US3867166A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated metal article and method of making the same
Assignee: Tycon SpA
•
Filing: 1972-07-10
•
Granted: 1975-02-18
•
Expires: 1992-07-10
Abstract
Abstract A method of producing a mixed crystalline-glass coated metal article. A devitrifiable glass frit is initially heat treated to devitrify the frit and produce an amorphous glass matrix containing a multiplicity of devitrified silicate crystals. The devitrified frit is subsequently milled with a corrosion resistant glass frit and the mixture is applied to the metal article. The coated metal article is fired at an elevated temperature to fuse the glass to the metal, and during the firing, the amorphous glass matrix tends to dissolve in the corrosion resistant glass frit. The resulting coating, which is a mixture of glass and crystalline particles, has a high impact resistance and toughness as well as having excellent resistant to corrosive attack.
Inventors
- 👤 James D Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:30
CPC Classifications
C; C23; C23D; C23D5/00; C23D5/04; C03; C03C; C03C10/00; C03C4/00; C23D5/02; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/252
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
141 words
A COMPOSITE STRUCTURE TO BE SUBSEQUENTLY FIRED AT AN ELEVATED TEMPERATURE, COMPRISING A METAL BASE, AND A MIXED FRIT COMPOSITION DISPOSED ON A SURFACE OF THE BASE, SAID COMPOSITION COMPRISING A MIXTURE OF (A) A SUBSTANTIALLY FULLY DEVITRIFIED GLASS FRIT COMPOSED OF AN AMORPHOUS GLASS MATRIX ANDCONTAINING A SUBSTNTIALLY PORTION OF DEVITRIFIED CRYSTALLINE SILICATE PARTICLES AND BEING SUBSTANTIALLY FREE OF CRYSTOBALITE PARTICLES, AND (B) A CORROSION RESISTANT SUBSTNTIALLY NONDEVITRIFIABLE GLASS FRIT CONTAINING FROM 63% TO 80% BY WEIGHT OF SILICA, SAID MIXED FRIT COMPOSITION BEING SUBSEQUENTLY FIRED AT AN ELEVATED TEMPERATURE TO FUSE THE COMPOSITION TO THE METAL, SAID AMORPHOUS GLASS MATRIX TENDING TO DISSOLVE IN SAID CORROSION RESISTANT GLASS FRIT DURING SAID FIRING WHILE RETAINING THE IDENTITY OF THE DEVITRIFIED CRYSTLLINE PARTICLES TO PROVIDE A RESULTING CRYSTLLINE-GLASS COATING HAVING IMPROVED ABRASION RESISTANCE, IMPACT RESISTANCE, AND TOUGHNESS AND EXCELLENT CORROSION RESISTANCE.
Claim 2
Dependent Claim
141 words
A COMPOSITE STRUCTURE TO BE SUBSEQUENTLY FIRED AT AN ELEVATED TEMPERATURE, COMPRISING A METAL BASE, AND A MIXED FRIT COMPOSITION DISPOSED ON A SURFACE OF THE BASE, SAID COMPOSITION COMPRISING A MIXTURE OF (A) A SUBSTANTIALLY FULLY DEVITRIFIED GLASS FRIT COMPOSED OF AN AMORPHOUS GLASS MATRIX ANDCONTAINING A SUBSTNTIALLY PORTION OF DEVITRIFIED CRYSTALLINE SILICATE PARTICLES AND BEING SUBSTANTIALLY FREE OF CRYSTOBALITE PARTICLES, AND (B) A CORROSION RESISTANT SUBSTNTIALLY NONDEVITRIFIABLE GLASS FRIT CONTAINING FROM 63% TO 80% BY WEIGHT OF SILICA, SAID MIXED FRIT COMPOSITION BEING SUBSEQUENTLY FIRED AT AN ELEVATED TEMPERATURE TO FUSE THE COMPOSITION TO THE METAL, SAID AMORPHOUS GLASS MATRIX TENDING TO DISSOLVE IN SAID CORROSION RESISTANT GLASS FRIT DURING SAID FIRING WHILE RETAINING THE IDENTITY OF THE DEVITRIFIED CRYSTLLINE PARTICLES TO PROVIDE A RESULTING CRYSTLLINE-GLASS COATING HAVING IMPROVED ABRASION RESISTANCE, IMPACT RESISTANCE, AND TOUGHNESS AND EXCELLENT CORROSION RESISTANCE.
Claim 3
Dependent Claim
18 words
The structure of claim 1, wherein said devitrified glass frit comprises up to 60% of said frit composition.
Claim 4
Dependent Claim
21 words
The structure of claim 1, wherein said devitrified particles comprise from 50% to 85% by weight of said devitrified glass frit.
