GB499972A - Improvements in refractory materials - Google Patents
Improvements in refractory materialsInfo
- Publication number
- GB499972A GB499972A GB22212/37A GB2221237A GB499972A GB 499972 A GB499972 A GB 499972A GB 22212/37 A GB22212/37 A GB 22212/37A GB 2221237 A GB2221237 A GB 2221237A GB 499972 A GB499972 A GB 499972A
- Authority
- GB
- United Kingdom
- Prior art keywords
- substance
- sand
- tridymite
- expansion
- heating
- 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
- C04B35/01—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
- C04B35/14—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 silica
Abstract
Refractory moulds for casting metals are formed from an aqueous mixture containing sand, a water-soluble compound of silica, e.g. sodium silicate, as binding agent, and a substance which precipitates a silicon compound from an aqueous solution of the binding agent, and are expanded before use in casting by heating to a temperature at which quartz present in the sand is converted to tridymite. The addition of the precipitating substance, which may be a metal or metalloid oxide or oxyhydrate, e.g. calcium oxide, allows the conversion of quartz to tridymite and the expansion of the mould (which is necessary in order to compensate for the shrinkage of the metal subsequently cast therein) to proceed at a lower temperature, i.e. 900 C. instead of 1200-1300 C. The expansion may be reduced, if required, by replacing some of the sand by a substance which will not expand during the heating, e.g. burnt clay.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE499972X | 1936-12-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB499972A true GB499972A (en) | 1939-02-01 |
Family
ID=6545546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB22212/37A Expired GB499972A (en) | 1936-12-23 | 1937-08-12 | Improvements in refractory materials |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB499972A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE975915C (en) * | 1946-02-13 | 1962-12-06 | Nicolas Herzmark | Process for the production of refractory casting molds for the precision casting of metals and metal alloys |
-
1937
- 1937-08-12 GB GB22212/37A patent/GB499972A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE975915C (en) * | 1946-02-13 | 1962-12-06 | Nicolas Herzmark | Process for the production of refractory casting molds for the precision casting of metals and metal alloys |
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