US4287260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cordierite crystal-containing glaze
Assignee: Anchor Hocking LLC
•
Filing: 1980-07-28
•
Granted: 1981-09-01
•
Expires: 2000-07-28
Abstract
Abstract A cordierite crystal-containing glaze for fine ceramics such as cordierite ceramics. The glaze has an oxide composition comprising, ______________________________________ SiO 2 66-75 wt. % Al 2 O 3 13-22 MgO 3-8 B 2 O 3 2.5-7 Na 2 O + K 2 O .4-2.0 ______________________________________ The above components should comprise at least 95%, and preferably 96-99%, of the total. The glaze can also include 0-2% ZnO and 0∝2% ZrO 2 . Apart from colorants, the balance, if any, may comprise small amounts of other compatible compounds such as CaO, SrO, BaO, Cs 2 O and F 2 , up to a total of 3%; but the ratio of SiO 2 +Al 2 O 3 +MgO to the sum of such other compatible compounds should be at least about 28:1. Fe 2 O 3 and TiO 2 , which are generally present as impurities in standard batch raw materials, are not harmful in amounts less than a total of 1.5%; in greater amounts, they begin to alter the color of the glaze. Li 2 O should not be present in any amount greater than about 0.5%. The glaze has good gloss and durability and is transparent in the absence of added pigmentation or refractory particles.
Inventors
- 👤 Paul D. Prall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:54
CPC Classifications
C; C03; C03C; C03C8/00; C03C8/02; C03C8/04; C03C8/06; C03C2205/00; C03C2205/02; C03C2209/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31; Y10T428/315
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
142 words
A low expansion ceramic body having fired thereon a fused glaze which has an oxide composition consisting essentially of ______________________________________
SiO.sub.2 66-75 wt. %
Al.sub.2 O.sub.3 13-22
MgO 3-8
B.sub.2 O.sub.3 2.5-7
Na.sub.2 O + K.sub.2 O
.4-2.0
______________________________________ the above listed components totaling at least 95% of the composition, and Li 2 O is not more than 0.5%, the total of Fe 2 O 3 and TiO 2 is not more than 1.5%, and at least one of ZnO and ZnO 2 is included in an amount less than 2%, said glaze having a ratio (SiO 2 +Al 2 O 3 +MgO)/(CaO+ SrO+BaO+Cs 2 O+F 2 ) which is at least about 28:1, said glaze containing cordierite crystals as the major crystalline phase therein and the exterior of the glaze is richer in SiO 2 than the interior of the glaze.
Claim 2
Dependent Claim
142 words
A low expansion ceramic body having fired thereon a fused glaze which has an oxide composition consisting essentially of ______________________________________
SiO.sub.2 66-75 wt. %
Al.sub.2 O.sub.3 13-22
MgO 3-8
B.sub.2 O.sub.3 2.5-7
Na.sub.2 O + K.sub.2 O
.4-2.0
______________________________________ the above listed components totaling at least 95% of the composition, and Li 2 O is not more than 0.5%, the total of Fe 2 O 3 and TiO 2 is not more than 1.5%, and at least one of ZnO and ZnO 2 is included in an amount less than 2%, said glaze having a ratio (SiO 2 +Al 2 O 3 +MgO)/(CaO+ SrO+BaO+Cs 2 O+F 2 ) which is at least about 28:1, said glaze containing cordierite crystals as the major crystalline phase therein and the exterior of the glaze is richer in SiO 2 than the interior of the glaze.
Claim 3
Dependent Claim
47 words
The article of claim 1 wherein said glaze has the composition, ______________________________________
SiO.sub.2 71.0 wt. %
Al.sub.2 O.sub.3
15.3
MgO 6.8
B.sub.2 O.sub.3
3.7
Na.sub.2 O .8
K.sub.2 O .2
ZnO 1.1
ZrO.sub.2 .3
______________________________________ the balance being CaO, Fe 2 O 3 and TiO 2 .
Claim 4
Dependent Claim
16 words
The article of claim 1 or 2 wherein said body is a cordierite low expansion ceramic.
Claim 5
Dependent Claim
53 words
The article of claim 3 wherein the ceramic body has an oxide composition comprising, ______________________________________
SiO.sub.2 33-46 wt. %
Al.sub.2 O.sub.3 37-57
MgO 5.5-15
ZnO .4-1.7
Na.sub.2 O + K.sub.2 O
1.0-3.0
ZrO.sub.2 0-5
______________________________________ the foregoing oxides totaling at least 97% of said body, said body containing essentially no Li 2 O.
Claim 6
Dependent Claim
38 words
The article of claim 4 wherein the composition of said ceramic comprises, ______________________________________
SiO.sub.2 39-40 wt. %
Al.sub.2 O.sub.3 45-46
MgO 11-12
ZnO .7-1.0
Na.sub.2 O 1.0-1.4
K.sub.2 O .4-.6
CaO .2-.4
Fe.sub.2 O.sub.3 0-.5
TiO.sub.2 0-.5
______________________________________
Claim 7
Dependent Claim
10 words
The article of claim 1 wherein said glaze is transparent.
Claim 8
Dependent Claim
34 words
The article of claim 1 wherein the crystalline content of the glaze is most dense adjacent the interface between the glaze and the body, and the outer surface of the glaze is substantially non-crystalline.
Claim 9
Dependent Claim
18 words
The article of claim 1 wherein the listed components total 96-99% of the oxide composition of said glaze.
Claim 10
Dependent Claim
132 words
A glaze having an oxide composition consisting essentially of ______________________________________
SiO.sub.2 66-75 wt. %
Al.sub.2 O.sub.3 13-22
MgO 3-8
B.sub.2 O.sub.3 2.5-7
Na.sub.2 O + K.sub.2 O
.4-2.0
______________________________________ the above-listed components totaling at least 95% of the composition, and Li 2 O is not more than 0.5%, the total of Fe 2 O 3 and TiO 2 is not more than 1.5%, and at least one of ZnO and ZrO 2 is included in an amount less than 2%, the ratio (SiO 2 +Al 2 O 3 +MgO)/(CaO+SrO+Ba0+Cs 2 O+F 2 ) exceeding at least about 28:1, said glaze when fired on a ceramic body containing cordierite crystals as the major crystal phase therein and the exterior of the glaze is richer in SiO 2 than the interior of the glaze.
Claim 11
Dependent Claim
132 words
A glaze having an oxide composition consisting essentially of ______________________________________
SiO.sub.2 66-75 wt. %
Al.sub.2 O.sub.3 13-22
MgO 3-8
B.sub.2 O.sub.3 2.5-7
Na.sub.2 O + K.sub.2 O
.4-2.0
______________________________________ the above-listed components totaling at least 95% of the composition, and Li 2 O is not more than 0.5%, the total of Fe 2 O 3 and TiO 2 is not more than 1.5%, and at least one of ZnO and ZrO 2 is included in an amount less than 2%, the ratio (SiO 2 +Al 2 O 3 +MgO)/(CaO+SrO+Ba0+Cs 2 O+F 2 ) exceeding at least about 28:1, said glaze when fired on a ceramic body containing cordierite crystals as the major crystal phase therein and the exterior of the glaze is richer in SiO 2 than the interior of the glaze.
Claim 12
Independent Claim
150 words
The method of glazing a ceramic body comprising, preparing a glaze having an oxide composition consisting essentially of ______________________________________
SiO.sub.2 66-75 wt. %
Al.sub.2 O.sub.3 13-22
MgO 3-8
B.sub.2 O.sub.3 2.5-7
Na.sub.2 O + K.sub.2 O
.4-2.0
______________________________________ the above-listed components totaling at least 95% of the composition, and Li 2 O is not more than 0.5%, the total of Fe 2 O 3 and TiO 2 is not more than 1.5%, and at least one of ZnO and ZrO 2 is included in an amount less than 2% the ratio (SiO 2 +Al 2 O 3 +MgO)/(CaO+SrO 2 +BaO+Cs 2 O+F 2 ) exceeding about 28:1, applying the glaze to ceramic body, and firing the glaze on the body, the glaze developing cordierite as the major crystalline phase therein during said firing and the exterior of the glaze is richer in SiO 2 than the interior of the glaze.
Claim 13
Independent Claim
150 words
The method of glazing a ceramic body comprising, preparing a glaze having an oxide composition consisting essentially of ______________________________________
SiO.sub.2 66-75 wt. %
Al.sub.2 O.sub.3 13-22
MgO 3-8
B.sub.2 O.sub.3 2.5-7
Na.sub.2 O + K.sub.2 O
.4-2.0
______________________________________ the above-listed components totaling at least 95% of the composition, and Li 2 O is not more than 0.5%, the total of Fe 2 O 3 and TiO 2 is not more than 1.5%, and at least one of ZnO and ZrO 2 is included in an amount less than 2% the ratio (SiO 2 +Al 2 O 3 +MgO)/(CaO+SrO 2 +BaO+Cs 2 O+F 2 ) exceeding about 28:1, applying the glaze to ceramic body, and firing the glaze on the body, the glaze developing cordierite as the major crystalline phase therein during said firing and the exterior of the glaze is richer in SiO 2 than the interior of the glaze.
Claim 14
Dependent Claim
47 words
The method of claim 10 wherein said glaze has the composition, ______________________________________
SiO.sub.2 71.0 wt. %
Al.sub.2 O.sub.3
15.3
MgO 6.8
B.sub.2 O.sub.3
3.7
Na.sub.2 O .8
K.sub.2 O .2
ZnO 1.1
ZrO.sub.2 .3
______________________________________ the balance being CaO, Fe 2 O 3 and TiO 2 .
Claim 15
Dependent Claim
12 words
The method of claim 10 wherein said body is a cordierite ceramic.
Claim 16
Dependent Claim
52 words
The method of claim 12 wherein the ceramic body has the oxide composition, ______________________________________
SiO.sub.2 33-46 wt. %
Al.sub.2 O.sub.3 37-57
MgO 5.5-15
ZnO .4-1.7
Na.sub.2 O + K.sub.2 O
1.0-3.0
ZrO.sub.2 0-5
______________________________________ the foregoing oxides totaling at least 97% of said body, said body containing essentially no Li 2 0.
Claim 17
Dependent Claim
39 words
The method of claim 3 wherein the cordierite ceramic body has the composition, ______________________________________
SiO.sub.2 39-40 wt. %
Al.sub.2 O.sub.3 45-46
MgO 11-12
ZnO .7-1.0
Na.sub.2 O 1.0-1.4
K.sub.2 O .4-.6
CaO .2-.4
Fe.sub.2 O.sub.3 0-.5
TiO.sub.2 0-.5
______________________________________
Claim 18
Dependent Claim
46 words
The method of claim 10 wherein the glaze is prepared by steps comprising melting a glass batch and quenching it to form a frit, and mixing the frit with an inorganic suspending agent, the mixture of frit and suspending agent having the oxide composition set forth.
Claim 19
Dependent Claim
19 words
The method of claim 15 wherein the suspending agent is selected from the group consisting of kaolin and bentonite.
Claim 20
Dependent Claim
41 words
The method of claim 16 including the further step of mixing the frit with a modifying agent selected from the group consisting of alumina and flint, the mixture of frit, suspending agent and modifying agent having the oxide composition set forth.
Claim 21
Dependent Claim
30 words
The method of claim 10 wherein the body has been bisque fired prior to the application of the glaze thereto, the firing of the glaze thereon comprising a second firing.
Claim 22
Dependent Claim
12 words
The article of claim 1, wherein the glaze also includes a colorant.
References Cited (Backward Citations)
US3380838A
Cited
US3384508A
Cited
US3499787A
Cited
US3532524A
Cited
US3713877A
Cited
US3846098A
Cited
US3840394A
Cited
US4015048A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |