CN105819846A - Cordierite type microwave medium ceramic material and preparation method thereof - Google Patents

Cordierite type microwave medium ceramic material and preparation method thereof Download PDF

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CN105819846A
CN105819846A CN201610142779.XA CN201610142779A CN105819846A CN 105819846 A CN105819846 A CN 105819846A CN 201610142779 A CN201610142779 A CN 201610142779A CN 105819846 A CN105819846 A CN 105819846A
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ceramic material
ceramic
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purity
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黄骇
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ZHEJIANG ZAPON ELECTRONIC TECHNOLOGY CO LTD
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ZHEJIANG ZAPON ELECTRONIC TECHNOLOGY CO LTD
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • 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
    • C04B35/16—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 based on silicates other than clay
    • C04B35/18—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 based on silicates other than clay rich in aluminium oxide
    • C04B35/195—Alkaline earth aluminosilicates, e.g. cordierite or anorthite
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
    • C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
    • C04B2235/3232—Titanium oxides or titanates, e.g. rutile or anatase

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  • Organic Chemistry (AREA)
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Abstract

The invention relates to a cordierite type microwave medium ceramic material and a preparation method thereof. The chemical formula of the microwave ceramic is Mg<2>Al<4>(Si<5-x>Ti<x>)O<18>, 0.05=<x=<0.40. The preparation method comprises the following steps: precisely weighing powder of oxides of each element in the chemical formula according to the chemical formula, mixing, evenly grinding, pre-burning, granulating, pressing granules into sheets, moulding, sintering to prepare ceramic, mechanically processing the ceramic to prepare a dielectric resonator in the late period, and carrying out a microwave test on the dielectric resonator. The disclosed microwave ceramic has a low dielectric constant, a high quality factor, and a temperature coefficient of resonance frequency, which is close to zero, and thus is suitable for being used as a substrate material of a microwave circuit.

Description

A kind of cordierite type microwave dielectric ceramic materials and preparation method thereof
Technical field
The invention belongs to electronic information function ceramic material and device arts, be specifically related to Altofrequency, low-k, high quality factor, low resonant frequency temperature drift coefficient feature A kind of Mg2Al4(Si5-xTix)O18Microwave dielectric ceramic materials and preparation method thereof.
Background technology
Along with electronic technology is towards more miniaturization, integrated, the development in high frequency direction, letter Electronics under the drive of breath technology is unprecedentedly universal and fast development makes communication frequency band Contention the fiercest, all kinds of high-quality transmission of wireless signals make the components and parts must high frequency. The electronic component producing applicable high-frequency microwave application becomes inevitable.Owing to this kind of electronic component works Under microwave frequency band, thus the frequency response of microwave being had higher requirement, it is suitable to usually require that Dielectric constant ensure the Sizes of device, higher quality factor reduce device transmission signal During loss, low resonant frequency temperature drift coefficient guarantees that the working environment of device is by temperature The restriction of degree change.That has reported at present is good in operating ambient temperature lower frequency temperature stability, It is not a lot of that little and that dielectric constant less than 10 low dielectric microwave media ceramic kind is lost. The present invention provides a kind of dielectric constant at the dielectric constant microwave ceramic medium of 6～about 7, has Help supplement this series products, form system.
Summary of the invention
It is an object of the invention under prior art conditions, meet growing microwave and lead to The development of letter technology is to low dielectric, low-loss, low resonant frequency temperature drift coefficient microwave material Need, it is provided that a kind of silicates microwave dielectric ceramic materials, this ceramic dielectric constant 6～about 7, low-k, microwave property is excellent and near-zero frequency temperature coefficient.
The chemical formula of the cordierite type microwave dielectric material of the present invention is Mg2Al4(Si5-xTix)O18, 0.05≤x≤0.40；The DIELECTRIC CONSTANT ε of this microwave-medium ceramics systemrScope is 6.1～6.6, Quality factor q f scope is 42,000～75,300GHZ, temperature coefficient of resonance frequency τfScope For-24～+5ppm/ DEG C；
Make a general survey of this series compound, 0.05≤x≤0.40, this microwave dielectric ceramic materials thing phase Mainly include single Mg2Al4(Si5-xTix)O18Cordierite solid solution phase, there is no rutile-type TiO2Producing mutually, that nature exists in a large number is Mg2Al4Si5O18Cordierite type mineral, work as TiO2 With MgO, Al2O3And SiO2It is to have with cordierite according to generate after corresponding proportioning hybrid reaction The Mg of same crystal structure Cccm (66)2Al4(Si5-xTix)O18。
It is a further object to provide the preparation method of above-mentioned microwave dielectric ceramic materials, Specifically comprise the following steps that
(1). raw-material choose:
Purity (weight/mass percentage composition) is MgO, the purity (quality hundred of 99.70%～99.99% Point content) it is the Al of 99.70%～99.99%2O3, purity (weight/mass percentage composition) be The SiO of 99.70%～99.99%2It is 99.80%～99.99% with purity (weight/mass percentage composition) TiO2；
(2). dispensing and batch mixing:
By MgO, Al2O3、SiO2、TiO2According to chemical formula Mg2Al4(Si5-xTix)O18Weigh former Material, using dehydrated alcohol as abrasive media, is placed in grinding in ball grinder 18～24 hours, obtains Thick compound；Then this compound is placed in 70 DEG C～90 DEG C of baking ovens and is dried to constant weight, Obtain dry pack；
(3).Mg2Al4(Si5-xTix)O18Ceramic Material pre-burning:
Dry pack step (2) obtained first crosses 80 mesh standard sieves, after allowing granule be uniformly dispersed, It is placed in box Muffle furnace 1250～1350 DEG C of pre-burnings 4 hours, makes mixed powder initial reaction Generate Mg2Al4(Si5-xTix)O18Ceramic material, adds in the ceramic material that initial reaction generates again Enter dehydrated alcohol, be placed in ball milling 18～taking-up after 24 hours in ball mill, be placed in 60～110 DEG C Baking oven is dried to constant weight, obtain the Mg of particle diameter refinement2Al4(Si5-xTix)O18Ceramic material；
(4).Mg2Al4(Si5-xTix)O18The pelletize of ceramic material:
Mg after the particle diameter refinement that step 3 is obtained2Al4(Si5-xTix)O1880 mesh first crossed by ceramic material Standard screen, after making granule be uniformly dispersed, adds binding agent mixing, after the refinement of every 40g particle diameter Mg2Al4(Si5-xTix)O18Ceramic material adds 1.5ml～3ml binding agent, by the material after mixing Insert in pressed powder forming machine, be pressed under 100～200Mpa pressure a diameter of 30～ 40mm, thickness are the cylinder of 9～15mm；Crush after displaying 30 minutes, after crushing Mg2Al4(Si5-xTix)O18Material granule crosses lamination standard screen successively, and this standard screen upper strata is 60 Mesh, lower floor is 120 mesh.Will be by 120 mesh standard sieves, the meticulous granule of particle diameter is as step (6) bedding and padding, choose by 60 mesh sieves, but not by the granule of 120 mesh sieves as finally Compressing material；
Described binding agent be mass concentration be the poly-vinyl alcohol solution of 5wt%～10wt% (PVA)；
(5).Mg2Al4(Si5-xTix)O18The compression molding of ceramic material:
The compressing material chosen in step (4) is inserted in pressed powder forming machine, 90～ Be pressed into a diameter of 15mm under 100Mpa pressure, thickness be 6～7mm cylinder；
(6).Mg2Al4(Si5-xTix)O18Ceramic material sinter porcelain into:
Cylinder step (5) being pressed into sinters 4 hours at a temperature of 1350～1450 DEG C, sintering Time sample be placed on the aluminium oxide flat board being covered with bedding and padding, control less than 1000 DEG C programming rates Being 4 DEG C/min, 1000 DEG C to sintering temperature programming rate is 2 DEG C/min, and sintering temperature arrives The cooling rate of 1000 DEG C is 2 DEG C/min, closes temperature control system for less than 1000 DEG C and is naturally cooling to Room temperature, finally obtains the Mg of given shape2Al4(Si5-xTix)O18Pottery；
(7). later stage machining:
The Mg that will sinter2Al4(Si5-xTix)O18Finished product is made in ceramic grinding polishing.
