CN103570336A - High-density LTCC (Low Temperature Co-Fired Ceramic) substrate applicable to ultrahigh frequency condition and preparation method thereof - Google Patents
High-density LTCC (Low Temperature Co-Fired Ceramic) substrate applicable to ultrahigh frequency condition and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a high-density LTCC (Low Temperature Co-Fired Ceramic) substrate which is applicable to an ultrahigh frequency condition, and a preparation method of the substrate. The LTCC substrate consists of a glass ceramic material and an organic curtain coating system, wherein the glass ceramic material consists of 45-48wt% of alpha-Al2O3, 50-53wt% of lanthanum-aluminum-borosilicate glass and 1-3wt% of ceramic pigment; the organic curtain coating system consists of 8-10wt% of a binding agent, 80-83wt% of a solvent, 3-4wt% of a dispersing agent, 5-6wt% of a plasticizer and 0-1wt% of rosin. The preparation method comprises the following steps: adding the organic curtain coating system into the glass ceramic material, preparing the materials into curtain coating slurry with solid content of 50-70wt%, performing ball milling so as to obtain an LTCC raw material tape, shearing, overlapping and hot-pressing the LTCC raw material tape, putting the LTCC raw material tape into a silicon carbide rod furnace, removing rubber and roasting so as to obtain the LTCC substrate with ultrahigh frequency low consumption and low dielectric constant. The blank in the technical field of ultrahigh frequency low-temperature cofired ceramic materials is made up.
Description
Technical field
The present invention relates to a kind of ultra-high frequency LTCC porcelain and raw material band preparation method, can be applicable to the technical fields such as wireless network, satellite transmission, CDMA, radar, Wireless USB transmission, microwave device.
Background technology
Along with the increase of backhaul HD video to video flowing demand in mobile phone and broadcast and closed-circuit television, people are very interested in the frequently available abundant bandwidth of millimeter wave.LTE service is in mobile network's deploy, and each base station needs the backhaul ability of 100Mbps, and at millimeter wave frequency band, total nearly 7GHz bandwidth can be for these application.Abundant bandwidth in these hyper bands also can be radar and imaging system provides more high resolving power.Moving launching system depends on the sweep method of similar radar conventionally, and the passive system only receiving requires near W frequency range about 100GHz, surpass in the bandwidth of 20GHz and all will have good sensitivity and high gain; In addition, the auxiliary accurate millimeter wave radar of applying that waits of adaptive cruise control and lane changing, frequency range is 77 and 79GHz frequency range.The deployment of millimeter-wave systems and the use of these frequency ranges, in the restriction to some extent of encapsulation and manufacture view.Problem is that module package designs and how to adjust assembly, how in suitable place, to add absorbing material so that module works and optimizes its aspect of performance, has run into numerous difficulties.By integrated various very high frequency(VHF) monolithic devices, successfully realize millimeter wave module and subsystem often needs the low-loss LTCC material of ultra-high frequency.
At present, the ultra-high frequency LTCC porcelain that domestic applicable microcircuit is used and meticulous technology of preparing thereof are still the first stage of research.Especially meeting frequency, be that the millimeter wave hyper band packaged material LTCC system of 10GHz and higher hundred G frequencies is very few.Because LTCC technology relates to materialogy and the large subject of microtronics two, material aspect also relates to porcelain, organic ink mates with three kinds of different kind of material of metal paste, porcelain relates to again technology controlling and process, and raw material band curtain coating, silk screen printing and the equipment such as low temperature co-fired.The restriction of above-mentioned all factors, makes LTCC material have a lot of problem in science that need research.The invention discloses a kind of ultra-high frequency microwave LTCC porcelain and substrate preparation method.
Summary of the invention
The object of the present invention is to provide a kind of high-density LTCC substrate being applicable under ultra-high frequency condition.
Another object of the present invention is to provide this to be applicable to the preparation method of the high-density LTCC substrate under ultra-high frequency condition.
A LTCC substrate for high density packing, is prepared into substrate by glass-ceramic material through the organic curtain coating system of different solid contents curtain coating;
Described beramic color be vanadium zirconium yellow, take flutter your Huang, cobalt ultramarine, cobalt blue, zinc titan yellow, peacock blue, cobalt powder is red, victoria green, chromium titanium tea or vanadium zirconium indigo plant;
Wherein glass-ceramic material is by the following component that accounts for overall weight percent: α-Al of 45~48wt%
2o
3, the lanthanum aluminium boron glass of 50~53wt% and the beramic color of 1~2wt% form;
Described lanthanum aluminium boron glass is by La
2o
329~32wt%; B
2o
327~29wt%; Al
2o
319~21wt%; CaO14~16wt%; BaO0~2wt%; P
2o
54~6wt%; MgO0.3~1wt%; R
2o (R=Li, Na or K) 0.5~1.6wt% forms;
Organic curtain coating system is comprised of following component: binding agent 8~10%; Solvent 80~83%; Dispersion agent 3~4wt%; Softening agent 5~6wt%; Rosin 0~1wt%.
