CN106116550A - A kind of silicate Li2siO3application as temperature-stable high quality factor microwave dielectric ceramic - Google Patents
A kind of silicate Li2siO3application as temperature-stable high quality factor microwave dielectric ceramic Download PDFInfo
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- CN106116550A CN106116550A CN201610470211.0A CN201610470211A CN106116550A CN 106116550 A CN106116550 A CN 106116550A CN 201610470211 A CN201610470211 A CN 201610470211A CN 106116550 A CN106116550 A CN 106116550A
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
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- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
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Abstract
The invention discloses a kind of silicate Li2SiO3Application as temperature-stable high quality factor ultralow dielectric microwave dielectric ceramic and preparation method thereof.(1) be 99.9%(percentage by weight by purity) more than Li2CO3And SiO2Starting powder press Li2SiO3Composition weigh dispensing；(2) by step (1) raw material wet ball-milling mix 12 hours, ball-milling medium is distilled water, after drying in 1000 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 1050 ~ 1100 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 1100 DEG C, and dielectric constant reaches 8.8～9.4, and its quality factor q f value is up to 93000 136000GHz, and temperature coefficient of resonance frequency is little, industrially has great using value.
Description
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 >=3000 GHz;(3) the temperature coefficient τ of resonant frequencyƒThe least to ensure what device had had
Heat stability, general requirement-10 ppm/DEG C≤τƒ≤+10 ppm/℃.Just have tried to from late 1930s in the world
Dielectric substance is applied to microwave technology, and prepares TiO2Microwave dielectric filter, but its temperature coefficient of resonance frequency τƒ
Too greatly cannot be practical.Since the seventies in last century, the large-scale development to medium ceramic material, root are started
According to relative dielectric constant εrSize from use frequency range different, generally can will have been developed that and developing microwave-medium pottery
Porcelain is divided into 4 classes.
(1) ultralow dielectric microwave dielectric ceramic, main representative is Al2O3-TiO2、Y2BaCuO5、MgAl2O4With
Mg2SiO4Deng, its εr≤ 20, quality factor q × f >=50000GHz, τƒ≤10 ppm/°C.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 the GHz of f >=10), τƒ≈0.As medium in the microwave communication equipments such as the direct broadcasting satellite being mainly used in f >=8 GHz
Resonating 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), τƒ≤5 ppm/°C.It is mainly used in 4
～8 in microwave military radar in GHz frequency range and communication system as dielectric resonance device.
(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.
The sintering temperature of the above material system is generally greater than 1300 ° of C, it is impossible to directly golden with the low melting point such as Ag and Cu
Belong to burning altogether and form multilayer ceramic capacitor.In recent years, along with LTCC Technology (Low Temperature Co-fired
Ceramics, LTCC) development and microwave multilayer device development requirement, research worker both domestic and external is to some low grade fever's systems
Material has carried out exploring widely and studying, and mainly uses devitrified glass or glassceramic composites system, because of low melting point
Glass has of a relatively high dielectric loss mutually, and the existence of glass phase substantially increases the dielectric loss of material.Therefore nothing is developed
The low fired microwave dielectric ceramic material of glass phase is the emphasis of current research.
Explore novel with exploitation can be during low fired microwave dielectric ceramic materials, the Li base that intrinsic sintering temperature is low
The material systems such as compound, Bi based compound, tungstates architecture compound and tellurate architecture compound get the attention with
Research, but due to three performance indications (ε of microwave dielectric ceramicrWith Q f and τƒBetween) be mutually restriction relation (see
Document: the restricting relation between microwave dielectric ceramic materials dielectric properties, Zhu Jianhua, Liang Fei, Wang little Hong, Lv Wenzhong, electronics unit
Part and material, phase March the 3rd in 2005), satisfied three performance requirements and the single-phase microwave-medium ceramics of low temperature sintering are very
Few, mainly their temperature coefficient of resonance frequency is the most excessive or quality factor are on the low side and cannot application request.Mesh
The front research major part to microwave-medium ceramics is the summary of experience drawn by great many of experiments, does not but have complete theory
Illustrate the relation of microstructure and dielectric properties, therefore, the most also cannot predict it from the composition of compound with structure
The microwave dielectric property such as temperature coefficient of resonance frequency and quality factor, which greatly limits low temperature co-fired technology and micro-
The development of ripple multilayer device.Explore with exploitation can low-temperature sintering have simultaneously near-zero resonance frequency temperature coefficient (-10 ppm/
℃≤τƒ≤+10 ppm/ DEG C) with the microwave dielectric ceramic of higher figure of merit be those skilled in the art thirst for solving always but
All the time the difficult problem succeeded it is difficult to.We are to consisting of Li2SiO3、Li2TiO3、Li2ZrO3、Li2SnO3Compound carry out
Sintering and Study on microwave dielectric property, find that their sintering temperature is less than 1250 DEG C, but only Li2SiO3There is nearly zero resonance
Frequency-temperature coefficient and high quality factor, Li2TiO3、Li2ZrO3With Li2SnO3The temperature coefficient of resonance frequency τ of potteryƒBigger than normal
(respectively+38 ppm/ DEG C ,+39 ppm/ DEG C and+27 ppm/ DEG C) and cannot as can be practical microwave-medium ceramics.