The present invention uses the dielectric resonance post method test cylinder that Hakki and Coleman proposes Under resonant frequency, microwave dielectric property [is referred to document: B.W.Hakki, and P.D. Coleman, " Dielectric Resonator Method of Measuring Inductive Capacities in the Millimeter Range, " IEEE Trans.Microw.Theory Technol .Mtt-8,402 (1970)].
This microwave ceramics has low-k (6.1～6.6), belongs to low dielectric constant ceramic system. This pottery is possible not only to obtain higher quality factor (Qf) 75,300GHz, minimum 49,000 GHZ.Temperature coefficient of resonance frequency nearly zero 0.2ppm/ DEG C, compare Mg2Al4Si5O18's Qf (39,000GHz), temperature coefficient of resonance frequency (-32.1ppm/ DEG C) all has bigger performance to carry Rise.This pottery is suitable as microwave circuit baseplate material.
Accompanying drawing explanation
Fig. 1 is the ceramic material XRD accompanying drawing spectrum that the embodiment of the present invention 1～8 prepares；
Fig. 2 is the ceramic dielectric constant accompanying drawing that the embodiment of the present invention 1～8 prepares；
Fig. 3 is the ceramic material quality factor accompanying drawing that the embodiment of the present invention 1～8 prepares；
Fig. 4 is the ceramic material resonant frequency temperature system that the embodiment of the present invention 1～8 prepares Number accompanying drawing.
Detailed description of the invention
Example 1: preparation Mg2Al4(Si5-0.05Ti0.05)O18
Step (1). raw-material choose:
Purity (weight/mass percentage composition) is MgO, the purity (weight/mass percentage composition) of 99.99% It is the Al of 99.99%2O3, purity (weight/mass percentage composition) be the SiO of 99.99%2And purity (weight/mass percentage composition) is the TiO of 99.8%2；
Step (2). dispensing and batch mixing:
By MgO, Al2O3、SiO2、TiO2According to chemical formula Mg2Al4(Si5-xTix)O18For measuring, Weigh 6.8854g MgO, 17.4012g Al successively2O3、25.3794g SiO2、0.3414g TiO2 Raw material, using dehydrated alcohol as abrasive media, is placed in grinding in ball grinder 24 hours, obtains Aqueous compound；Then aqueous compound is placed in 90 DEG C of baking ovens and is dried to constant weight, obtain The compound being dried；
Step (3) .Mg2Al4(Si5-0.05Ti0.05)O18Ceramic Material pre-burning:
Dry pack step (2) obtained first crosses 80 mesh standard sieves, after allowing granule be uniformly dispersed, It is placed in box Muffle furnace 1250 DEG C of pre-burnings 4 hours, makes mixed powder initial reaction generate Mg2Al4(Si5-0.05Ti0.05)O18Ceramic material；The ceramic material that initial reaction generates adds Dehydrated alcohol, is placed in ball milling in ball mill and takes out after 24 hours, is placed in 90 DEG C of baking ovens drying Do to constant weight, obtain the Mg of particle diameter refinement2Al4(Si5-0.05Ti0.05)O18Ceramic material；
Step (4) .Mg2Al4(Si5-0.05Ti0.05)O18The pelletize of ceramic material:
Mg after the particle diameter refinement that step (3) is obtained2Al4(Si5-0.05Ti0.05)O18Ceramic material first mistake 80 mesh standard sieves, after making granule be uniformly dispersed, are subsequently adding binding agent mixing, after mixing Material insert in pressed powder forming machine, be pressed into a diameter of under 100～200Mpa pressure 30mm, thickness are the cylinder of 9mm；Crush after displaying 30 minutes, pelletize, will crushing After Mg2Al4(Si5-0.05Ti0.05)O18Material granule crosses lamination standard screen successively, on this standard screen Layer is 60 mesh, and lower floor is 120 mesh.The granule meticulous by 120 mesh standard sieve particle diameters is made For the bedding and padding of step (6), choose by 60 mesh sieves, but do not made by the granule of 120 mesh sieves For last compressing material；Obtain last compressing material；After every 40g particle diameter refinement Mg2Al4(Si5-0.05Ti0.05)O18Ceramic material adds 3ml binding agent；
Described binding agent be mass concentration be the poly-vinyl alcohol solution (PVA) of 5wt%；
Step (5) .Mg2Al4(Si5-0.05Ti0.05)O18The compression molding of ceramic material:
The compressing material chosen in step (4) is inserted in pressed powder forming machine, 90～ Be pressed into a diameter of 15mm under 100Mpa pressure, thickness be 6～7mm cylinder；
Step (6) .Mg2Al4(Si5-0.05Ti0.05)O18Ceramic material sinter porcelain into:
Cylinder step (5) being pressed into sinters 4 hours at a temperature of 1450 DEG C, controls 1000 DEG C Following programming rate is 4 DEG C/min, and 1000 DEG C to sintering temperature programming rate is 2 DEG C/min, The cooling rate of sintering temperature to 1000 DEG C is 2 DEG C/min, closes temperature control system for less than 1000 DEG C It is naturally cooling to room temperature, finally obtains the Mg of given shape2Al4(Si5-0.05Ti0.05)O18Pottery；
Step (7). later stage machining:
The Mg that will sinter2Al4(Si5-0.05Ti0.05)O18Finished product is made in ceramic grinding polishing.
