CN104446467A - Na2O-MgO-V2O5 three-component low-temperature sintered microwave dielectric ceramic and preparation method thereof - Google Patents

Abstract

The invention discloses a Na2O-MgO-V2O5 three-component low-temperature sintered microwave dielectric ceramic. A preparation method of the microwave dielectric ceramic comprises the following steps: weighing and proportioning the original powder of Na2CO3, MgO and NH4VO3 with the purity being not less than 99% according to the composition of NaMg4V3O12; (2) ball-milling the raw materials weighed in the step (1) in a wet process by taking ethanol as a ball-milling medium and mixing for 4 hours, drying, and pre-sintering for 4 hours at the temperature of 680 DEG C in the atmosphere of air; (3) adding a binding agent into power prepared in the step (2), granulating, compression-molding, and finally sintering the ceramic for 4 hours at the temperature of 770-870 DEG C, wherein the binding agent is a polyvinyl alcohol solution with the mass concentration of 5%, and the addition amount of the binding agent is 7% of the total amount of the powder. The sintering temperature of the microwave dielectric ceramic disclosed by the invention is low and is not more than 870 DEG C, and the microwave dielectric ceramic has excellent microwave properties, wherein the dielectric constant epsilonr is 9-10, the Q*f value is up to 32,820GHz, and the tauf value is stable. The microwave dielectric ceramic can be used for manufacturing microwave devices such as LTCC resonators, antennas and filters.

Description

Na 2o-MgO-V 2o 5ternary can Temperature Firing Microwave Dielectric Ceramics and preparation method thereof

Technical field

The invention belongs to electronic ceramics and manufacture field thereof, relate to dielectric ceramic material of the microwave device such as medium substrate, antenna resonator used in microwave frequency and preparation method thereof.

Background technology

Microwave-medium ceramics refers to and is applied to as dielectric material in microwave frequency band (mainly UHF, SHF frequency range) circuit, and completes the pottery of one or more functions, is the class new function pottery developed rapidly over nearly 30 years.Microwave-medium ceramics not only can, as the insulated substrate in microwave circuit, also can be used for manufacturing the devices such as microwave dielectric filter resonator.

In recent years, along with microwave mobile communication technology is constantly to high frequency and digitizing future development, also more and more urgent to the requirement of component module.LTCC Technology (LTCC, Low Temperature Co-fired Ceramics) is one of major technique of electronic-component module.The gordian technique of LTCC require microwave dielectric material must excellent performance, there is low sintering temperature (≤900 DEG C) and compatibility can be burnt altogether with Ag electrode.Although current most microwave dielectric ceramic has excellent performance, its sintering temperature too high (>=1300 DEG C), as (Zr, Sn) TiO ₄, Ba (Zn _1/3ta _2/3) O ₃, Ba (Mg _1/3ta _2/3) O ₃deng, therefore cannot be applied on LTCC device.Therefore increasing research be placed on and explored that sintering temperature is low, excellent performance and can realize burning altogether on the material system of compatibility with Ag electrode.

In exploring early stage, we find, Na ₂o-MgO-V ₂o ₅ternary system compound N aMg ₄v ₃o ₁₂there is lower sintering temperature and excellent microwave dielectric property, the preparation of LTCC microwave base plate, wave filter and resonator can be widely used in, meet the technology needs of low-temp, co-fired ceramic multi-layer ceramic component.

Summary of the invention

The object of this invention is to provide the LTCC microwave dielectric ceramic materials and preparation method thereof of a kind of sintering temperature and low, excellent performance.

The chemical constitution formula of the microwave dielectric ceramic materials that the present invention relates to is: NaMg ₄v ₃o ₁₂.

Preparation method's concrete steps of microwave dielectric ceramic materials are:

(1) by the Na of purity>=99% ₂cO ₃, MgO and NH ₄vO ₃starting powder press NaMg ₄v ₃o ₁₂composition weigh batching;

(2) by step (1) raw material wet ball-milling mixing 4h, be ball-milling medium with ethanol, after drying under 680 DEG C of air atmospheres pre-burning 4h;

(3) make in powder in step (2) and add binding agent and after granulation, compression moulding, finally sinters porcelain at 770 ~ 870 DEG C, be incubated 4 hours; Described binding agent adopts mass concentration to be the polyvinyl alcohol solution of 5%, and dosage accounts for 7% of powder total amount.

Microwave-medium ceramics prepared by the present invention, its sintering temperature low (≤870 DEG C), microwave property is excellent: specific inductivity ( ε _r ) be 9 ~ 10, q × fbe worth up to 32820GHz and τ _f stable; Application prospect is had at the manufacture view of the microwave devices such as resonator, microwave antenna, wave filter.

Embodiment

embodiment 1:

Table 1 shows 6 specific embodiments and microwave dielectric property thereof that form different sintering temperature of the present invention.Its preparation method is described above, carries out the evaluation of microwave dielectric property by cylindrical dielectric resonator method.

This pottery can be widely used in the manufacture of the microwave devices such as LTCC medium substrate, resonator and wave filter, also holds out broad prospects in the systematic difference such as mobile communication and satellite communications.

Table 1:

Claims (1)

1. a Na ₂o-MgO-V ₂o ₅ternary can Temperature Firing Microwave Dielectric Ceramics, it is characterized in that the chemical constitution formula of this microwave dielectric ceramic materials is: NaMg ₄v ₃o ₁₂;

Preparation method's step of described microwave dielectric ceramic materials is:

(1) by the Na of purity>=99% ₂cO ₃, MgO and NH ₄vO ₃starting powder press NaMg ₄v ₃o ₁₂composition weigh batching;

(2) by step (1) raw material wet ball-milling mixing 4h, be ball-milling medium with ethanol, after drying under 680 DEG C of air atmospheres pre-burning 4h;

(3) make in powder in step (2) and add binding agent and after granulation, compression moulding, finally sinters porcelain at 770 ~ 870 DEG C, be incubated 4 hours; Described binding agent adopts mass concentration to be the polyvinyl alcohol solution of 5%, and dosage accounts for 7% of powder total amount.