GB2287933A - Glazing ceramic materials - Google Patents
Glazing ceramic materials Download PDFInfo
- Publication number
- GB2287933A GB2287933A GB9405586A GB9405586A GB2287933A GB 2287933 A GB2287933 A GB 2287933A GB 9405586 A GB9405586 A GB 9405586A GB 9405586 A GB9405586 A GB 9405586A GB 2287933 A GB2287933 A GB 2287933A
- Authority
- GB
- United Kingdom
- Prior art keywords
- weight
- balance
- powder
- glazing
- manganese dioxide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C8/00—Enamels; Glazes; Fusion seal compositions being frit compositions having non-frit additions
- C03C8/02—Frit compositions, i.e. in a powdered or comminuted form
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5022—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with vitreous materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
- C04B41/81—Coating or impregnation
- C04B41/85—Coating or impregnation with inorganic materials
- C04B41/86—Glazes; Cold glazes
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Structural Engineering (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Glass Compositions (AREA)
Abstract
A vitreous glaze is formed on ceramic materials, eg reaction-bonded silicon nitride. The glaze is formed from a glazing mixture comprising a powder in a suitable binder, wherein the powder comprises: 15 to 40% by weight of silica, 10 to 35% by weight of alumina, and a balance comprising manganese dioxide and ferric oxide, the manganese dioxide forming 15 to 80% by weight of said balance.
Description
GLAZING CERAMIC MATERIALS
This invention is concerned with glazing ceramic materials and, in particular, with glazing mixtures and with methods of forming vitreous glaze on a surface of an article made of ceramic material.
Ceramic materials have an adherent porosity which can be disadvantageous when the ceramic material is used in contact with liquid and, in a hostile environment can lead to corrosion of the ceramic material. For example, when the ceramic material is exposed to high temperatures, oxididation may occur. In order to prevent the porosity of the ceramic material leading to corrosion thereof, it is known to glaze the surface of the ceramic material to seal said porosity. One such glaze which is intended for use with reaction-bonded silicon nitride is described in
GB 2 230 522 A. This known glaze comprises 35 to 45% by weight of manganese dioxide, 20 to 40% by weight of an alumina based composition having enhanced firing properties, and 30 to 40% by weight of silica together with a suitable binder.This known glaze is successful in many applications but it is desirable to provide an improved glaze which will allow an extension of the possible applications.
It is an object of the present invention to provide an improved glazing mixture which can be used to glaze ceramic materials such as reaction-bonded silicon nitride.
The invention provides a glazing mixture comprising a powder in a suitable binder, wherein the powder comprises:
15 to 40% by weight of silica,
10 to 35% by weight of alumina,
and a balance comprising manganese dioxide and ferric
oxide, the manganese dioxide forming 15 to 80% of said
balance.
A grazing mixture according to the invention is found to provide, when fired, a vitreous glaze which is resistant to a wider range of hostile environments than the prior art glaze described above. This glazing mixture is specifically designed for use with reaction-bonded silicon nitride, having a closely-matched coefficient of thermal expansion, but may be useful with other ceramic materials.
In this specification and the claims, the use of chemical names is not intended to exclude the possibility of minor impurities so that, for example, alumina may contain small percentages of sodium monoxide, calcium oxide etc.
In a glazing mixture in accordance with the invention said balance may also comprise of up to 45% by weight of titanium oxide. For example, there may be between 40 and 45% by weight of titanium dioxide in said balance. Other metal oxides, such as cobalt oxide, may be added to said balance, instead of or in addition to titanium dioxide.
Preferably, the silica forms 30 to 40% by weight of the powder and the alumina forms 25 to 35% by weight of said powder.
Preferably the manganese dioxide forms 15 to 30% by weight of said balance.
The invention also provides a method of forming a vitreous glaze on a surface of an article made of ceramic material, the method comprising forming a glazing mixture, applying said glazing mixture to said surface, and firing at a temperature from 1200 degrees centigrade to 1300 degrees centigrade, the glazing mixture comprising a powder in a suitable binder, wherein the power comprises:
15 to 40% by weight of silica,
10 to 35% by weight of alumina,
and a balance comprising manganese dioxide and ferric
oxide, the manganese dioxide forming 15 to 80% by
weight of said balance.
The ceramic material may, for example, be reactionbonded silicon nitride.
There now follows a detailed description of an example which is illustrative of the invention.
In the illustrative example, a glazing mixture was prepared comprising a powder in a suitable binder, specifically the binder comprised 5% by weight of ethyl cellulose powder dissolved in 95% by weight of 2-Ethoxyethanol. The powder comprised 25% by weight of alumina, 35% by weight of silica and a balance, ie 40% by weight of the total, comprising 25% by weight manganese dioxide and 75% by weight ferric oxide. These ingredients were prepared as a slurry obtained by ball milling the powder for 16 hours with
Isopropylalcohol and sintered silicon nitride acting as a grinding medium. The slurry was then dried at a temperature between 100-150 degrees centigrade and the resulting solid material was passed through a 250 micrometre sieve.
