US5045402A
Expired / Lapsed
US
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Zirconia toughening of glass-ceramic materials
Assignee: International Business Machines Corp
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Filing: 1989-05-09
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Granted: 1991-09-03
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Expires: 2009-05-09
Abstract
Abstract A ceramic material suitable for packaging of large scale integrated circuits is produced by the process of forming a mixture of a powdered glass ceramic material which is a glassy precursor to cordierite ceramic material, formed by the steps which are as follows: a. Mix tetragonal phase material selected from the group consisitng of zirconia or hafnia powder containing a stabilizing oxide compound selected from the group consisting of MgO, CaO and Y2O3 and a glass frit powder or frit of a glassy precursor of cordierite glass ceramic to yield a suspension of solids. Preferably, a binder is included. b. Disperse the suspended solids to yield a dispersion of the zirconia or hafnia with the stabilizing oxide compound and the glassy precursor. c. Densify the dispersion of zirconia or hafnia with the stabilizing oxide compound and the glassy precursor by a sintering heat treatment at a temperature of about 840 DEG C. to melt the glassy precursor into a viscous fluid at a temperature below the melting point of the zirconia or hafnia powder particles to yield a densified intermediate material with the zirconia or hafnia particles encapsulated in the molden glassy percursor. d. Crystallize the densified intermediate material into a polycrystalline composite by heating at 900 DEG C. to 950 DEG C. The process yields a ceramic material consisting of the tetragonal phase material encapsulated in crystalline cordierite glass ceramic material. This invention is a continuation in part of application Ser. No. 07/146,455 filed on Jan. 21, 1988 now abandoned which was a continuation of Ser. No. 06/892,687 filed Aug. 1, 1986 now abandoned.
Inventors
- 👤 Richard W. Adams, Jr.
- 👤 David R. Clarke
- 👤 Sara H. Knickerbocker
- 👤 Linda L. Rapp
- 👤 Bernard Schwartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:09
CPC Classifications
H; H10; H10W; H10W99/00; C; C03; C03C; C03C10/00; C03C10/0036; C03C10/0045; C03C14/00; C03C14/004; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/18; C04B35/195; C03C2214/00; C03C2214/04; C03C2214/20; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12007; Y10T428/12493; Y10T428/12535; Y10T428/12611; Y10T428/12618; Y10T428/12771; Y10T428/12861; Y10T428/12903
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
157 words
An article at least a part of which comprises: a ceramic body consisting essentially of at least about 75 volume percent of a dielectric glass ceramic and the remainder being a finite amount of a material selected from the group consisting of ZrO 2 , HfO 2 and a mixture thereof in the form of particles having a size between about 0.5 and about 8.0 microns, said particles having a tetragonal crystalline structure and being sufficiently dispersed within said ceramic body to increase the fracture toughness of said ceramic body; said material further containing an oxide compound selected from the group consisting of MgO, CaO, Y 2 O 3 , TiO 2 and rare earth oxides, there being at least enough of said oxide to stabilize said tetragonal structure of said material, and an electrical conductor pattern within said ceramic body, said conductor pattern having a melting temperature greater than the crystallization temperature of said glass ceramic.
Claim 2
Dependent Claim
157 words
An article at least a part of which comprises: a ceramic body consisting essentially of at least about 75 volume percent of a dielectric glass ceramic and the remainder being a finite amount of a material selected from the group consisting of ZrO 2 , HfO 2 and a mixture thereof in the form of particles having a size between about 0.5 and about 8.0 microns, said particles having a tetragonal crystalline structure and being sufficiently dispersed within said ceramic body to increase the fracture toughness of said ceramic body; said material further containing an oxide compound selected from the group consisting of MgO, CaO, Y 2 O 3 , TiO 2 and rare earth oxides, there being at least enough of said oxide to stabilize said tetragonal structure of said material, and an electrical conductor pattern within said ceramic body, said conductor pattern having a melting temperature greater than the crystallization temperature of said glass ceramic.
Claim 3
Dependent Claim
11 words
The article of claim 1, wherein said conductor pattern contains copper.
Claim 4
Dependent Claim
20 words
The article of claim 1, wherein said ceramic body is at least a part of a surface of said article.
Claim 5
Dependent Claim
14 words
The articles of claim 1, wherein said glass ceramic is a cordierite glass ceramic.
Claim 6
Dependent Claim
20 words
The article of claim 1, wherein said oxide compound is from about 0.1 to 8.0 mole percent of said material.
Claim 7
Dependent Claim
18 words
The article of claim 1, wherein said conductor pattern has a melting temperature less than about 1100° C.
Claim 8
Dependent Claim
38 words
The article of claim 1, wherein said glass ceramic contains crystal phases selected from the group consisting of cordierite, spodumene, eucryptite, enstatite, celsian, wollastonite, willemite, anorthite, lithium disilicate, lithium metasilicate, mullite, combinations thereof, and combinations thereof with alumina.
Claim 9
Dependent Claim
33 words
The article of claim 1, wherein said crystallization temperature is a specific temperature less than about 1100° C. and wherein said melting temperature of said conductor pattern is greater then said specific temperature.
Claim 10
Dependent Claim
15 words
The article of claim 2, wherein said crystallization temperature is less than about 1100° C.
Claim 11
Dependent Claim
11 words
The article of claim 7, wherein said conducter pattern contains copper.
Claim 12
Dependent Claim
15 words
The article of claim 10, wherein said crystallization temperature is less then about 1100° C.
Claim 13
Dependent Claim
152 words
An article at least a part of which comprises: a ceramic body consisting essentially of at least about 75 volume percent of a cordierite glass ceramic and the remainder being a finite amount of a material selected from the group consisting of ZrO 2 HfO 2 and a mixture thereof in the form of particles having a size between about 0.5 to 8.0 microns, said particles having a tetragonal crystalline structure and being sufficiently dispersed within said ceramic body to increase the fracture toughness of said ceramic body; said material further containing an oxide compound selected from the group consisting of MgO, CaO, Y 2 O 3 , TiO 2 and rare earth oxides, there being at least enough of said oxide to stabilize said tetragonal structure of said material; and an electrical conductor pattern, within said ceramic body, having a melting temperature greater than the crystallization temperature of said glass ceramic.
Claim 14
Dependent Claim
152 words
An article at least a part of which comprises: a ceramic body consisting essentially of at least about 75 volume percent of a cordierite glass ceramic and the remainder being a finite amount of a material selected from the group consisting of ZrO 2 HfO 2 and a mixture thereof in the form of particles having a size between about 0.5 to 8.0 microns, said particles having a tetragonal crystalline structure and being sufficiently dispersed within said ceramic body to increase the fracture toughness of said ceramic body; said material further containing an oxide compound selected from the group consisting of MgO, CaO, Y 2 O 3 , TiO 2 and rare earth oxides, there being at least enough of said oxide to stabilize said tetragonal structure of said material; and an electrical conductor pattern, within said ceramic body, having a melting temperature greater than the crystallization temperature of said glass ceramic.
Claim 15
Dependent Claim
38 words
The article of claim 9, wherein said glass ceramic contains crystal phases selected from the group consisting of cordierite, spodumene, eucryptite, enstatite, celsian, wollastonite, willemite, anorthite, lithium disilicate, lithium metasilicate, mullite, combinations thereof, and combinations thereof with alumina.
References Cited (Backward Citations)
US3205079A
Cited
US3873329A
Cited
US4298385A
Cited
US4234367A
Cited
US4421861A
Cited
US4292083A
Cited
US4316964A
Cited
US4396682A
Cited
US4429051A
Cited
US4358516A
Cited
US4506024A
Cited
US4587224A
Cited
US4624934A
Cited
US4855259A
Cited
US4687749A
Cited
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