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Y2O3-TiO2 series microwave dielectric ceramic and preparation method thereof

A microwave dielectric ceramic, Y2O325 technology, used in ceramics, inorganic insulators, etc., can solve the problems of complex phase composition and large dielectric loss, and achieve the effects of excellent dielectric properties, improved dielectric constant, and reduced relative excess.

Inactive Publication Date: 2008-05-21
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to propose a new type of Y in order to improve the problems of the existing medium dielectric microwave dielectric ceramics, such as large dielectric loss and complex phase composition. 2 o 3 -TiO 2 Microwave Dielectric Ceramics with Medium Permittivity

Method used

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  • Y2O3-TiO2 series microwave dielectric ceramic and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Composition as in Table 1 1 # Shown, specific preparation method comprises the following steps:

[0032] 1. Calculate the percentage by weight of the raw material according to the molar percentage (mol%) of the composition of the selected raw material, and then weigh the raw material.

[0033] ②Put the weighed sample in a ball mill jar and perform wet ball milling for 16 hours.

[0034] ③After the raw materials are dried, pre-fire at 1050°C in the atmosphere for 5 hours, the heating rate is 3.5°C / min, and then cool down with the furnace.

[0035] ④ Wet ball mill the pre-burned material on a planetary mill for 6 hours (300 rpm).

[0036] ⑤ Add PVA binder with a concentration of 7wt% according to the ratio of 7wt%, grind it in an agate mortar for about 1 hour to granulate, and pass through an 80-mesh sieve.

[0037] 6. Compress the powder mixed with 7wt% PVA into thin discs with a thickness of about 3 mm and a diameter of 13 mm with a powder tablet press, and the press...

Embodiment 2

[0042] Composition as in Table 1 2 # Shown, specific preparation method comprises the following steps:

[0043] 1. Calculate the percentage by weight of the raw material according to the molar percentage (mol%) of the composition of the selected raw material, and then weigh the raw material.

[0044] ②Put the weighed sample in a ball mill jar and perform wet ball milling for 18 hours.

[0045] ③ After the raw materials are dried, pre-fire at 1100°C for 3 hours in the atmosphere, with a heating rate of 3.5°C / min, and then cool down with the furnace.

[0046] ④ Wet ball mill the pre-burned material on a planetary mill for another 6 hours (300 rpm).

[0047] ⑤Add PVA binder with a concentration of 7wt% in the proportion of 8wt%, grind it in an agate mortar for about 1 hour to granulate, and pass through an 80-mesh sieve.

[0048] 6. Compress the powder mixed with 8wt% PVA into thin discs with a thickness of about 3 mm and a diameter of 13 mm with a powder tablet press, and the...

Embodiment 3

[0053] Composition as in Table 1 3 # Shown, specific preparation method comprises the following steps:

[0054] 1. Calculate the percentage by weight of the raw material according to the molar percentage (mol%) of the composition of the selected raw material, and then weigh the raw material.

[0055] ②Put the weighed sample in a ball mill jar and perform wet ball milling for 24 hours.

[0056] ③ After the raw materials are dried, pre-fire at 1200°C for 2 hours in the atmosphere, with a heating rate of 3.5°C / min, and then cool down with the furnace.

[0057] ④ Wet ball mill the pre-burned material on a planetary mill for 6 hours (300 rpm).

[0058] ⑤Add PVA binder with a concentration of 7wt% in the proportion of 7wt%, grind it in an agate mortar for about 3 hours to granulate, and pass through an 80-mesh sieve.

[0059] 6. Compress the powder mixed with 7wt% PYA into thin discs with a thickness of about 3 mm and a diameter of 13 mm with a powder tablet press, and the pressu...

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Abstract

The invention relates to a Y2O3-TiO2 series microwave dielectric ceramic and a preparation method thereof. The raw materials Y2O3, TiO2 and Bi2O3 are weighed in proportion, mixed, ball milled, dried, pre-fired, pressed and sintered to obtain microwave dielectric ceramics, the main crystal phase of which is Yi2Ti2O7 pyrochlore structure. The pure Y2O3-TiO2 system prepared by the present invention has good dielectric properties, and is a microwave medium with a relatively excellent dielectric constant; the sintering temperature of pure Y2O3-TiO2 microwave dielectric ceramics is significantly reduced after doping with Bi2O3, and the dielectric The electrical constant has been significantly improved, and the dielectric loss has been kept low.

Description

technical field [0001] The invention relates to a microwave dielectric ceramic with a medium dielectric constant and a preparation method thereof, which is mainly suitable for dielectric resonant devices of microwave military radar and communication systems; especially relates to a Y 2 o 3 -TiO 2 A microwave dielectric ceramic and a preparation method thereof. Background technique [0002] Designers of modern mobile communication and satellite communication systems focus on reducing the size of the circuit and improving its performance, which requires microwave dielectric ceramics to have a high dielectric constant εr and low dielectric loss. Medium dielectric constant microwave dielectric ceramics are mainly used in dielectric resonant devices of microwave military radar and communication systems. The basic performance requirements are: the dielectric constant is 30-80, and the dielectric loss is as low as possible. At present, people are paying more and more attention t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/46C04B35/622H01B3/12
Inventor 张其土陶婷婷
Owner NANJING UNIV OF TECH
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