Ultra-low-loss lithium magnesium titanate microwave dielectric ceramic material and preparation method thereof

A technology of microwave dielectric ceramics and magnesium lithium titanate, which is applied in the field of electronic information materials and their devices, can solve the problems of increasing the dielectric loss of materials and being difficult to use, and achieves the effects of low cost, simple preparation method, and abundant raw materials

Active Publication Date: 2015-06-10
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although glass-ceramic materials can be sintered at lower temperatures, due to the introduction of a large amount of low-melting glass substances, the dielectric loss of the material is increased, and it is difficult to use at high frequencies.

Method used

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  • Ultra-low-loss lithium magnesium titanate microwave dielectric ceramic material and preparation method thereof
  • Ultra-low-loss lithium magnesium titanate microwave dielectric ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. Mixing

[0024] According to Li 2 Mg 3 TiO 6 The stoichiometric ratio, weigh the Li 2 CO 3 Powder 3.268g, MgO powder 5.243g, TiO 2 Powder 3.462g, the raw material and zirconia balls, absolute ethanol are packed in the ball mill tank with the mass ratio of 1:2:2, 360 rev / min fully mixed ball mill for 8 hours, and dried at 80~100°C for 12 hours.

[0025] 2. Pre-burning

[0026] Put the dried mixture in step 1 into an alumina crucible, raise the temperature to 1000°C at a heating rate of 2°C / min, and pre-fire at a constant temperature for 4 hours to prepare calcined powder.

[0027] 3. Secondary mixing

[0028] Put calcined powder, zirconia balls, and absolute ethanol in a mass ratio of 1:2:2 into a ball mill jar, mix thoroughly and ball mill for 8 hours, and dry at 80-100°C for 12 hours.

[0029] 4. Granulation and molding

[0030] Add its mass fraction to the calcined powder after step 3 drying and be 5% polyvinyl alcohol aqueous solution to granulate, cross ...

Embodiment 2

[0034] In Step 5 of Example 1, the cylindrical green body was sintered at 1260° C. for 6 hours, and other steps were the same as in Example 1 to obtain an ultra-low loss magnesium lithium titanate microwave dielectric ceramic material.

Embodiment 3

[0036] In Step 5 of Example 1, the cylindrical green body was sintered at 1300° C. for 6 hours, and other steps were the same as in Example 1 to obtain an ultra-low loss magnesium lithium titanate microwave dielectric ceramic material.

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Abstract

The invention discloses an ultra-low-loss lithium magnesium titanate microwave dielectric ceramic material and a preparation method thereof. A chemical component of the ceramic material is Li2Mg3TiO6; the dielectric loss is 0.000037-0.000048; Q*f is 123,000-152,000GHz; the dielectric constant is 14.5-15.5; the temperature coefficient of the resonance frequency is -42ppm / DEG C to -36ppm / DEG C; and the ultra-low-loss lithium magnesium titanate microwave dielectric ceramic material is prepared by a high-temperature solid reaction method. The microwave dielectric ceramic material is simple in preparation method, abundant in used raw material, low in cost, and beneficial to industrialized production; and the prepared microwave dielectric ceramic is stable in performance, can be used as a manufacturing material for an electronic circuit substrate, a dielectric resonator, a filter, a high-frequency satellite microwave device substrate and a microstrip line, and has important application prospect and economic value in the fields of electronic circuits, microwave mobile communication, satellite communication and radar systems.

Description

technical field [0001] The invention belongs to the technical field of electronic information materials and devices thereof, and in particular relates to an ultra-low loss magnesium lithium titanate microwave dielectric ceramic material and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics refer to ceramic materials used in microwave frequency (300MHz-300GHz) circuits as dielectric materials to complete one or more functions. Ideal microwave dielectric ceramics have a suitable dielectric constant (ε r ), a high quality factor (Q×f) (low dielectric loss) and a temperature coefficient of resonant frequency that tends to zero (τ f ). Components such as resonators, filters, and microwave integrated circuit substrates made of microwave dielectric ceramics have been widely used in modern communication technologies such as mobile communications, wireless local area networks, and military communications. In addition, as the operating freque...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/622
Inventor 刘鹏付志粉马建立赵小刚陈晓明李晶
Owner SHAANXI NORMAL UNIV
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