A kind of microwave dielectric ceramic powder and its preparation method

A microwave dielectric ceramic and powder technology is applied in the field of microwave dielectric ceramic powder and its preparation, which can solve the problems of high price, limited application and promotion, etc., and achieve the effects of low cost, improved microstructure and low loss.

Active Publication Date: 2015-11-25
CHONGQING YUNTIANHUA HIGH END NEW MATERIALS DEV CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It has also been reported that microwave ceramics with medium dielectric constant with excellent performance were prepared by using gallate as the main crystal phase, but a large amount of expensive gallium oxide is used as raw material in this system, which limits its application and promotion.

Method used

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  • A kind of microwave dielectric ceramic powder and its preparation method
  • A kind of microwave dielectric ceramic powder and its preparation method

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preparation example Construction

[0032] The present invention also provides a method for preparing the microwave dielectric ceramic powder, comprising: A) adding 95 to 100 parts by weight of (1-x)La(Mg 1 / 2 Ti 1 / 2 )O 3 -xCaTiO 3 It is mixed with 0-5 parts by weight of ZnO and ball-milled to obtain a microwave dielectric ceramic powder; wherein, x=0.35-0.45.

[0033] The (1-x)La(Mg 1 / 2 Ti 1 / 2 )O 3 -xCaTiO 3 The content of ZnO is the same as that described above, and will not be repeated here. The present invention has no special limitation on the sources of all raw materials, which can be commercially available or self-made.

[0034] The (1-x)La(Mg 1 / 2 Ti 1 / 2 )O 3 -xCaTiO 3 It is preferably prepared according to the following method: the molar ratio of the lanthanum-containing compound, the magnesium-containing compound, the titanium-containing compound and the calcium-containing compound according to the element lanthanum, magnesium, titanium and calcium is (1-x): 0.5 (1-x): [ 0.5(1-x)+x]:x ratio m...

Embodiment 1

[0045] 1.1 The molar ratio of lanthanum oxide, magnesium hydroxide, titanium oxide and calcium carbonate according to the element lanthanum, magnesium, titanium and calcium is (1-x): 0.5 (1-x): [0.5 (1-x) + x ]: mixed in the ratio of x, where x is 0.35, after mixing, add absolute ethanol as the medium to the ball mill jar for wet ball milling for 20 hours, then dry in an oven, keep at 1100°C for 6 hours to obtain ceramic powder 0.65La (Mg 1 / 2 Ti 1 / 2 )O 3 -0.35CaTiO 3 .

[0046] 1.2 The 0.65La (Mg 1 / 2 Ti 1 / 2 )O 3 -0.35CaTiO 3 Put it into a ball mill pot and use deionized water as the ball milling medium for ball milling for 22 hours, and dry in an oven to obtain a microwave dielectric ceramic powder.

Embodiment 2

[0048] 2.1 The molar ratio of lanthanum nitrate, magnesium oxide, titanium oxalate and calcium hydroxide according to the element lanthanum, magnesium, titanium and calcium is (1-x): 0.5 (1-x): [0.5 (1-x) + x ]: mixed in the ratio of x, where x is 0.38, after mixing, put deionized water as the medium into a ball mill tank for wet ball milling for 24 hours, then dry in an oven, and keep it at 1300°C for 1 hour to obtain ceramic powder 0.62La (Mg 1 / 2 Ti 1 / 2 )O 3 -0.38CaTiO 3 .

[0049] 2.2 The 0.62La (Mg 1 / 2 Ti 1 / 2 )O 3 -0.38CaTiO 3 It is mixed with 3 parts by weight of ZnO powder and added into a ball mill tank, using deionized water as the ball milling medium for ball milling for 22 hours, and dried in an oven to obtain a microwave dielectric ceramic powder.

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Abstract

The invention provides microwave dielectric ceramic powder and a preparation method thereof. The microwave dielectric ceramic powder comprises 95-100 parts by weight of (1-x)La(Mg1 / 2Ti1 / 2)O3-xCaTiO3 and 0-5 parts by weight of ZnO, wherein x is equal to 0.35-0.45. Compared with the existing microwave dielectric ceramic powder, the microwave dielectric ceramic powder combines the advantages of two material systems, namely CaTiO3 and La(Mg1 / 2Ti1 / 2)O3, so that the dielectric constant of the microwave dielectric ceramic powder is medium, the loss is lower, the quality factor is higher and the temperature coefficient of resonance frequency is adjustable. In particular, the density of the systems and the microstructure can be improved as a certain amount of zinc oxide is compounded, so that the loss of the microwave dielectric ceramic powder is lower and the quality factor is further improved. Moreover, the microwave dielectric ceramic powder is rich in raw material source, is widely applied and is lower in cost.

Description

technical field [0001] The invention belongs to the technical field of microwave components, and in particular relates to a microwave dielectric ceramic powder and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics refer to ceramics that are used as dielectric materials in microwave frequency circuits and perform one or more functions. It is a new type of functional ceramics that has developed rapidly in the past 30 years. Microwave devices such as duplexers, microwave dielectric antennas, dielectric frequency stabilized oscillators, and dielectric waveguide transmission lines. As a key material in microwave communication, the properties of microwave dielectric ceramics determine the performance of the overall modern communication technology system to a large extent. Therefore, the development of high-quality microwave dielectric ceramics is the key work of the entire microwave communication. [0003] For example, microwave dielectric ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/462C04B35/622
Inventor 雒文博杨晓战李在映刘明龙江林
Owner CHONGQING YUNTIANHUA HIGH END NEW MATERIALS DEV CO LTD
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