Described solvent is the mixture of trichloroethane 60~65wt%, methylethylketone 25~28wt%, Virahol 12~15wt%; Described dispersion agent is menhaden fish oil; Described softening agent is butyl benzyl phthalate;
Described binding agent is to take the methacrylic acid of 0.5~0.6wt%, the methyl acrylate of the β-dimethyl-aminoethylmethacrylate of 64%~66wt%, 33%~35wt% is monomer, the Diisopropyl azodicarboxylate of 0.4%~0.6wt% is initiator, adopts solution polymerization process to make relative molecular weight (Mn) for the copolymer binder of 65000-75000.
A high-density LTCC substrate for ultra-high frequency condition, preparation process is as follows:
(1) preparation of binding agent:
Take methacrylic acid, β-dimethyl-aminoethylmethacrylate, methyl acrylate is monomer, and Diisopropyl azodicarboxylate is initiator, adopts solution polymerization process to make the multipolymer that relative molecular weight (Mn) is 65000~75000.
Concrete operations are: methacrylic acid (0.5~0.6wt%), β-dimethyl-aminoethylmethacrylate (64wt%~66wt%), methyl acrylate (33wt%~35wt%) are mixed and be placed in reactor; Diisopropyl azodicarboxylate (0.4wt%~0.5wt%) is dissolved in acetone solvent, slowly splashes in reactor; By repeatedly filling nitrogen-vacuumize the oxygen in the system of removing, and under nitrogen protection, at 70-80 ℃, adopt magnetic force or mechanical stirring to carry out copolyreaction; Reaction finishes rear underpressure distillation removes product, obtains copolymer binder.
(2) preparation of lanthanum aluminium boron glass:
Pressing lanthanum aluminium boron glass formula forms: La
2o
329~32wt%; B
2o
327~29wt%; Al
2o
319~21wt%; CaO14~16wt%; BaO0~2wt%; P
2o
54~6wt%; MgO 0.3~1wt%; R
2o0.5~2wt%R is Li, Na, K any two kinds, prepares its mixture blend 8~12h; Be placed in platinum crucible, at 1350~1500 ℃, be incubated 0.5~2h and make its complete melting and homogenizing, pour quenching in deionized water into and obtain transparent glass.Through roller mill coarse crushing, adopt after quick abrading-ball mill 0.5h~1h, to dry, it is 0.5~3 μ m powder that mistake 100 mesh sieves obtain median size.
(3) preparation of glass-ceramic material:
According to α-Al
2o
3account for 45~48wt% of glass-ceramic material gross weight, lanthanum aluminium boron glass accounts for 50~53wt% of glass-ceramic material gross weight, and beramic color accounts for 1~3wt% of glass-ceramic material gross weight, by α-Al
2o
3powder, lanthanum aluminium boron glass powder and beramic color, mix 7~8h and obtain green powder.
(4) preparation of LTCC raw material band:
In polytetrafluoroethyltank tank, take a certain amount of porcelain powder prepared by step (3), add organic curtain coating system, the casting slurry that preparation solid content is 50~70wt%; Use appropriate zirconia ball as grinding medium, with 150r/min ball milling 8h, through froth in vacuum, by controllable thickness casting machine flow casting molding, obtain LTCC raw material band; Made raw material band circuit substrate area>=100 * 100mm
2, individual layer standard thickness 0.100 ± 0.05mm and controlled, the substrate number of plies>=10 layer, angularity≤100 μ m/100mm;
(5) preparation of LTCC substrate:
By LTCC raw material band, carry out cutting, superimposed, hot pressing, be placed in silicon carbide rod furnace; Temperature rise rate with 1 ℃/min is warming up to 200 ℃, is incubated after 1~2h; With 1 ℃/min, be warming up to 400 ℃, be incubated 1~2h; With 1 ℃/min, be warming up to 500 ℃, be incubated 1~2h; With 2 ℃/min, be warming up to 850 ℃, insulation 15min; After furnace cooling, take out, obtain ultra-high frequency high density packing LTCC substrate.The sintering temperature of LTCC substrate is lower, at 850 ℃; Percent of firing shrinkage: X, Y-axis shrinking percentage 10~12%, Z axis shrinking percentage 8~10%; The dielectric properties of sintering porcelain body: at 10GGHz, specific inductivity low (7.0~8.0), dielectric loss <0.2%; Voltage breakdown >1000V/Mil, insulation resistivity 1 * 10
12Ω.
