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A kind of 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: 2022-07-08
ZHEJIANG JIAKANG ELECTRONICS CO LTD
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  • Abstract
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  • Application Information

AI Technical Summary

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

Experimental program
Comparison scheme
Effect test

Embodiment 1-4 and comparative example 1

[0024] The composition expression of the microwave dielectric ceramic material in the present invention is: (1-x)Mg 2 TiO 4 -x[CaTiO 3 -yMO], where: 0≤x≤0.3, 0.1≤y≤0.2, MO is an auxiliary agent. The auxiliary MO is Yb 2 BaZnO 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. In Comparative Example 1, no auxiliary MO was added.

[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, firstly according to Mg 2 TiO 4 The molar ratio of Mg and Ti in the middle is to weigh magnesium oxide and titanium dioxide and mix them uniformly to obtain mixture I, and then according to CaTiO 3 -The molar ratio of Ca, Ti and MO in yMO Weigh titanium dioxide, calcium carbonate and MO additives and mix them un...

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Abstract

The invention discloses a microwave dielectric ceramic material with improved frequency temperature coefficient and a preparation method thereof, belonging 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], where: 0≤x≤0.3, 0.1≤y≤0.2, MO is an additive. When this material is prepared, CaTiO is first synthesized 3 ‑yMO, with its temperature coefficient of frequency compared to that of single-phase CaTiO 3 is improved; then with Mg 2 TiO 4 Two-phase compounding is performed. The dielectric constant of the microwave dielectric ceramic material of the invention is 18.5 to 24, the Q×f value is 40000 to 70000 GHz, and the frequency temperature coefficient |τ f(‑40℃→20℃) |+|τ f(20℃→135℃) |≤10ppm / ℃.

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 resonant frequency drift of material components with temperature, in ppm / ℃. The positive or negative value of the temperature coefficient of the resonant frequency does not represent the performance of the component, but it is the key to the stability of the component that the temperature coefficient of the resonant frequency is close to zero. τ f =[f(T 2 )-f(T 1 )] / f(T 0 ) / (T 2 -T 1 ), where f(T 2 ) is T 2 Resonant peak frequency at temperature point, f(T 1 ) is T 1 Resonant peak frequency at temperature point, f(T 0 ) is the resonant peak frequency at room temperature. In most cases, the resonant frequency o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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