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Microwave medium ceramic and preparation method thereof

A technology of microwave dielectric ceramics and structural formula, which is applied in the field of electronic information materials and components, can solve the problems of low quality factor, achieve the effect of no pollution to the environment and improve the dielectric properties

Active Publication Date: 2012-09-12
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above research found that by compounding some positive temperature coefficient materials and doping some oxides, the resonance frequency temperature coefficient of magnesium titanate can be adjusted and the sintering temperature can be reduced, but the quality factor is still not high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] According to 0.99 (Mg 0.99 co 0.01 TiO 3 )-0.01[(La 0.5 Li 0.5 )TiO 3 ] chemical ratio, weigh 19.163gMg(OH) 2 , 26.508g TiO 2 , 0.249g CoO and 19.303g La 2 o 3 , 4.377g Li 2 CO 3 , 18.927gTiO 2 , with the material ball water ratio of 1:1:2, add deionized water and agate balls, use planetary mill wet method for 6 hours (100r / min), dry at 80°C, pass through 80 mesh sieve, pass through Pre-burn at 900°C, keep warm for 2 hours, cool with the furnace, weigh the two powders after pre-burning, 39.442g (MgCo)TiO 3 and 0.558g (La 0.5 Li 0.5 )TiO 3 , put it into a ball mill tank for a second ball mill for 8 hours (the parameters of the same ball mill), after drying at 80°C, add 5% of the total powder mass of CMC as a binder, granulate and grind for 1 hour, and pass through a 40-mesh sieve. The powder is pressed into a cylindrical green body with a thickness of 5mm and a diameter of 13mm at a pressure of 2MPa, and the green body is sintered into porcelain at 1400°C ...

Embodiment 2

[0019] According to 0.97 (Mg 0.95 co 0.05 TiO 3 )-0.03[(La 0.5 Li 0.5 )TiO 3 ] chemical ratio, weigh 18.180gMg(OH) 2 , 26.207g TiO 2 , 1.229g CoO and 19.303g La 2 o 3 , 4.377g Li 2 CO 3 , 18.927gTiO 2 , with the material ball water ratio of 1:2:2, add deionized water and agate balls, use a planetary mill for wet ball milling for 6 hours (300r / min), dry at 80°C, pass through a 80-mesh sieve, and pass through a pre- Burn at 900°C, keep warm for 2 hours, cool with the furnace, weigh the two powders after pre-burning, 38.357g (MgCo)TiO 3 and 1.643g (La 0.5 Li 0.5 )TiO 3 , put it into a ball mill tank for secondary ball milling for 8 hours (100r / min, 1:3:4 ratio of material to water), after drying at 80°C, add CMC with 5% of the total mass of the powder as a binder, and granulate Grind for 1 hour, pass through a 40-mesh sieve, press the powder into a cylindrical green body with a thickness of 5 mm and a diameter of 13 mm at a pressure of 2 MPa, and sinter the green b...

Embodiment 3

[0021] According to 0.95 (Mg 0.95 Zn 0.05 TiO 3 )-0.05[(La 0.5 Li 0.5 )TiO 3 ] stoichiometric ratio, weigh 18.132gMg(OH) 2 , 26.137g TiO 2 , 1.332g ZnO and 19.303g La 2 o3 , 4.377g Li 2 CO 3 , 18.927gTiO 2 , with the material ball water ratio of 1:2:5, add deionized water and agate balls, use planetary mill wet method for 8 hours (200r / min), dry at 100°C, pass through 300 mesh sieve, Pre-burn at 1000°C, hold for 3 hours, cool with the furnace, weigh the two powders after pre-burning, 37.290g (MgZn)TiO 3 and 2.710g (La 0.5 Li 0.5 )TiO 3 , put it into the ball mill tank for secondary ball milling for 10 hours (300r / min, the parameters of other ball milling are the same ball milling), after drying, add PVB with 7% of the total mass of the powder as a binder, granulate and grind for 1 hour, pass 100-mesh sieve, the powder is pressed into a cylindrical green body with a thickness of 5mm and a diameter of 13mm, the pressure is 4MPa, the green body is sintered into porc...

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Abstract

The invention relates to a microwave medium ceramic and a preparation method thereof. The structural formula of the microwave medium ceramic is a(MgxMyTizO3)-b[(La0.5Li0.5)TiO3], wherein M refers to Co, Zn, Zr or Sb; x=0.9-1, y=0.01-0.1, z=0.9-0.1, and x+y+z=2; and a=0.9-0.99, b=0.1-0.01, and a+b=1. The preparation method comprises the following steps: weighing raw materials in a chemical ratio of MgxMyTizO3 to (La0.5Li0.5)TiO3, and ball-milling and drying to obtain powder with uniform particles; and pre-sintering the powder, mixing in a ratio of a:b of (0.9-0.99):(0.1-0.01), performing secondary ball milling, drying the mixed powder, adding an adhesive, granulating and grinding, sieving and pressing into a green body, and sintering the green body at high temperature to obtain the microwave medium ceramic. The magnesium titanate system microwave medium ceramic material has the dielectric constant of 15-25, the quality factor (Qf) of more than 200,000GHz and the near-zero temperature coefficient of resonance frequency tau f of -2ppm / DEG C, and the dielectric property of magnesium titanate ceramics is greatly improved.

Description

technical field [0001] The invention belongs to the field of electronic information materials and components, and is mainly used in microwave components such as resonators, filters, and dielectric antennas, and in particular relates to a magnesium titanate-based microwave dielectric ceramic with ultra-low loss and near-zero temperature coefficient and its Preparation. Background technique [0002] With the rapid development of modern communication technology, especially the development of mobile communication and satellite communication, microwave application frequency is developing towards higher frequency, temperature stable microwave dielectric ceramics with appropriate dielectric constant and extremely high quality factor As the basis for manufacturing microwave components, materials have received extensive attention. Magnesium titanate (MgTiO 3 ) Ceramic is an important microwave dielectric ceramic material, which has excellent microwave dielectric properties: dielect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/622H01B3/12
Inventor 张其土龚志杰王丽熙
Owner NANJING UNIV OF TECH
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