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Medium-temperature sintered magnesium titanate-based microwave dielectric ceramics with high quality factor

A technology of microwave dielectric ceramics and high quality factor, which is applied in the field of magnesium titanate-based microwave dielectric ceramics, can solve the problems that the dispersion effect has not been widely studied, and achieve the effects of saving time and energy costs, environmental protection in the production process, and wide application

Inactive Publication Date: 2011-10-19
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyvinyl alcohol (PVA for short) is usually used as a binder to granulate ceramic powder, and its dispersing effect on ceramic powder during ball milling has not been widely studied.

Method used

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  • Medium-temperature sintered magnesium titanate-based microwave dielectric ceramics with high quality factor
  • Medium-temperature sintered magnesium titanate-based microwave dielectric ceramics with high quality factor
  • Medium-temperature sintered magnesium titanate-based microwave dielectric ceramics with high quality factor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] According to microwave dielectric ceramic composition MgTiO 3 , weigh TiO 2 14.38g, MgO 7.25g ingredients, the mixed powder was put into a nylon tank, after adding 150ml of deionized water and 150g of zirconium balls, ball milled on a planetary ball mill for 12 hours at a speed of 1000 rpm. After the material is discharged, it is placed in a drying oven for drying at 120°C and passed through a 40-mesh sieve, and the powder is calcined at 900°C for 2 hours. Weigh 6g of powder and place it in a nylon tank, then add 150ml of deionized water and 150g of zirconium balls, and then ball mill on a planetary ball mill for 12 hours at a speed of 1000 rpm. After discharging, place it in a drying oven to dry at 120°C, add paraffin to granulate, sieve through 80 meshes, and then use a powder tablet press with a pressure of 4 MPa to press into a green body with a diameter of 10 mm and a height of 5 mm. The green body was sintered at 1140°C for 4 hours to obtain microwave dielectric...

Embodiment 2

[0025] According to microwave dielectric ceramic composition MgTiO 3 , weigh TiO 2 14.38g, MgO 7.25g ingredients, mixed powder into nylon

[0026] In the jar, after adding the zirconium balls of 150ml deionized water and 150g, ball milled on a planetary ball mill for 12 hours, and the rotating speed was 1000 rpm. After the material is discharged, it is placed in a drying oven for drying at 120°C and passed through a 40-mesh sieve, and the powder is calcined at 900°C for 2 hours. Weigh 6g of powder and place it in a nylon tank, add 0.09g of PVA (type 1788) powder, then add 150ml of deionized water and 150g of zirconium balls, and mill on a planetary ball mill for 12 hours at a speed of 1000 rpm / Minute. After discharging, put it in a drying oven to dry at 120°C, and then sieve through 80 meshes, and press it into a green body with a diameter of 10 mm and a height of 5 mm with a powder tablet press at a pressure of 4 MPa. The green body was sintered at 1140°C for 4 hours to ...

Embodiment 3

[0028] According to microwave dielectric ceramic composition MgTiO 3 , weigh TiO 2 7.99g, MgO 4.03g ingredients, the mixed powder was put into a nylon tank, after adding 150ml of deionized water and 150g of zirconium balls, ball milled on a planetary ball mill for 12 hours at a speed of 1000 rpm. After the material is discharged, it is placed in a drying oven for drying at 120°C and passed through a 40-mesh sieve, and the powder is calcined at 900°C for 2 hours. Weigh 6g of powder and place it in a nylon tank, add 0.09g of PVA (type 1788) powder, then add 150ml of deionized water and 150g of zirconium balls, and mill on a planetary ball mill for 12 hours at a speed of 1000 rpm / Minute. After discharging, put it in a drying oven to dry at 120°C, and then sieve through 80 meshes, and press it into a green body with a diameter of 10 mm and a height of 5 mm with a powder tablet press at a pressure of 4 MPa. The green body was sintered at 1140°C for 4 hours to obtain microwave d...

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Abstract

The invention discloses a medium-temperature sintered magnesium titanate-based (MgTiO3-based) microwave dielectric ceramics with a high quality factor. Preparation steps for the magnesium titanate microwave dielectric ceramics comprise: (1) weighing MgO and TiO2 according to a stoichiometric ratio of the MgTiO3, and carrying out ball milling; (2) carrying out drying and sieving; (3) calcining the resulting mixture at a temperature below 900 DEG C; (4) adding polyvinyl alcohol, followed by carrying out secondary ball milling; (5) sequentially carrying out drying, sieving, pressing for shaping, followed by carrying out sintering at a temperature of 1120-1200 DEG C; (6) detecting physical property and dielectric property. With adding the polyvinyl alcohol and carrying out the secondary ball milling, the medium-temperature sintered (1140 DEG C) MgTiO3-based microwave dielectric ceramics with high quality factor is obtained, a disadvantage of the high sintering temperature (1450 DEG C) in the prior art is overcome, such that the MgTiO3-based microwave dielectric ceramics has advantages of wide application, low cost and environmental-protection production process so as to provide a ideal material for microwave millimeter wave communication devices.

Description

technical field [0001] The invention relates to electronic information materials and components, in particular to a medium-temperature sintered magnesium titanate-based microwave dielectric ceramic. Background technique [0002] The frequency of microwave applications is developing towards higher frequency bands. In the millimeter-wave and submillimeter-wave frequency bands, temperature-stable microwave dielectric ceramics with appropriate dielectric constants and extremely high quality factors are the basis for manufacturing millimeter-wave microwave passive devices. MgTiO 3 As a traditional microwave dielectric material, ceramics still have excellent microwave dielectric properties in the millimeter wave band: high quality factor (160,000 GHz), appropriate dielectric constant (17), but the sintering temperature is as high as 1450 ° C, and the sintering Narrow range. Researchers at home and abroad have done a lot of research in order to reduce the MgTiO 3 The sintering t...

Claims

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Application Information

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IPC IPC(8): C04B35/462C04B35/622
Inventor 李玲霞丁响
Owner TIANJIN UNIV
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