CN106904950A - A kind of low sintering 95 alumina ceramic material - Google Patents
A kind of low sintering 95 alumina ceramic material Download PDFInfo
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Abstract
The invention discloses it is a kind of be characterised by low-temperature sintering, the ceramic material that alumina weight percentage is 95%（Referred to as 95 porcelain）And its manufacture method.It is characterized in adding 5.0% by appropriate MgO, SiO by major ingredient of 95.0% submicron order fine-grained alumina powder2, CaO, and B2O3、TiO2、Na213 kinds of sintering aids for mixing in O, dry-pressing formed prepared green compact after ball milling mixing, then sinter 24 hours, you can obtain 95 superior alumina ceramic materials of high-compactness, dielectric properties at a temperature of 1250 DEG C（Density：~3.8g·cm‑3, dielectric constant：9.75 9.85, Q ×fValue：28500‑33000GHz）.Method of the present invention by reducing the particle diameter and addition sintering aid of alumina powder, greatly reduces the sintering temperature of 95 porcelain, and energy consumption is small, cost-effective.
Description
Technical field
The present invention relates to low sintering 95 alumina ceramic material and its manufacture method and purposes, belong to a kind of microwave and be situated between
Material, can be used for the fields such as microwave communication.
Background technology
Alumina ceramic material is one kind with aluminum oxide（Al2O3）It is the ceramic material of main body.Alumina ceramic material is because of tool
There is high mechanical strength, hardness are big, high-temperature insulation resistance is high, high-frequency dielectric is lost small, chemical resistance and thermal conductivity is good etc.
A series of premium properties, have been widely used in the industry-by-industries such as machinery, oil, chemical industry, weaving, electronics and metallurgy.
Due to the fast development of radio communication, alumina ceramic material has been applied to substrate, resonance as microwave dielectric material recently
Critical component in device, filter and other microwave telecommunication systems, technically and commercially plays the role of important.According to
The number of alumina content in ceramic material, alumina ceramic material can be divided into 95 porcelain, 85 porcelain and 75 porcelain etc..With 85,75 porcelain phases
Than the alumina content of 95 porcelain is high, and dielectric properties are good（Particularly dielectric loss is low）, but 95 porcelain sintering temperatures are also far above simultaneously
85th, 75 porcelain, not only high cost, and be unfavorable for being burnt altogether with the base metal that some fusing points are relatively low.Therefore, low sintering 95 are developed
Porcelain is the target that home and abroad researcher pursues jointly.The method being usually taken has two, and one is good using sintering character
Superfine alumina powder, two is the appropriate low-temperature sintering auxiliary agent of selection.But up to the present, both approaches are combined application
Technology it is rarely found.
The content of the invention
It is an object of the invention to provide 95 excellent alumina ceramic materials of a kind of low-temperature sintering, dielectric properties and its manufacture
Method.
The basic characteristics of manufacture method of the present invention be the fine-grained alumina powder with submicron order as raw material, add by appropriate
MgO、SiO2, CaO, and B2O3、TiO2、Na2The sintering aid that 1-3 kinds in O are mixed jointly, be beneficial to low-temperature sintering and
Improve the dielectric properties of ceramic product.Ceramic green is obtained using dry pressuring forming process, ceramic green is placed in common electric furnace,
2-4 hours is incubated at a temperature of 1250 DEG C, heating rate is 2 DEG C/min.Can be prepared by high density, surface smooth, be situated between
95 aluminium oxide ceramics porcelain pieces of excellent electrical property.
It is first according to metering proportion and weighs raw material：95.0wt% aluminum oxide（Al2O3）, 5.0wt% sintering aids（By magnesia
（MgO）, silica（SiO2）, calcium oxide（CaO）, and boron oxide（B2O3）, titanium oxide（TiO2）, sodium oxide molybdena（NaO）1-3
Plant and mix jointly）, by recipe requirements, weigh raw material and be fitted into ball grinder, add deionized water to have with dry-pressing formed on a small quantity
Machine aided agent PVA, with zirconium oxide as Jie's ball milling is ground 24 hours, ball milling is dried 12-24 hours, after taking-up after terminating in 80 DEG C of baking ovens
40 mesh sieves are crossed, powder addition metal die is dry-pressing formed, and the ceramic green that will be suppressed is placed on 1250 DEG C in electric furnace of temperature
Lower sintering 2-4 hours, takes out after natural cooling, and high-compactness, 95 aluminium oxide ceramics parts of excellent performance are obtained.
