GB954298A - Improvements in or relating to the production of ceramic materials - Google Patents
Improvements in or relating to the production of ceramic materialsInfo
- Publication number
- GB954298A GB954298A GB42188/59A GB4218859A GB954298A GB 954298 A GB954298 A GB 954298A GB 42188/59 A GB42188/59 A GB 42188/59A GB 4218859 A GB4218859 A GB 4218859A GB 954298 A GB954298 A GB 954298A
- Authority
- GB
- United Kingdom
- Prior art keywords
- alumina
- chromic oxide
- solid solution
- colour
- mixture
- 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.)
- Expired
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
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
-
- 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
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
-
- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
A method of indicating whether a required transistion from the gamma form to the alpha form of an alumina material has taken place comprises adding up to 20 molecular percentage of chromic oxide to form a solid solution such that on subsequent heat treatment the mixture has a first colour (pink) when in the alpha form and another colour (green) when in the gamma form. Preferably the chromic oxide is added by mixing in powder form alumina and chromic oxide, the mixture is then fired above 1200 DEG C. to produce a solid solution which is then powdered and a refractory body is formed by flame spraying the powdered material in the form of molten particles on to a base or former and this body is pink when the alumina is in the alpha form and green when in the gamma form. Specification 903,709 is referred to.ALSO:A composite pigment comprising alumina and up to 20 molecular percentage of chromic oxide is prepared by forming a solid solution of the alumina and chromic oxide such that on subsequent heat treatment the mixture has a first colour when the alumina is in the alpha form and a second colour when it is in the gamma form. Preferably the chromic oxide is added by mixing in powder form alumina and chromic oxide, the mixture is then fired above 1200 DEG C. to produce a solid solution which is then powdered and a refractory body is formed by flame spraying the powdered material, in the form of molten particles, on to a base or former and this body is pink when the alumina is in the alpha form and green when in the gamma form. Specification 903,709 is referred to.ALSO:A refractory body is formed by flame-spraying on to a base or former a solid solution which has been formed by adding up to 20 molecules percentage of chromic oxide to an alumina material, the solid solution on subsequent heat treatment having a first colour, pink, when the alumina is in the alpha form and a second colour, green, when the alumina is in the gamma form. Preferably the chromic oxide is added by mixing in powder form alumina and chromic oxide, then firing the mixture above 1200 DEG C. to produce a solid solution which is then powdered and the refractory body is then formed by flame spraying the powdered material in the form of molten particles on to a base or former. Specification 903,709 is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB42188/59A GB954298A (en) | 1959-12-11 | 1959-12-11 | Improvements in or relating to the production of ceramic materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB42188/59A GB954298A (en) | 1959-12-11 | 1959-12-11 | Improvements in or relating to the production of ceramic materials |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB954298A true GB954298A (en) | 1964-04-02 |
Family
ID=10423229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB42188/59A Expired GB954298A (en) | 1959-12-11 | 1959-12-11 | Improvements in or relating to the production of ceramic materials |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB954298A (en) |
-
1959
- 1959-12-11 GB GB42188/59A patent/GB954298A/en not_active Expired
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