EP0289903A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Ceramic coated metal subtrates for electronic applications
Assignee: Honeywell International Inc
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Filing: 1988-04-25
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Granted: —
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Expires: 2008-04-25
Abstract
Abstract The present invention is directed to a ceramic (16) coated metal (12) substrate having improved processibility characteristics in the manufacture of electronic devices, as for example electronic circuits, and to processes for manufacture of such devices. The coating is made of a glass/ceramic comprising (on an oxide basis and based on on the total weight of the coatings): (a) from about 8 to about 26% by weight of magnesium oxide (MgO); (b) from about 10% to about 49% by weight of aluminum oxide (Al₂O₃); and (c) from about 42 to about 68% by weight of silicon oxide (SiO₂). The main crystalline phase is cordierite.
Inventors
- 👤 Reza M. Oboodi
- 👤 Daniel C. Blazej
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 22:33
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/05; H05K1/053; C; C03; C03C; C03C10/00; C03C10/0036; C03C10/0045; C03C8/00; C03C8/02; H10; H10W; H10W70/00; H10W70/60; H10W70/67; H10W70/69; H10W70/692; Y; Y10; Y10S; Y10S428/00; Y10S428/901
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
82 words
A glass/ceramic coated substrate having a metal core and having on at least a portion of the surface of the metal core a coating of a glass/ceramic comprising (on an oxide basis and based on on the total weight of the coatings): (a) from about 8 to about 26% by weight of magnesium oxide (MgO); (b) from about 10% to about 49% by weight of aluminum oxide (Al₂O₃); and (c) from about 42 to about 68% by weight of silicon oxide (SiO₂).
Claim 2
Dependent Claim
82 words
A glass/ceramic coated substrate having a metal core and having on at least a portion of the surface of the metal core a coating of a glass/ceramic comprising (on an oxide basis and based on on the total weight of the coatings): (a) from about 8 to about 26% by weight of magnesium oxide (MgO); (b) from about 10% to about 49% by weight of aluminum oxide (Al₂O₃); and (c) from about 42 to about 68% by weight of silicon oxide (SiO₂).
Claim 3
Dependent Claim
13 words
A glass/ceramic substrate according to claim 1 wherein said coating comprises cordierete (2MgO-2Al₂O₃-5SiO₂).
Claim 4
Dependent Claim
17 words
A glass/ceramic coated substrate according to claim 1 wherein said coating comprises cordierete (2MgO-2Al₂O₃-5SiO₂) and sapphirine (4MgO-5Al₂O₃-2SiO₂).
Claim 5
Dependent Claim
54 words
A glass/ceramic coated substrate according to claim 1 wherein said coating further comprises (on an oxide basis): (d) from about 3 to about 15% by weight, based on the total weight of MgO, Al₂O₃ and SiO₂ in the coating of one or more alkali metal or alkaline earth metal oxides, and a boron oxide.
Claim 6
Dependent Claim
17 words
A glass/ceramic coated substrate according to claim 4 wherein said coating comprises cordierete (2MgO-2Al₂O₃-5SiO₂) and spodumene (Li₂O-Al₂O₃-4SiO₂).
Claim 7
Dependent Claim
49 words
A glass/ceramic coated substrate according to claim 4 wherein said coating comprises cordierete (2MgO-2Al₂O₃-5SiO₂), spodumene (li₂O-Al₂O₃-4SiO₂), and sapphirine (4MgO-5Al₂O₃-2SiO₂). which further comprises (on an oxide basis): (d) from about 7 to about 9% by weight of one or more alkali metal and/or alkaline earth metal oxides, and boron oxides.
Claim 8
Dependent Claim
47 words
A glass/ceramic coated substrate according to claim 1 which further comprises (on an oxide basis) (e) up to about 11% by weight based on the total weight of Al2O₃, SiO₃, SiO₂ and MgO of a transition or transition earth metal oxide which functions as a nucleating agent.
Claim 9
Dependent Claim
103 words
A glass/ceramic coated substrate according to claim 1 said coating consisting essentially of (on an oxide basis and based on the total weight of the coating): (a) from about 9 to about 23 weight percent of magnesium oxide; (b) from about 19 to about 48 weight percent of aluminum oxide; (c) from about 36 to about 47 weight percent of silicon dioxide; (d) from about 1 to about 3 weight percent of lithium oxide; (e) from about 4 to about 13 weight percent of a boron oxide; and (f) from about 0 to about 11 weight percent of titanium dioxide or zirconium oxide.
Claim 10
Dependent Claim
82 words
A glass/ceramic coated circuit board which comprises a metal substrate having coated on at least a portion of the surface thereof a glass/ceramic coating and having defined on at least a portion of the surface of the coating an electrical circuit, said coating comprising (on an oxide basis): (a) from about 8 to about 26% by weight of MgO; (b) from about 10 to about 49% by weight of Al₂O₃; and (c) from about 42 to about 68% by weight of SiO₂.
Claim 11
Dependent Claim
82 words
A glass/ceramic coated circuit board which comprises a metal substrate having coated on at least a portion of the surface thereof a glass/ceramic coating and having defined on at least a portion of the surface of the coating an electrical circuit, said coating comprising (on an oxide basis): (a) from about 8 to about 26% by weight of MgO; (b) from about 10 to about 49% by weight of Al₂O₃; and (c) from about 42 to about 68% by weight of SiO₂.
Claim 12
Dependent Claim
79 words
An electronic substrate comprising: (a) a metal substrate; (b) a glass ceramic comprising (on an oxide basis): (i) from about 8 to about 26% by weight of MgO; (ii) from about 10 to about 49% by weight of Al₂O₃; and (iii) from about 42 to about 68% by weight of SiO₂; and (c) a layer of a conductive material heat bonded and sintered to all or a portion of the surfaces of said glass/ceramic coating in a pre-determined pattern.
Claim 13
Dependent Claim
79 words
An electronic substrate comprising: (a) a metal substrate; (b) a glass ceramic comprising (on an oxide basis): (i) from about 8 to about 26% by weight of MgO; (ii) from about 10 to about 49% by weight of Al₂O₃; and (iii) from about 42 to about 68% by weight of SiO₂; and (c) a layer of a conductive material heat bonded and sintered to all or a portion of the surfaces of said glass/ceramic coating in a pre-determined pattern.
References Cited (Backward Citations)
EP0016307A1
Cited
EP0080345A1
Cited
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