Method of the present invention by being used in combination fine-grained alumina powder and addition sintering aid, greatly reduces 95 porcelain
Sintering temperature（1250℃）, energy consumption is small, cost-effective, while making low sintering 95 porcelain have excellent dielectric properties（Dielectric
Constant=9.75-9.85, Q ×fValue=28500-33000GHz）.Typically, with 95.0% fine grain Al2O3Powder+1.0%MgO+
1.0% SiO2 +1.0%CaO +1.0%TiO2+0.5%Na2O+0.5%B2O3It is raw material, can be sintered into a low temperature of 1250 DEG C
Porcelain, its bulk density is up to 3.83gcm-3, dielectric constant be 9.83, Q ×fValue can reach 33000GHz.
Specific embodiment
Embodiment one：With fine-grained alumina (Al2O3), commercial magnesia（MgO）, silica（SiO2）, calcium oxide
（CaO）And titanium oxide（TiO2）It is raw material, is weighed by following percentage by weight：Al2O3=95.0%, MgO=2.0%, SiO2 =
1.5%, CaO=1.0%, TiO2=0.5% weighs, and weighs good corresponding material and is fitted into ball milling in ball mill, and Ball-milling Time is 24h, ball
Grinding media is deionized water（Material：Water：Ball=1:2:3）.40 mesh sieves are crossed after drying and obtains mixed powder.By powder dry-pressing into cylinder
Shape sample, then sinters 2-4 hours at a temperature of less than 1250 DEG C, and programming rate is 2 DEG C/min.After natural cooling, you can
To high-compactness, smooth, excellent performance 95 porcelain alumina ceramic material.
Obtained 95 porcelain alumina ceramic material is tested, is as a result shown：This low sintering 95 porcelain ceramics material
Material bulk density is up to 3.78gcm-3, dielectric constant be 9.76, Q ×fValue can reach 28800GHz.
Embodiment two：With fine-grained alumina (Al2O3), commercial magnesia（MgO）, silica（SiO2）, calcium oxide
（CaO）And titanium oxide（TiO2）It is raw material, is weighed by following percentage by weight：Al2O3=95.0%, MgO=1.5%, SiO2 =
2.0%, CaO=1.0%, TiO2=0.5% weighs, and weighs good corresponding material and is fitted into ball milling in ball mill, and Ball-milling Time is 24h, ball
Grinding media is deionized water（Material：Water：Ball=1:2:3）.40 mesh sieves are crossed after drying and obtains mixed powder.By powder dry-pressing into cylinder
Shape sample, then sinters 2-4 hours at a temperature of less than 1250 DEG C, and programming rate is 2 DEG C/min.After natural cooling, you can
To high-compactness, smooth, excellent performance 95 porcelain alumina ceramic material.
Obtained 95 porcelain alumina ceramic material is tested, is as a result shown：This low sintering 95 porcelain ceramics material
Material bulk density is up to 3.79gcm-3, dielectric constant be 9.78, Q ×fValue can reach 29200GHz.
Embodiment three：With fine-grained alumina (Al2O3), commercial magnesia（MgO）, silica（SiO2）, calcium oxide
（CaO）And boron oxide（B2O3）It is raw material, is weighed by following percentage by weight：Al2O3=95.0%, MgO=1.5%, SiO2 =
2.0%, CaO=1.0%, B2O3=0.5% weighs, and weighs good corresponding material and is fitted into ball milling in ball mill, and Ball-milling Time is 24h, ball
Grinding media is deionized water（Material：Water：Ball=1:2:3）.40 mesh sieves are crossed after drying and obtains mixed powder.By powder dry-pressing into cylinder
Shape sample, then sinters 2-4 hours at a temperature of less than 1250 DEG C, and programming rate is 2 DEG C/min.After natural cooling, you can
To high-compactness, smooth, excellent performance 95 porcelain alumina ceramic material.
Obtained 95 porcelain alumina ceramic material is tested, is as a result shown：This low sintering 95 porcelain ceramic body
Product density is up to 3.80gcm-3, dielectric constant be 9.80, Q ×fValue can reach 30900GHz.
Embodiment four：With fine-grained alumina (Al2O3), commercial magnesia（MgO）, silica（SiO2）, calcium oxide
（CaO）And sodium oxide molybdena（Na2O）It is raw material, is weighed by following percentage by weight：Al2O3=95.0%, MgO=2.0%, SiO2 =
2.0%, CaO=0.5%, Na2O=0.5% is weighed, and is weighed good corresponding material and is fitted into ball milling in ball mill, and Ball-milling Time is 24h, ball
Grinding media is deionized water（Material：Water：Ball=1:2:3）.40 mesh sieves are crossed after drying and obtains mixed powder.By powder dry-pressing into cylinder
Shape sample, then sinters 2-4 hours at a temperature of less than 1250 DEG C, and programming rate is 2 DEG C/min.After natural cooling, you can
To high-compactness, smooth, excellent performance 95 porcelain alumina ceramic material.
