CN103496971A

CN103496971A - Low temperature sintered microwave dielectric ceramic Ca4Bi6O13 and preparation method thereof

Info

Publication number: CN103496971A
Application number: CN201310458337.2A
Authority: CN
Inventors: 方亮; 蒋雪雯; 郭欢欢
Original assignee: Guilin University of Technology
Current assignee: Suzhou Hongwu Technology Intermediary Service Co.,Ltd.
Priority date: 2013-10-01
Filing date: 2013-10-01
Publication date: 2014-01-08
Anticipated expiration: 2033-10-01
Also published as: CN103496971B

Abstract

The invention discloses a low temperature sintered microwave dielectric ceramic Ca4Bi6O13 and a preparation method thereof. The chemical formula of the low temperature sintered microwave dielectric ceramic is Ca4Bi6O13. The preparation method comprises the following steps: (1) weighing and mixing original powder, with purity above 99.9%, of CaCO3 and Bi2O3 according to the chemical formula Ca4Bi6O13; (2) carrying out wet ball milling on the raw material mixture obtained in the step (1) for 12 hours and presintering the powder in an atmosphere at 700 DEG C for 6 hours after drying the powder, wherein the solvent is distilled water; (3) adding a binder to the powder prepared in the step (2) and then granulating the mixture, then carrying out compression forming and finally sintering the product in an atmosphere at 750-780 DEG C for 4 hours, wherein a polyvinyl alcohol solution with mass concentration of 5% is adopted as the binder and the dosage of the binder is 3% of the total mass of the powder. The prepared ceramic is well sintered at 750-780 DEG C, has dielectric constant of 15-16 and quality factor (Qf) as high as 84000-95000GHz, has low temperature coefficient of resonance frequency and has great application value in industry.

Description

Low temperature sintering microwave dielectric ceramic Ca 4bi 6o 13and preparation method thereof

Technical field

The present invention relates to dielectric ceramic material, particularly relate to microwave dielectric ceramic material of the microwave devices such as medium substrate, resonator and wave filter that use in microwave frequency and preparation method thereof.

Background technology

Microwave dielectric ceramic refers to and is applied in microwave frequency band (being mainly UHF, SHF frequency range) circuit as dielectric material and completes the pottery of one or more functions, be widely used as the components and parts such as resonator, wave filter, dielectric substrate and medium guided wave loop in modern communication, it is the key foundation material of modern communication technology, at aspects such as portable mobile phone, automobile telephone, cordless telephone, telestar susceptor and military radars, very important application is arranged, in the miniaturization of modern communication instrument, integrated process, just bringing into play increasing effect.

Be applied to the dielectric ceramic of microwave frequency band, should meet the requirement of following dielectric characteristics: (1) seriation DIELECTRIC CONSTANT ε _rto adapt to the requirement of different frequency and different application occasion; (2) high quality factor q value or dielectric loss tan δ are to reduce noise, and one requires Qf>=3000GHz; (3) the temperature factor τ of resonant frequency _fthe as far as possible little thermostability to guarantee that device has had, one requirement-10/ ℃≤τ _f≤+10ppm/ ℃.From late 1930s, just someone attempts dielectric substance is applied to microwave technology in the world.

According to relative permittivity ε _rsize from use the different of frequency range, usually the microwave dielectric ceramic be developed He developing can be divided into to 4 classes.

(1) ultralow dielectric microwave dielectric ceramic, main representative is Al ₂o ₃-TiO ₂, Y ₂baCuO ₅, MgAl ₂o ₄and Mg ₂siO ₄deng, its ε _r≤ 20, quality factor q * f>=50000GHz, τ _f≤ 10ppm/ ℃.Be mainly used in microwave base plate and high-end microwave device.

(2) low ε _rwith the microwave dielectric ceramic of high Q value, be mainly BaO-MgO-Ta ₂o ₅, BaO-ZnO-Ta ₂o ₅or BaO-MgO-Nb ₂o ₅, BaO-ZnO-Nb ₂o ₅system or the composite system MWDC material between them.Its ε _r=25～30, Q=(1～2) * 10 ⁴(under f>=10GHz), τ _f≈ 0.Be mainly used in the microwave communication equipments such as direct broadcasting satellite of f >=8GHz as the dielectric resonance device.

(3) medium ε _rwith the microwave dielectric ceramic of Q value, be mainly with BaTi ₄o ₉, Ba ₂ti ₉o ₂₀(Zr, Sn) TiO ₄deng the MWDC material that is base, its ε _r=35～40, Q=(6～9) * 10 ³(f=3～-4GHz under), τ _f≤ 5ppm/ ℃.Be mainly used in the interior microwave military radar of 4～8GHz range of frequency and communication system as the dielectric resonance device.