The material of ultra-high frequency low-loss low-k provided by the invention has been filled up the blank of China in ultra-high frequency low-temperature co-burning ceramic material technical field.
Accompanying drawing explanation
The DSC/TG curve of Fig. 1 embodiment of the present invention 1 gained lanthanum boron glass.As seen from the figure, at 760.7 ℃, having 1 sagging endotherm(ic)peak, is the glass transition temp (Tg point) of lanthanum aluminium boron glass.From 760.7 ℃ to 1000 ℃, occurring three exothermic peaks, is the crystallization peak of lanthanum aluminium boron glass glass.Warm area from glass transition to devitrification of glass is wider, and the time of glassy phase generation viscous flow is relatively long, contributes to the densified sintering product of glass ceramic material;
Fig. 2 is that 850 ℃ of glass-ceramic of the present invention (number 1 component) are burnt till rear section SEM figure.Can find out that the sample section after sintering is fine and close, pore-free or hole phenomenon.
Embodiment
The preparation of lanthanum aluminium boron glass:
Table 1 is each component concentration of lanthanum aluminium boron glass in the specific embodiment of the invention.By taking each component shown in table 1, after 8-12h mixes, in Platinum crucible, at 1350-1500 ℃, be incubated 0.5-5h and make its complete melting and homogenizing, pour into and in deionized water, obtain transparent lanthanum aluminium boron glass, after oven dry, through roller mill coarse crushing, arrive 0.3mm, press the pellet quality ratio of 1:4:1, adopt the quick mill that rotating speed is 500r/min, after ball milling 0.5h~1h, dry, it is 0.5~3 μ m lanthanum aluminium boron glass powder that mistake 100 mesh sieves obtain median size, to embodiment 1 lanthanum aluminium boron glass powder differential thermal analysis as shown in Figure 1.
Each component concentration of lanthanum aluminium boron glass (wt%) in table 1 specific embodiment of the invention
The preparation of binding agent:
Take methacrylic acid, β-dimethyl-aminoethylmethacrylate, methyl acrylate is monomer, and Diisopropyl azodicarboxylate is initiator, adopts solution polymerization process to make multipolymer that relative molecular weight (Mn) is 70000 as the binding agent of curtain coating system.
Concrete preparation method is: methacrylic acid, β-dimethyl-aminoethylmethacrylate (65wt%), methyl acrylate are mixed and be placed in reactor; Diisopropyl azodicarboxylate is dissolved in acetone solvent, and uses separating funnel slowly to splash in reactor; By repeatedly filling nitrogen-vacuumize the oxygen in the system of removing, and under nitrogen protection, at 75 ℃, adopt magnetic force or mechanical stirring to carry out copolyreaction; Reaction finishes rear underpressure distillation removes product, obtains copolymer binder.Component is in Table 2.
The content (wt%) of table 2 each component of binding agent of the present invention
The preparation of raw material band:
The slurry that is 55wt% by the formulated solid content of table 3, carry out flow casting molding dry after, obtain the raw material band that the present invention uses.
The content (wt%) of table 3 each component of raw material band of the present invention (in this table mark red inadequate 100%)
Indicate: solvent (trichloroethane 60wt%; Methylethylketone 26wt%; Virahol 14wt%)
The preparation of LTCC substrate:
To raw material band cut into slices, lamination, and waiting (100MPa) compression moulding under static pressure.Then from room temperature, with 1 ℃/min, be warming up to 200 ℃, be incubated after 1~2h; With 1 ℃/min, be warming up to 400 ℃, be incubated 1~2h; With 1 ℃/min, be warming up to 500 ℃, be incubated 1~2h; With 2 ℃/min, be warming up to 850 ℃, insulation 15min; After furnace cooling, taking-up obtains LTCC and burns till substrate.To the photo of substrate profile scanning Electronic Speculum as shown in Figure 3, can find out that the sample section after sintering is fine and close, without hole phenomenon.Performance test to substrate is as shown in table 4.The unit of each parameter is as follows: density: gcm
-3, shrinking percentage: %, dielectric properties: 10GHz.
