US4942146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dense ceramic alloys and process of making same
Assignee: Skyworks Solutions Inc
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Filing: 1987-05-15
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Granted: 1990-07-17
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Expires: 2007-05-15
Abstract
Abstract A method of fine-tuning the dielectric constant value of an insulating ceramic alloy, and the resulting alloy, and uses thereof, are disclosed. The alloy has the general formula: MgxAlyTizO4 wherein x+y+z=3 x=1-2 y=0.1-1.9 z=0.1-0.9 and is preferably made from 10 to 90 mol percent of magnesium titanate and 90 to 10 mol percent of magnesium aluminate. The mole ratio of the titanate to the aluminate in the alloy is varied in order to vary the value of the dielectric constant of the alloy. The alloy has a density which is at least 98% of the theoretical density of the alloy, and a dielectric constant of 8.5 to 13.8. The alloy can be used in applications wherein dielectric materials have previously been utilized, such as a substrate for an electrical circuit.
Inventors
- 👤 Taki Negas
- 👤 Louis P. Domingues
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:02
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; H05K3/00; H05K3/46; H05K3/4644; H05K3/4673; H05K3/4676
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
44 words
A single phase dense sintered ceramic dielectric alloy of the formula: Mg.sub.x Al.sub.y Ti.sub.z O.sub.4 wherein x+y+z=3 x=1-2 y=0.1-1.9 z=0.1-0.9 having a dielectric constant of at least 8.5 and no more than 13.8 and a density of at least 98% of the theoretical density.
Claim 2
Dependent Claim
44 words
A single phase dense sintered ceramic dielectric alloy of the formula: Mg.sub.x Al.sub.y Ti.sub.z O.sub.4 wherein x+y+z=3 x=1-2 y=0.1-1.9 z=0.1-0.9 having a dielectric constant of at least 8.5 and no more than 13.8 and a density of at least 98% of the theoretical density.
Claim 3
Dependent Claim
16 words
Alloy of claim 1, wherein said density is at least about 99% of the theoretical density.
Claim 4
Dependent Claim
18 words
Alloy of claim 1, wherein the alloy has a fired density of at least 3.49 g/cm 3 .
Claim 5
Dependent Claim
18 words
Alloy of claim 1, wherein said alloy has a fired density of 3.50 to 3.66 g/cm 3 .
Claim 6
Dependent Claim
15 words
Alloy of claim 1, wherein said alloy has a dielectric constant of 8.5 to 13.0.
Claim 7
Dependent Claim
15 words
Alloy of claim 1, wherein said alloy has a dielectric constant of 9.2 to 10.4.
Claim 8
Independent Claim
74 words
A method of modifying magnesium aluminate to lower the firing temperature thereof by at least 150° C. while maintaining a single phase sintered ceramic material to produce a densified sintered magnesium aluminum titanate having a low dielectric constant which is suitable for use as a substrate in stacks of printed circuits, said method comprising adding from 10 to 90 volume percent of magnesium titanate to the magnesium aluminate prior to firing to sinter same.
Claim 9
Independent Claim
74 words
A method of modifying magnesium aluminate to lower the firing temperature thereof by at least 150° C. while maintaining a single phase sintered ceramic material to produce a densified sintered magnesium aluminum titanate having a low dielectric constant which is suitable for use as a substrate in stacks of printed circuits, said method comprising adding from 10 to 90 volume percent of magnesium titanate to the magnesium aluminate prior to firing to sinter same.
Claim 10
Dependent Claim
16 words
Method of claim 7, wherein the firing is at a temperature of 1325° to 1450° C.
Claim 11
Dependent Claim
12 words
Method of claim 8, wherein said temperature is 1400° to 1450° C.
Claim 12
Dependent Claim
23 words
Method of claim 7, wherein the materials are fired in an oxygen atmosphere having a gas gauge pressure of 0.7 to 5 atmospheres.
Claim 13
Independent Claim
47 words
A method of electrically insulating two spaced points, said method comprising interposing between said points an insulating single phase sintered ceramic alloy layer having a thickness of at least 0.005 inches, said alloy consisting essentially of the formula: Mg.sub.x Al.sub.y Ti.sub.z O.sub.4 wherein x+y+z=3 x=1-2 y=0.1-1.9 z=0.1-0.9
Claim 14
Independent Claim
47 words
A method of electrically insulating two spaced points, said method comprising interposing between said points an insulating single phase sintered ceramic alloy layer having a thickness of at least 0.005 inches, said alloy consisting essentially of the formula: Mg.sub.x Al.sub.y Ti.sub.z O.sub.4 wherein x+y+z=3 x=1-2 y=0.1-1.9 z=0.1-0.9
Claim 15
Dependent Claim
48 words
A single phase sintered substrate for an electrical circuit, said substrate consisting essentially an alloy of the formula: Mg.sub.x Al.sub.y Ti.sub.z O.sub.4 wherein x+y+z=3 x=1-2 y=0.1-1.9 z=0.1-0.9 having at least one surface thereof which contacts said electrical circuit finished to a surface profile of less than 4 microinches.
Claim 16
Dependent Claim
48 words
A single phase sintered substrate for an electrical circuit, said substrate consisting essentially an alloy of the formula: Mg.sub.x Al.sub.y Ti.sub.z O.sub.4 wherein x+y+z=3 x=1-2 y=0.1-1.9 z=0.1-0.9 having at least one surface thereof which contacts said electrical circuit finished to a surface profile of less than 4 microinches.
Claim 17
Dependent Claim
52 words
An electrical device having a single phase sintered ceramic insulator which has dielectric constant of about 8.5 to about 13.8, said ceramic insulator consisting essentially of an alloy of the formula: Mg.sub.x Al.sub.y Ti.sub.z O.sub.4 wherein x+y+z=3 x=1-2 y=0.1-1.9 z=0.1-0.9 said alloy having a density which is at least 98% of theoretical.
Claim 18
Dependent Claim
52 words
An electrical device having a single phase sintered ceramic insulator which has dielectric constant of about 8.5 to about 13.8, said ceramic insulator consisting essentially of an alloy of the formula: Mg.sub.x Al.sub.y Ti.sub.z O.sub.4 wherein x+y+z=3 x=1-2 y=0.1-1.9 z=0.1-0.9 said alloy having a density which is at least 98% of theoretical.
Claim 19
Dependent Claim
27 words
Device of claim 13, wherein said device is a circulator, a phase shifter for microwave and millimeter wave systems, a multilayer digital circuit, or a Farraday rotator.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-07-16 | 1994-01-15 | 1994-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-16 | 1998-01-15 | 1998-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-16 | 2002-01-15 | 2002-07-17 | $7700.00 | Window Closed / Lapsed |