US4987108A
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Dielectric paste
Assignee: Murata Manufacturing Co Ltd
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Filing: 1988-03-09
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Granted: 1991-01-22
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Expires: 2008-03-09
Abstract
Abstract A dielectric paste for fabrication of multilayer ceramic substrates containing capacitive circuits. The paste comprises a dielectric powder composed of a dielectric material and a vitreous binder suspended in an organic vehicle. The dielectric material consists essentially of a composition expressed by the general formula: {(Ba.sub.1-x-y-z Sr.sub.x Ca.sub.y Mg.sub.z)O}.sub.m ·(Ti.sub.1-u Zr u )O 2 wherein x, y, z, u and m take values within the following respective ranges: 0≦x<0.30, 0≦y<0.30, 0≦z<0.05, 0≦u<0.25, 1≦m<1.03, and the vitreous binder consists essentially of a composition expressed by the general formula: αLi.sub.2 O·βBaO·γB.sub.2 O.sub.3 ·(1-α-β-γ)SiO 2 wherein α, β and γ are molar ratios of the respective ingredients and take values within the following respective ranges: 0≦α<0.25, 0.1≦β<0.5, 0.1<γ<0.5, and 0.3 <α+β+γ<0.8. The content of the vitreous binder in the dielectric powder ranges from not less than 5 wt % to less than 40 wt %.
Inventors
- 👤 Hiroshi Takagi
- 👤 Yoshiaki Mori
- 👤 Hiroji Tani
- 👤 Yukio Sakabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:17
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C03; C03C; C03C14/00; C03C14/004; C04B35/00; C04B35/01; C04B35/48; C04B35/49; C04B35/622; C04B35/626; C04B35/63; C04B35/6303; C04B35/6316; C04B41/45; C04B41/50; C04B41/5025; C04B41/5041; H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1236; H01G4/1245; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; C03C2214/00; C03C2214/04; C04B2111/00; C04B2111/00474; C04B2111/00844
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
124 words
A dielectric paste comprising a dielectric powder composed of a dielectric material and a vitreous binder suspended in an organic vehicle, said dielectric material consisting essentially of a composition expressed by the general formula: {(Ba.sub.1-x-y-z Sr.sub.x Ca.sub.y Mg.sub.z)O}.sub.m ·(Ti.sub.1-u Zr.sub.u)O.sub.2 wherein x, y, z, u and m take values within the following respective ranges: 0≦x<0.30, 0≦y<0.30, 0≦z<0.05, 0≦u<0.25, 1≦m<1.03, said vitreous binder consisting essentially of a composition expressed by the general formula: αLi.sub.2 O·βBaO·γB.sub.2 O.sub.3 ·(1-α-β-γ)SiO.sub.2 wherein α, β and γ are molar ratios of the respective ingredients and take values within the following respective ranges: 0≦α<0.25, 0.1≦β<0.5, 0.1<γ<0.5, 0.3 <α+β+γ<0.8, the content of the vitreous binder in the dielectric powder being not less than 5 wt % to less than 40 wt %.
Claim 2
Dependent Claim
124 words
A dielectric paste comprising a dielectric powder composed of a dielectric material and a vitreous binder suspended in an organic vehicle, said dielectric material consisting essentially of a composition expressed by the general formula: {(Ba.sub.1-x-y-z Sr.sub.x Ca.sub.y Mg.sub.z)O}.sub.m ·(Ti.sub.1-u Zr.sub.u)O.sub.2 wherein x, y, z, u and m take values within the following respective ranges: 0≦x<0.30, 0≦y<0.30, 0≦z<0.05, 0≦u<0.25, 1≦m<1.03, said vitreous binder consisting essentially of a composition expressed by the general formula: αLi.sub.2 O·βBaO·γB.sub.2 O.sub.3 ·(1-α-β-γ)SiO.sub.2 wherein α, β and γ are molar ratios of the respective ingredients and take values within the following respective ranges: 0≦α<0.25, 0.1≦β<0.5, 0.1<γ<0.5, 0.3 <α+β+γ<0.8, the content of the vitreous binder in the dielectric powder being not less than 5 wt % to less than 40 wt %.
Claim 3
Dependent Claim
35 words
A dielectric paste according to claim 1 in which x is 0 to 0.15, y is 0 to 0.1, z is 0 to 0.01, u is 0 to 0.15 and m is 1 to 1.02.
Claim 4
Dependent Claim
25 words
A dielectric paste according to claim 2 in which α is 0 to 0.15, β is 0.3 to 0.45 and γ is 0.2 to 0.3.
Claim 5
Dependent Claim
25 words
A dielectric paste according to claim 3 in which the content of the vitreous binder in the dielectric powder is 5 to 20 wt %.
Claim 6
Dependent Claim
24 words
A dielectric paste according to claim 4 which has been fired in a non-oxidizing atmosphere at a temperature of not more than 1050° C.
Claim 7
Dependent Claim
16 words
A dielectric paste according to claim 5 in contact with a copper or copper alloy electrode.
Claim 8
Dependent Claim
24 words
A dielectric paste according to claim 1 which has been fired in a non-oxidizing atmosphere at a temperature of not more than 1050° C.
Claim 9
Dependent Claim
16 words
A dielectric paste according to claim 7 in contact with a copper or copper alloy electrode.
References Cited (Backward Citations)
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