Obtained 95 porcelain alumina ceramic material is tested, is as a result shown：This low sintering 95 porcelain ceramic body
Product density is up to 3.79gcm-3, dielectric constant be 9.79, Q ×fValue can reach 28600GHz.
Embodiment four：With fine-grained alumina (Al2O3), commercial magnesia（MgO）, silica（SiO2）, calcium oxide
（CaO）, titanium oxide（TiO2）, sodium oxide molybdena（Na2O）And boron oxide（B2O3）For raw material is raw material, claim by following percentage by weight
Amount：Al2O3=95.0%, MgO=1.0%, SiO2=1.5%, CaO=1.0%, TiO2=1.0%、B2O3=0.5% weighs, and has weighed phase
The material answered is fitted into ball milling in ball mill, and Ball-milling Time is 24h, and ball-milling medium is deionized water（Material：Water：Ball=1:2:3）.It is dry
40 mesh sieves are crossed after dry and obtains mixed powder.By powder dry-pressing into cylindric sample, then 2-4 is sintered at a temperature of less than 1250 DEG C
Hour, programming rate is 2 DEG C/min.After natural cooling, you can obtain high-compactness, smooth, excellent performance 95 porcelain oxygen
Change aluminium ceramic material.
Obtained 95 porcelain alumina ceramic material is tested, is as a result shown：This low sintering 95 porcelain ceramic body
Product density is up to 3.81gcm-3, dielectric constant be 9.81, Q ×fValue can reach 33500GHz.
Embodiment four：With fine-grained alumina (Al2O3), commercial magnesia（MgO）, silica（SiO2）, calcium oxide
（CaO）, titanium oxide（TiO2）, sodium oxide molybdena（Na2O）And boron oxide（B2O3）For raw material is raw material, claim by following percentage by weight
Amount：Al2O3=95.0%, MgO=1.0%, SiO2=1.0%, CaO=1.0%, TiO2=1.0%、Na2O=0.5%、B2O3=0.5% claims
Amount, weighs good corresponding material and is fitted into ball milling in ball mill, and Ball-milling Time is 24h, and ball-milling medium is deionized water（Material：Water：Ball
=1:2:3）.40 mesh sieves are crossed after drying and obtains mixed powder.By powder dry-pressing into cylindric sample, then less than 1250 DEG C of temperature
Degree lower sintering 2-4 hours, programming rate is 2 DEG C/min.After natural cooling, you can obtain high-compactness, smooth, performance excellent
95 different porcelain alumina ceramic materials.
By obtained 95 porcelain aluminium oxide ceramics, carry out test material result and show：This low sintering 95 porcelain ceramic body
Product density is up to 3.83gcm-3, dielectric constant be 9.83, Q ×fValue can reach 33000GHz.
Claims (5)
1. a kind of low sintering 95 alumina ceramic material, it is characterised in that：
Fine-grained alumina powder with submicron order is added by appropriate MgO, SiO as major ingredient2, CaO, and B2O3、TiO2、Na2O
In the sintering aid that mixes jointly of 1-3 kinds.
2. in step（1）In major ingredient and sintering aid added water in ball mill ball milling, sieving obtains mixed powder after drying；
By step（2）The mixed powder for obtaining is dry-pressing formed, fires, you can obtain required ceramics sample.
3. a kind of low sintering 95 alumina ceramic material according to claim 1, it is characterised in that：Step（2）In, it is main
Material is 95 with the proportioning of sintering aid：5（Percentage by weight）, the Ball-milling Time is 12 ~ 24h, and ball-milling medium grinds for zirconium oxide
Ball and deionized water, material：Water：Ball=1：2：3, drying temperature is 80oC。
4. a kind of low sintering 95 alumina ceramic material according to claim 1, it is characterised in that：Step（3）In, institute
The dry-pressing pressure stated is 50-200MPa, and sample sintering temperature is 1250oC, programming rate is 2 ~ 5 oC/ min, soaking time be 2 ~
5h；
5. a kind of low sintering 95 alumina ceramic material according to claim 1, it is characterised in that：The sample that will be baked
After product place some hours, performance test is carried out, as a result shown：This low sintering 95 alumina ceramic material consistency is high
（~3.8g·cm-3）, dielectric properties are good（Dielectric constant=9.75-9.85, Q ×fValue=28500-33000GHz）.Typically,
With 95% fine grain Al2O3The SiO of powder+1.0%MgO+1.0%2 +1.0%CaO +1.0%TiO2 +0.5%Na2O +0.5%B2O3It is original
Material, can obtain bulk density up to 3.83gcm in a low temperature of 1250 DEG C-3Sample, its dielectric constant be 9.83, Q ×f
Value can reach 33000GHz.
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