The powder obtained was stirred into the binder to provide a required mixture to be applied to a ceramic material. The stirring was done using a magnetic stirrer on a hot plate. The relative proportions of the powder and of the binder were pre-determined to be suitable for application to reaction-bonded silicon nitride. The glazing mixture so formed was brushed on to a piece of reaction-bonded silicon nitride which was then fired at a temperature between 1200 and 1350 degrees centigrade in air. The temperature was raised at 75 degrees centigrade per hour until a temperature of 500 degrees centigrade was achieved. The temperature of 500 degrees centigrade was maintained for half an hour and then the temperature was raised at 600 degrees centigrade per hour until 1300 degrees centigrade was reached. The temperature of 1300 degrees centigrade was maintained for two hours and then cooling at 600 degrees centigrade per hour was applied until 1200 degrees centigrade was achieved and then maintained for two hours. The reaction-bonded silicon nitride was then allowed to cool in the furnace. The reaction-bonded silicon nitride was found to have vitreous glaze on the surface thereof which was found to enable the material to be exposed to temperatures greater than 1000 degrees centigrade for prolonged periods in the presence of corrosive gases without substantial damage to the material.
Claims (1)
1 A glazing mixture comprising a powder in a suitable
binder, wherein the powder comprises:
15 to 40% by weight of silica,
10 to 35% by weight of alumina, and
a balance comprising manganese dioxide and ferric
oxide, the manganese dioxide forming 15 to 80% by
weight of said balance.
2 A glazing mixture according to claim 1, wherein said
balance also comprises up to 45% by weight of titanium
dioxide.
3 A glazing mixture according to either of claims 1 and
2, wherein the silica forms 30 to 40% by weight of the
powder.
4 A glazing mixture according to any one of claims 1 to
3, wherein the alumina forms 25 to 35% by weight of
the powder.
5 A glazing mixture according to any one of claims 1 to
4, wherein the manganese dioxide forms 15 to 30% by
weight of said balance.
6 A glazing mixture substantially as hereinbefore
described with reference to the illustrative example.
7 A method of forming a vitreous glaze on a surface of
an article made of ceramic material, the method
comprising forming a glazing mixture, applying said
glazing mixture to said surface, and firing at a
temperature of from 1200 degrees centigrade to 1350
degrees centigrade, the glazing mixture comprising a
powder in a suitable binder, wherein the powder
comprises:
15 to 40% by weight of silica,
10 to 35% by weight of alumina,
and a balance comprising manganese dioxide and
ferric oxide, the manganese dioxide forming 15 to
80% by weight of said balance.
8 A method according to claim 7, wherein the ceramic
material is reaction-bonded silicon nitride.
9 A method according to either one of claims 7 and 8,
wherein a glazing mixture according to any one of
claims 1 to 6 is used.
10 A method of forming a vitreous glaze substantially as
hereinbefore described with reference to the
illustrative example.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9405586A GB2287933A (en) | 1994-03-22 | 1994-03-22 | Glazing ceramic materials |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9405586A GB2287933A (en) | 1994-03-22 | 1994-03-22 | Glazing ceramic materials |
Publications (2)
Publication Number | Publication Date |
---|---|
GB9405586D0 GB9405586D0 (en) | 1994-05-11 |
GB2287933A true GB2287933A (en) | 1995-10-04 |
Family
ID=10752259
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9405586A Withdrawn GB2287933A (en) | 1994-03-22 | 1994-03-22 | Glazing ceramic materials |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2287933A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1130006A1 (en) | 2000-02-24 | 2001-09-05 | Wacker-Chemie GmbH | Coated silicon nitride article |
RU2455266C1 (en) * | 2011-03-21 | 2012-07-10 | Юлия Алексеевна Щепочкина | Brick glaze |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SU1682334A1 (en) * | 1989-11-09 | 1991-10-07 | Грузинский политехнический институт | Glaze |
-
1994
- 1994-03-22 GB GB9405586A patent/GB2287933A/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SU1682334A1 (en) * | 1989-11-09 | 1991-10-07 | Грузинский политехнический институт | Glaze |
Non-Patent Citations (1)
Title |
---|
Derwent WPI Abstract 92-232554/28 & SU 1682334 A1 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1130006A1 (en) | 2000-02-24 | 2001-09-05 | Wacker-Chemie GmbH | Coated silicon nitride article |
DE10008646A1 (en) * | 2000-02-24 | 2001-09-13 | Kempten Elektroschmelz Gmbh | Molded body used as a cooking plate comprises an adhesion- and scratch-resistant surface coating made of glass and/or glass-ceramic formed on hot-pressed, gas pressure-sintered , reaction-bound or hot isostatically pressed silicon nitride |
RU2455266C1 (en) * | 2011-03-21 | 2012-07-10 | Юлия Алексеевна Щепочкина | Brick glaze |
Also Published As
Publication number | Publication date |
---|---|
GB9405586D0 (en) | 1994-05-11 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |