CN106220147A - A kind of composite oxides NaAl3ca2sb2o12application as temperature-stable microwave dielectric ceramic - Google Patents

A kind of composite oxides NaAl3ca2sb2o12application as temperature-stable microwave dielectric ceramic Download PDF

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CN106220147A
CN106220147A CN201610624985.4A CN201610624985A CN106220147A CN 106220147 A CN106220147 A CN 106220147A CN 201610624985 A CN201610624985 A CN 201610624985A CN 106220147 A CN106220147 A CN 106220147A
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苏聪学
梁文英
李纯纯
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Guilin University of Technology
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Abstract

The invention discloses a kind of composite oxides NaAl3Ca2Sb2O12Application as temperature-stable ultralow dielectric microwave dielectric ceramic and preparation method thereof.(1) by chemical raw material Na2CO3、Al2O3、CaCO3And Sb2O5Powder stoichiometrically formula NaAl3Ca2Sb2O12Weigh dispensing；(2) by step (1) raw material wet ball-milling mix 12 hours, ball-milling medium is distilled water, after drying in 1100 DEG C of air atmosphere pre-burning 6 hours；(3) after adding binding agent pelletize in the powder that step (2) prepares, re-compacted molding, finally sinter 4 hours in 1150～1200 DEG C of air atmosphere；Described binding agent uses mass concentration to be the poly-vinyl alcohol solution of 5%, and the addition of polyvinyl alcohol accounts for the 3% of powder gross mass.Pottery prepared by the present invention sinters well below 1200 DEG C, and dielectric constant reaches 8.4～8.9, and its quality factor q f value is up to 77100 88400GHz, and temperature coefficient of resonance frequency is little, industrially has great using value.

Description

A kind of composite oxides NaAl3Ca2Sb2O12As temperature-stable microwave dielectric ceramic Application
Technical field
The present invention relates to dielectric ceramic material, particularly relate to for manufacturing ceramic substrate, the resonance that microwave frequency uses Dielectric ceramic materials of microwave device such as device and wave filter and preparation method thereof.
Background technology
Microwave dielectric ceramic refers to be applied in microwave frequency band (mainly UHF and SHF frequency range) circuit as dielectric material And complete the pottery of one or more functions, modern communication is widely used as resonator, wave filter, dielectric substrate and medium The components and parts such as wave circuit, are the key foundation materials of modern communication technology, in portable mobile phone, automobile telephone, nothing The aspect such as rope phone, television satellite accepter and military radar has highly important application, small-sized at modern communication instrument Change, integrated during just playing increasing effect.
It is applied to the dielectric ceramic of microwave frequency band, should meet the requirement of following dielectric property: (1) seriation DIELECTRIC CONSTANT εr To adapt to different frequency and the requirement of different application occasion；(2) high quality factor q value or low dielectric loss tan δ are to reduce Noise, typically requires Qf >=3000GHz；(3) the temperature coefficient τ of resonant frequencyfThe least to ensure the heat that device has had Stability ,-10ppm/ DEG C≤τ of general requirementf≤+10ppm/℃.Just have tried to electricity from late 1930s in the world Dielectric material is applied to microwave technology, and prepares TiO2Microwave dielectric filter, but its temperature coefficient of resonance frequency τfToo big and Cannot be practical.Since the seventies in last century, start the large-scale development to medium ceramic material, according to being relatively situated between Electric constant εrSize different from use frequency range, generally can will have been developed that and the microwave-medium ceramics developed be divided into 4 Class.
(1) ultralow dielectric microwave dielectric ceramic, main representative is Al2O3-TiO2、Y2BaCuO5、MgAl2O4With Mg2SiO4Deng, its εr≤ 20, quality factor q × f >=50000GHz, τf≤10ppm/℃.It is mainly used in microwave base plate and height End microwave device.
(2) low εrWith the microwave dielectric ceramic of high q-factor, mainly BaO-MgO-Ta2O5,BaO-ZnO-Ta2O5Or BaO- MgO-Nb2O5,BaO-ZnO-Nb2O5System or the hybrid system MWDC material between them.Its εr=20～35, Q=(1～2) ×104(under f >=10GHz), τf≈0.In the microwave communication equipments such as the direct broadcasting satellite being mainly used in f >=8GHz humorous as medium Shake device.
(3) medium εrWith the microwave dielectric ceramic of Q-value, it is mainly with BaTi4O9、Ba2Ti9O20(Zr, Sn) TiO4Etc. for The MWDC material of base, its εr=35～45, Q=(6～9) × 103(under f=3～-4GHz), τf≤5ppm/℃.Main use As dielectric resonance device in microwave military radar in 4～8GHz frequency ranges and communication system.
(4) high εrAnd the microwave dielectric ceramic that Q-value is relatively low, in being mainly used in 0.8～4GHz frequency range, civilian movement is led to News system, this is also the emphasis of microwave dielectric ceramic research.Since the eighties, Kolar, Kato et al. in succession find and have studied Perovskite-like tungsten bronze type BaO Ln2O3—TiO2Series (Ln=La, Sm, Nd or Pr etc. are called for short BLT system), composite perofskite Structure C aO Li2O—Ln2O3—TiO2Series, lead base series material, Ca1-xLn2x/3TiO3It is contour εrMicrowave dielectric ceramic, The wherein BaO Nd of BLT system2O3—TiO2Material dielectric constant reaches 90, lead base series (Pb, Ca) ZrO3Dielectric constant reaches To 105.
Three performance indications (ε due to microwave dielectric ceramicrWith Q f and τfIt is that the relation of mutually restriction is (see literary composition between) Offer: the restricting relation between microwave dielectric ceramic materials dielectric properties, Zhu Jianhua, Liang Fei, Wang little Hong, Lv Wenzhong, electronic component with Material, phase March the 3rd in 2005), meet three performance requirements and the single-phase microwave-medium ceramics of low temperature sintering is considerably less, main Cannot application request if their temperature coefficient of resonance frequency is the most excessive or quality factor are on the low side.At present to micro- The research major part of ripple media ceramic is the summary of experience drawn by great many of experiments, does not but have complete theory micro-to illustrate See the relation of structure and dielectric properties, therefore, the most also cannot predict its resonance frequency from the composition of compound with structure The microwave dielectric properties such as rate temperature coefficient and quality factor, which greatly limits low temperature co-fired technology and microwave multilamellar The development of device.Explore and low-temperature sintering can have near-zero resonance frequency temperature coefficient (-10ppm/ DEG C≤τ with exploitation simultaneouslyf≤ + 10ppm/ DEG C) it is that those skilled in the art thirst for solving always but are difficult to all the time with the microwave dielectric ceramic of higher figure of merit The difficult problem succeeded.We are to non-garnet structure, and consist of NaAl3Ca2Sb2O12、NaAl3Ca2V2O12With NaAl3Ca2Nb2O12Pottery carried out sintering and Study on microwave dielectric property, find their sintering temperature less than 1200 DEG C, But only NaAl3Ca2Sb2O12There is near-zero resonance frequency temperature coefficient and high quality factor, NaAl3Ca2Nb2O12For quasiconductor, Microwave frequency band dielectric loss too big and cannot as can be practical microwave-medium ceramics, NaAl3Ca2V2O12Resonant frequency Temperature coefficient is-64ppm/ DEG C, also cannot be as practical microwave-medium ceramics.
Summary of the invention
It is an object of the invention to provide and a kind of have good heat stability and low-loss, low temperature sintering is ultralow simultaneously Dielectric constant microwave dielectric ceramic material and preparation method thereof.
The chemical composition of the microwave dielectric ceramic material of the present invention is NaAl3Ca2Sb2O12。
The preparation method step of this microwave dielectric ceramic material is:
(1) by chemical raw material Na2CO3、Al2O3、CaCO3And Sb2O5Powder stoichiometrically formula NaAl3Ca2Sb2O12Weigh Dispensing.
(2) being mixed 12 hours by step (1) raw material wet ball-milling, ball-milling medium is distilled water, big at 1100 DEG C after drying Pre-burning 6 hours in gas atmosphere.
(3) after adding binding agent pelletize in the powder that step (2) prepares, re-compacted molding, finally 1150～ 1200 DEG C of air atmosphere sinter 4 hours；Described binding agent uses mass concentration to be the poly-vinyl alcohol solution of 5%, polyethylene Alcohol addition accounts for the 3% of powder gross mass.
Advantages of the present invention: NaAl3Ca2Sb2O12Ceramic sintering temperature is low, and cost of material is low；Its quality factor q f value is up to 77100-88400GHz, dielectric constant reaches 8.4～8.9, the temperature coefficient τ of its resonant frequencyfLittle, temperature stability is good；Can It is widely used in the manufacture of the microwave devices such as various medium substrate, resonator and wave filter, low temperature co-fired technology and microwave can be met The technology of multilayer device needs.
Detailed description of the invention
Embodiment:
Table 1 shows 3 specific embodiments and the microwave dielectric property thereof of the different sintering temperatures constituting the present invention.Its system Preparation Method as it has been described above, carry out the evaluation of microwave dielectric property by cylindrical dielectric resonator method.
This pottery can be widely used for the manufacture of the microwave devices such as various medium substrate, resonator and wave filter, can meet shifting The technology of the systems such as dynamic communication and satellite communication needs.
Table 1:

Claims (1)

1. composite oxides are as the application of temperature-stable ultralow dielectric microwave dielectric ceramic, it is characterised in that institute The chemical composition stating composite oxides is: NaAl3Ca2Sb2O12, its dielectric constant is 8.4～8.9, temperature coefficient of resonance frequency For-10ppm/ DEG C；
The preparation method of described composite oxides concretely comprises the following steps:
(1) by chemical raw material Na2CO3、Al2O3、CaCO3And Sb2O5Powder stoichiometrically formula NaAl3Ca2Sb2O12Weigh dispensing；
(2) being mixed 12 hours by step (1) raw material wet ball-milling, ball-milling medium is distilled water, at 1100 DEG C of air gas after drying Pre-burning 6 hours in atmosphere；
(3), after adding binding agent pelletize in the powder that step (2) prepares, re-compacted molding, finally at 1150～1200 DEG C Air atmosphere sinters 4 hours；Described binding agent uses mass concentration to be the poly-vinyl alcohol solution of 5%, and polyvinyl alcohol adds Amount accounts for the 3% of powder gross mass.
CN201610624985.4A 2016-07-30 2016-07-30 A kind of composite oxides NaAl3ca2sb2o12application as temperature-stable microwave dielectric ceramic Pending CN106220147A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114213125A (en) * 2021-12-30 2022-03-22 杭州电子科技大学 Microwave dielectric ceramic and preparation method thereof
CN114479855A (en) * 2022-02-28 2022-05-13 大连民族大学 Ultraviolet and blue light dual-excitation near-infrared fluorescent powder, preparation method and application

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105272202A (en) * 2015-10-09 2016-01-27 桂林理工大学 Temperature-stable low-dielectric-constant microwave dielectric ceramic Li4Mg4CuSb2O12 and preparation method thereof

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105272202A (en) * 2015-10-09 2016-01-27 桂林理工大学 Temperature-stable low-dielectric-constant microwave dielectric ceramic Li4Mg4CuSb2O12 and preparation method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114213125A (en) * 2021-12-30 2022-03-22 杭州电子科技大学 Microwave dielectric ceramic and preparation method thereof
CN114479855A (en) * 2022-02-28 2022-05-13 大连民族大学 Ultraviolet and blue light dual-excitation near-infrared fluorescent powder, preparation method and application

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Application publication date: 20161214