The present invention uses the dielectric resonance cell method test cylinder that Hakki and Coleman proposes Microwave dielectric property under resonant frequency.As initial group of the present invention, the microwave of this pottery is situated between Electrical property is tested under 13.8GHZ resonant frequency: dielectric constant is 6.1, quality factor Qf is 42,500GHZ, and temperature coefficient of resonance frequency is-24ppm/ DEG C, result see accompanying drawing 1～ 4。
Example 2: preparation Mg2Al4(Si5-0.10Ti0.10)O18,
Step (1). raw-material choose:
Purity (weight/mass percentage composition) is MgO, the purity (weight/mass percentage composition) of 99.99% It is the Al of 99.99%2O3, purity (weight/mass percentage composition) be the SiO of 99.99%2And purity (weight/mass percentage composition) is the TiO of 99.8%2；
Step (2). dispensing and batch mixing:
By MgO, Al2O3、SiO2、TiO2According to chemical formula Mg2Al4(Si5-0.10Ti0.10)O18For Metering, weighs 6.8738g MgO, 17.3719g Al successively2O3、25.0807g SiO2、0.6817g TiO2Raw material, using dehydrated alcohol as abrasive media, is placed in grinding in ball grinder 24 hours, Obtain aqueous compound；Then aqueous compound is placed in 90 DEG C of baking ovens and is dried to constant weight, Obtain the compound being dried；
Step (3) .Mg2Al4(Si5-0.10Ti0.10)O18Ceramic Material pre-burning:
Dry pack step (2) obtained first crosses 80 mesh standard sieves, after allowing granule be uniformly dispersed, It is placed in box Muffle furnace 1250 DEG C of pre-burnings 4 hours, makes mixed powder initial reaction generate Mg2Al4(Si5-0.10Ti0.10)O18Ceramic material；The ceramic material that initial reaction generates adds Dehydrated alcohol, is placed in ball milling in ball mill and takes out after 24 hours, is placed in 90 DEG C of baking ovens drying Do to constant weight, obtain the Mg of particle diameter refinement2Al4(Si5-0.10Ti0.10)O18Ceramic material；
Step (4) .Mg2Al4(Si5-0.10Ti0.10)O18The pelletize of ceramic material:
Mg after the particle diameter refinement that step (3) is obtained2Al4(Si5-0.10Ti0.10)O18Ceramic material first mistake 80 mesh standard sieves, after making granule be uniformly dispersed, are subsequently adding binding agent mixing, after mixing Material insert in pressed powder forming machine, be pressed into a diameter of under 100～200Mpa pressure 30mm, thickness are the cylinder of 9mm；Crush after displaying 30 minutes, pelletize, will crushing After Mg2Al4(Si5-0.10Ti0.10)O18Material granule crosses lamination standard screen successively, on this standard screen Layer is 60 mesh, and lower floor is 120 mesh.The granule meticulous by 120 mesh standard sieve particle diameters is made For the bedding and padding of step (6), choose by 60 mesh sieves, but do not made by the granule of 120 mesh sieves For last compressing material；Obtain last compressing material；After every 40g particle diameter refinement Mg2Al4(Si5-0.10Ti0.10)O18Ceramic material adds 3ml binding agent；
Described binding agent be mass concentration be the poly-vinyl alcohol solution (PVA) of 5wt%；
Step (5) .Mg2Al4(Si5-0.10Ti0.10)O18The compression molding of ceramic material:
The compressing material chosen in step (4) is inserted in pressed powder forming machine, 90～ Be pressed into a diameter of 15mm under 100Mpa pressure, thickness be 6～7mm cylinder；
Step (6) .Mg2Al4(Si5-0.10Ti0.10)O18Ceramic material sinter porcelain into:
Cylinder step (5) being pressed into sinters 4 hours at a temperature of 1450 DEG C, controls 1000 DEG C Following programming rate is 4 DEG C/min, and 1000 DEG C to sintering temperature programming rate is 2 DEG C/min, The cooling rate of sintering temperature to 1000 DEG C is 2 DEG C/min, closes temperature control system for less than 1000 DEG C It is naturally cooling to room temperature, finally obtains the Mg of given shape2Al4(Si5-0.10Ti0.10)O18Pottery；
Step (7). later stage machining:
The Mg that will sinter2Al4(Si5-0.10Ti0.10)O18Finished product is made in ceramic grinding polishing.
The present invention uses the dielectric resonance cell method test cylinder that Hakki and Coleman proposes Microwave dielectric property under resonant frequency.Mg2Al4(Si5-0.10Ti0.10)O18The microwave dielectric property of pottery Can test under 13.8GHZ resonant frequency and be: dielectric constant is 6.2, and quality factor q f is 49,000GHZ, temperature coefficient of resonance frequency is-19ppm/ DEG C, and result is shown in accompanying drawing 1～4.
