Claims
- 1. A method of making a monolithic capacitor comprising a plurality of superimposed alternating layers of a dielectric composition and metal electrodes bonded together into a unitary body, the method comprising the steps of
- a. calcining in air, at a peak temperature in the range 750.degree.-900.degree. C., for at least 5 minutes, a mixture of oxides or precursors thereof in such relative proportions to produce a dielectric composition, having the formula
- (Sr.sub.x Pb.sub.1-x TiO.sub.3).sub.a (PbMg.sub.0.5 W.sub.0.5 O.sub.3).sub.b
- wherein
- x is 0-0.10,
- a is 0.35-0.5,
- b is 0.5-0.65, and
- a plus b equals 1,
- then comminuting the resultant calcined product until substantially all the particles are 20 microns or less in largest dimension,
- b. preparing an unsintered flexible ceramic dielectric tape of the calcined product of step (a) in an inert liquid vehicle therefor,
- c. electroding two or more such tapes in the desired pattern with a dispersion of metal powder in an inert vehicle therefor,
- d. laminating a multiple number of such tapes as desired, the top layer being an unelectroded tape, and
- e. sintering the resultant laminate in air for at least 0.25 hour at a temperature in the range 900.degree.-1050.degree. C. to form a unitary monolithic multilayer capacitor having a K of at least 1000 and a dissipation factor of no more than 5%.
- 2. A method according to claim 1 wherein the metal powder of step (c ) is silver powder and the sintering temperature of step (e) is in the range 900.degree.-950.degree. C.
- 3. A method according to claim 1 wherein the metal powder of step (c) is Pd/Ag and the sintering temperature of step (e) is in the range 900.degree.-1050.degree. C.
- 4. A method according to claim 1 wherein the calcining step (a) is conducted for 0.25-8 hours and the sintering of step (e) is conducted at 900.degree.-1050.degree. C. for 0.5-4 hours.
Parent Case Info
This is a division of application Ser. No. 594,281, filed July 9, 1975, now abandoned.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
RE26421 |
Rodriguez et al. |
Jul 1968 |
|
3472777 |
Brixner |
Oct 1969 |
|
3536625 |
Murakawa et al. |
Oct 1970 |
|
3604082 |
McBrayer et al. |
Sep 1971 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
2,449,698 |
Apr 1975 |
DT |
Divisions (1)
|
Number |
Date |
Country |
Parent |
594281 |
Jul 1975 |
|