CN103496986A - Low temperature sintered microwave dielectric ceramic BiCa9V7O28 and preparation method thereof - Google Patents
Low temperature sintered microwave dielectric ceramic BiCa9V7O28 and preparation method thereof Download PDFInfo
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- CN103496986A CN103496986A CN201310459009.4A CN201310459009A CN103496986A CN 103496986 A CN103496986 A CN 103496986A CN 201310459009 A CN201310459009 A CN 201310459009A CN 103496986 A CN103496986 A CN 103496986A
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Abstract
The invention discloses a low temperature sintered microwave dielectric ceramic BiCa9V7O28 and a preparation method thereof. The chemical formula of the low temperature sintered microwave dielectric ceramic is BiCa9V7O28. The preparation method comprises the following steps: (1) weighing and mixing original powder, with purity above 99.9%, of Bi2O3, CaCO3 and V2O5 according to the chemical formula BiCa9V7O28; (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 780 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 850-880 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 850-880 DEG C, has dielectric constant of 17-18 and quality factor (Qf) as high as 81000-97000GHz, has low temperature coefficient of resonance frequency, can be co-sintered with Ag electrodes at low temperature and has great application value in industry.
Description
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, general requirement Qf>=3000 GHz; (3) the temperature factor τ of resonant frequency
?the as far as possible little thermostability to guarantee that device has had, general requirement-10/ ℃≤τ
?≤+10 ppm/ ℃.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
?≤ 10 ppm/ ° C.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>=10 GHz), τ
?≈ 0.Be mainly used in the microwave communication equipments such as direct broadcasting satellite of f >=8 GHz 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
?≤ 5 ppm/ ° C.Be mainly used in the interior microwave military radar of 4~8 GHz 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 is generally higher than 1300 ° of C, 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.We are to consisting of BiCa
9v
7o
28, BiBa
9v
7o
28and BiSr
9v
7o
28the vanadate pottery carried out the test of sintering characteristic and microwave dielectric property, found that BiCa
9v
7o
28can be at 850-880 ℃ of sintering, and there is excellent microwave dielectric property; BiBa
9v
7o
28and BiSr
9v
7o
2although 8 sintering temperatures are lower than 960 ℃, the microwave frequency band dielectric loss can not be used as microwave dielectric ceramic greatly.
Summary of the invention
The purpose of this invention is to provide a kind of have low-loss and good thermostability, sintering temperature is low, microwave dielectric ceramic that can be low temperature co-fired with Ag and preparation method thereof.
The chemical constitution of the low temperature sintering microwave dielectric ceramic the present invention relates to is: BiCa
9v
7o
28.
Preparation method's concrete steps of described low temperature sintering microwave dielectric ceramic are:
(1) by purity, be the Bi more than 99.9%
2o
3, CaCO
3and V
2o
5starting powder press BiCa
9v
7o
28the 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 780 ℃ 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 850 ~ 880 ℃ 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 850-880 ℃ of sintering, and its specific inductivity reaches 17~18, and quality factor q f value is up to 81000-97000GHz, and temperature coefficient of resonance frequency is little, can be low temperature co-fired with the Ag electrode, industrial great using value 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.By BiCa
9v
7o
28powder mixes with the Ag powder that accounts for powder quality 20%, after compression moulding, 880 ℃ of lower sintering 4 hours; X ray diffraction material phase analysis and scanning electron microscopic observation all show BiCa
9v
7o
28with Ag, chemical reaction, i.e. BiCa do not occur
9v
7o
28can be low temperature co-fired with the Ag electrode.
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)
1. but a vanadate, as the application of low-temperature sintered microwave dielectric ceramic, is characterized in that the chemical constitution formula of described vanadate is: BiCa
9v
7o
28;
Preparation method's concrete steps of described vanadate are:
(1) by purity, be the Bi more than 99.9%
2o
3, CaCO
3and V
2o
5starting powder press BiCa
9v
7o
28the 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 780 ℃ 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 850 ~ 880 ℃ 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.
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104311021A (en) * | 2014-10-13 | 2015-01-28 | 桂林理工大学 | Ultralow-dielectric-constant microwave dielectric ceramic and preparation method thereof |
CN104311018A (en) * | 2014-10-12 | 2015-01-28 | 桂林理工大学 | Ultralow-dielectric-constant microwave dielectric ceramic and preparation method thereof |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103113103A (en) * | 2013-03-22 | 2013-05-22 | 桂林理工大学 | Low temperature sintered microwave dielectric ceramic BiZn2VO6 and preparation method thereof |
-
2013
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Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103113103A (en) * | 2013-03-22 | 2013-05-22 | 桂林理工大学 | Low temperature sintered microwave dielectric ceramic BiZn2VO6 and preparation method thereof |
Non-Patent Citations (2)
Title |
---|
B.I.LAZORYAK ET AL.: "Ferroelectric and Ionic-Conductive Properties of Nonlinear-Optical Vanadate, Ca9Bi(VO4)7", 《CHEM. MATER.》, no. 15, 31 December 2003 (2003-12-31), pages 3003 - 3010 * |
J.S.O. EVANS ET AL.: "Synthesis and Structure of ACa9(VO4)7Compounds,A=Bi or a Rare Earth", 《JOURNAL OF SOLID STATE CHEMISTRY》, vol. 157, 31 December 2001 (2001-12-31), pages 255 - 260 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104311018A (en) * | 2014-10-12 | 2015-01-28 | 桂林理工大学 | Ultralow-dielectric-constant microwave dielectric ceramic and preparation method thereof |
CN104311018B (en) * | 2014-10-12 | 2016-05-18 | 桂林理工大学 | A kind of ultralow dielectric microwave dielectric ceramic and preparation method thereof |
CN104311021A (en) * | 2014-10-13 | 2015-01-28 | 桂林理工大学 | Ultralow-dielectric-constant microwave dielectric ceramic and preparation method thereof |
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