Example 3: preparation Mg2Al4(Si5-0.15Ti0.15)O18,
Step (1). raw-material choose:
Purity (weight/mass percentage composition) is MgO, the purity (weight/mass percentage composition) of 99.99% It is the Al of 99.99%2O3, purity (weight/mass percentage composition) be the SiO of 99.99%2And purity (weight/mass percentage composition) is the TiO of 99.8%2；
Step (2). dispensing and batch mixing:
By MgO, Al2O3、SiO2、TiO2According to chemical formula Mg2Al4(Si5-0.15Ti0.15)O18For Metering, weighs 6.8622g MgO, 17.3427g Al successively2O3、24.7830g SiO2、1.0208g TiO2Raw material, using dehydrated alcohol as abrasive media, is placed in grinding in ball grinder 24 hours, Obtain aqueous compound；Then aqueous compound is placed in 90 DEG C of baking ovens and is dried to constant weight, Obtain the compound being dried；
Step (3) .Mg2Al4(Si5-0.15Ti0.15)O18Ceramic Material pre-burning:
Dry pack step (2) obtained first crosses 80 mesh standard sieves, after allowing granule be uniformly dispersed, It is placed in box Muffle furnace 1250 DEG C of pre-burnings 4 hours, makes mixed powder initial reaction generate Mg2Al4(Si5-0.15Ti0.15)O18Ceramic material；The ceramic material that initial reaction generates adds Dehydrated alcohol, is placed in ball milling in ball mill and takes out after 24 hours, is placed in 90 DEG C of baking ovens drying Do to constant weight, obtain the Mg of particle diameter refinement2Al4(Si5-0.15Ti0.15)O18Ceramic material；
Step (4) .Mg2Al4(Si5-0.15Ti0.15)O18The pelletize of ceramic material:
Mg after the particle diameter refinement that step (3) is obtained2Al4(Si5-0.15Ti0.15)O18Ceramic material first mistake 80 mesh standard sieves, after making granule be uniformly dispersed, are subsequently adding binding agent mixing, after mixing Material insert in pressed powder forming machine, be pressed into a diameter of under 100～200Mpa pressure 30mm, thickness are the cylinder of 9mm；Crush after displaying 30 minutes, pelletize, will crushing After Mg2Al4(Si5-0.15Ti0.15)O18Material granule crosses lamination standard screen successively, on this standard screen Layer is 60 mesh, and lower floor is 120 mesh.The granule meticulous by 120 mesh standard sieve particle diameters is made For the bedding and padding of step (5), choose by 60 mesh sieves, but do not made by the granule of 120 mesh sieves For last compressing material；Obtain last compressing material；After every 40g particle diameter refinement Mg2Al4(Si5-0.15Ti0.15)O18Ceramic material adds 3ml binding agent；
Described binding agent be mass concentration be the poly-vinyl alcohol solution (PVA) of 5wt%；
Step (5) .Mg2Al4(Si5-0.15Ti0.15)O18The compression molding of ceramic material:
The compressing material chosen in step (4) is inserted in pressed powder forming machine, 90～ Be pressed into a diameter of 15mm under 100Mpa pressure, thickness be 6～7mm cylinder；
Step (6) .Mg2Al4(Si5-0.15Ti0.15)O18Ceramic material sinter porcelain into:
Cylinder step (5) being pressed into sinters 4 hours at a temperature of 1450 DEG C, controls 1000 DEG C Following programming rate is 4 DEG C/min, and 1000 DEG C to sintering temperature programming rate is 2 DEG C/min, The cooling rate of sintering temperature to 1000 DEG C is 2 DEG C/min, closes temperature control system for less than 1000 DEG C It is naturally cooling to room temperature, finally obtains the Mg of given shape2Al4(Si5-0.15Ti0.15)O18Pottery；
Step (7). later stage machining:
The Mg that will sinter2Al4(Si5-0.15Ti0.15)O18Finished product is made in ceramic grinding polishing.
The present invention uses the dielectric resonance cell method test cylinder that Hakki and Coleman proposes Microwave dielectric property under resonant frequency.As the matched group of the present invention, Mg2Al4(Si5-0.15Ti0.15)O18The microwave dielectric property of pottery is surveyed under 13.8GHZ resonant frequency Examination is: dielectric constant is 6.3, and quality factor q f is 59,000GHZ, resonant frequency temperature Coefficient is-17ppm/ DEG C, and result is shown in accompanying drawing 1～4.
Example 4: preparation Mg2Al4(Si5-0.20Ti0.20)O18,
Step (1). raw-material choose:
Purity (weight/mass percentage composition) is MgO, the purity (weight/mass percentage composition) of 99.99% It is the Al of 99.99%2O3, purity (weight/mass percentage composition) be the SiO of 99.99%2And purity (weight/mass percentage composition) is the TiO of 99.8%2；
Step (2). dispensing and batch mixing:
By MgO, Al2O3、SiO2、TiO2According to chemical formula Mg2Al4(Si5-0.20Ti0.20)O18For Metering, weighs 6.8507g MgO, 17.3135g Al successively2O3、24.4863g SiO2、1.3588g TiO2Raw material, using dehydrated alcohol as abrasive media, is placed in grinding in ball grinder 24 hours, Obtain aqueous compound；Then aqueous compound is placed in 90 DEG C of baking ovens and is dried to constant weight, Obtain the compound being dried；
Step (3) .Mg2Al4(Si5-0.20Ti0.20)O18Ceramic Material pre-burning:
Dry pack step (2) obtained first crosses 80 mesh standard sieves, after allowing granule be uniformly dispersed, It is placed in box Muffle furnace 1250 DEG C of pre-burnings 4 hours, makes mixed powder initial reaction generate Mg2Al4(Si5-0.20Ti0.20)O18Ceramic material；The ceramic material that initial reaction generates adds Dehydrated alcohol, is placed in ball milling in ball mill and takes out after 24 hours, is placed in 90 DEG C of baking ovens drying Do to constant weight, obtain the Mg of particle diameter refinement2Al4(Si5-0.20Ti0.20)O18Ceramic material；
Step (4) .Mg2Al4(Si5-0.20Ti0.20)O18The pelletize of ceramic material:
Mg after the particle diameter refinement that step (3) is obtained2Al4(Si5-0.20Ti0.20)O18Ceramic material first mistake 80 mesh standard sieves, after making granule be uniformly dispersed, are subsequently adding binding agent mixing, after mixing Material insert in pressed powder forming machine, be pressed into a diameter of under 100～200Mpa pressure 30mm, thickness are the cylinder of 9mm；Crush after displaying 30 minutes, pelletize, will crushing After Mg2Al4(Si5-0.20Ti0.20)O18Material granule crosses lamination standard screen successively, on this standard screen Layer is 60 mesh, and lower floor is 120 mesh.The granule meticulous by 120 mesh standard sieve particle diameters is made For the bedding and padding of step (5), choose by 60 mesh sieves, but do not made by the granule of 120 mesh sieves For last compressing material；Obtain last compressing material；After every 40g particle diameter refinement Mg2Al4(Si5-0.20Ti0.20)O18Ceramic material adds 3ml binding agent；
Described binding agent be mass concentration be the poly-vinyl alcohol solution (PVA) of 5wt%；
Step (5) .Mg2Al4(Si5-0.20Ti0.20)O18The compression molding of ceramic material:
The compressing material chosen in step (4) is inserted in pressed powder forming machine, 90～ Be pressed into a diameter of 15mm under 100Mpa pressure, thickness be 6～7mm cylinder；
Step (6) .Mg2Al4(Si5-0.20Ti0.20)O18Ceramic material sinter porcelain into:
Cylinder step (5) being pressed into sinters 4 hours at a temperature of 1450 DEG C, controls 1000 DEG C Following programming rate is 4 DEG C/min, and 1000 DEG C to sintering temperature programming rate is 2 DEG C/min, The cooling rate of sintering temperature to 1000 DEG C is 2 DEG C/min, closes temperature control system for less than 1000 DEG C It is naturally cooling to room temperature, finally obtains the Mg of given shape2Al4(Si5-0.20Ti0.20)O18Pottery；
Step (7). later stage machining:
The Mg that will sinter2Al4(Si5-0.20Ti0.20)O18Finished product is made in ceramic grinding polishing.