Summary of the invention
It is an object of the invention to provide and a kind of there is good heat stability and low-loss ultralow dielectric microwave be situated between
Electroceramics material and preparation method thereof.
The chemical composition of the microwave dielectric ceramic material of the present invention is Li2SiO3。
The preparation method step of this microwave dielectric ceramic material is:
(1) be 99.9%(percentage by weight by purity) more than Li2CO3And SiO2Starting powder press Li2SiO3Composition claim
Amount dispensing.
(2) being mixed 12 hours by step (1) raw material wet ball-milling, ball-milling medium is distilled water, big at 1000 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 1050 ~ 1100
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.
Advantages of the present invention: Li2SiO3Ceramic sintering temperature is relatively low, and cost of material is low；Its quality factor q f value is up to
93000-136000GHz, dielectric constant reaches 8.8～9.4, the temperature coefficient τ of its resonant frequencyƒLittle, temperature stability is good；
Can be widely used for the manufacture of the microwave devices such as various medium substrate, resonator and wave filter, low temperature co-fired technology and micro-can be met
The technology of ripple 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 preparation side
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. a silicate is as the application of temperature-stable high quality factor microwave dielectric ceramic, it is characterised in that described silicic acid
The chemical composition of salt is: Li2SiO3；
The preparation method of described silicate concretely comprises the following steps:
(1) be 99.9%(percentage by weight by purity) more than Li2CO3And SiO2Starting powder press Li2SiO3Composition weigh
Dispensing；
(2) being mixed 12 hours by step (1) raw material wet ball-milling, ball-milling medium is distilled water, at 1000 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 is finally big at 1050 ~ 1100 DEG C
Gas atmosphere sinters 4 hours；Described binding agent uses mass concentration to be the poly-vinyl alcohol solution of 5%, and polyvinyl alcohol addition accounts for
The 3% of powder gross mass.
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| CN201610470211.0A CN106116550A (en) | 2016-06-26 | 2016-06-26 | A kind of silicate Li2siO3application as temperature-stable high quality factor microwave dielectric ceramic |
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| CN201610470211.0A CN106116550A (en) | 2016-06-26 | 2016-06-26 | A kind of silicate Li2siO3application as temperature-stable high quality factor microwave dielectric ceramic |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106904960A (en) * | 2017-03-14 | 2017-06-30 | 电子科技大学 | A kind of Mg2SiO4‑Li2TiO3Compound system LTCC materials and preparation method thereof |
| CN110292906A (en) * | 2019-07-30 | 2019-10-01 | 华中科技大学 | Modified lithium metasilicate of wet grinding and preparation method thereof and the application as adsorbent |
| CN113413888A (en) * | 2021-05-31 | 2021-09-21 | 重庆第二师范学院 | Photocatalyst and preparation method and application thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103896573A (en) * | 2014-04-12 | 2014-07-02 | 桂林理工大学 | Temperature stabilization type microwave dielectric ceramic LiPO3 capable of being sintered at low temperature and preparation method of microwave dielectric ceramic LiPO3 |
| CN104591701A (en) * | 2014-12-28 | 2015-05-06 | 桂林理工大学 | Temperature-stabilized type ultralow-dielectric-constant microwave dielectric ceramic Li2Mg5O6 and preparation method thereof |
-
2016
- 2016-06-26 CN CN201610470211.0A patent/CN106116550A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103896573A (en) * | 2014-04-12 | 2014-07-02 | 桂林理工大学 | Temperature stabilization type microwave dielectric ceramic LiPO3 capable of being sintered at low temperature and preparation method of microwave dielectric ceramic LiPO3 |
| CN104591701A (en) * | 2014-12-28 | 2015-05-06 | 桂林理工大学 | Temperature-stabilized type ultralow-dielectric-constant microwave dielectric ceramic Li2Mg5O6 and preparation method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106904960A (en) * | 2017-03-14 | 2017-06-30 | 电子科技大学 | A kind of Mg2SiO4‑Li2TiO3Compound system LTCC materials and preparation method thereof |
| CN106904960B (en) * | 2017-03-14 | 2020-01-14 | 电子科技大学 | Mg2SiO4-Li2TiO3Composite system LTCC material and preparation method thereof |
| CN110292906A (en) * | 2019-07-30 | 2019-10-01 | 华中科技大学 | Modified lithium metasilicate of wet grinding and preparation method thereof and the application as adsorbent |
| CN113413888A (en) * | 2021-05-31 | 2021-09-21 | 重庆第二师范学院 | Photocatalyst and preparation method and application thereof |
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