Table 4LTCC substrate material sintering character
Claims (5)
1. be applicable to the high-density LTCC substrate under ultra-high frequency condition, by glass-ceramic material, through the organic curtain coating system of different solid contents curtain coating, formed;
Wherein glass-ceramic material is by the following component that accounts for overall weight percent: α-Al of 45~48wt%
2o
3, the lanthanum aluminium boron glass of 50~53wt% and the beramic color of 1~2wt% form;
Described lanthanum aluminium boron glass is by La
2o
329~32wt%; B
2o
327~29wt%; Al
2o
319~21wt%; CaO14~16wt%; BaO0~2wt%; P
2o
54~6wt%; MgO0.3~1wt%; R
2o0.5~1.6wt% forms, and wherein R is Li, Na, K any two kinds;
Organic curtain coating system is comprised of following component: binding agent 8~10%; Solvent 80~83%; Dispersion agent 3~4wt%; Softening agent 5~6wt%; Rosin 0~1wt%;
Described binding agent is to take the methacrylic acid of 0.5~0.6wt%, the methyl acrylate of the β-dimethyl-aminoethylmethacrylate of 64%~66wt%, 33%~35wt% is monomer, the Diisopropyl azodicarboxylate of 0.4%~0.5wt% is initiator, adopts solution polymerization process to make the copolymer binder that relative molecular weight is 65000-75000.
2. the high-density LTCC substrate being applicable under ultra-high frequency condition according to claim 1, it is characterized in that described beramic color be vanadium zirconium yellow, take flutter your Huang, cobalt ultramarine, cobalt blue, zinc titan yellow, peacock blue, cobalt powder is red, victoria green, chromium titanium tea or vanadium zirconium indigo plant.
3. the high-density LTCC substrate being applicable under ultra-high frequency condition according to claim 1, is characterized in that the solvent of described organic curtain coating system is the mixture of trichloroethane 60~65wt%, methylethylketone 25~28wt%, Virahol 12~15wt%; Described dispersion agent is menhaden fish oil; Described softening agent is butyl benzyl phthalate.
4. the preparation method who is applicable to the high-density LTCC substrate under ultra-high frequency condition claimed in claim 1, comprises the following steps:
(1) preparation of binding agent:
Methacrylic acid, β-dimethyl-aminoethylmethacrylate, methyl acrylate are mixed and be placed in reactor; Diisopropyl azodicarboxylate is dissolved in acetone solvent, slowly splashes in reactor; By repeatedly filling nitrogen-vacuumize the oxygen in the system of removing, and under nitrogen protection, under agitation condition, copolymerization at 70-80 ℃; Reaction finishes rear underpressure distillation takes out product, obtains copolymer binder;
(2) preparation of lanthanum aluminium boron glass:
Press the formula of lanthanum aluminium boron glass, by each component blend 8~12h; At 1350~1500 ℃, be incubated 0.5~2h and make its complete melting and homogenizing, pour quenching in deionized water into and obtain transparent glass; Through roller mill coarse crushing, adopt after quick abrading-ball mill 0.5h~1h, to dry, it is 0.5~3 μ m powder that mistake 100 mesh sieves obtain median size;
(3) preparation of glass-ceramic material:
By α-Al
2o
3powder, lanthanum aluminium boron glass powder and beramic color, mix the green powder that 7~8h obtains glass-ceramic material;
(4) preparation of LTCC raw material band:
In polytetrafluoroethyltank tank, take the green powder of glass-ceramic material prepared by step (3), add organic curtain coating system, the casting slurry that preparation solid content is 50~70wt%; Use zirconia ball as grinding medium, ball milling, froth in vacuum, through controllable thickness casting machine flow casting molding, obtains LTCC raw material band; Made raw material band circuit substrate area>=100 * 100mm
2, individual layer standard thickness 0.100 ± 0.05mm and controlled, the substrate number of plies>=10 layer, angularity≤100 μ m/100mm.
(5) preparation of ultra-high frequency LTCC substrate: get the LTCC raw material band that step (4) obtains, after cutting, superimposed, hot pressing, be placed in silicon carbide rod furnace, after binder removal, sintering, obtain ultra-high frequency LTCC substrate, X, Y-axis shrinking percentage 10~12%, Z axis shrinking percentage 8~10%; The dielectric properties of sintering porcelain body: at 10GHz, specific inductivity 7.0~8.0, dielectric loss <0.2%; Voltage breakdown >1000V/Mil, insulation resistivity 1 * 10
12Ω.
5. the preparation method who is applicable to the high-density LTCC substrate under ultra-high frequency condition according to claim 4, is characterized in that described sintering process is that temperature rise rate with 1 ℃/min is warming up to 200 ℃ from room temperature, is incubated after 1~2h; Temperature rise rate with 1 ℃/min is warming up to 400 ℃, is incubated 1~2h; Temperature rise rate with 1 ℃/min is warming up to 500 ℃, is incubated 1~2h; Temperature rise rate with 2 ℃/min is warming up to 850 ℃, insulation 15min; After furnace cooling, take out, obtain ultra-high frequency high density packing LTCC substrate.
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