The present invention uses the dielectric resonance cell method test cylinder that Hakki and Coleman proposes Microwave dielectric property under resonant frequency.As the matched group of the present invention, pure Mg2Al4(Si5-0.20Ti0.20)O18The microwave dielectric property of pottery is surveyed under 13.0GHZ resonant frequency Examination is: dielectric constant is 6.3, and quality factor q f is 74,000GHZ, resonant frequency temperature Coefficient is-13ppm/ DEG C, and result is shown in accompanying drawing 1～4.
Example 5: preparation Mg2Al4(Si5-0.25Ti0.25)O18,
Step (1). raw-material choose:
Purity (weight/mass percentage composition) is MgO, the purity (weight/mass percentage composition) of 99.99% It is the Al of 99.99%2O3, purity (weight/mass percentage composition) be the SiO of 99.99%2And purity (weight/mass percentage composition) is the TiO of 99.8%2；
Step (2). dispensing and batch mixing:
By MgO, Al2O3、SiO2、TiO2According to chemical formula Mg2Al4(Si5-0.25Ti0.25)O18For Metering, weighs 6.8392g MgO, 17.2845g Al successively2O3、24.1906g SiO2、1.6957g TiO2Raw material, using dehydrated alcohol as abrasive media, is placed in grinding in ball grinder 24 hours, Obtain aqueous compound；Then aqueous compound is placed in 90 DEG C of baking ovens and is dried to constant weight, Obtain the compound being dried；
Step (3) .Mg2Al4(Si5-0.25Ti0.25)O188Ceramic Material pre-burning:
Dry pack step (2) obtained first crosses 80 mesh standard sieves, after allowing granule be uniformly dispersed, It is placed in box Muffle furnace 1250 DEG C of pre-burnings 4 hours, makes mixed powder initial reaction generate Mg2Al4(Si5-0.25Ti0.25)O18Ceramic material；The ceramic material that initial reaction generates adds Dehydrated alcohol, is placed in ball milling in ball mill and takes out after 24 hours, is placed in 90 DEG C of baking ovens drying Do to constant weight, obtain the Mg of particle diameter refinement2Al4(Si5-0.25Ti0.25)O18Ceramic material；
Step (4) .Mg2Al4(Si5-0.25Ti0.25)O18The pelletize of ceramic material:
Mg after the particle diameter refinement that step (3) is obtained2Al4(Si5-0.25Ti0.25)O18Ceramic material first mistake 80 mesh standard sieves, after making granule be uniformly dispersed, are subsequently adding binding agent mixing, after mixing Material insert in pressed powder forming machine, be pressed into a diameter of under 100～200Mpa pressure 30mm, thickness are the cylinder of 9mm；Crush after displaying 30 minutes, pelletize, will crushing After Mg2Al4(Si5-0.05Ti0.05)O18Material granule crosses lamination standard screen successively, on this standard screen Layer is 60 mesh, and lower floor is 120 mesh.The granule meticulous by 120 mesh standard sieve particle diameters is made For the bedding and padding of step (5), choose by 60 mesh sieves, but do not made by the granule of 120 mesh sieves For last compressing material；Obtain last compressing material；After every 40g particle diameter refinement Mg2Al4(Si5-0.05Ti0.05)O18Ceramic material adds 3ml binding agent；
Described binding agent be mass concentration be the poly-vinyl alcohol solution (PVA) of 5wt%；
Step (5) .Mg2Al4(Si5-0.25Ti0.25)O18The compression molding of ceramic material:
The compressing material chosen in step (4) is inserted in pressed powder forming machine, 90～ Be pressed into a diameter of 15mm under 100Mpa pressure, thickness be 6～7mm cylinder；
Step (6) .Mg2Al4(Si5-0.25Ti0.25)O18Ceramic material sinter porcelain into:
Cylinder step (5) being pressed into sinters 4 hours at a temperature of 1450 DEG C, controls 1000 DEG C Following programming rate is 4 DEG C/min, and 1000 DEG C to sintering temperature programming rate is 2 DEG C/min, The cooling rate of sintering temperature to 1000 DEG C is 2 DEG C/min, closes temperature control system for less than 1000 DEG C It is naturally cooling to room temperature, finally obtains the Mg of given shape2Al4(Si5-0.25Ti0.25)O18Pottery；
Step (7). later stage machining:
The Mg that will sinter2Al4(Si5-0.25Ti0.25)O18Finished product is made in ceramic grinding polishing.
The present invention uses the dielectric resonance cell method test cylinder that Hakki and Coleman proposes Microwave dielectric property under resonant frequency.As the matched group of the present invention, Mg2Al4(Si5-0.25Ti0.25)O18The microwave dielectric property of pottery is surveyed under 15.0GHZ resonant frequency Examination is: dielectric constant is 6.4, and quality factor q f is 68,500GHZ, resonant frequency temperature Coefficient is-10ppm/ DEG C, and result is shown in accompanying drawing 1～4.
