Low temperature sintered ZnO-MgO-TiO2 system microwave ceramic material and preparation thereof

A technology of microwave ceramics and low-temperature sintering, which is applied in the direction of ceramics and inorganic insulators, which can solve the problems of high cost, low insulation resistance, and large microwave loss, and achieve the effects of simple manufacturing process, high insulation resistivity, and stable dielectric constant

Inactive Publication Date: 2009-07-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Zhang.Q.L et al. published in Materials Letters in 2005 that the prepared ZnTiO 3 The dielectric constant of the system reaches 27, the Q*f value is about 20,000, and the resonant frequency temperature coefficient is 2ppm / ℃, but the insulation resistance is low, which limits its application range; Chinese invention patent application CN1793025A discloses a medium temperature 1000- ZnO-MgO-TiO sintered at 1100℃ 2 microwave dielectric ceramics, but the patent uses B 2 o 3 As a sintering aid, it is easy to cause abnormal changes in the properties of the medium slurry, which affects the casting and pressing properties of the slurry; in addition, the use of expensive and relatively high resistivity Ag 70 PD 30 Internal electrode material will lead to high cost and low quality factor of the device
[0004] At present, the sintering temperature of most commercial microwave dielectric ceramics is 1200-1500°C, such as BaTi 4 o 9 、Ba 2 Ti 9 o 20 , (Zn, Sn)TiO 4 , their sintering temperature is much higher than the melting point of Cu and Ag, and it is necessary to use expensive and high-resistance Ag when using such materials to prepare laminated devices. 70 PD 30 or Ag 35 PD 65 Electrode material, high cost, high microwave loss

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take by weighing 38.66g ZnO, 2.4g basic magnesium carbonate ((MgCO 3 ) 4 ·Mg(OH) 2 ·5H 2 O), 40gTiO 2 After mixing, add 0.081g of sodium dodecylbenzenesulfonate (0.1wt.%, relative to the total weight of raw materials, the same below), ball mill for 4 hours, pre-burn after drying, heat up from room temperature to 250°C in 30 minutes, and keep warm for 20 minutes. Heat up to 400°C for 30 minutes, hold for 30 minutes, heat up to 550°C for another 30 minutes, hold for 30 minutes, and then heat for 1 hour to 800°C, hold for 2 hours to synthesize a composition of 0.475ZnO-0.025MgO-0.5TiO 2 Pre-fired powder;

[0027] Then weigh 30g to form 0.475ZnO-0.05MgO-0.5TiO 2 Calcined powder, 3.762g TiO 2 , 0.506g3ZnO-B 2 o 3 (1.5wt.% relative to the total weight of raw materials), add 0.034g sodium dodecylbenzene sulfonate (0.1wt.%) after mixing, ball mill for 4 hours, and use 1ml weight concentration after drying to be 10% polyvinyl alcohol (PVA) solution is granulated and sha...

Embodiment 2

[0029] Take by weighing 36.62g ZnO, 4.8g basic magnesium carbonate ((MgCO 3 ) 4 ·Mg(OH) 2 ·5H 2 O), 40gTiO 2 After mixing, add 0.082g sodium dodecylbenzenesulfonate (0.1wt.%), ball mill for 4 hours, pre-fire after drying, heat up from room temperature to 250°C in 30min, keep warm for 20min, heat up to 400°C in 30min, keep warm for 30min, After another 30 minutes, the temperature was raised to 550°C, and the temperature was maintained for 30 minutes. After 1 hour, the temperature was increased to 800°C, and the temperature was maintained for 2 hours. The synthetic composition was 0.45ZnO-0.05MgO-0.5TiO 2 Pre-fired powder;

[0030] Then weigh 30g to form 0.45ZnO-0.05MgO-0.5TiO 2 Calcined powder, 3.762g TiO 2 , 2.363gZnO-B 2 o 3(7wt.%), add the sodium dodecylbenzenesulfonate (0.1wt.%) of 0.068g after mixing, ball mill 4 hours, be that 10% polyvinyl alcohol (PVA) solution makes with 1ml weight concentration after drying pellets, and finally sintered at 950°C for 4 hours t...

Embodiment 3

[0032] Weigh 51.29g ZnCO 3 2Zn(OH) 2 ·H 2 O, 4.8g magnesium basic carbonate ((MgCO 3 ) 4 ·Mg(OH) 2 ·5H 2 O), 40gTiO 2 After mixing, add 0.096g of sodium dodecylbenzenesulfonate (0.1wt.%), ball mill for 3 hours, pre-fire after drying, heat up from room temperature to 250°C in 60 minutes, keep warm for 30 minutes, heat up to 400°C in 40 minutes, and keep warm for 60 minutes , then heated up to 550°C for another 30 minutes, held for 30 minutes, and then heated to 800°C for 2 hours, held for 2 hours, and the synthetic composition was 0.45ZnO-0.05MgO-0.5TiO 2 Pre-fired powder;

[0033] Then weigh 30g to form 0.45ZnO-0.05MgO-0.5TiO 2 Calcined powder, 3.762g TiO 2 , 0.17g 2ZnO-3B 2 o 3 (0.5wt.%), after mixing, add 0.034g of sodium dodecylbenzenesulfonate (0.1wt.%), ball mill for 6 hours, and use 1ml weight concentration after drying to be 10% polyvinyl alcohol (PVA) solution Granulate and shape, and finally sinter at 975°C for 6 hours to obtain microwave dielectric cerami...

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Abstract

The invention discloses a low-temperature sintered ZnO-MgO-TiO2 system microwave ceramic material and a preparation method thereof. The formula of raw materials of the ceramic material comprises the following compositions: 30 to 45 percent of zinc oxide, 2 to 14 percent of magnesium oxide, 50 to 60 percent of titania and an auxiliary sintering agent. The preparation method comprises: taking the zinc oxide, basic magnesium carbonate and the titania as raw materials, mixing the raw materials, adding a grinding aid for ball milling, drying, sieving and presintering, and obtaining clinker; and mixing the obtained clinker with the titania, the auxiliary sintering agent and an additive, performing drying, granulation and press forming after secondary ball milling, finally sintering the mixture for 2 to 8 hours at a temperature of between 900 DEG C and 1,000 DEG C, and obtaining the ceramic material. The ceramic material prepared by the method has the advantages of superior microwave dielectric property, low sintering temperature, low cost and the like, and is suitable for microwave devices such as multi-layer ceramic capacitors, filters, resonators and dielectric antennas.

Description

technical field [0001] The invention relates to a ceramic material used in microwave electronic components and a manufacturing method thereof, in particular to a low-temperature sintered ZnO-MgO-TiO suitable for microwave devices such as high-performance microwave capacitors and filters. 2 System microwave dielectric ceramics and its preparation method. Background technique [0002] Microwave dielectric ceramics is a new type of functional electronic ceramics developed rapidly in the past 30 years. It has excellent properties such as moderate dielectric constant, low dielectric loss, and small temperature coefficient of resonance frequency, and is widely used in resonators, filters, dielectric substrates, and dielectric waveguide circuits. In recent years, with the rapid development of satellite communication and electronic technology, mobile communication equipment is developing in the direction of miniaturization, integration, high reliability, low cost, chip type, and en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/622H01B3/12
Inventor 吴松平焦丽江婵丁晓鸿倪晶
Owner SOUTH CHINA UNIV OF TECH
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