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Low temperature microwave medium ceramic materials without glass phase additions

A technology of microwave dielectric ceramics and glass phase, which is applied in the field of adding low-temperature microwave dielectric ceramic materials without glass phase, which can solve the problems of terminal electrode cracking and lower Q value of materials, etc.

Inactive Publication Date: 2010-07-14
SHANGHAI UNIV
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Problems solved by technology

But generally speaking, the introduction of impurity phases or sintering aids will always reduce the Q value of the material to varying degrees, and with the increase of the glass phase addition, especially when the glass phase addition exceeds 5%, due to the glass phase The thermal expansion coefficient is quite different from that of ceramics, and cracks will occur during the welding process of the terminal electrodes

Method used

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  • Low temperature microwave medium ceramic materials without glass phase additions
  • Low temperature microwave medium ceramic materials without glass phase additions
  • Low temperature microwave medium ceramic materials without glass phase additions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment one: according to LiY(W 1-x Te x ) 2 o 8 (x=0.05~0.20) 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%); Y 2 o 3 (99.9%); WO 3 (99%); TeO 2 (99.99%). The weighing quality is as follows: Table 1

[0024] Table 1LiY(W 1-x Te x ) 2 o 8 Ingredients list (unit: g)

[0025] x

Li 2 CO 3

Y 2 o 3

WO 3

TeO 2

0.05

6.3120

19.2897

75.9418

2.7242

0.10

6.3732

19.4766

72.6422

5.5013

0.15

6.4356

19.6672

69.2779

8.3327

[0026] x

Li 2 CO 3

Y 2 o 3

WO 3

TeO 2

0.20

6.4992

19.8616

65.8472

11.2202

[0027] Put the accurately weighed raw materials into the resin ball mill tank, add alcohol and ZrO 2 Grinding balls; the weight ratio of the three is: material: ball: alcoh...

Embodiment 2

[0031] Embodiment two: according to (1-x) LiYW 2 o 8 -xZnW 0.9 Te 0.1 o 4 (x=0.2~0.8) 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%); Y 2 o 3 (99.9%); WO 3 (99%); ZnO (99.6%) and TeO 2 (99.99%). The weighing quality is as follows: Table 3

[0032] Table 3(1-x)LiYW 2 o 8 -xZnW 0.9 Te 0.1 o 4 Ingredients list (unit: g)

[0033] x

Li 2 CO 3

Y 2 o 3

WO 3

ZnO

TeO 2

0.2

5.5327

16.9081

77.9522

3.0563

0.5969

0.4

4.6425

14.1877

76.4341

6.8388

1.3358

0.6

3.5123

10.7336

74.5068

11.6413

2.2738

0.8

2.0298

6.2031

71.9788

17.9405

3.5042

[0034] The material preparation process and testing method are the same as in Example 1. The results are shown in Table 4:

[0035] Table 4(1-x)LiYW 2 o 8 -xZ...

Embodiment 3

[0037] Embodiment three: according to (1-x)LiYW 2 o 8 -xSrWO 4 (x=0.2~0.8) 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%); Y 2 o 3 (99.9%); WO 3 (99%) and SrCO 3 (99.5%). The weighing quality is as follows: Table 5

[0038] Table 5(1-x)LiYW 2 o 8 -xSrWO 4 Ingredients list (unit: g)

[0039] x

Li 2 CO 3

Y 2 o 3

WO 3

SrCO 3

0.2

5.4757

16.7338

78.0153

5.4920

0.4

4.5368

13.8645

76.6082

12.1343

0.6

3.3783

10.3240

74.8720

20.3301

0.8

1.9128

5.8457

72.6758

30.6971

[0040] The material preparation process and testing method are the same as in Example 1. The results are shown in Table 6:

[0041] Table 6(1-x)LiYW 2 o 8 -xSrWO 4 (x=0.2~0.8)Microwave dielectric properties of materials

[0042]

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Abstract

The invention relates to several kinds of low temperature microwave medium ceramic materials without glass phase additions, belonging to the technical field of special ceramic material technology. The chemical general formulas of the ceramic materials are as follows: (1) LiY(W1-xTex)2O8, wherein x is 0.05-0.20; (2) (1-x)LiYW2O8-xZnW0.9Te0.1O4, wherein x is 0.2-0.8; (3) (1-x)LiYW2O8-xSrWO4, wherein x is 0.2-0.8; and (4) Ca1-xNaxWO4-delta, wherein x is 0.02-0.16. The preparation method comprises the following steps: weighting oxide raw materials according to a stoichiometric proportion to mix; placing the mixed materials in a resin mill pot to perform ball-milling for 24 hours, wherein the ratio of the mixed materials to balls and ethanol is 1:2:0.5; then discharging, drying, calcining at 700-800 DEG C to synthesize ceramic powder, adding polyving alcohol solution for pelleting; then grinding, performing secondary ball milling, discharging, drying, screening to obtain powder, adding polyving alcohol solution for continuous pelleting; then performing dry pressing under 150MPa for shaping; then bedding the obtained blocks in powder with the same components at 800-900 DEG C to sinter for 2 hours, and finally obtaining the low temperature microwave medium ceramic materials without glass phase additions.

Description

technical field [0001] The invention relates to several glass-free phase-added low-temperature microwave dielectric ceramic materials, belonging to the technical field of special ceramic materials. Background technique [0002] The popularization of mobile communication equipment puts forward higher requirements for the high integration, miniaturization, high reliability and low cost of microwave communication equipment. Since the wavelength of the electromagnetic wave in the dielectric waveguide is only (εr) in free space -1 / 2 , so the application of the dielectric waveguide can reduce the size of the waveguide element to the original (εr) -1 / 2 times. In addition, due to the existence of a complete magnetic interface at the beginning of the dielectric waveguide, radiation loss occurs, which can further reduce the size of the entire waveguide component. In a word, only the application of dielectric materials with good microwave dielectric properties can make the high inte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622C04B35/64
Inventor 卞建江汪亮孔秋东郭庆红梁柱
Owner SHANGHAI UNIV
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