Example 6: preparation Mg2Al4(Si5-0.30Ti0.30)O18,
Step (1). raw-material choose:
Purity (weight/mass percentage composition) is MgO, the purity (weight/mass percentage composition) of 99.99% It is the Al of 99.99%2O3, purity (weight/mass percentage composition) be the SiO of 99.99%2And purity (weight/mass percentage composition) is the TiO of 99.8%2；
Step (2). dispensing and batch mixing:
By MgO, Al2O3、SiO2、TiO2According to chemical formula Mg2Al4(Si5-0.30Ti0.30)O18For Metering, weighs 6.8278g MgO, 17.2556g Al successively2O3、23.8959g SiO2、2.0315g TiO2Raw material, using dehydrated alcohol as abrasive media, is placed in grinding in ball grinder 24 hours, Obtain aqueous compound；Then aqueous compound is placed in 90 DEG C of baking ovens and is dried to constant weight, Obtain the compound being dried；
Step (3) .Mg2Al4(Si5-0.30Ti0.30)O18Ceramic Material pre-burning:
Dry pack step (2) obtained first crosses 80 mesh standard sieves, after allowing granule be uniformly dispersed, It is placed in box Muffle furnace 1250 DEG C of pre-burnings 4 hours, makes mixed powder initial reaction generate Mg2Al4(Si5-0.30Ti0.30)O18Ceramic material；The ceramic material that initial reaction generates adds Dehydrated alcohol, is placed in ball milling in ball mill and takes out after 24 hours, is placed in 90 DEG C of baking ovens drying Do to constant weight, obtain the Mg of particle diameter refinement2Al4(Si5-0.30Ti0.30)O18Ceramic material；
Step (4) .Mg2Al4(Si5-0.30Ti0.30)O18The pelletize of ceramic material:
Mg after the particle diameter refinement that step (3) is obtained2Al4(Si5-0.30Ti0.30)O18Ceramic material first mistake 80 mesh standard sieves, after making granule be uniformly dispersed, are subsequently adding binding agent mixing, after mixing Material insert in pressed powder forming machine, be pressed into a diameter of under 100～200Mpa pressure 30mm, thickness are the cylinder of 9mm；Crush after displaying 30 minutes, pelletize, will crushing After Mg2Al4(Si5-0.30Ti0.30)O18Material granule crosses lamination standard screen successively, on this standard screen Layer is 60 mesh, and lower floor is 120 mesh.The granule meticulous by 120 mesh standard sieve particle diameters is made For the bedding and padding of step (5), choose by 60 mesh sieves, but do not made by the granule of 120 mesh sieves For last compressing material；Obtain last compressing material；After every 40g particle diameter refinement Mg2Al4(Si5-0.30Ti0.30)O18Ceramic material adds 3ml binding agent；
Described binding agent be mass concentration be the poly-vinyl alcohol solution (PVA) of 5wt%；
Step (5) .Mg2Al4(Si5-0.30Ti0.30)O18The compression molding of ceramic material:
The compressing material chosen in step (4) is inserted in pressed powder forming machine, 90～ Be pressed into a diameter of 15mm under 100Mpa pressure, thickness be 6～7mm cylinder；
Step (6) .Mg2Al4(Si5-0.30Ti0.30)O18Ceramic material sinter porcelain into:
Cylinder step (5) being pressed into sinters 4 hours at a temperature of 1450 DEG C, controls 1000 DEG C Following programming rate is 4 DEG C/min, and 1000 DEG C to sintering temperature programming rate is 2 DEG C/min, The cooling rate of sintering temperature to 1000 DEG C is 2 DEG C/min, closes temperature control system for less than 1000 DEG C It is naturally cooling to room temperature, finally obtains the Mg of given shape2Al4(Si5-0.30Ti0.30)O18Pottery；
Step (7). later stage machining:
The Mg that will sinter2Al4(Si5-0.30Ti0.30)O18Finished product is made in ceramic grinding polishing.
The present invention uses the dielectric resonance cell method test cylinder that Hakki and Coleman proposes Microwave dielectric property under resonant frequency.As the matched group of the present invention, pure Mg2Al4(Si5-0.30Ti0.30)O18The microwave dielectric property of pottery is surveyed under 17.2GHZ resonant frequency Examination is: dielectric constant is 6.4, and quality factor q f is 75,000GHZ, resonant frequency temperature Coefficient is-5ppm/ DEG C, and result is shown in accompanying drawing 1～4.
Example 7: preparation Mg2Al4(Si5-0.35Ti0.35)O18,
Step (1). raw-material choose:
Purity (weight/mass percentage composition) is MgO, the purity (weight/mass percentage composition) of 99.99% It is the Al of 99.99%2O3, purity (weight/mass percentage composition) be the SiO of 99.99%2And purity (weight/mass percentage composition) is the TiO of 99.8%2；
Step (2). dispensing and batch mixing:
By MgO, Al2O3、SiO2、TiO2According to chemical formula Mg2Al4(Si5-0.35Ti0.35)O18For Metering, weighs 6.8164g MgO, 17.2267g Al successively2O3、23.6022g SiO2、2.3661g TiO2Raw material, using dehydrated alcohol as abrasive media, is placed in grinding in ball grinder 24 hours, Obtain aqueous compound；Then aqueous compound is placed in 90 DEG C of baking ovens and is dried to constant weight, Obtain the compound being dried；
Step (3) .Mg2Al4(Si5-0.35Ti0.35)O18Ceramic Material pre-burning:
Dry pack step (2) obtained first crosses 80 mesh standard sieves, after allowing granule be uniformly dispersed, It is placed in box Muffle furnace 1250 DEG C of pre-burnings 4 hours, makes mixed powder initial reaction generate Mg2Al4(Si5-0.35Ti0.35)O18Ceramic material；The ceramic material that initial reaction generates adds Dehydrated alcohol, is placed in ball milling in ball mill and takes out after 24 hours, is placed in 90 DEG C of baking ovens drying Do to constant weight, obtain the Mg of particle diameter refinement2Al4(Si5-0.35Ti0.35)O18Ceramic material；
Step (4) .Mg2Al4(Si5-0.35Ti0.35)O18The pelletize of ceramic material:
Mg after the particle diameter refinement that step (3) is obtained2Al4(Si5-0.35Ti0.35)O18Ceramic material first mistake 80 mesh standard sieves, after making granule be uniformly dispersed, are subsequently adding binding agent mixing, after mixing Material insert in pressed powder forming machine, be pressed into a diameter of under 100～200Mpa pressure 30mm, thickness are the cylinder of 9mm；Crush after displaying 30 minutes, pelletize, will crushing After Mg2Al4(Si5-0.35Ti0.35)O18Material granule crosses lamination standard screen successively, on this standard screen Layer is 60 mesh, and lower floor is 120 mesh.The granule meticulous by 120 mesh standard sieve particle diameters is made For the bedding and padding of step (5), choose by 60 mesh sieves, but do not made by the granule of 120 mesh sieves For last compressing material；Obtain last compressing material；After every 40g particle diameter refinement Mg2Al4(Si5-0.35Ti0.35)O18Ceramic material adds 3ml binding agent；
Described binding agent be mass concentration be the poly-vinyl alcohol solution (PVA) of 5wt%；
Step (5) .Mg2Al4(Si5-0.35Ti0.35)O18The compression molding of ceramic material:
The compressing material chosen in step (4) is inserted in pressed powder forming machine, 90～ Be pressed into a diameter of 15mm under 100Mpa pressure, thickness be 6～7mm cylinder；
Step (6) .Mg2Al4(Si5-0.35Ti0.35)O18Ceramic material sinter porcelain into:
Cylinder step (5) being pressed into sinters 4 hours at a temperature of 1450 DEG C, controls 1000 DEG C Following programming rate is 4 DEG C/min, and 1000 DEG C to sintering temperature programming rate is 2 DEG C/min, The cooling rate of sintering temperature to 1000 DEG C is 2 DEG C/min, closes temperature control system for less than 1000 DEG C It is naturally cooling to room temperature, finally obtains the Mg of given shape2Al4(Si5-0.35Ti0.35)O18Pottery；
Step (7). later stage machining:
The Mg that will sinter2Al4(Si5-0.35Ti0.35)O18Finished product is made in ceramic grinding polishing.
