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Microwave Dielectric Ceramics

A technology of microwave dielectric ceramics and conditions, applied in the direction of circuits, piezoelectric/electrostrictive/magnetostrictive devices, electrical components, etc., can solve the problems of high price and limited commercial application, and achieve low price and good microwave dielectric The effect of electrical performance and low price

Active Publication Date: 2017-10-24
PROSE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the rare earth oxide Nd 2 o 3 The price is relatively expensive, which limits the commercial application of this material to a certain extent

Method used

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preparation example Construction

[0020] The invention discloses a preparation method of microwave dielectric ceramics, which comprises the following steps:

[0021] (A) Put CaCO 3 , TiO 2 , La 2 O 3 , Sm 2 O 3 And Al 2 O 3 Ball milling, calcining after drying to obtain a ceramic body;

[0022] (B) The ceramic body is crushed and ball milled to obtain a powder;

[0023] (C) granulating the powder, dry pressing and forming to obtain a compressed tablet;

[0024] (D) Sintering the pressed sheet at 1350-1500°C to obtain microwave dielectric ceramics, the chemical composition of which is expressed by formula (I);

[0025] aCaCO 3 -bTiO 2 -cLa 2 O 3 -dSm 2 O 3 -eAl 2 O 3 (I);

[0026] 34mol%≤a≤42mol%, 36mol%≤b≤44mol%, 0mol%≤c≤16mol%, 0mol%≤d≤16mol%, 6mol%≤e≤14mol%; a+c+d=50mol%, b +e=50mol%.

[0027] In the present invention, the CaCO 3 , TiO 2 , La 2 O 3 , Sm 2 O 3 And Al 2 O 3 Ball milling, calcination after drying to obtain a ceramic body. The present invention has no special restrictions on ball milling, and it is prefer...

Embodiment 1

[0035] Take 0.41mol of CaCO 3 , 0.41mol TiO 2 , 0.09mol Sm 2 O 3 , 0.09mol of Al 2 O 3 , Calculate the quality of each analytically pure raw material required; put the accurately weighed raw materials into the ball mill tank; add alcohol and ZrO 2 Grinding ball, raw material, ZrO 2 The mass ratio of the grinding ball to the alcohol is 1:2:1.5; the ball is milled for 24 hours, mixed evenly, and the material is discharged, and it is dried at 100~120℃; then it is calcined at 1200℃ for 2 hours to synthesize the ceramic body. The above-mentioned ceramic body is crushed with a mortar and passed through a 40-mesh sieve, and then poured into a ball milling tank for secondary ball milling for 24 hours; the ratio of material: ball: alcohol remains unchanged; the material is discharged and the slurry is dried after drying. Mesh sieve to obtain powder.

[0036] Add 10wt% polyvinyl alcohol solution to the obtained powder for granulation and pass through a 40-mesh sieve, the concentration of th...

Embodiment 2～28

[0039] Referring to the method described in Example 1, according to different raw material ratios, microwave dielectric ceramics were prepared, and the raw material ratio and microwave dielectric performance parameters are shown in Table 1.

[0040] Table 1 Microwave dielectric performance parameters of microwave dielectric ceramics obtained in each embodiment

[0041]

[0042]

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PUM

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Abstract

The invention provides a microwave dielectric ceramic, the chemical composition expression of which is: aCaCO3-bTiO2-cLa2O3-dSm2O3-eAl2O3; wherein, 34mol%≤a≤42mol%, 36mol%≤b≤44mol%, 0mol%≤c≤16mol% %, 0mol%≤d≤16mol%, 6mol%≤e≤14mol%, a+c+d=50mol%, b+e=50mol%. The microwave dielectric ceramic of the present invention has low price and good microwave dielectric properties, and can be widely used in the preparation of microwave devices such as dielectric resonators, filters and duplexers with excellent performance, and meets the technical requirements of systems such as communication base stations.

Description

Technical field [0001] The invention relates to the field of functional ceramics, in particular to microwave dielectric ceramics. Background technique [0002] Microwave dielectric ceramics (MWDC) is a new type of functional electronic ceramics used as dielectric materials in microwave frequency circuits. It has the characteristics of high dielectric constant, low loss, and low frequency temperature coefficient. Microwave dielectric ceramics can be made into microwave components such as dielectric resonators, duplexers, dielectric filters, dielectric guided wave loops, etc., and are used in mobile communications, satellite communications, military radars and satellite positioning and navigation systems to meet antenna feed The need for high performance indicators such as miniaturization and low loss of the filter unit in the system. [0003] CaTiO with perovskite structure 3 -NdAlO 3 Series ceramic materials have excellent microwave dielectric properties: εr≈45, Q×f≥44000GHz, τf≈0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L41/187C04B35/465
Inventor 袁亮亮任海东成国权
Owner PROSE TECH CO LTD
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