Claim 5
Dependent Claim
13 words
The structure of claim 1, wherein said metal base is a ferrous metal.
Claim 6
Dependent Claim
16 words
The structure of claim 3, wherein said crystalline particles have a size less than 10 microns.
Claim 7
Dependent Claim
184 words
A composite structure to be subsequently fired at an elevated temperature, comprising a steel base, and a mixed frit composition disposed on a surface of the base, said composiTion comprising a mixture of (a) a substantially fully devitrified glass frit composed of an amorphous glass matrix and containing a substantial portion of devitrified crystalline silicate particles, said silicate particles comprising from 50% to 85% by weight of said devitrified glass frit and said devitrified glass frit being free of crystobalite particles, and (b) a corrosion resistant substantially non-devitrifiable glass frit containing from 63% to 80% by weight of silica, said devitrified frit comprising from 20% to 50% by weight of said mixed frit composition and the balance being said corrosion resistant glass frit, said mixed frit composition being subsequently fired at an elevated temperature to fuse the composition to the metal, said amorphous glass matrix tending to dissolve in said corrosion resistant glass frit during said firing while retaining the identity of the devitirifed crystalline particles to provide a resulting crystalline-glass coating having improved abrasion resistance, impact resistance, and toughness and excellent corrosion resistance.
Claim 8
Dependent Claim
184 words
A composite structure to be subsequently fired at an elevated temperature, comprising a steel base, and a mixed frit composition disposed on a surface of the base, said composiTion comprising a mixture of (a) a substantially fully devitrified glass frit composed of an amorphous glass matrix and containing a substantial portion of devitrified crystalline silicate particles, said silicate particles comprising from 50% to 85% by weight of said devitrified glass frit and said devitrified glass frit being free of crystobalite particles, and (b) a corrosion resistant substantially non-devitrifiable glass frit containing from 63% to 80% by weight of silica, said devitrified frit comprising from 20% to 50% by weight of said mixed frit composition and the balance being said corrosion resistant glass frit, said mixed frit composition being subsequently fired at an elevated temperature to fuse the composition to the metal, said amorphous glass matrix tending to dissolve in said corrosion resistant glass frit during said firing while retaining the identity of the devitirifed crystalline particles to provide a resulting crystalline-glass coating having improved abrasion resistance, impact resistance, and toughness and excellent corrosion resistance.
Claim 9
Independent Claim
110 words
A METHOD OF COATING A METAL ARTICLE, COMPRISING THE STEP OF SUBSTANTIALLY FULLY DEVITRIFYING A DEVITRIFIABLE GLASS FRIT TO PRODUCE A DEVITRIFIED FRIT COMPOSED OF AN AMORPHOUS GLAS MATRIX AND A PLURALITY OF DEVITRIFIED CRYSTLLINE SILICATE PARTICLES DISPERSED WITHIN SAID MATRIX, SAID DEVITRIFIED GLASS BEING SUBSTANTIALLY FREE OF CRYSTOBALITE PARTICLES, MIXING SAID DEVI TRIFIED GLASS FRIT WITH A CORROSION RESISTANT SUBSTANTIALLY NONDEVITRIFIABLE GLASS FRIT TO PROVIDE A MIXTURE, APPLYING SAID MIXTURE TO THE METAL ARTICLE AS A COATING, AND FIRING SAID ARTIC-CLE AT A TEMPERATURE SUFFICIENTLY HIGH TO FUSE SAID MIXTURE TO SAID METAL ARTICLE, SAID AMORPHOUS GLASS MATRIX TENDING TO DISSOLVE IN SAID CORROSION RESISTANT GLASS FRIT DURING FIRING.
Claim 10
Independent Claim
110 words
A METHOD OF COATING A METAL ARTICLE, COMPRISING THE STEP OF SUBSTANTIALLY FULLY DEVITRIFYING A DEVITRIFIABLE GLASS FRIT TO PRODUCE A DEVITRIFIED FRIT COMPOSED OF AN AMORPHOUS GLAS MATRIX AND A PLURALITY OF DEVITRIFIED CRYSTLLINE SILICATE PARTICLES DISPERSED WITHIN SAID MATRIX, SAID DEVITRIFIED GLASS BEING SUBSTANTIALLY FREE OF CRYSTOBALITE PARTICLES, MIXING SAID DEVI TRIFIED GLASS FRIT WITH A CORROSION RESISTANT SUBSTANTIALLY NONDEVITRIFIABLE GLASS FRIT TO PROVIDE A MIXTURE, APPLYING SAID MIXTURE TO THE METAL ARTICLE AS A COATING, AND FIRING SAID ARTIC-CLE AT A TEMPERATURE SUFFICIENTLY HIGH TO FUSE SAID MIXTURE TO SAID METAL ARTICLE, SAID AMORPHOUS GLASS MATRIX TENDING TO DISSOLVE IN SAID CORROSION RESISTANT GLASS FRIT DURING FIRING.