The present invention uses the dielectric resonance cell method test cylinder that Hakki and Coleman proposes Microwave dielectric property under resonant frequency.As the matched group of the present invention, Mg2Al4(Si5-0.35Ti0.35)O18The microwave dielectric property of pottery is surveyed under 13.9GHZ resonant frequency Examination is: dielectric constant is 6.5, and quality factor q f is 71,000GHZ, resonant frequency temperature Coefficient is-0.3ppm/ DEG C, and result is shown in accompanying drawing 1～4.
Example 8: preparation Mg2Al4(Si5-0.40Ti0.40)O18,
Step (1). raw-material choose:
Purity (weight/mass percentage composition) is MgO, the purity (weight/mass percentage composition) of 99.99% It is the Al of 99.99%2O3, purity (weight/mass percentage composition) be the SiO of 99.99%2And purity (weight/mass percentage composition) is the TiO of 99.8%2；
Step (2). dispensing and batch mixing:
By MgO, Al2O3、SiO2、TiO2According to chemical formula Mg2Al4(Si5-0.40Ti0.40)O18For Metering, weighs 6.8050g MgO, 17.1980g Al successively2O3、23.3094g SiO2、2.6996g TiO2Raw material, using dehydrated alcohol as abrasive media, is placed in grinding in ball grinder 24 hours, Obtain aqueous compound；Then aqueous compound is placed in 90 DEG C of baking ovens and is dried to constant weight, Obtain the compound being dried；
Step (3) .Mg2Al4(Si5-0.40Ti0.40)O18Ceramic Material pre-burning:
Dry pack step (2) obtained first crosses 80 mesh standard sieves, after allowing granule be uniformly dispersed, It is placed in box Muffle furnace 1250 DEG C of pre-burnings 4 hours, makes mixed powder initial reaction generate Mg2Al4(Si5-0.40Ti0.40)O18Ceramic material；The ceramic material that initial reaction generates adds Dehydrated alcohol, is placed in ball milling in ball mill and takes out after 24 hours, is placed in 90 DEG C of baking ovens drying Do to constant weight, obtain the Mg of particle diameter refinement2Al4(Si5-0.40Ti0.40)O18Ceramic material；
Step (4) .Mg2Al4(Si5-0.40Ti0.40)O18The pelletize of ceramic material:
Mg after the particle diameter refinement that step (3) is obtained2Al4(Si5-0.40Ti0.40)O18Ceramic material first mistake 80 mesh standard sieves, after making granule be uniformly dispersed, are subsequently adding binding agent mixing, after mixing Material insert in pressed powder forming machine, be pressed into a diameter of under 100～200Mpa pressure 30mm, thickness are the cylinder of 9mm；Crush after displaying 30 minutes, pelletize, will crushing After Mg2Al4(Si5-0.40Ti0.40)O18Material granule crosses lamination standard screen successively, on this standard screen Layer is 60 mesh, and lower floor is 120 mesh.The granule meticulous by 120 mesh standard sieve particle diameters is made For the bedding and padding of step (5), choose by 60 mesh sieves, but do not made by the granule of 120 mesh sieves For last compressing material；Obtain last compressing material；After every 40g particle diameter refinement Mg2Al4(Si5-0.40Ti0.40)O18Ceramic material adds 3ml binding agent；
Described binding agent be mass concentration be the poly-vinyl alcohol solution (PVA) of 5wt%；
Step (5) .Mg2Al4(Si5-0.40Ti0.40)O18The compression molding of ceramic material:
The compressing material chosen in step (4) is inserted in pressed powder forming machine, 90～ Be pressed into a diameter of 15mm under 100Mpa pressure, thickness be 6～7mm cylinder；
Step (6) .Mg2Al4(Si5-0.40Ti0.40)O18Ceramic material sinter porcelain into:
Cylinder step (5) being pressed into sinters 4 hours at a temperature of 1450 DEG C, controls 1000 DEG C Following programming rate is 4 DEG C/min, and 1000 DEG C to sintering temperature programming rate is 2 DEG C/min, The cooling rate of sintering temperature to 1000 DEG C is 2 DEG C/min, closes temperature control system for less than 1000 DEG C It is naturally cooling to room temperature, finally obtains the Mg of given shape2Al4(Si5-0.40Ti0.40)O18Pottery；
Step (7). later stage machining:
The Mg that will sinter2Al4(Si5-0.40Ti0.40)O18Finished product is made in ceramic grinding polishing.
The present invention uses the dielectric resonance cell method test cylinder that Hakki and Coleman proposes Microwave dielectric property under resonant frequency.As the matched group of the present invention, Mg2Al4(Si5-0.40Ti0.40)O18The microwave dielectric property of pottery is surveyed under 13.6GHZ resonant frequency Examination is: dielectric constant is 6.6, and quality factor q f is 73,000GHZ, resonant frequency temperature Coefficient is 5ppm/ DEG C, and result is shown in accompanying drawing 1～4.
Above-mentioned detailed description of the invention is used for explaining the present invention rather than limiting the invention, In the protection domain of spirit and claims of the present invention, any amendment that the present invention is made And change, both fall within protection scope of the present invention.

