High-Q microwave dielectric ceramic material and preparing method thereof

A microwave dielectric ceramic, a new type of technology, applied in the direction of ceramics, inorganic insulators, etc., can solve the problems of high price, high sintering temperature, and restrictions on large-scale commercial application of materials, and achieve good performance stability and repeatability, and low production costs Effect

Inactive Publication Date: 2008-09-10
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the raw material Ta used in BZT and BMT 2 o 5 The price is expensive (2000 yuan / kg), and the sintering temperature is very high (1600°C, which limits the large-scale commercial application of this material

Method used

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  • High-Q microwave dielectric ceramic material and preparing method thereof
  • High-Q microwave dielectric ceramic material and preparing method thereof
  • High-Q microwave dielectric ceramic material and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment one: according to (1-x) Li 2 TiO 3 -xMgO (x=0~0.981) chemical equation, convert the mass of each raw material required, and then accurately weigh each analytical pure raw material: Li 2 CO 3 (99.9%), TiO 2 (97%), MgO (99.9%). The weighing quality is as follows: Table 1

[0020] Table 1. (1-x)Li 2 TiO 3 -xMgO ingredient list (unit: g):

[0021] x

MgO

Li 2 CO 3

TiO 2

0.0

0.0000

54.9619

58.3932

0.1

3.1395

52.8071

56.1039

0.24

5.2012

30.1959

32.7031

0.2

6.7340

50.3400

53.4828

0.3

10.8900

47.4877

50.4524

0.4

15.7501

44.1520

46.9085

0.5

21.5098

40.1989

42.7086

0.539

15.0350

23.5751

25.5325

0.645

20.0306

20.2116

21.8897

0.731

24.9998

16.8659

18.2663

0.803

...

Embodiment 2

[0026] Embodiment two: according to Li 2+x Ti 1-4x Nb 3x o 3 (x=0~0.10) chemical equation, convert the quality of each raw material required, and then accurately weigh each analytical pure raw material: Li 2 CO 3 (99.9%), TiO 2 (97%), Nb 2 o 5 (99.9%), as shown in Table 3:

[0027] Table 3.Li 2+x Ti 1-4x Nb 3x o 3 Ingredients list (unit: g):

[0028] x

Li 2 CO 3

TiO 2

Nb 2 o 5

0.00

53.9165

58.3932

0.0000

0.02

53.5367

52.8151

5.7205

0.04

53.1695

47.4222

11.2511

0.06

52.8143

42.2054

16.6011

0.07

39.4808

29.7453

14.4084

0.08

52.4705

37.1562

21.7793

0.10

52.1376

32.2666

26.7937

[0029] The material preparation process and testing method are the same as in Example 1. The results are shown in Table 4:

[0030] Table 4.Li 2+x Ti 1-4x Nb 3x o...

Embodiment 3

[0032] Embodiment three: according to Li 2+x TiO 3 (x=-0.85~0.20) chemical equation, convert the quality of each raw material required, and then accurately weigh each analytical pure raw material: Li 2CO 3 (99.9%), TiO 2 (97%), as shown in Table 5:

[0033] Table 5.Li 2+x TiO 3 (x=-0.85~0.20) Ingredients list (unit: g)

[0034] x

Li 2 CO 3

TiO 2

-0.85

19.3763

36.4957

-0.55

24.4309

36.4957

-0.25

29.4856

36.4957

0.01

33.8663

36.4957

0.02

34.0348

36.4957

0.03

34.2033

36.4957

0.04

34.3718

36.4957

0.05

34.5403

36.4957

0.06

34.7088

36.4957

0.07

34.8773

36.4957

0.08

35.0458

36.4957

0.12

35.7197

36.4957

0.16

36.3937

36.4957

0.20

37.0676

36.4957

[0035] The m...

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Abstract

The invention relates to a plurality of novel high-Q microwave medium ceramic materials and preparation methods thereof, belonging to the special ceramic material process technical field. The novel high-Q microwave medium ceramic materials comprise the following four chemical formulas: (1) (1-x)Li2TiO3-xMgO with x ranging between 0 and 0.981; (2) Li2+xTi1-4xNb3xO3 with x ranging from 0 and 0.1; (3) Li2+xTiO3 with x ranging between minus 0.85 and 0.20; (4) Li3Mg2NbO6. The preparation method comprises the following steps: according to the specified chemical formulas, the mass of each raw material is calculated; the raw material adopts chemical analytically pure with the purity of the raw materials including Li2CO3, TiO2, MgO and Nb2O5 more than 99 percent; the specified raw materials, zirconia grinding ball and dehydrated alcohol are packed in a resin ball milling tank according the to weight ratio of 1:2:0.75, and then are dried and screened after 24-hour ball milling; then, polyvinyl alcohol solution is added to carry out granulation and then the mixture is screened; particles are packed in a mould and are formed through dry stamp under 150 MPa pressure; and finally, blocks are calcined two hours under 1,200 DEG C to 1,350 DEG C to obtain the required high-Q microwave medium ceramic materials of rock-salt structures.

Description

Technical field: [0001] The invention relates to several novel high-Q microwave dielectric ceramic materials and a preparation method thereof, belonging to the technical field of special ceramic materials. Background technique: [0002] Microwave resonators and filters used in 3G and future 4G base stations must have good frequency selection characteristics, bandwidth, miniaturization and low cost. Although the original metal cavity resonator is cheap, the unloaded Q value of the metal cavity resonator is very low (~6000GHz) and the resonant frequency temperature stability is poor, while the dielectric resonator usually has a high unloaded quality factor, The frequency temperature coefficient is small, adjustable and miniaturized, so it is more and more widely used. The corresponding microwave dielectric material must have (1) high dielectric constant (20-50) (2) high quality factor (Qf>40000GHz) (3) near-zero adjustable resonant frequency temperature coefficient. Althou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/495C04B35/622H01B3/12
Inventor 卞建江董云飞袁亮亮李杨珍
Owner SHANGHAI UNIV
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