Claim 11
Independent Claim
138 words
A method of coating a metal article, comprising the step of substantially fully devitrifying a devitrifiable glass frit to produce a devitrified frit composed of an amorphous glass matrix and a plurality of devitrified crystalline silicate particles dispersed within said matrix, said devitrified glass frit being substantially free of crystobalite particles, mixing said devitrified glass frit with a corrosion resistant substantially non-devitrifiable glass frit containing from 63% to 80% by weight of silica to provide a mixture, applying said mixture to the metal article, and firing said article at a temperature sufficiently high to fuse said mixture to said metal article, and for a time sufficient to dissolve at least a substantial portion of said amorphous glass matrix in said corrosion resistant glass frit while retaining the identify of the devitrified crystalline particles to provide a strystalline-glass coating.
Claim 12
Independent Claim
138 words
A method of coating a metal article, comprising the step of substantially fully devitrifying a devitrifiable glass frit to produce a devitrified frit composed of an amorphous glass matrix and a plurality of devitrified crystalline silicate particles dispersed within said matrix, said devitrified glass frit being substantially free of crystobalite particles, mixing said devitrified glass frit with a corrosion resistant substantially non-devitrifiable glass frit containing from 63% to 80% by weight of silica to provide a mixture, applying said mixture to the metal article, and firing said article at a temperature sufficiently high to fuse said mixture to said metal article, and for a time sufficient to dissolve at least a substantial portion of said amorphous glass matrix in said corrosion resistant glass frit while retaining the identify of the devitrified crystalline particles to provide a strystalline-glass coating.
Claim 13
Dependent Claim
23 words
The method of claim 8, wherein said devitrifiable glass frit is devitrified by heating said frit to a temperature ofo 1,000*F to 1,600*F.
Claim 14
Dependent Claim
36 words
The method of claim 8, wherein said mixing is accomplished by milling said frits together, the milled mixture having a particle size such that at least 85% of said particles pass through a 200 mesh sieve.
Claim 15
Dependent Claim
21 words
The method of claim 8, wherein said metal article is fired at a temperature in the range of 1,400*F to 1,700*F.
Claim 16
Independent Claim
163 words
A method of coating a steel base, comprising the steps of heating a devitrifiable glass frit to a temperature sufficiently high to substantially fully devitrify the frit, the devitirifed frit comprising an amorphous glass matrix having dispersed therein a plurality of devitrified silicate crystals and being substantially free of crystobalite particles, said crystals comprising at least 50% by weight of said devitrified frit, mixing the devitirifed frit with a corrosion resistant substantially non-devitrifiable frit with said devitrified frit comprising up to 60% by weight of the mixture, applying the mixture to the steel base, and firing the steel base at a temperature in the raNge of 1,400*F to 1,700*F for a period of time sufficient to dissolve at least a substantial portion of said amorphous glass matrix in said corrosion resistant glass while retaining the identity of the devitrified crystalline particles to produce a resulting mixed crystalline-amorphous glass coating having improved abrasion resistance, shock resistance and toughness, and excellent resistance to corrosive attack.
Claim 17
Independent Claim
163 words
A method of coating a steel base, comprising the steps of heating a devitrifiable glass frit to a temperature sufficiently high to substantially fully devitrify the frit, the devitirifed frit comprising an amorphous glass matrix having dispersed therein a plurality of devitrified silicate crystals and being substantially free of crystobalite particles, said crystals comprising at least 50% by weight of said devitrified frit, mixing the devitirifed frit with a corrosion resistant substantially non-devitrifiable frit with said devitrified frit comprising up to 60% by weight of the mixture, applying the mixture to the steel base, and firing the steel base at a temperature in the raNge of 1,400*F to 1,700*F for a period of time sufficient to dissolve at least a substantial portion of said amorphous glass matrix in said corrosion resistant glass while retaining the identity of the devitrified crystalline particles to produce a resulting mixed crystalline-amorphous glass coating having improved abrasion resistance, shock resistance and toughness, and excellent resistance to corrosive attack.
References Cited (Backward Citations)
US3368712A
Cited
US3361588A
Cited
US3458301A
Cited
US3462252A
Cited
US3184320A
Cited
US3507687A
Cited
US3560327A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |