in step 1, and mix it by wet ball milling for 6 hours. After drying, put the powder into the sintering bowl, put the sintering bowl into the cavity of the microwave sintering furnace and pre-sinter for 89 minutes. The pre-firing temperature is 900°C, the heating rate is 15°C / min, the holding time is 30 minutes, and it is naturally cooled.

[0041] 3. After pulverizing the calcined powder in step 2, add 62.83g of CuO, add 6282.7g of deionized water, mix again by wet ball milling for 6 hours, add 628.27g of polyvinyl alcohol solution with a mass concentration of 5% after drying,...

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Abstract

The invention discloses low-temperature sintered microwave dielectric ceramic and a sintering method thereof. The low-temperature sintered microwave dielectric ceramic comprises Li2MTi3O8 and N, wherein an M element is Zn, Ni, Co or Mg, and N is B2O3, V2O5, CuO or Bi2O3. The performance of a product prepared by adopting a microwave sintering method disclosed by the invention is superior to that of a traditional solid-phase sintered product, the high-frequency dielectric constant (epsilonr) of the product reaches 20 to 30, a Q*f value reaches up to 6000 to 59000GHz, and the temperature coefficient (tauf) of a resonance frequency is small. Moreover, the presintering time and the sintering time can be shortened, and the sintering temperature is decreased, so that the requirements of LTCC (Low Temperature Co-fired Ceramic) production can be met, the performance of the product is improved, energy sources are saved, the production cost is lowered, the low-temperature sintered microwave dielectric ceramic can be used for the manufacture of microwave devices, such as an LTCC system, a multilayer dielectric resonator, a microwave antenna, a filter and the like, the volatilization of low-melting-point substances is inhibited, the environment is protected, and the low-temperature sintered microwave dielectric ceramic has an important industrial application value.

Description

technical field [0001] The invention belongs to the technical field of electronic ceramic manufacturing technology, in particular to a low-temperature sintered microwave dielectric ceramic and a sintering method thereof. Background technique [0002] Low-temperature co-fired microwave dielectric ceramic materials are key basic materials for making components such as filters, resonators, dielectric substrates, and dielectric waveguide circuits. Because low-temperature co-fired microwave dielectric ceramics need to be co-fired with electrodes, silver electrodes have high conductivity and low cost, and are especially difficult to oxidize during co-firing. They are ideal electrode materials. Their melting point temperature is 961°C. higher than 900°C. [0003] Microwave sintering technology is a new type of material preparation technology. Its heating principle is that electromagnetic waves penetrate into the medium in the form of waves to cause dielectric loss and heat, rather...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/64
Inventor 褚冬进覃远东常宝成周军伟黄绍芬
Owner GUANGXI NEW FUTURE INFORMATION IND
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