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 of ceramic powder has not been widely studied, and achieve time and energy cost saving, wide application, and production process The effect of environmental protection

Inactive Publication Date: 2013-05-22
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 dispersion 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, 7.25g of MgO, the mixed powder is put into a nylon tank, 150ml of deionized water and 150g of zirconium balls are added, and then ball milled on a planetary ball mill for 12 hours at a speed of 1000 rpm. After discharging, it is placed in a drying box 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 the material is discharged, it is placed in a drying box for drying at 120°C, paraffin is added for granulation, and sieved to 80 meshes, and then pressed into a green compact with a diameter of 10 mm and a height of 5 mm with a powder tablet machine at a pressure of 4 MPa. The green body was sintered at 1140°C for 4 hours to obtain microwave ...

Embodiment 2

[0025] According to microwave dielectric ceramic composition MgTiO 3 , Weigh TiO 2 14.38g, MgO7.25g ingredients, mixed powder into nylon

[0026] After adding 150ml of deionized water and 150g of zirconium balls to the tank, ball mill on a planetary ball mill for 12 hours at a speed of 1000 rpm. After discharging, it is placed in a drying box 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 (model 1788) powder, then add 150ml of deionized water and 150g of zirconium balls, then ball mill on a planetary ball mill for 12 hours at a speed of 1000 revolutions / Minute. After the material is discharged, it is placed in a drying box for drying at 120°C, and after sieving 80 meshes, it is then pressed into a green body with a diameter of 10mm and a height of 5mm with a powder tablet press at a pressure of 4MPa. The green body was sintered at 1140°C for 4 hours to ob...

Embodiment 3

[0028] According to microwave dielectric ceramic composition MgTiO 3 , Weigh TiO 2 7.99g, MgO4.03g ingredients, the mixed powder is put into a nylon tank, 150ml deionized water and 150g zirconium balls are added, and then ball milled on a planetary ball mill for 12 hours at a speed of 1000 rpm. After discharging, it is placed in a drying box 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 (model 1788) powder, then add 150ml of deionized water and 150g of zirconium balls, then ball mill on a planetary ball mill for 12 hours at a speed of 1000 revolutions / Minute. After the material is discharged, it is placed in a drying box for drying at 120°C, and after sieving 80 meshes, it is then pressed into a green body with a diameter of 10mm and a height of 5mm with a powder tablet press at a pressure of 4MPa. The green body was sintered at 1140°C for 4 hours to ob...

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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, and particularly relates to a medium-temperature sintered magnesium titanate-based microwave dielectric ceramic. Background technique [0002] Microwave application frequencies are developing to higher frequency bands. In the millimeter wave and submillimeter wave frequency bands, temperature-stable microwave dielectric ceramics with appropriate dielectric constant and extremely high quality factor 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 (160,000GHz), appropriate dielectric constant (17), but the sintering temperature is as high as 1450℃, and sintering The range is narrow. Researchers at home and abroad have done many studies to reduce MgTiO 3 The sintering temperature of the base cera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/462C04B35/622
Inventor 李玲霞丁响
Owner TIANJIN UNIV
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