(4) high ε _rand the lower microwave dielectric ceramic of Q value is mainly used in civilian mobile communcations system in 0.8～4GHz range of frequency, this is also the emphasis of microwave dielectric ceramic research.Since the eighties, the people such as Kolar, Kato find and have studied perovskite-like tungsten bronze type BaO-Ln in succession ₂o ₃-TiO ₂series (Ln=La, Sm, Nd or Pr etc. are called for short BLT system), complex perovskite structure CaO-Li ₂o-Ln ₂o ₃-TiO ₂series, lead base series material, Ca _1-xln _2x/3tiO ₃be contour ε _rmicrowave dielectric ceramic, the wherein BaO-Nd of BLT system ₂o ₃-TiO ₂material dielectric constant reaches 90, lead base series (Pb, Ca) ZrO ₃specific inductivity reaches 105.

The sintering temperature of above these material systems one higher than 1300 ℃, can not be directly and the low melting point metals such as Ag and Cu burn altogether the formation laminated ceramic capacitor.In recent years, along with LTCC Technology (Low Temperature Co-fired Ceramics, the requirement of development LTCC) and the development of microwave multilayer device, researchist both domestic and external has carried out exploring widely and studying to some low fever's system materials, mainly to adopt devitrified glass or glass-ceramic composite system, because low melting glass has relatively high dielectric loss mutually, the existence of glassy phase has improved the dielectric loss of material greatly.Therefore development is the emphasis of current research without the low temperature sintering microwave dielectric ceramic of glassy phase, low temperature sintering high performance microwave media ceramic system is still very limited at present, and this has limited the development of low temperature co-fired technology and microwave multilayer device to a great extent.

Summary of the invention

The purpose of this invention is to provide a kind of have low-loss and good thermostability, microwave dielectric ceramic that sintering temperature is low simultaneously and preparation method thereof.

The chemical constitution of the low temperature sintering microwave dielectric ceramic the present invention relates to is: Ca ₄bi ₆o ₁₃.

Preparation method's concrete steps of described low temperature sintering microwave dielectric ceramic are:

(1) by purity, be the CaCO more than 99.9% ₃and Bi ₂o ₃starting powder press Ca ₄bi ₆o ₁₃the chemical formula weigh batching.

(2) by step (1) raw material mixing wet ball-milling 12 hours, solvent was distilled water, pre-burning 6 hours in 700 ℃ of air atmosphere after oven dry.

(3) after adding binding agent granulation in the powder made in step (2), then compression moulding, last sintering 4 hours in 750～780 ℃ of air atmosphere; Described binding agent adopts the polyvinyl alcohol solution that mass concentration is 5%, and dosage accounts for 3% of powder total mass.

Pottery prepared by the present invention is good at 750-780 ℃ of sintering, and its specific inductivity reaches 15～16, and quality factor q f value is up to 84000-95000GHz, and temperature coefficient of resonance frequency is little, industrial great using value is arranged.

Embodiment

Embodiment:

Table 1 shows 4 specific embodiments and the microwave dielectric property thereof that forms different sintering temperatures of the present invention.Its preparation method as mentioned above, carries out the evaluation of microwave dielectric property by the cylindrical dielectric resonator method.

The present invention never is limited to above embodiment.The bound of sintering temperature, interval value can realize the present invention, at this, do not enumerate embodiment.

This pottery can be widely used in the manufacture of the microwave devices such as various medium substrates, resonator and wave filter, can meet the Technology Need of the systems such as mobile communication, satellite communications.

Table 1:

Claims

1. but composite oxides, as the application of low-temperature sintered microwave dielectric ceramic, is characterized in that the chemical constitution formula of described composite oxides is: Ca ₄bi ₆o ₁₃;

Preparation method's concrete steps of described composite oxides are:

(1) by purity, be the CaCO more than 99.9% ₃and Bi ₂o ₃starting powder press Ca ₄bi ₆o ₁₃formula weigh batching;

(2) by step (1) raw material mixing wet ball-milling 12 hours, solvent was distilled water, pre-burning 6 hours in 700 ℃ of air atmosphere after oven dry;

(3) after adding binding agent granulation in the powder made in step (2), then compression moulding, last sintering 4 hours in 750 ~ 780 ℃ of air atmosphere; Described binding agent adopts the polyvinyl alcohol solution that mass concentration is 5%, and dosage accounts for 3% of powder total mass.