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Microwave dielectric material with improved frequency temperature coefficient and preparation method thereof

A technology of frequency temperature coefficient and microwave dielectric ceramics, which can be used in sustainable manufacturing/processing, climate sustainability, chemical industry, etc., and can solve problems such as excessive | values

Active Publication Date: 2021-10-26
ZHEJIANG JIAKANG ELECTRONICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For existing (1-x)Mg 2 TiO 4 -xCaTiO 3 The frequency temperature coefficient of the microwave dielectric material |τ f(T1℃→20℃) |+|τ f(20℃→T2℃) The shortcoming that the value is too large, the present invention provides a microwave dielectric ceramic material with improved frequency temperature coefficient, the material frequency temperature coefficient |τ f(-40℃→20℃) |+|τ f(20℃→135℃) |≤10ppm / ℃

Method used

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Examples

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Embodiment 1-4 and comparative example 1

[0024] In the present invention, the microwave dielectric ceramic material composition expression is: (1-x)Mg 2 TiO 4 -x[CaTiO 3 -yMO], wherein: 0≤x≤0.3, 0.1≤y≤0.2, MO is an additive. The auxiliary agent MO is Yb 2 CaZnO 5 , Mg 3 CoNb 2 o 9 、Nd 3 Ga 5 o 12 and SrAlLnO 4 one or more of them.

[0025] The specific compositions of Examples 1-4 and Comparative Example 1 are shown in Table 1. No additive MO was added in Comparative Example 1.

[0026] The preparation method of the microwave dielectric ceramic material is as follows:

[0027] (1) Ingredients: Using magnesium oxide, titanium dioxide, calcium carbonate and MO additives as raw materials, first according to Mg 2 TiO 4 The molar ratio of Mg and Ti in the medium weighs magnesium oxide and titanium dioxide and mixes them uniformly to obtain the mixture I, and then according to the CaTiO 3 -The molar ratio of Ca, Ti and MO in yMO Weigh titanium dioxide, calcium carbonate and MO additives and mix them uniform...

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Abstract

The invention discloses a microwave dielectric ceramic material with an improved frequency temperature coefficient and a preparation method thereof, and belongs to the technical field of microwave dielectric materials. The composition expression of the microwave dielectric ceramic material is (1-x)Mg[2]TiO[4]-x[CaTiO[3]-yMO], wherein x is greater than or equal to 0 and less than or equal to 0.3, y is greater than or equal to 0.1 and less than or equal to 0.2, and MO is an auxiliary agent. When the material is prepared, CaTiO[3]-yMO is firstly synthesized, so that the frequency temperature coefficient of the CaTiO[3]-yMO is improved compared with that of single-phase CaTiO[3]; and then two-phase compounding is carried out with Mg[2]TiO[4]. The dielectric constant of the microwave dielectric ceramic material is 18.5-24, the Q*f value is 40000-70000 GHz, and the frequency temperature coefficient abs([tau]f(-40 DEG C->20 DEG C))+abs([tau]f(20 DEG C->135 DEG C)) is less than or equal to 10 ppm / DEG C.

Description

technical field [0001] The invention relates to the technical field of microwave dielectric materials, in particular to a microwave dielectric material with improved frequency temperature coefficient and a preparation method thereof. Background technique [0002] Resonant frequency temperature coefficient τ f It is a parameter used to measure the degree of drift of the resonant frequency of a material component with temperature, and the unit is ppm / °C. The positive and negative value of the resonant frequency temperature coefficient does not mean the performance of the component is good or bad, but the resonant frequency temperature coefficient close to zero is the key to the stability of the component. τ f =[f(T 2 )-f(T 1 )] / f(T 0 ) / (T 2 -T 1 ), where f(T 2 ) for T 2 Resonant peak frequency at temperature point, f(T 1 ) for T 1 Resonant peak frequency at temperature point, f(T 0 ) is the resonant peak frequency at room temperature. In most cases, the resonant f...

Claims

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Application Information

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IPC IPC(8): C04B35/465C04B35/622C04B35/626
CPCC04B35/465C04B35/622C04B35/62605C04B2235/3206C04B2235/3208C04B2235/3236C04B2235/3224C04B2235/3215C04B2235/3284C04B2235/3275C04B2235/3251C04B2235/3286C04B2235/3213C04B2235/3217C04B2235/656C04B2235/6567C04B2235/96Y02P20/10
Inventor 吴伟杰陶锋烨
Owner ZHEJIANG JIAKANG ELECTRONICS CO LTD
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