Microwave dielectric ceramics with lower sintering temperature and preparation method thereof

A technology of microwave dielectric ceramics and sintering temperature, applied in the direction of ceramics, inorganic insulators, etc., can solve the problems of difficulty in obtaining uniform and dense microstructure, material performance degradation, and volatile components, etc., to improve microwave dielectric properties, Lower sintering temperature and simple preparation process

Inactive Publication Date: 2009-11-04
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, microwave dielectric ceramic materials are mostly prepared by conventional high-temperature solid-state reaction methods, and the sintering temperature reaches 1400°C-1600°C. Not only does the sintering time take a long time, it is difficult to obtain a uniform and dense microstructure, and the components are volatile, which makes the product deviate from the expected composition and form multiphase structures, leading to degradation and instability of material properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] According to microwave dielectric ceramic composition (Mg 1-x sn x )TiO 3 , where, x=0.03, weigh TiO 2 15.97g, MgO 7.82g, SnO 2 0.90g ingredients, according to raw materials, deionized water and ZrO 2 The weight ratio of the balls = 1:1:1.5 is added to the polyester tank, ball milled on a ball mill for 12 hours, and then placed in a drying oven to dry at 120°C after discharge; calcined in a high-temperature electric furnace at 1100°C for 4 hours to synthesize the precursor. Then press the precursor, deionized water and ZrO 2 Weight ratio of balls=1:1:1.5 ball milling for 24 hours, then drying at 100°C to obtain ceramic powder; adding 6% paraffin wax as a binder to the obtained ceramic powder for granulation, after Uniaxial molding at 200Mpa to make a green body with a diameter of 10mm and a height of 5mm; sintering in a high-temperature electric furnace. The temperature of the furnace is lowered to produce microwave dielectric ceramics.

Embodiment 2

[0021] According to microwave dielectric ceramic composition (Mg 1-x sn x )TiO 3 , where, x=0.03, weigh TiO 2 15.97g, MgO 7.82g, SnO 2 0.90g ingredients, according to raw materials, deionized water and ZrO 2 The weight ratio of the balls = 1:1:1.5 is added to the polyester tank, ball milled on a ball mill for 24 hours, and then dried in a drying oven at 120°C after discharge; calcined in a high-temperature electric furnace at 1100°C for 4 hours to synthesize the precursor. Then press the precursor, deionized water and ZrO 2 Weight ratio of balls=1:1:1.5 ball milling for 24 hours, then drying at 100°C to obtain ceramic powder; adding 6% paraffin wax as a binder to the obtained ceramic powder for granulation, after Uniaxial molding at 200Mpa to make a green body with a diameter of 10mm and a height of 5mm; sintering in a high-temperature electric furnace. The temperature of the furnace is lowered to produce microwave dielectric ceramics.

Embodiment 3

[0023] According to microwave dielectric ceramic composition (Mg 1-x sn x )TiO 3 , where, x=0.05, weigh TiO 2 15.97g, MgO 7.66g, SnO 2 1.51g ingredients, by raw material, deionized water and ZrO 2 The weight ratio of the balls = 1:1:1.5 is added to the polyester tank, ball milled on a ball mill for 12 hours, and then placed in a drying oven to dry at 120°C after discharge; calcined in a high-temperature electric furnace at 1100°C for 4 hours to synthesize the precursor. Then press the precursor, deionized water and ZrO 2 Weight ratio of balls=1:1:1.5 ball milling for 24 hours, then drying at 100°C to obtain ceramic powder; adding 6% paraffin wax as a binder to the obtained ceramic powder for granulation, after Uniaxial molding at 200Mpa to make a green body with a diameter of 10mm and a height of 5mm; sintering in a high-temperature electric furnace. The temperature of the furnace is lowered to produce microwave dielectric ceramics.

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Abstract

The invention discloses a microwave dielectric ceramics with lower sintering temperature, comprising the component of (Mg [1-x] Sn[X]) TiO3, wherein X ranges from 0.03 to 0.08, and the content of the raw materials according to molar percentage is as follows: 50 percent of TiO2, 40 to 50 percent of MgO and 0 to 10 percent of SnO2. The solid phase synthesis technology is adopted and includes the following steps: (1) material preparation; (2) calcination at 1100 DEG C, precursor synthesis, ball milling and drying; and (3) blank preparation and sintering at 1150 to 1250 DEG C. The invention uses Sn[2+] ion to partially replace Mg[2+] ion, thereby improving the microwave dielectric property of MgTiO3 ceramic, reducing the sintering temperature (1150 to 1250 DEG C)of the system, and realizing dense sintering at a lower temperature; and the preparation technology is simple, and the preparation process does not cause pollution.

Description

technical field [0001] The present invention relates to electronic information materials and components, in particular to a composition-based (Mg 1-x sn x )TiO 3 System of microwave dielectric ceramics. Background technique [0002] Microwave dielectric ceramics refer to ceramics that are used as dielectric materials in circuits in the microwave band (UHF, SHF band) and perform one or more functions. Dielectric resonators made of microwave functional ceramics are widely used in modern communication devices. Compared with traditional metal resonators, they have the advantages of small size, light weight, and low cost. With the continuous increase of the operating frequency of microwave wireless communication, the demand for new low-cost dielectric materials with extremely low loss and dielectric constant in the range of 10-20 is becoming increasingly urgent. [0003] At present, microwave dielectric ceramic materials are mostly prepared by conventional high-temperature so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/622H01B3/12
Inventor 李玲霞李国超张平王洪茹崔晨
Owner TIANJIN UNIV
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