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Microwave dielectric ceramic and preparation method thereof

A technology of microwave dielectric ceramics and ceramics, applied in the field of ceramic materials, can solve the problems of inability to meet the needs of 5G mobile communication applications, poor thermal shock resistance of microwave dielectric ceramics, weak product stability, etc. Thermal shock performance, the effect of excellent performance

Active Publication Date: 2021-06-11
无锡市高宇晟新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nowadays, for microwave dielectric ceramics with a dielectric constant εr of about 20, the system is currently mainly MgTiO3-CaTiO3 system, however , in the case of large temperature difference, the internal stress caused by uneven heat dissipation leads to poor thermal shock resistance of microwave dielectric ceramics
[0004]In the prior art, MgTiO3-CaTiO3 series microwave dielectric ceramic materials are Due to poor shock resistance and weak product stability, it has been unable to meet the needs of 5G mobile communication applications.

Method used

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preparation example Construction

[0067] According to a second aspect of the invention, a method of preparing a microwave medium ceramic comprising the steps of:

[0068] a) calcination ceramic material and modifier to obtain a powder after calcination;

[0069] b) mix the granulated powder after the calcination powder obtained by adding an adhesive to step a).

[0070] c) The granulated powder obtained by step b) is molded to obtain a blank;

[0071] d) Sintering the billet obtained by step c) to obtain a microwave medium ceramic.

[0072] The preparation method is MgO, CAO, TIO 2 Alone 2 O 3 The powder is mixed for the raw material to obtain a ceramic material, and then calcined after mixing with the modifier, the calcined powder and the binder are mixed, and the ball milling treatment, spray granulation, to obtain granulation powder And the blank pressures and sintering treatment are performed, and the microwave medium ceramic material is obtained. The preparation method is convenient and rapid, and the obtaine...

Embodiment 1

[0106] A microwave medium ceramic, including the following components according to the percentage of mass:

[0107] MGO 18%, CAO4%, TIO 2 57%, Al 2 O 3 20% and 1% of the modifier. Among them, the modifier is a first modifier, a second modifier, and a third modifier, the first modifier is SiO 2 The mass percentage of microwave medium ceramics is 0.5%; the second modifier is ZrO 2 The mass percentage of microwave medium ceramics is 0.3%; the third modifier is CEO 2 Its mass percentage of microwave medium ceramics is 0.2%.

[0108] The method of preparing the microwave medium ceramic of the present embodiment includes the steps of:

[0109] A: Weighing ceramic main material MgO18kg, cao4kg, TiO 2 57kg and al 2 O 3 20kg, weighing first modifier SIO 2 0.5kg, second modifier ZRO 2 0.3kg, third modifier CEO 2 0.2kg.

[0110] B: Ceramic designs of step A is designed MGO, CAO, TIO 2 , Al 2 O 3 , First modifier SIO 2 , Second modifier ZRO 2 And the third modifier CEO 2 Mixing, wet ball mill...

Embodiment 2

[0116] A microwave medium ceramic, including the following components according to the percentage of mass:

[0117] MGO 20%, CAO3.5%, TIO 2 56%, Al 2 O 3 19% and 1.5% modifier. Among them, the modifier is a first modifier, a second modifier, and a third modifier, the first modifier is SiO 2 The mass percentage of microwave medium ceramics is 1%; the second modifier is ZrO 2 The mass percentage of microwave medium ceramics is 0.3%; the third modifier is ND 2 O 3 Its mass percentage of microwave medium ceramics is 0.2%.

[0118] The method of preparing the microwave medium ceramic of the present embodiment includes the steps of:

[0119] A: Weighing ceramic main material MGO20kg, cao3.5kg, TiO 2 56kg and al 2 O 3 19kg, weighing the first modifier SIO 2 1kg, second modifier Zro 2 0.3kg, third modifier ND 2 O 3 0.2kg.

[0120] B: Ceramic designs of step A is designed MGO, CAO, TIO 2 , Al 2 O 3 , First modifier SIO 2 , Second modifier ZRO 2 And the third modifier ND 2 O 3 Mixing, wet b...

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Abstract

The present invention provides a microwave dielectric ceramic and a preparation method thereof, and relates to the technical field of ceramic materials. The microwave dielectric ceramic comprises the following components by mass: ceramic main materials: 15-30% of MgO, 2-4% of CaO, 45-65% of TiO2, 10-25% of Al2O3, and 1-4% of a modifier. The dielectric constant epsilon r of the microwave dielectric ceramic is 19-21, the quality factor Q x f is 50000-60000GHz, the temperature coefficient of resonance frequency tau f is-2 to 8ppm / DEG C, and the thermal shock temperature difference is 90-95 DEG C. Under the condition that the dielectric constant of the microwave dielectric ceramic is kept at about 20, the microwave dielectric ceramic still has a relatively high quality factor and relatively high thermal shock resistance.

Description

Technical field [0001] The present invention relates to the technical field of ceramic materials, and more particularly to a microwave medium ceramic and a preparation method thereof. Background technique [0002] At present, based on the rapid spread of 5G network, the resonator, filter, oscillator, phase shifter, capacitor, and microwave substrate, etc. have become a key material of communication, wherein the microwave medium ceramic material refers to a radio frequency element device. A key ceramic material of one or more functions is completed as a medium material of the medium microwave band circuit. [0003] The microwave medium ceramic material has begun to date from 1939 to the present, and the microwave medium ceramics of various low, medium and high, has achieved rapid development, and the variety of related systems have gradually matured and improved. Today, for dielectric constant ε r The microwave medium ceramics in 20, which is currently MGTIO. 3 -Catio 3 Series, ho...

Claims

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Application Information

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IPC IPC(8): C04B35/465C04B35/44C04B35/622C04B35/626
CPCC04B35/465C04B35/44C04B35/622C04B35/62605C04B2235/3206C04B2235/3208C04B2235/3236C04B2235/3217C04B2235/5436C04B2235/9607
Inventor 李礼黄庆焕叶荣王斌华顾国治
Owner 无锡市高宇晟新材料科技有限公司