Claims (2)

1. a cordierite type microwave dielectric ceramic materials, it is characterised in that its chemical composition is Mg2Al4(Si5‐xTix)O18, 0.05≤x≤0.40.
A kind of Mg the most according to claim 12Al4(Si5‐xTix)O18Microwave dielectric ceramic materials Preparation method, it is characterised in that comprise the following steps:
(1). raw-material choose:
Purity (weight/mass percentage composition) is MgO, the purity (quality hundred of 99.70%～99.99% Point content) it is the Al of 99.70%～99.99%2O3, purity (weight/mass percentage composition) be The SiO of 99.70%～99.99%2It is 99.80%～99.99% with purity (weight/mass percentage composition) TiO2；
(2). dispensing and batch mixing:
By MgO, Al2O3、SiO2、TiO2According to chemical formula Mg2Al4(Si5‐xTix)O18Weigh former Material, using dehydrated alcohol as abrasive media, is placed in grinding in ball grinder 18～24 hours, obtains Thick compound；Then this compound is placed in 70 DEG C～90 DEG C of baking ovens and is dried to constant weight, Obtain dry pack；
(3).Mg2Al4(Si5‐xTix)O18Ceramic Material pre-burning:
Dry pack step (2) obtained first crosses 80 mesh standard sieves, after allowing granule be uniformly dispersed, It is placed in box Muffle furnace 1250～1350 DEG C of pre-burnings 4 hours, makes mixed powder initial reaction Generate Mg2Al4(Si5‐xTix)O18Ceramic material, adds in the ceramic material that initial reaction generates again Enter dehydrated alcohol, be placed in ball milling 18～taking-up after 24 hours in ball mill, be placed in 60～110 DEG C Baking oven is dried to constant weight, obtain the Mg of particle diameter refinement2Al4(Si5‐xTix)O18Ceramic material；
(4).Mg2Al4(Si5‐xTix)O18The pelletize of ceramic material:
Mg after the particle diameter refinement that step 3 is obtained2Al4(Si5‐xTix)O1880 mesh first crossed by ceramic material Standard screen, after making granule be uniformly dispersed, adds binding agent mixing, after the refinement of every 40g particle diameter Mg2Al4(Si5‐xTix)O18Ceramic material adds 1.5ml～3ml binding agent, by the material after mixing Insert in pressed powder forming machine, be pressed under 100～200Mpa pressure a diameter of 30～ 40mm, thickness are the cylinder of 9～15mm；Crush after displaying 30 minutes, after crushing
Mg2Al4(Si5‐xTix)O18Material granule crosses lamination standard screen successively, and this standard screen upper strata is 60 mesh, lower floor is 120 mesh.Will be by 120 mesh standard sieves, the granule conduct that particle diameter is meticulous The bedding and padding of step (6), choose by 60 mesh sieves, but not by the granule conduct of 120 mesh sieves Last compressing material；
Described binding agent be mass concentration be the poly-vinyl alcohol solution of 5wt%～10wt% (PVA)；
(5).Mg2Al4(Si5‐xTix)O18The compression molding of ceramic material:
The compressing material chosen in step (4) is inserted in pressed powder forming machine, 90～ Be pressed into a diameter of 15mm under 100Mpa pressure, thickness be 6～7mm cylinder；
(6).Mg2Al4(Si5‐xTix)O18Ceramic material sinter porcelain into:
Cylinder step (5) being pressed into sinters 4 hours at a temperature of 1350～1450 DEG C, sintering Time sample be placed on the aluminium oxide flat board being covered with bedding and padding, control less than 1000 DEG C programming rates Being 4 DEG C/min, 1000 DEG C to sintering temperature programming rate is 2 DEG C/min, and sintering temperature arrives The cooling rate of 1000 DEG C is 2 DEG C/min, closes temperature control system for less than 1000 DEG C and is naturally cooling to Room temperature, finally obtains the Mg of given shape2Al4(Si5‐xTix)O18Pottery；
(7). later stage machining:
The Mg that will sinter2Al4(Si5‐xTix)O18Finished product is made in ceramic grinding polishing.
CN201610142779.XA 2016-03-13 2016-03-13 Cordierite type microwave medium ceramic material and preparation method thereof Pending CN105819846A (en)

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CN108249906A (en) * 2018-04-20 2018-07-06 电子科技大学 A kind of high-quality factor microwave medium ceramic material and preparation method
CN111517771A (en) * 2020-04-03 2020-08-11 电子科技大学 Microwave dielectric ceramic material and preparation method thereof
CN111423225A (en) * 2020-05-12 2020-07-17 电子科技大学 Cordierite microwave dielectric ceramic material and preparation method thereof
CN112174653A (en) * 2020-10-23 2021-01-05 厦门松元电子有限公司 Microwave dielectric ceramic material with high Qf and low dielectric constant and preparation method thereof
CN112250434A (en) * 2020-10-23 2021-01-22 厦门松元电子有限公司 ZMAT series microwave ceramic material and preparation method and application thereof
CN112778007A (en) * 2021-01-11 2021-05-11 苏州艾福电子通讯股份有限公司 Temperature-stable microwave dielectric ceramic and preparation method and application thereof
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CN114213115A (en) * 2022-01-04 2022-03-22 浙江嘉康电子股份有限公司 Microwave dielectric material and preparation method thereof
CN114213115B (en) * 2022-01-04 2023-04-11 浙江嘉康电子股份有限公司 Microwave dielectric material and preparation method thereof
CN115141006A (en) * 2022-07-04 2022-10-04 杭州电子科技大学 Microwave dielectric ceramic material, composite material, preparation method and application thereof
CN115141006B (en) * 2022-07-04 2023-02-28 杭州电子科技大学 Microwave dielectric ceramic material, composite material, preparation method and application thereof
CN115108823A (en) * 2022-07-19 2022-09-27 杭州电子科技大学 Magnesium aluminate spinel microwave dielectric ceramic material and preparation method thereof
CN115108823B (en) * 2022-07-19 2023-05-23 杭州电子科技大学 Magnesia-alumina spinel microwave dielectric ceramic material and preparation method thereof
CN115806430A (en) * 2022-12-29 2023-03-17 湖南省新化县建平精细陶瓷有限公司 Low-dielectric-constant microwave ceramic and preparation method thereof
CN115806430B (en) * 2022-12-29 2023-07-07 湖南省新化县建平精细陶瓷有限公司 Low-dielectric-constant microwave ceramic and preparation method thereof

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Application publication date: 20160803